Rapid Ref : 3M-837542 Mfr Ref : 837542

3M Speedglas Gas Filter A2 (Organic Vapor / Acid Gas)
837542 3M-837542

Name: 3M Speedglas Gas Filter A2 (Organic Vapor / Acid Gas)
SKU: 3M-837542
Price: 96.41 GBP

£96.41 EX VAT

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Speedglas 9100 Adflo Parts FAQs

Straight answers to the questions people ask most when choosing and looking after spare parts for a powered air welding helmet with an auto-darkening filter.

How do I make sure a spare part fits my helmet?

Start with the model markings on the helmet itself and on the filter lens, then check them against the user manual, which lists the parts that belong to your version. Helmets in the same family often come in several variants, with different filter sizes, cover plates and side windows, so a part that looks right may not be.

If you cannot find a marking, compare the old part side by side with the replacement, and check the part number printed on it. If you are still unsure, our team can help you match the part to your helmet before you order.

How often should I change the outer protection plate?

There is no fixed interval. Change it when spatter, scratches or grinding dust make it hard to see through, or when it has pitted or cracked. A dirty or damaged plate forces you to lean in and strain, which is a safety issue as well as a comfort one.

Outer plates are the sacrificial layer that protects the filter lens, so it is sensible to replace them freely rather than risk scratching the lens itself. Heat-resistant and scratch-resistant types exist, and the right one depends on how much spatter and grinding your work produces.

How do I choose the right shade range for a replacement auto-darkening filter?

The shade you need depends on the process, the current and the brightness of the arc, so work from the welding procedure or your risk assessment rather than a guess. Many filters offer a fixed low shade for grinding or setting up and a variable range for welding.

A wide variable range covers most MIG, TIG and stick work. Check that the replacement has the same outline size as the original, and that any upgrade or replacement kit is listed as suitable for your helmet version, as the fittings can differ.

Which filters do I need for the powered air unit, and when do I replace them?

The unit normally needs a particle filter for welding fume. Where there are gases or vapours, such as solvents, a suitable gas filter can be fitted as well, and some systems use an odour filter or a spark guard for added protection. Choose the filter type from your workplace risk assessment, not from habit.

Replace a particle filter when it is damaged, clogged, or when the unit's airflow warning shows that airflow has dropped. Pre-filters trap larger dust and are changed more often, which helps the main filter last longer.

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