PEHD, PP closure. Innovative, single-use containers are safer than glass and excellent for storing sterile fluids and pharmaceutical / biotech products. No cleaning, no prep, no set-up costs. Materials meet the following requirements CFR 21, 177.150, USP Class VI, non-cytotoxic. Sterile / leakproof. PEHD, PP closure. Innovative, single-use containers are safer than glass and excellent for storing sterile fluids and pharmaceutical / biotech products. No cleaning, no prep, no set-up costs. Materials meet the following requirements CFR 21, 177.150, USP Class VI, non-cytotoxic. Sterile / leakproof.