(APF = 50) Any air-purifying, full-facepiece respirator with an N100, R100, or P100 filter. (APF = 25) Any powered, air-purifying respirator with a high-efficiency particulate filter.
The main use is as pozzolanic material for high performance concrete. It consists of amorphous (non-crystalline) spherical particles with an average particle diameter of 150 nm, without the branching of the pyrogenic product. These synthetic forms may be classified as (1) wet. Silica fume is an ultrafine powder collected as a by-product of the silicon and ferrosilicon alloy production. Hosemann, R., Hindeleh, A.M., Bruckner, R. (APF = 25) Any supplied-air respirator operated in a continuous-flow mode Intentionally manufac- tured synthetic amorphous silicas are without contami- nation of crystalline silica. Molecular dynamics computer simulation of amorphous silica under high pressure. The following filters may also be used: N99, R99, P99, N100, R100, P100. (APF = 10) Any particulate respirator equipped with an N95, R95, or P95 filter (including N95, R95, and P95 filtering facepieces) except quarter-mask respirators. The invention provides a process for the production of a high grade amorphous silica having a purity of at least 90 active silica of the formula SiO 2.
Click here for information on selection of N, R, or P filters.
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