3M 8511 Vs Moldex 2300N95
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Quick answer
Published · Last updated
Both are valved NIOSH N95 cups for hot, dusty work — same rating, equivalent filtration. The 3M 8511 uses 3M’s Cool Flow valve; the Moldex 2300N95 uses Moldex’s Ventex valve and a Dura-Mesh shell, and is made in the USA. Protection is equivalent; choose on fit, comfort, and supply preference.
3M 8511 vs Moldex 2300N95: at-a-glance
| Spec | 3M 8511 | Moldex 2300N95 |
|---|---|---|
| NIOSH rating | N95 (≥95% non-oil) | N95 (≥95% non-oil) |
| Exhalation valve | Yes — 3M Cool Flow | Yes — Moldex Ventex |
| Form factor | Molded cup | Molded cup |
| Outer shell | Standard | Dura-Mesh (resists collapse) |
| Country of origin | Varies | Made in USA |
| Typical pack | 10 / box | 10 / box |
| Sterile/source control use | No (valved) | No (valved) |
| Best for | Hot, dusty work | Hot, dusty work + USA-made |
The two respirators
3M 8511
The 3M 8511 is the valved N95 cup most crews reach for in heat — the Cool Flow valve vents warm, moist air and the comfort straps suit long shifts.
Moldex 2300N95
The Moldex 2300N95 pairs a Ventex exhalation valve with the collapse-resistant Dura-Mesh shell, made in the USA. It’s the natural cross-brand alternative for hot, dusty jobs where you want a domestic supply or a different fit.
Key differences
Different valves, same goal
Both vent exhaled heat and moisture — 3M’s Cool Flow and Moldex’s Ventex achieve the same comfort benefit. Neither changes inhalation protection.
Shell and origin
The Moldex adds a Dura-Mesh shell that resists collapse in heat and is made in the USA; the 8511 is the most widely available valved N95.
Where neither belongs
Because both are valved, neither is used in sterile fields or for source control — the valve releases unfiltered breath. For those settings use an unvalved or surgical N95.
Which should you buy?
| Your situation | Pick | Why |
|---|---|---|
| Hot, humid, or outdoor dust work | Either | Both vent heat via an exhalation valve |
| Domestic supply chain required | Moldex 2300N95 | Made in USA |
| Standardized on 3M | 3M 8511 | Most widely available valved N95 |
| Cup collapses in heat | Moldex 2300N95 | Dura-Mesh resists collapse |
| Maximize fit-test pass rate | Fit-test both | Different cup geometry |
| Source control / sterile area | Neither — use unvalved | Valves release unfiltered air |
Fit & compatibility
Both are one-size valved N95 cups requiring a clean-shaven seal, an OSHA fit test, medical evaluation, and a user seal check. For the unvalved cross-brand pairing, see 8210 vs Moldex 2200N95; to weigh a valve at all, see valved vs unvalved. Browse all valved respirators.
Related guides
- Disposable respirators & N95 masks: the complete guide
- Valved vs unvalved N95
- 3M 8210 vs Moldex 2200N95 (unvalved)
- 3M 8210 vs 8511
- N95 vs KN95 vs P100
- P100 vs N95: the difference
- How to fit test a respirator
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- N95 respirators
- All disposable respirators
Key takeaways
- Either: Hot, humid, or outdoor dust work — Both vent heat via an exhalation valve.
- Moldex 2300N95: Domestic supply chain required — Made in USA.
- 3M 8511: Standardized on 3M — Most widely available valved N95.
Bottom line
Both the 3M 8511 and Moldex 2300N95 meet their NIOSH rating, so the choice is about matching the respirator to the task, the wearer’s fit, and your budget — not whether you are protected. Work through the at-a-glance table and the scenarios above, then fit-test your pick before relying on it in a hazardous atmosphere. For the full selection framework across every rating and form factor, see our complete disposable respirator & N95 mask guide, or browse all disposable respirators to check current pricing and availability.
Frequently asked questions: 3M 8511 vs Moldex 2300N95
About this guide. Written by Steven Eaton, founder of WC Safety, drawing on published NIOSH approvals and manufacturer datasheets for each respirator. WC Safety is an independent industrial-PPE review site; we do not accept payment for rankings. Always follow your employer’s written respiratory-protection program and OSHA 29 CFR 1910.134.
Related reference
Neighbouring references on this site: 3m 8210 vs 8511, 3m 8511 vs honeywell df300 n95, how to choose a respirator cartridge: complete selection guide, and moldex 2200n95 vs 2300n95: unvalved vs valved n95 — which to buy?.
Why trust WC Safety
WC Safety is an independent, affiliate-supported review site. It is not a retailer: it holds no inventory, takes no orders, and earns only from qualifying purchases through clearly marked links — which never changes what a product is rated to do. Standards language is taken from the regulation text directly, and ratings are reported as the manufacturer publishes them. We run no laboratory and perform no testing of our own. Where published sources disagree, we say so and plan on the conservative figure rather than the flattering one.
Our methodology
Figures come from the regulation and the published specification, in that order. Derated numbers are calculated, not estimated. Nothing here is presented as a measured result, because we measure nothing.
Researched and written by Steven Eaton, editor of WC Safety. Steven holds no safety certification and does not test products; this page compares what manufacturers and regulators publish, with the gaps in that record marked. Last reviewed August 2026.
Frequently Asked Questions
What is moldex 2300N95?
The Moldex 2300N95 pairs a Ventex exhalation valve with the collapse-resistant Dura-Mesh shell, made in the USA. It’s the natural cross-brand alternative for hot, dusty jobs where you want a domestic supply or a different fit.
What is different valves, same goal?
Both vent exhaled heat and moisture — 3M’s Cool Flow and Moldex’s Ventex achieve the same comfort benefit. Neither changes inhalation protection.
What is shell and origin?
The Moldex adds a Dura-Mesh shell that resists collapse in heat and is made in the USA; the 8511 is the most widely available valved N95.
What is where neither belongs?
Because both are valved, neither is used in sterile fields or for source control — the valve releases unfiltered breath. For those settings use an unvalved or surgical N95.
What is Fit & compatibility?
Both are one-size valved N95 cups requiring a clean-shaven seal, an OSHA fit test, medical evaluation, and a user seal check. For the unvalved cross-brand pairing, see 8210 vs Moldex 2200N95; to weigh a valve at all, see valved vs unvalved.
What is bottom line?
Both the 3M 8511 and Moldex 2300N95 meet their NIOSH rating, so the choice is about matching the respirator to the task, the wearer’s fit, and your budget — not whether you are protected. Work through the at-a-glance table and the scenarios above, then fit-test your pick before relying on it in a hazardous atmosphere.
What is frequently asked questions?
About this guide. Written by Steven Eaton, founder of WC Safety, drawing on published NIOSH approvals and manufacturer datasheets for each respirator.
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