Moldex 7300 vs 3M 6003 OV+AG Cartridge — 2026 Comparison
Moldex 7300 vs 3M 6003: Which OV+AG cartridge is right for your platform?
Moldex 7300 vs 3M 6003 OV+AG Cartridge Comparison (2026)
Both the Moldex 7300 and the 3M 6003 are NIOSH-approved Type OV/AG combination cartridges. They cover the same dual-hazard scenario: simultaneous organic vapor and acid gas exposure, including hydrogen chloride (HCl), chlorine (Cl2), hydrogen fluoride (HF), sulfur dioxide (SO2), and hydrogen sulfide (H2S). Protection equivalence between them is not the issue. The platform you already own is.
If your workforce runs Moldex half-mask respirators, the 7300 is the correct cartridge. If they run 3M 6000 or 7500 series facepieces, the 6003 is. Neither cartridge cross-mounts. This guide walks through the specs, pricing, upgrade paths, and the use-case criteria for choosing OV+AG over OV-only so you can confirm your selection with confidence.
Quick Verdict
Buy the Moldex 7300 if your respirators are Moldex platform (6500, 7000, 7500, 9000 series). At $18.73/pair it is the lower-cost option. Customer rating: 4.3/5.
Buy the 3M 6003 if your respirators are 3M 6000 or 7500 series. Current price: $20.34/pair (regular $21.75). Both prices are Amazon-sourced and may vary.
Neither cartridge includes a P100 particulate pre-filter or an End-of-Service-Life Indicator (ESLI). If ESLI is required by your facility's respiratory protection program, see the Moldex 7600 Smart (Moldex platform) or the 3M 6006 (3M platform) upgrade path below.
Affiliate disclosure: Amazon links below are sponsored. You pay the same price; WC Safety earns a small commission at no cost to you.
Moldex 7300
3M 6003
Side-by-Side Specs
| Specification | Moldex 7300 | 3M 6003 |
|---|---|---|
| NIOSH Approval | OV + AG (dual class) | OV + AG (dual class) |
| Regulatory Standard | 42 CFR 84 | 42 CFR 84 |
| Acid Gases Covered | HCl, Cl2, HF, SO2, H2S | HCl, Cl2, HF, SO2, H2S |
| ESLI | No | No |
| P100 Pre-filter | No | No |
| Mount Type | Bayonet (Moldex) | Bayonet (3M) |
| Compatible Facepieces | Moldex 6500, 7000, 7500, 9000 series | 3M 6000, 7500 series |
| Cross-Brand Compatible | No | No |
| Price (pair) | $18.73 | $20.34 (sale) / $21.75 (reg) |
| Customer Rating | 4.3 / 5 | — |
| ESLI Upgrade Path | Moldex 7600 Smart | 3M 6006 |
| OV-Only Version | Moldex 7100 | 3M 6001 |
| Cartridge Collection | Moldex Cartridges | 3M Cartridges |
Head-to-Head Analysis
Platform Compatibility
This is the only factor that determines which cartridge you buy. The Moldex 7300 uses Moldex's bayonet interface and fits Moldex 6500 QL, 7000, 7500, and 9000 series half-masks. The 3M 6003 uses 3M's bayonet interface and fits 3M 6000 and 7500 series half-masks. Neither mounts to the other brand's facepiece. There is no adapter.
If you are outfitting a mixed fleet — some workers on Moldex respirators, others on 3M — you need both part numbers. Do not rely on visual similarity; the bayonet geometry differs at the locking tab angle and will not seat safely if forced.
Related: Moldex 7100 vs 3M 6001 OV Cartridge Comparison (same platform logic applies for OV-only cartridges).
Price Comparison
The Moldex 7300 is priced at $18.73/pair. The 3M 6003 is priced at $20.34/pair (on sale from $21.75). That is a $1.61 per-pair difference at current pricing. For occasional use, the gap is negligible. At scale — 50 workers replacing cartridges twice per shift — the Moldex 7300 saves roughly $161 per replacement cycle at these prices.
Both prices are Amazon-sourced and subject to change. Verify current pricing before procurement decisions.
Protection Equivalence — Dual NIOSH Class
Both cartridges carry NIOSH approval for organic vapor (OV) and acid gas (AG) under 42 CFR 84. That dual classification means a single cartridge handles the full hazard matrix in environments where both chemical classes are present. Covered acid gases include:
- Hydrogen chloride (HCl)
- Chlorine (Cl2)
- Hydrogen fluoride (HF)
- Sulfur dioxide (SO2)
- Hydrogen sulfide (H2S)
Neither cartridge adds a P100 particulate stage. If your SDS or industrial hygienist assessment identifies particulate co-exposure (metal fumes, dusts, mists), you must add a P100 filter to the cartridge stack. Confirm P100 compatibility with your specific facepiece model before ordering. Neither cartridge includes ESLI; change schedules must follow a written change-out schedule per OSHA 1910.134(d)(3)(iii)(B).
Upgrade Paths
Both platforms have a clear upgrade path when OV+AG coverage is insufficient:
- Moldex platform: The Moldex 7600 Smart adds ESLI (End-of-Service-Life Indicator), formaldehyde protection, and chlorine dioxide coverage beyond what the 7300 provides. The 7600 is the step up when your facility's respiratory protection program requires indicator-based change-out or when the contaminant list includes formaldehyde.
- 3M platform: The 3M 6006 is the multi-gas upgrade, adding broader multi-contaminant coverage including chlorine dioxide, hydrogen cyanide, and ammonia beyond the 6003's scope. No ESLI is included on the 6006 either.
See the full side-by-side upgrade comparison table below, and the standalone guide: Moldex 7600 Smart vs 3M 6006 Multi-Gas Comparison.
When to Choose OV+AG vs OV-Only
The OV+AG classification is required — not optional — when your exposure assessment identifies acid gas co-exposure alongside organic vapors. Common scenarios:
- Fume hood work: Acid cleaning with organic solvents (e.g., HCl + acetone, HF + IPA in semiconductor fabrication).
- Chemical processing: Reactor environments where by-products include both classes simultaneously.
- Acid cleaning operations: SO2 or HCl present with solvent-based degreasers.
- Lab environments: Mixed reagent storage or work steps where acid and solvent vapors co-exist in the breathing zone.
If your SDS review and industrial hygienist air monitoring confirm organic vapors only — no acid gases — the lower-cost OV-only options (Moldex 7100 or 3M 6001) are the correct specification. Do not over-spec cartridges if the hazard does not require it; doing so adds cost without additional worker protection at the confirmed exposure level. See the full guide: OV vs OV+AG vs Multi-Gas Cartridge Selection Guide.
Decision Guide
Buy the Moldex 7300 if:
- Your facepieces are Moldex 6500, 7000, 7500, or 9000 series
- Your exposure profile includes both organic vapors and acid gases
- ESLI is not required by your written respiratory protection program
- Lowest per-pair cost in the OV+AG category is a priority ($18.73/pair)
- You want a reviewed product with a 4.3/5 user rating
Buy the 3M 6003 if:
- Your facepieces are 3M 6000 or 7500 series
- Your exposure profile includes both organic vapors and acid gases
- ESLI is not required by your written respiratory protection program
- You have an established 3M procurement relationship and want to keep the platform consistent
Consider an upgrade if:
- Your facility's respiratory protection program mandates ESLI-based change-out (Moldex: 7600 Smart)
- Contaminant list includes formaldehyde, chlorine dioxide, or hydrogen cyanide
- Air monitoring shows concentrations close to IDLH, requiring multi-gas coverage
- A P100 particulate stage is also required — verify compatibility before ordering
Moldex 7300 — $18.73/pair
3M 6003 — $20.34/pair
Amazon prices are affiliate-linked and subject to change. WC Safety earns a commission at no cost to you.
Upgrade Path Comparison: Both Platforms
Both Moldex and 3M follow the same three-tier cartridge ladder. Your hazard assessment drives which tier you need; your platform determines which part number you buy.
| Tier | Moldex Platform | 3M Platform | Added Coverage vs Previous Tier |
|---|---|---|---|
| OV Only | Moldex 7100 | 3M 6001 | Organic vapors only; no acid gas protection |
| OV + AG | Moldex 7300 (this guide) | 3M 6003 (this guide) | Adds HCl, Cl2, HF, SO2, H2S coverage |
| Multi-Gas / ESLI | Moldex 7600 Smart | 3M 6006 | Broader multi-gas; Moldex 7600 adds ESLI + formaldehyde + ClO2 |
Note: The Moldex 7307 is an OV+AG variant designed for use with specific Moldex full-facepiece respirators. Confirm facepiece compatibility before specifying the 7307 vs the 7300.
For the full three-way cartridge selection logic, see: OV vs OV+AG vs Multi-Gas Cartridge Guide.
Frequently Asked Questions
Can I use the Moldex 7300 on a 3M respirator?
No. The Moldex 7300 uses Moldex's bayonet mount, which is not compatible with 3M facepieces. Using a cartridge on an incompatible facepiece voids the NIOSH approval and creates a leakage hazard. Use the 3M 6003 on 3M facepieces.
Can I use the 3M 6003 on a Moldex respirator?
No. The 3M 6003 bayonet does not mate with Moldex facepiece ports. Use the Moldex 7300 for Moldex facepieces.
Do either of these cartridges include ESLI?
No. Neither the Moldex 7300 nor the 3M 6003 includes an End-of-Service-Life Indicator. Both require a written change-out schedule per OSHA 1910.134(d)(3)(iii)(B). If your program mandates ESLI, the Moldex 7600 Smart (Moldex platform) is the only option in this family with an ESLI.
Do I need OV+AG or can I use an OV-only cartridge?
That depends entirely on your exposure assessment. If your SDS and air monitoring confirm acid gas co-exposure alongside organic vapors, OV+AG is required. If only organic vapors are present, the Moldex 7100 or 3M 6001 is appropriate. See the full selection guide: OV vs OV+AG vs Multi-Gas Cartridge Guide.
Are these cartridges approved for hydrogen sulfide (H2S)?
Yes. Both the Moldex 7300 and the 3M 6003 carry NIOSH approval covering hydrogen sulfide (H2S) as an acid gas. Confirm concentration limits against your air monitoring data. Neither cartridge is approved for IDLH-level H2S; SCBA is required at IDLH.
Can I add a P100 filter to either cartridge?
Not to the cartridges themselves — neither the 7300 nor the 6003 has a stacked P100 layer. For particulate + OV+AG protection, you need a separate P100 filter adapter on your facepiece if your facepiece model supports it. Verify compatibility with the specific Moldex or 3M facepiece model before ordering. See the full Moldex cartridge and filter collection or the 3M cartridge collection for stacked filter options.
What is the price difference between the Moldex 7300 and 3M 6003?
At current pricing, the Moldex 7300 is $18.73/pair and the 3M 6003 is $20.34/pair (sale from $21.75). That is approximately $1.61 per pair in favor of the Moldex 7300. Both prices are Amazon-sourced and subject to change.
How often should I change these cartridges?
Neither cartridge includes ESLI, so change frequency is governed by your facility's written change-out schedule under OSHA 1910.134(d)(3)(iii)(B). The schedule must be based on cartridge service life data from the manufacturer, workplace air monitoring data, temperature, humidity, and work rate. Do not extend cartridge use beyond the schedule based on odor threshold — many OV and AG contaminants have poor olfactory warning properties.
Is the Moldex 7300 the same as the Moldex 7307?
No. The Moldex 7307 is a variant designed for use with Moldex full-facepiece respirators. The 7300 is designed for Moldex half-mask facepieces. Both provide OV+AG protection, but facepiece compatibility differs. Confirm your facepiece model before ordering.
What is the upgrade from the Moldex 7300 if I need more coverage?
The direct upgrade on the Moldex platform is the Moldex 7600 Smart, which adds ESLI, formaldehyde protection, and chlorine dioxide coverage. See the full comparison: Moldex 7600 Smart vs 3M 6006 Multi-Gas Comparison.
What is the upgrade from the 3M 6003 if I need more coverage?
The direct upgrade on the 3M platform is the 3M 6006, which adds broader multi-gas coverage including chlorine dioxide, hydrogen cyanide, and ammonia. Note that the 3M 6006 does not include ESLI.
Do both cartridges cover the same acid gases?
Yes. Both the Moldex 7300 and the 3M 6003 are NIOSH-approved for the same set of acid gases: hydrogen chloride (HCl), chlorine (Cl2), hydrogen fluoride (HF), sulfur dioxide (SO2), and hydrogen sulfide (H2S). There is no protection equivalence difference between them for this hazard class. Platform compatibility is the only differentiator.
About the Editor
Steven Eaton is the lead editor at WC Safety with extensive hands-on experience specifying respiratory protection for industrial, chemical processing, and laboratory environments. All product guidance is cross-referenced against NIOSH approval data, manufacturer SDS documentation, and OSHA 1910.134.
Editorial Methodology
This comparison was produced using NIOSH-published approval data (42 CFR 84), manufacturer technical documentation, and direct product pricing verification from the WC Safety product catalog. Pricing data for the 3M 6003 was fetched directly from the WC Safety product page on June 10, 2026. No compensation was received from Moldex or 3M in exchange for coverage. All guidance reflects the editorial judgment of WC Safety staff based on publicly available technical data.
Content is reviewed on a 6-month cadence. For the most current pricing, follow the product links above.
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Safety Disclaimer
This guide is for informational and procurement-decision support purposes only. Cartridge selection for respiratory protection must be based on a documented workplace hazard assessment, employer respiratory protection program, and — where required — industrial hygienist review per OSHA 1910.134. WC Safety does not accept liability for respiratory protection decisions made without proper hazard evaluation.