MSA Acid Gas Flexi-Filters – P100 HEPA Filters for Advantage Respirators
The MSA Advantage 818344 P100 Flexi-Filters are low-profile respirator filter pads designed for compatible MSA Advantage respirators. These replacement filters provide P100 particulate filtration with nuisance-level acid gas and hydrogen fluoride relief in a lightweight, swept-back design.
The Flexi-Filter shape helps improve field of vision and balance compared with bulkier cartridge-style filters, making them useful for workers wearing respirators with welding helmets, face shields, goggles, or other PPE. Low breathing resistance supports comfort during long shifts, while finger tabs help make installation and removal easier without damaging the filter pads.
With a P100 rating, these filters provide 99.97% minimum filtration efficiency against particulate aerosols when used as part of an approved respirator configuration. The nuisance acid gas / HF feature is intended for nuisance-level relief only and should not be treated as full acid gas cartridge protection.
These MSA P100 Flexi-Filters are commonly purchased by safety managers, EHS teams, maintenance departments, construction crews, welding operations, utilities, oil and gas teams, manufacturing plants, and industrial purchasing departments using MSA Advantage respiratory protection programs.
Bulk Ordering & Procurement Support
Need MSA Advantage 818344 P100 Flexi-Filters for a welding crew, construction jobsite, municipal department, utility team, manufacturing plant, oil and gas operation, maintenance shop, or recurring respiratory protection program? ASA Supplies supports business, government, municipal, contractor, facility, and industrial purchasing teams with bulk quote support, volume pricing, purchase orders, and sourcing assistance.
Safety Note
These filters must be used only with compatible MSA Advantage respirators in an approved configuration. P100 filters protect against particulates, not oxygen deficiency or IDLH atmospheres. The acid gas / HF feature is for nuisance-level relief only and is not a substitute for approved acid gas cartridges where gas concentrations exceed exposure limits or cartridge protection is required. Respirator selection, fit testing, medical evaluation, training, filter changeout, and use must follow OSHA 29 CFR 1910.134 and your EHS program.
Quick Buying Details
Brand: MSA
Series: Advantage Flexi-Filters
Part Number: 818344
ASA SKU: MSA818344
Product Type: P100 Flexi-Filter respirator pads
Filter Rating: P100 with nuisance-level acid gas / HF relief
Pack Size: 2 filters per package
Compatibility: Compatible MSA Advantage respirators
Design: Low-profile, swept-back flexible filter pads
NIOSH: Listed by MSA with NIOSH approval/standards
Dimensions Listed by MSA: 0.748 in H x 5.039 in L x 8.583 in W
Weight Listed by MSA: 0.044 lb
Best Use: Particulate filtration with nuisance acid gas/HF relief in industrial respiratory protection programs
Key Features
- MSA part 818344 Advantage Flexi-Filters
- P100 particulate filtration for dusts, fumes, and mists
- Nuisance-level acid gas and hydrogen fluoride relief
- Low-profile design helps fit under welding helmets and face shields
- Swept-back shape helps improve field of vision
- Lightweight filter pads support worker comfort
- Low breathing resistance for extended wear
- Finger tabs help with installation and removal
- Sold as a 2-pack for respirator filter replacement programs
Common Uses & Applications
- Welding support work
- Grinding and sanding
- Construction work
- Manufacturing maintenance
- Utilities and public works
- Oil and gas maintenance
- Industrial plant work
- Metal fabrication
- Hazard-abatement support, when selected by a qualified respiratory protection program
- PPE programs using MSA Advantage respirators
Buying Guide: MSA 818342 vs. 818343 vs. 818344
Choose MSA 818342 when workers need standard P100 particulate filtration only.
Choose MSA 818343 when workers need P100 particulate filtration plus nuisance-level organic vapor and ozone relief.
Choose MSA 818344 when workers need P100 particulate filtration plus nuisance-level acid gas / HF relief.
Use approved MSA chemical cartridges or combination cartridges when the job involves gases or vapors above nuisance levels, specific chemical exposure limits, or required cartridge-level gas/vapor protection.
FAQ
What is MSA 818344?
MSA 818344 is an Advantage Flexi-Filter listed by MSA as P100 with nuisance-level acid gas / HF removal.
Is this a full acid gas cartridge?
No. This is a P100 Flexi-Filter with nuisance-level acid gas / HF relief. It should not replace approved acid gas cartridges when regulated acid gas exposure is present.
What does P100 mean?
P100 filters provide 99.97% minimum filtration efficiency against particulate aerosols when used as part of an approved respirator configuration.
Are these compatible with all respirators?
No. They are designed for compatible MSA Advantage respirators. Do not use them with other brands or unapproved configurations.
Can these be used for lead or asbestos work?
P100 filters are commonly used where high-efficiency particulate filtration is required, but lead or asbestos work must follow site-specific regulations, fit testing, written respiratory protection procedures, and EHS approval.
How are these filters packaged?
They are sold as a pack of 2 filters.
