Searching for the best and cheapest short term solution for a respirator, I'm now looking at this product. When this project is completed, I'll focus on better long term solutions for upcoming projects in regards to media blasting & painting.
RESPIRATOR:
http://www.mcmaster.com/#catalog/117/1812/=e774zw
For Organic Vapors, Acid Gases, With P100 Filter
TC-84A-0164
$56.31
Replacement filters (if I read this right): 6 pack - 9100T19* $72.90
If that's the case, they must be fabulous and a great incentive for a DIY apperatus.
Kinda short on tech specs, but some sites may or may not even show a pic with less info. Surely this is safe(-r) with silica dust. The ears can be protected with a head sock or haz-mat suit. That just leaves protecting the eyes. Maybe unvented painters googles (just seal up any vent holes in those or regular googles for this project). I AM treating silica dust as a deadly chemical - for sure.
Since I don't know anyone at OSHA nor do I have access to their secretive safety data, those P100 filters must be
THEEE!! difinitive filters of this century.