Is the Moldex 7740 P100 the right particulate filter for your dust and fume work?

Short answer: Yes — if you are using a Moldex 7000, 7800, or 9000 series respirator and your hazard is particulate-only (lead dust, silica, welding fume, asbestos, pharmaceutical powder, or woodworking dust), the Moldex 7740 is a clean fit. It carries the highest NIOSH particulate rating (P100, ≥99.97% filtration) and the P-class oil-proof designation, meaning it handles oil-based mists and aerosols without degrading. If your job also involves gases or vapors, you will need to pair a gas cartridge with this filter or step up to a combination cartridge. Keep reading for a full breakdown of what the 7740 does, where it stops, and how it stacks up against competing options.

Moldex 7740 P100 Particulate Filter Review (2026)

The P100 designation is the gold standard in NIOSH particulate filtration. Under 42 CFR Part 84, a P100 filter must capture at least 99.97% of airborne particles across the most penetrating particle size range, and the "P" prefix specifically means the filter medium is oil-proof — it retains full efficiency even when exposed to oil-based aerosols, cutting fluids, or mists that would degrade an N-class (not oil-resistant) or R-class (single-shift oil-resistant) filter. P100 filters are required or strongly recommended by OSHA and NIOSH for the most hazardous particulate exposures: lead abatement, asbestos, silica-generating tasks, certain welding fumes, radionuclide aerosols, and pharmaceutical manufacturing environments.

Within Moldex's filter and cartridge lineup, the 7740 is the baseline P100 mechanical particulate filter. It threads into the proprietary bayonet mount shared by every Moldex half-mask (7000 series: 7001/7002/7003) and full-face respirator (9000 series: 9001/9002/9003), as well as the 7800 series. It is sold as a pair at approximately $21.19, which is on par with its nearest competitors. The 7740 is a workhorse filter: no frills, no combination chemistry, just reliable NIOSH-certified P100 mechanical filtration. Contractors who work lead paint remediation, industrial maintenance crews managing silica dust, and welders looking for high-efficiency fume control all reach for the 7740 as their standard cartridge.

This review covers the 7740's performance characteristics, its place in the Moldex filter family, head-to-head comparisons with 3M equivalents, and the specific job-site scenarios where it belongs — and where it does not.

Who Should Buy the Moldex 7740

• Lead abatement contractors who need NIOSH P100 and EPA/OSHA compliance on renovation and demolition projects involving lead-based paint.
• Silica-exposure trades — concrete cutting, sandblasting, tuckpointing, masonry — where OSHA 1926.1153 / 1910.1053 requires engineering controls supplemented by P100 respirator protection.
• Welders and metal fabricators dealing with fumes containing hexavalent chromium, manganese, or other IDLH-adjacent particulates.
• Woodworking and cabinet shops where fine hardwood dust presents both carcinogen (IARC Group 1) and nuisance exposure concerns.
• Pharmaceutical and lab environments handling potent powder compounds, where P100 filtration is specified in the exposure control plan.
• Asbestos abatement workers operating under OSHA 29 CFR 1926.1101 and EPA NESHAP standards requiring half-mask or better with P100 filtration for Class III/IV work.
• Existing Moldex platform users on the 7000/7800/9000 series who want maximum particulate protection without adding gas cartridge chemistry they do not need.
• Workers in oil mist environments — metalworking coolant mist, hydraulic fluid aerosols — where the P-class oil-proof rating is required and N-class filters are disqualified.

What the Moldex 7740 Does Well

P100 is the Highest NIOSH Particulate Certification

NIOSH certifies particulate filters under 42 CFR Part 84 on two axes: oil resistance (N/R/P class) and minimum filtration efficiency (95%, 99%, 99.97%). The P100 rating combines the oil-proof class with 99.97% minimum efficiency — the highest available under the standard. In practical terms, for every 10,000 particles in the challenge aerosol used in NIOSH testing, no more than 3 penetrate the filter. This efficiency level is what OSHA requires for the most hazardous exposures — crystalline silica at TWA levels above the PEL with inadequate engineering controls, lead abatement, asbestos fiber removal, and radionuclide aerosol exposure per 10 CFR 20.

Workers on the 7740 benefit from a substantial protection margin over N95 respirators, which are rated at only ≥95% efficiency and carry no oil-resistance designation. That extra margin matters when you are working in environments where a single exposure event carries long-term health consequences, such as lead dust ingestion during demolition of pre-1978 housing stock or crystalline silica inhalation during dry concrete cutting.

P-Class Oil-Proof Rating — Required for Many Industrial Environments

The P-class designation is not an upgrade over N-class — it is a qualification for different hazards. NIOSH testing for P100 filters uses a dioctyl phthalate (DOP) or equivalent oil-based aerosol as the challenge agent. N-class filters are tested with a sodium chloride aerosol only and are explicitly not rated for oil mist environments. R-class filters carry an oil-resistance rating but are limited to a single work shift (8 hours) before the efficiency degrades below the rated threshold.

For metalworking operations using coolant mist, hydraulic fluid maintenance, oil-based mold-release sprays in manufacturing, or any other environment where oil aerosols are present alongside particulate hazards, the 7740's P-class rating means the filter remains effective across extended use periods without the efficiency loss that would occur with an N-class equivalent. See our reference guide on respirator filter types for a full breakdown of the N/R/P class system and how to select the right class for your work environment.

Designed for the Moldex Bayonet Platform — Tool-Free Swap

Moldex uses a proprietary bayonet-style mount that is consistent across the 7000 half-mask series (7001/7002/7003), the 7800 half-mask series, and the 9000 full-face series (9001/9002/9003). The 7740 snaps on and off without tools — a significant advantage in high-turnover industrial environments where workers are changing from particulate-only filters to combination cartridges as they move between work zones. The bayonet alignment is tactile and audible, making it straightforward to confirm the filter is properly seated even when wearing gloves.

Platform consistency also matters for compliance programs: a site that standardizes on Moldex respirators can stock a single filter SKU (the 7740) across multiple facepiece sizes without managing separate filter inventories per respirator model. Browse the full Moldex cartridges and filters collection for the complete lineup of compatible attachments.

Low Breathing Resistance for Extended Wear

One of the practical barriers to P100 adoption in some workplaces is breathing resistance. High-efficiency filters necessarily impose more inhalation effort than lower-rated alternatives, and in physically demanding jobs — welding, masonry, demolition — workers sometimes remove or improperly wear respirators because the added exertion becomes fatiguing over a full shift. Moldex has consistently addressed this in their filter design through the use of an electrostatically enhanced filter medium (in the base 7740 as well as the 7740+ IonicAir variant) that achieves high efficiency at a lower pressure drop than purely mechanical filtration alone. The result is a filter that meets P100 certification while remaining tolerable for extended continuous wear in physical labor contexts.

Built for the Highest-Hazard Particulate Applications

The 7740 is explicitly suited to the regulated substances that drive most industrial hygiene programs. For lead exposure under OSHA 1910.1025 (general industry) and 1926.62 (construction), P100 half-mask provides an APF of 10 — meaning it can be used when airborne lead concentrations are up to 10 times the PEL (50 µg/m³), i.e., up to 500 µg/m³. When paired with the Moldex 9000 full-face respirator, the APF increases to 50, covering environments up to 2,500 µg/m³. For silica-generating tasks, P100 filtration captures respirable crystalline silica (particle size below 4 µm) with ≥99.97% efficiency, supporting compliance with OSHA's silica PEL of 50 µg/m³ TWA where engineering controls alone are insufficient. For additional guidance on selecting the right filter for mold-adjacent renovation work with potential silica exposure, see our best cartridge for mold remediation guide.

Where the Moldex 7740 Falls Short

No Gas or Vapor Protection — Particulate Only

The 7740 contains no sorbent bed, no activated carbon layer, and no acid gas granules. It does not provide any protection against organic vapors, acid gases (hydrogen chloride, hydrogen fluoride, chlorine), ammonia, or any other gaseous chemical hazard. If your work environment involves both particulate and chemical vapor hazards — for example, welding operations where both fume particulates and decomposition gases are present, or spray painting where both overspray particles and solvent vapors exist — the 7740 alone is insufficient.

In those dual-hazard environments, you need either a combination cartridge such as the Moldex 7367 OV/AG P100 combo cartridge, the 7467 for ammonia environments, or the 7667 multi-gas P100 smart cartridge. A separate gas cartridge stacked with the 7740 is another option on some Moldex facepieces, but the combination cartridges are more streamlined. This limitation is the primary reason the 7740 does not score a perfect 5 in this review — many real-world particulate tasks also involve incidental vapor exposure that the 7740 cannot address. For a deeper look at when to add vapor coverage, see our organic vapor vs. P100 reference guide and the cartridge selection guide.

The 7740+ IonicAir Has an Edge for Ultrafine Particles

Moldex offers the 7740+ IonicAir at the same price point (~$21.19/pair). The IonicAir variant adds an electrostatic charge layer on top of the standard mechanical P100 filter medium, providing enhanced capture efficiency for ultrafine particles — those below 0.1 µm — including laser ablation fumes, metal nanoparticles, and certain pharmaceutical aerosols. Both cartridges meet and exceed the NIOSH P100 99.97% threshold; the difference only becomes meaningful at the nanoscale fringe where the standard mechanical filter's efficiency begins to approach its theoretical minimum.

For conventional construction and industrial dust (silica, lead, asbestos, wood dust, welding fume), the standard 7740 mechanical filtration is fully adequate and the IonicAir premium provides no practical benefit. For laser operators, semiconductor fab workers, or pharmaceutical synthesis environments where submicron particle generation is a design condition, the 7740+ is the better choice at no additional cost. There is no reason to buy the standard 7740 over the IonicAir in those specific environments.

Moldex Bayonet Mount — Platform Lock-In

The Moldex bayonet mount is not compatible with 3M, MSA, Honeywell North, Sperian, or any other manufacturer's facepieces. Workers and safety buyers who maintain a mixed fleet of respirators from multiple manufacturers cannot use the 7740 across that fleet. If your site uses 3M 2091 or 3M 7093 compatible respirators alongside Moldex, the 7740 cannot be stocked as a universal filter. This is not a product deficiency per se — all bayonet-mount systems are proprietary — but it is a procurement constraint that buyers managing multi-platform programs should account for.

Moldex 7740 vs 3M 2091 vs 3M 7093 — P100 Filter Comparison

The three most commonly specified P100 filters in North American industrial hygiene programs are the Moldex 7740, the 3M 2091, and the 3M 7093. All three hold NIOSH P100 certification under 42 CFR Part 84. The primary distinctions are platform compatibility, form factor, and any combination chemistry.

Takeaway: At the P100 particulate-only level, the Moldex 7740 and 3M 2091 are functionally equivalent in NIOSH-rated performance. Both are P100 oil-proof disk filters for their respective half-mask platforms. The 3M 7093 is physically larger (cartridge form factor) and designed for the same 3M platform. If you are already on the Moldex platform, the 7740 is the correct choice. If you are evaluating platforms from scratch, both Moldex and 3M offer solid P100 filter ecosystems — the decision typically comes down to facepiece fit, comfort, and the availability of specific combination cartridges for your vapor hazards. See the full respirator filters and cartridges collection for additional options.

Moldex Particulate Filter Options — 7740 vs 7740+ vs 7760

Within the Moldex filter family, three P100-class products address particulate protection with different feature profiles. Understanding the distinctions allows buyers to match filter choice to job hazard without overpaying for capabilities they do not need.

Decision rules:

• If your hazard is standard industrial particulate (lead, silica, wood dust, welding fume, asbestos) with no nanoscale concern: 7740 is sufficient.
• If your hazard includes laser fumes, metal nanoparticles, pharmaceutical submicron powder, or semiconductor aerosols: choose 7740+ IonicAir at the same price.
• If you want incidental odor comfort alongside P100 particulate protection but do not have a rated vapor hazard requiring a full combination cartridge: consider 7760 — but understand it does not replace a rated gas cartridge for actual vapor exposures.
• If you have both particulate AND gas/vapor hazards: use a combination cartridge (7367 OV/AG P100, 7667 multi-gas P100) instead of a standalone particulate filter.

Compatible Respirators for the Moldex 7740

The Moldex 7740 is certified for use with all Moldex half-mask and full-face respirators that accept the Moldex bayonet cartridge mount. Compatibility is consistent across facepiece sizes (Small/Medium/Large) within each series. The 7740 is not compatible with any non-Moldex respirator platform.

• Moldex 7001 / 7002 / 7003 — 7000 series half-mask (Small/Medium/Large). APF 10 with P100.
• Moldex 7800 series half-mask — 7800 series half-mask with valved design. APF 10 with P100. Part of the Moldex half-mask collection.
• Moldex 9001 / 9002 / 9003 — 9000 series full-face respirator (Small/Medium/Large). APF 50 with P100 — covers environments up to 50x the PEL. Part of the Moldex full-face respirators collection.

For programs that require higher protection factors — IDLH-adjacent environments, asbestos abatement requiring full-face per OSHA 1926.1101, or lead concentrations above 500 µg/m³ — the 9000 full-face with 7740 filters (APF 50) is the correct combination. Browse the complete Moldex P100 respirators collection for available configurations.

Category Context: P100 vs N95, N100, R95 — and When P100 Is Required

The NIOSH Filter Rating System

NIOSH certifies filtering facepiece respirators and cartridge/filter combinations under three oil-resistance classes:

• N-class: Not oil-resistant. Tested with NaCl aerosol only. Suitable for non-oil environments. N95 (≥95%), N99 (≥99%), N100 (≥99.97%).
• R-class: Oil-resistant for a single work shift. R95 (≥95%), R99 (≥99%), R100 (≥99.97%).
• P-class: Oil-proof. Tested with oil-based aerosol. Suitable for extended use in oil-mist environments. P95 (≥95%), P99 (≥99%), P100 (≥99.97%).

In numeric filtration efficiency terms, N100, R100, and P100 are all ≥99.97%. The difference is oil resistance class. For environments free of oil aerosols, an N100 filter is technically equivalent in filtration efficiency to a P100. However, many industrial hygiene programs default to P100 across all applications to avoid the burden of assessing whether oil aerosols are present, since the cost difference between N100 and P100 equivalents is minimal. See our filter types reference guide for a complete treatment of the rating system.

P100 vs HEPA — Are They the Same?

HEPA (High-Efficiency Particulate Air) is an air-filtration standard for HVAC and air-purification equipment rated at ≥99.97% capture of 0.3 µm particles — numerically the same threshold as NIOSH P100. However, HEPA is not a NIOSH certification class; it is a performance standard applied to fixed air-handling equipment, not to personal respiratory protection. NIOSH P100 filters are the correct respirator certification for occupational inhalation hazard control. Do not substitute HEPA-filter masks that lack NIOSH 42 CFR Part 84 approval for occupational P100 applications.

When Is P100 Required vs. When Is N95 Sufficient?

N95 respirators are appropriate for many general dust and non-regulated particulate tasks. P100 filtration is required or strongly recommended in the following scenarios:

• Lead exposure above the action level (30 µg/m³) where OSHA 1910.1025/1926.62 mandates at minimum a half-mask with P100
• Asbestos removal under OSHA 1926.1101 Class I/II/III operations above 1 f/cc
• Crystalline silica exposure where engineering controls cannot reduce to below the OSHA PEL (50 µg/m³)
• Radionuclide aerosols per NRC/DOE regulations
• Environments with oil-based aerosols where N-class filters are explicitly disqualified
• Any operation where an industrial hygienist has specified P100 in the written respiratory protection program per OSHA 1910.134

For fiberglass insulation work, the regulatory threshold is lower and N95 is often sufficient; see our fiberglass respirator guide for specifics. For other cartridge and filter selection questions, see how to choose a respirator cartridge.

Total Cost of Ownership: Filter Lifespan and Replacement Triggers

At approximately $21.19 per pair, the Moldex 7740 is one of the more economical P100 filter options per pair. Understanding when to replace filters is as important as the initial purchase cost for accurate TCO calculation.

Replacement Triggers by Application

• Breathing resistance increase: The primary replacement indicator for P100 particulate filters is increased breathing resistance. As particulate loads the filter medium, airflow restriction increases. When breathing effort during normal work activity becomes noticeably elevated, replace the filter pair. There is no specific hour or day threshold — it is load-dependent.
• Physical damage: Any crack, puncture, or damage to the filter housing or sealing gasket necessitates immediate replacement. A damaged filter cannot maintain the rated seal or efficiency.
• Contamination by hazardous material: In lead abatement or asbestos operations, filters that have accumulated visible contamination should be treated as hazardous waste and disposed of per the applicable OSHA/EPA standard. Do not remove contaminated filters without gloves and do not blow out or shake filters to extend their life.
• Oil-mist environments (P-class advantage): In oil aerosol environments, P100 filters maintain efficiency indefinitely until breathing resistance increases — unlike R-class filters, which are limited to a single shift. This extended service life is a direct TCO advantage of P-class over R-class in metalworking or machining environments.
• Storage: Unused filters should be stored in their original packaging away from chemical vapors, humidity, and direct sunlight. Filters stored in contaminated environments or exposed to solvents may be degraded even if visually intact.
• End-of-day removal vs. overnight storage: OSHA's respiratory protection standard (1910.134) allows filters stored in a sealed bag between shifts when the work environment is controlled and the filter is not contaminated. For contaminated or regulated substance applications (lead, asbestos), consult your written respiratory protection program for specific handling protocols.

A single pair of 7740 filters typically serves one worker across multiple shifts in moderate dust environments before breathing resistance becomes a replacement trigger. In heavy particulate loading (abrasive blasting, high-dust demolition), replacement may be required daily. For a 5-person crew on a 30-day lead abatement project with moderate-to-heavy dust, budget 1–2 pairs per worker per week as a planning baseline, adjusting based on observed breathing resistance during work.

Final Verdict

The Moldex 7740 earns a 4.4 out of 5 rating as a NIOSH P100 particulate filter for Moldex platform users. It delivers the highest NIOSH particulate efficiency class (≥99.97%), carries the P-class oil-proof designation required for oil-mist environments, and provides tool-free bayonet compatibility with the full Moldex 7000/7800/9000 respirator lineup. For the regulated particulate hazards that drive most industrial hygiene programs — lead, crystalline silica, asbestos, welding fume, pharmaceutical powder — the 7740 is a clean, reliable, well-priced choice.

The score is not a 5 because the 7740+ IonicAir provides enhanced ultrafine-particle capture at the same price in nanoparticle environments, and because the absence of any vapor protection layer means dual-hazard environments require a combination cartridge upgrade. Neither limitation is a flaw — they are design parameters. Buyers who understand those parameters and whose work falls within the 7740's strengths will not be disappointed.

For Moldex platform users with conventional industrial particulate exposures, the 7740 is the default correct choice. Browse the full Moldex P100 respirators collection and the Moldex cartridges and filters collection for compatible accessories.

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Frequently Asked Questions

Is the Moldex 7740 a true P100 filter certified by NIOSH?

Yes. The Moldex 7740 is NIOSH-approved as a P100 particulate filter under 42 CFR Part 84. This means it has been independently tested by NIOSH and confirmed to capture at least 99.97% of airborne particles, including oil-based aerosols. The NIOSH approval number is printed on the filter packaging. Never use a respirator filter that lacks a NIOSH approval number for occupational hazard exposures — unapproved filters sold as "P100 equivalent" or "HEPA grade" do not carry regulatory standing under OSHA 1910.134.

What respirators is the Moldex 7740 compatible with?

The Moldex 7740 is compatible with all Moldex respirators that use the Moldex proprietary bayonet cartridge mount. This includes the Moldex 7000 series half-mask (7001/7002/7003), the Moldex 7800 series half-mask, and the Moldex 9000 series full-face respirator (9001/9002/9003). The 7740 is not compatible with 3M, MSA, Honeywell, or any other manufacturer's respirator platform.

Does the Moldex 7740 protect against organic vapors or acid gases?

No. The Moldex 7740 is a particulate-only filter with no sorbent media, activated carbon, or acid gas granules. It provides zero protection against organic vapors, acid gases, ammonia, or any other gaseous chemical hazard. If your task involves both particulate and vapor hazards, you need a combination cartridge such as the Moldex 7367 OV/AG P100 combo or the Moldex 7667 multi-gas P100 smart cartridge. See our organic vapor vs. P100 guide for guidance on identifying dual-hazard situations.

What is the difference between the Moldex 7740 and the Moldex 7740+ IonicAir?

Both the 7740 and the 7740+ IonicAir are NIOSH P100-certified and priced at approximately $21.19/pair. The IonicAir variant adds an electrostatic charge layer that enhances capture efficiency for ultrafine particles below 0.1 µm — relevant for laser ablation fumes, metal nanoparticles, and pharmaceutical submicron aerosols. For conventional industrial dust including lead, silica, asbestos, and standard welding fume, both filters provide equivalent NIOSH-rated protection and the 7740 standard is sufficient. If your environment generates nanoparticles or laser fumes, choose the 7740+ at no additional cost.

What is the difference between the Moldex 7740 and the Moldex 7760?

The Moldex 7760 is a P100 filter that includes a nuisance-level organic vapor and acid gas odor relief layer. This layer provides comfort by reducing incidental chemical odors but is not a NIOSH-rated gas protection cartridge — it does not replace the need for a combination cartridge when actual OV/AG exposure hazards exist. The 7740 is pure mechanical P100 filtration with no odor relief layer. For environments where incidental odors are a comfort issue but no rated vapor hazard is present, the 7760 offers a quality-of-life advantage. For rated vapor protection, use a combination cartridge.

Can the Moldex 7740 be used for lead abatement work?

Yes. The Moldex 7740 is appropriate for lead abatement work under OSHA 29 CFR 1910.1025 (general industry) and 1926.62 (construction). When used with a Moldex half-mask, the assigned protection factor (APF) is 10, covering airborne lead concentrations up to 10x the PEL (500 µg/m³). When used with the Moldex 9000 full-face, the APF increases to 50, covering concentrations up to 2,500 µg/m³. Your written respiratory protection program must specify the appropriate respirator level based on the measured or anticipated airborne concentration.

Is the Moldex 7740 suitable for silica dust control?

Yes. P100 filtration captures respirable crystalline silica (particle sizes below 4 µm) at ≥99.97% efficiency, which is the appropriate filtration level for silica-generating operations such as concrete cutting, sandblasting, tuckpointing, and masonry under OSHA's silica standards (1926.1153 for construction, 1910.1053 for general industry). The Moldex 7740 meets the P100 requirement specified in many OSHA silica control methods for use as respiratory protection when engineering controls alone cannot maintain exposures below the PEL of 50 µg/m³ TWA.

How long do Moldex 7740 filters last before they need to be replaced?

Filter replacement for the 7740 is triggered by increased breathing resistance rather than a fixed time interval. As particulate loads the filter medium, airflow restriction increases. When breathing effort during normal work becomes noticeably elevated, replace the filter pair. In light-to-moderate dust environments, a pair may last multiple shifts or weeks. In heavy loading environments (abrasive blasting, high-volume demolition), daily replacement may be warranted. Physical damage, visible contamination with regulated substances (lead, asbestos), and exposure to chemical vapors or solvents during storage are also immediate replacement triggers. Do not blow out or clean filters to extend service life.

Does P100 mean the same as HEPA?

The numeric filtration threshold is the same — both HEPA and NIOSH P100 require ≥99.97% capture of 0.3 µm particles — but they are not interchangeable certifications. HEPA is an air-purification equipment standard applied to HVAC filters and air purifiers, not to personal respiratory protection. NIOSH P100 is the occupational safety certification under 42 CFR Part 84 that must appear on respirator filters used for workplace hazard control under OSHA 1910.134. Do not use HEPA-labeled respirator masks that lack a NIOSH approval number for regulated occupational exposures.

What is the assigned protection factor (APF) for the Moldex 7740?

The APF is determined by the facepiece, not the filter. When the 7740 is used with a half-mask respirator (such as the Moldex 7000 series), the APF is 10 per OSHA Table 1 to 1910.134. This means the half-mask/P100 combination can be used when airborne concentrations are up to 10x the applicable PEL. When the 7740 is used with a full-face respirator (such as the Moldex 9000 series), the APF is 50, covering concentrations up to 50x the PEL. APF selection must be matched to measured or anticipated airborne concentrations in your written respiratory protection program.

Can the Moldex 7740 be used in asbestos abatement?

Yes. OSHA 29 CFR 1926.1101 specifies minimum respirator requirements for asbestos work by class and fiber concentration. P100 half-mask (APF 10) is the minimum for Class III and IV operations within the regulated area; P100 full-face (APF 50) is required for Class I/II operations above 1 f/cc. The Moldex 7740 meets the P100 filtration requirement when properly fitted on a Moldex respirator with an APF matched to the measured asbestos concentration. Consult your written respiratory protection program and industrial hygienist for specific requirements on your project.

Is the Moldex 7740 rated for oil mists and oil-based aerosols?

Yes. The "P" in P100 stands for oil-proof. NIOSH tests P-class filters using an oil-based challenge aerosol (dioctyl phthalate or equivalent) and certifies that the filter maintains ≥99.97% efficiency under oil-mist conditions. N-class filters are explicitly not rated for oil environments, and R-class filters are limited to a single shift before efficiency degrades. The Moldex 7740 is appropriate for metalworking coolant mist, hydraulic fluid maintenance, oil-based spray operations, and any other environment where oil-based aerosols are present alongside particulate hazards.

What is the difference between the Moldex 7740 and the 7367 combination cartridge?

The Moldex 7367 is a combination cartridge that integrates both an organic vapor/acid gas sorbent bed and a P100 particulate filter in a single unit. The 7740 is a standalone P100 particulate filter with no vapor or gas protection. The 7367 is the appropriate choice when your hazard analysis identifies both particulate and OV/AG vapor exposure — spray painting with solvent-based coatings, chemical processing environments, or industrial cleaning operations. The 7740 is the appropriate choice when particulate is the sole hazard and no vapor protection is warranted. Using a 7740 alone in an environment that requires OV/AG protection provides false security for the vapor component of the hazard.

How does the Moldex 7740 compare to the 3M 2091 P100 filter?

Both the Moldex 7740 and the 3M 2091 are NIOSH P100-certified, oil-proof disk-format filters for their respective half-mask platforms. In NIOSH-rated filtration performance, they are equivalent — both meet ≥99.97% efficiency with P-class oil resistance. The 3M 2091 is designed for 3M 6000/7000/FF-400 series respirators and is not compatible with Moldex facepieces. The Moldex 7740 is designed exclusively for Moldex bayonet-mount respirators. Filter choice is therefore determined primarily by which facepiece platform your program uses, not by performance differentiation between the filters themselves. For 3M platform users, see the 3M 2091 product page.

Where can I buy the Moldex 7740 P100 filter?

The Moldex 7740 is available from WC Safety at /products/moldex-7740-p100-particulate-filter-respirator, with the full Moldex cartridge lineup available in the Moldex cartridges and filters collection. It is also available from third-party sellers on Amazon. WC Safety stocks the complete Moldex 7000/9000 series platform including compatible half-masks and full-face respirators. For bulk procurement or B2B program pricing, contact WC Safety directly.