Just blew $400 on a 'high-temp' respirator filter that started melting after one shift on the cupola.

2 comments

2 Comments

Sounds like you got a filter not rated for actual foundry work. Those high temp labels can be misleading if they don't list a specific heat rating. For cupola fumes you need something like a P100 rated for molten metal operations, not just general heat. The melting means it was probably a cheap chemical cartridge with plastic parts. A proper one should have a full silicone face piece and all metal hardware.

nina_ramirez10d ago

Used to think any mask labeled high temp was good enough. Your point about the plastic parts melting makes it clear why that's wrong. Gonna check for that metal hardware next time.