Ashless paper. 95% collection efficiency of 1micron. 58% DOP on 0.3 micron particles. Easily countable for Alpha particles, obtaining 70% count and a penetration absorbtion of approximately 30%. Good efficiency for industrial dusts and for particulate matter size 10 microns and under to submicron to .01 micron. Sampler may be operated for approximately 1 hour without overheating. Dissolvable with dimethylphthlate
