Moldex 7740 P100 Particulate Filter Respirator

Moldex 7740 Overview

The Moldex 7740 is a NIOSH-approved P100 particulate filter sold as a pair (2 filters per bag) that mounts on Moldex 7000, 7800, and 9000 series respirators to capture at least 99.97% of airborne particles, including oil-based aerosols. Priced at $21.19 per pair, the 7740 is the baseline choice when particulate control — dust, fumes, mists, metal particulates, and biological aerosols — is the only hazard on the job. It provides zero gas or vapor protection; pair it with a compatible combo cartridge or upgrade to a 7367 OV/AG/P100 combo when chemical hazards are also present.

Affiliate disclosure: WC Safety earns a commission on qualifying Amazon purchases at no extra cost to you.

Where the Moldex 7740 Fits in Respirator Selection

Respirator cartridge selection begins with hazard identification — not filter color or brand preference. The Moldex 7740 belongs in the "particulate-only" column of any hazard assessment. If your air monitoring confirms airborne dust, fumes, mists, radionuclides, or biological aerosols with no gas or vapor co-exposure, the 7740 is the correct choice for a Moldex platform. If gases or vapors are also detected, a combination cartridge is mandatory.

Understanding filter efficiency ratings is foundational: P100 is the highest NIOSH particulate rating, requiring filtration of at least 99.97% of particles at 0.3 microns — the most penetrating particle size — and the "P" designation confirms oil-proof resistance, making the 7740 suitable for mist environments as well as dry dust. For a full breakdown of filter classes, the P95 vs R95 vs P100 filter class guide explains when each efficiency tier is required by OSHA standards.

Because the 7740 has no End-of-Service-Life Indicator (ESLI), OSHA 1910.134 requires an employer-developed change schedule based on industrial hygiene data or cartridge manufacturer guidelines. The respirator cartridge ESLI guide covers how to build a defensible change schedule for non-ESLI filters.

When a nuisance-level vapor odor exists alongside particulates, some buyers consider the Moldex 7760 — a single-use P100 filter with nuisance-level OV/AG relief. The distinction between nuisance relief and rated protection is critical; the nuisance relief vs rated respirator protection guide outlines where that line sits legally and practically.

Who Should Buy the Moldex 7740?

What Does the Moldex 7740 Protect Against?

What the Moldex 7740 Does NOT Protect Against

The Moldex 7740 is a particulate-only filter. It provides zero protection against any gas or vapor hazard. Using the 7740 in a gas or vapor environment while believing it provides chemical protection is a life-safety error.

• Organic vapors (solvents, petroleum distillates, paints, adhesives, coatings) — requires an OV cartridge such as the Moldex 7100 OV cartridge or a combo set.
• Acid gases (chlorine, hydrogen chloride, sulfur dioxide, hydrogen fluoride) — requires an AG-rated cartridge such as the Moldex 7200 AG cartridge.
• Organic vapors + acid gases combined — requires the Moldex 7300 OV/AG cartridge or a P100 combo.
• Ammonia and methylamine — requires the Moldex 7400 AM cartridge or a P100 combo.
• Multi-gas and vapor mixtures — requires the Moldex 7600 Multi-Gas Smart cartridge or the 7667 Multi-Gas/P100 combo.
• Carbon monoxide, hydrogen cyanide, or other IDLH-level gases — no air-purifying respirator protects against these at IDLH concentrations.
• Oxygen-deficient atmospheres (below 19.5% O2 at sea level) — not detectable by the wearer; fatal without supplied air.

Best Applications for the Moldex 7740

Lead Abatement and Renovation Work

Lead paint disturbance during renovation, repair, and painting (RRP) work generates lead-containing dust and chips that exceed OSHA PELs rapidly. The Moldex 7740's P100 rating captures lead particulate at ≥99.97% efficiency — the minimum filter class required under EPA RRP and OSHA 29 CFR 1926.62 for disturbance of lead-containing coatings. Pair with a Moldex half-mask respirator that has passed a fit test for the wearer's face.

Silica Dust Control (Concrete, Masonry, Stone)

Respirable crystalline silica (RCS) generated by cutting, grinding, or drilling concrete, stone, or masonry is regulated under OSHA's silica rule (29 CFR 1926.1153 / 1910.1053). P100 filtration exceeds the N95 minimum for most Table 1 tasks, providing added protection margin for workers who remain in dusty zones throughout a shift. The Moldex 7740 mounted on a Moldex 9000 full-face respirator also provides eye and face protection from abrasive debris.

Woodworking and Furniture Manufacturing

Fine wood dust — particularly hardwood species — is classified as a Group 1 carcinogen by IARC. P100 filters capture wood dust including ultrafine particles at the highest mechanical filtration efficiency available in air-purifying respirators. The Moldex 7740 is a cost-effective ongoing-use filter for woodshop environments where dust is the only regulated hazard and no finishing solvents are in use.

Welding Fume and Metal Grinding

Welding operations generate metal oxide fumes (iron, manganese, chromium, nickel) in the respirable size range. P100 filters capture metal fumes effectively. For welding processes that also generate ozone or nitrogen oxides in enclosed or poorly ventilated spaces, evaluate whether a combination cartridge from the Moldex cartridge and filter collection is more appropriate based on air monitoring data.

Pharmaceutical and Chemical Powder Handling

Potent active pharmaceutical ingredients (APIs), fine chemical powders, and catalyst dusts require the highest available filtration efficiency. The Moldex 7740's P100 rating on an appropriate Moldex full-face respirator is standard practice in pharmaceutical production environments where no vapor hazard is co-present and engineering controls have been applied first.

Moldex 7740 Pros and Cons

Compatible Moldex Respirators

The Moldex 7740 does NOT fit any non-Moldex respirator. Attempting to force-mount Moldex filters on a different brand's facepiece creates a false sense of protection and may void NIOSH approval for both components.

Moldex 7740 vs Other Moldex Cartridges and Filters

Moldex 7740 vs Moldex 7740+ (IonicAir)

The Moldex 7740+ is the only direct sibling at the same $21.19/pair price point. Both carry NIOSH P100 certification and identical compatibility across Moldex 7000, 7800, and 9000 series respirators. The 7740+ adds Moldex's IonicAir electrostatic-assist technology, which Moldex claims reduces breathing resistance over the filter's service life. The 7740 (this product) is a standard mechanical P100 filter without the ionic layer.

Buy verdict: If breathing resistance during sustained physical activity is a concern — heavy manual labor, confined-space work — the 7740+ is worth considering at the same price. For standard light-to-moderate duty applications where breathing effort is not a reported issue, the 7740 delivers the same certified P100 protection level.

Moldex 7740 vs Moldex 7760 (P100 + Nuisance OV/AG)

The Moldex 7760 is a single-unit (not a pair) P100 filter with an activated carbon layer providing nuisance-level relief from organic vapor and acid gas odors — sold at $5.31/single. The 7760 is not a rated chemical cartridge; it does not meet NIOSH standards for OV or AG protection. The 7740 (pair) costs $21.19 and provides no vapor relief, but the per-unit cost comparison favors the 7740 for two-filter use.

Buy verdict: Choose the 7760 only when a mild nuisance odor accompanies particulate exposure and chemical concentrations are confirmed below OSHA action levels. When vapor or gas concentrations approach or exceed action levels, move directly to a rated combination cartridge such as the 7367 OV/AG/P100 combo — do not rely on nuisance relief.

Moldex 7740 Quick Answers

What does the Moldex 7740 filter protect against?

The Moldex 7740 protects against airborne particles — including dust, fumes, mists, metal oxides, biological aerosols, and radionuclides — at a minimum efficiency of 99.97%. It is NIOSH-certified P100 and oil-proof (P-rated), making it suitable for both dry particulate and oil-mist environments. It provides no protection against gases or vapors of any kind.

Does the Moldex 7740 protect against organic vapors or solvents?

No. The Moldex 7740 is a particulate-only filter with no activated carbon or chemical sorbent layer. It does not protect against organic vapors, solvents, acid gases, ammonia, or any gas-phase chemical hazard. For organic vapor plus particulate protection, use the Moldex 7367 OV/AG/P100 combination cartridge.

What respirators is the Moldex 7740 compatible with?

The Moldex 7740 is compatible with the Moldex 7000 series half-mask, Moldex 7800 series half-mask, and Moldex 9000 series full-face respirators. It does not fit any non-Moldex respirator brand. Cross-brand mounting is not NIOSH-approved and compromises the protection factor.

How many filters come in one pack of Moldex 7740?

The Moldex 7740 is sold as a pair — two filters per bag — at $21.19. Both filters are required for proper two-sided mounting on Moldex half-mask and full-face respirators.

Does the Moldex 7740 have an ESLI (End-of-Service-Life Indicator)?

No. The Moldex 7740 does not include an ESLI. Because particulate filters do not deplete by chemical adsorption, change interval for P100 filters is typically based on breathing resistance (replace when it becomes difficult to breathe through) or a time-based change schedule required under OSHA 29 CFR 1910.134 when no ESLI is present.

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

The Moldex 7740+ adds IonicAir electrostatic-assist technology to the same NIOSH P100 mechanical filter base as the 7740. Both are priced at $21.19 per pair and share identical respirator compatibility. The 7740+ is designed to maintain lower breathing resistance over the filter's working life compared to the standard 7740.

Can the Moldex 7740 be used for asbestos or lead abatement?

Yes. OSHA regulations for lead (29 CFR 1926.62) and asbestos (29 CFR 1926.1101) permit or require P100 filters for specific exposure levels. The Moldex 7740's NIOSH P100 certification meets this filter class requirement when mounted on a properly fit-tested Moldex 7000 or 9000 series respirator and used within an employer-maintained respiratory protection program.

Moldex 7740 Specifications

Helpful Buying Guides

• P95 vs R95 vs P100 Filter Class Guide — understand when each NIOSH particulate rating is required and how oil resistance affects your selection
• Respirator Cartridge ESLI Guide — how to build an OSHA-compliant change schedule when your cartridge or filter lacks an End-of-Service-Life Indicator
• Nuisance Relief vs Rated Respirator Protection — the regulatory and practical difference between activated carbon nuisance layers and certified chemical cartridges
• Best 3M Respirator Cartridges — cross-brand comparison if you are evaluating Moldex against 3M equivalents for P100 particulate use
• 3M vs Honeywell North Respirator Cartridges — brand comparison guide covering P100 filter options across major manufacturers
• Best Honeywell North Cartridge for Welding Fumes — if your welding environment requires a non-Moldex platform
• Best Honeywell North Cartridge for Mold Remediation — P100 filter selection for mold remediation across brands

Moldex 7740 Frequently Asked Questions

Is the Moldex 7740 NIOSH approved?

Yes. The Moldex 7740 carries NIOSH approval under 42 CFR Part 84 as a P100 particulate filter, confirming filtration efficiency of at least 99.97% for both oil and non-oil aerosols at the most penetrating particle size (approximately 0.3 microns).

Can I use the Moldex 7740 for silica dust exposure?

Yes, provided the respirator and filter combination is part of a compliant written respiratory protection program that includes fit testing. OSHA's respirable crystalline silica rules (29 CFR 1910.1053 and 1926.1153) specify minimum filter classes by task; P100 meets or exceeds the class requirement for all silica-exposure tasks listed in OSHA Table 1 where a respirator is required.

How long does a Moldex 7740 filter last before replacement?

Moldex 7740 filters do not have an ESLI. Replace when breathing resistance increases noticeably — a physical indication that the filter media is loaded — or according to your employer's written change schedule established under OSHA 29 CFR 1910.134(d)(3)(iii). In heavy-dust environments, service life may be as short as one shift; in light-particulate environments, a pair may last several weeks.

Does the Moldex 7740 work on the Moldex 9000 full-face respirator?

Yes. The Moldex 7740 is fully compatible with the Moldex 9000 series full-face respirator (models 9001, 9002, 9003). Using a full-face respirator with the 7740 also provides integrated eye and face protection, which is valuable in high-dust or abrasive particulate environments.

What is the difference between the 7740 and 7367 combo cartridge?

The Moldex 7740 filters particulate only — it provides no gas or vapor protection. The 7367 is a combination cartridge that provides P100 particulate filtration plus organic vapor and acid gas protection. If your job involves both particles and chemical vapors or gases, the 7367 is the correct choice. The 7740 should only be selected when a confirmed particulate-only hazard is present.

Can the Moldex 7740 be worn with a beard?

No air-purifying tight-fitting respirator provides adequate protection when facial hair breaks the facepiece seal. OSHA prohibits the use of tight-fitting respirators when facial hair contacts the sealing surface. The Moldex 7000 and 9000 series respirators that carry the 7740 are both tight-fitting and subject to this requirement.

Is the Moldex 7740 suitable for spray painting?

Only if the spray application involves exclusively non-toxic water-based paints or coatings with no solvent content above nuisance levels and no isocyanate hazards. Standard spray painting with solvent-based paints, lacquers, or polyurethane coatings requires an OV-rated or OV/AG-rated cartridge — not a particulate-only filter. The 7367 OV/AG/P100 combination or the 7667 Multi-Gas/P100 smart combo are more appropriate for spray finishing work.

How do I know when to replace the Moldex 7740 filter?

Replace the Moldex 7740 when breathing through the respirator becomes noticeably harder — increased breathing resistance indicates the filter is loaded with captured particles. If the filter becomes physically damaged, wet, or contaminated, replace it immediately. Your employer's written respiratory protection program must include a change schedule that accounts for exposure levels, shift duration, and task-specific dust generation rates.

Does the Moldex 7740 protect against mold spores?

Yes. Mold spores are biological aerosol particles in the 1–30 micron size range. The 7740's P100 filter captures particles at ≥99.97% efficiency, well above the size of mold spores. For mold remediation work, confirm whether your program requires a half-mask or full-face respirator based on remediation area size and mold type per industry guidelines (e.g., EPA mold remediation guidelines or IICRC S520).

What is the Moldex 7740 color code?

NIOSH color-coding for P100 filters is magenta (purple-pink). The Moldex 7740 is color-coded per NIOSH standards to allow at-a-glance identification. Magenta indicates P100 particulate filtration — no gas or vapor protection is implied by this color designation.

Can I purchase Moldex 7740 filters individually instead of as a pair?

The Moldex 7740 is sold as a pair only at WC Safety ($21.19 for 2 filters). Moldex does not offer the 7740 in a single-filter purchase format. If you need a single-unit P100 filter with nuisance OV/AG relief, the 7760 ($5.31/single) is available separately, though it is a different product with different protection characteristics.

Is the Moldex 7740 appropriate for lead paint removal?

Yes, subject to OSHA 29 CFR 1926.62 requirements. At lead air concentrations at or above the action level (30 μg/m³ as an 8-hour TWA), a half-face air-purifying respirator with P100 filters is required. At concentrations above 10 times the PEL (500 μg/m³ TWA) or in IDLH conditions, a powered air-purifying respirator (PAPR) or higher level of protection is required. The 7740 meets the P100 filter class for qualifying lead abatement tasks.