BIOplastics Screw Cap Tubes are an excellent means of storage. They are made of polypropylene, with a light frosted easy "write on" outer surface and a plain, homogeneous surface at the inside. Screw Cap Tubes can be frozen down to -200 °C and centrifuged up to 20.000 g.
Sterile is an "old" fashion way" mostly used in the past. In many cases in microbiology, not related to any PCR or qPCR sterile is sufficient. Eg. media for bacteriology are sterilized by autoclaving no assure that no bacteria are present. However DNA DNA/RNA fragments, DNase, RNase are very likely present. Notice that none of the labs doing sterilization, regardless hospital labs, etc. do NOT test on absence DNA, DNA/RNA fragments, DNase, RNase!! Also any method as EtO, Cobalt 60, Electron beam, autoclave do not influence or reduce DNA, DNA/RNA fragments, DNase, RNase!!
AS a matter of fact most manufacturers of micro centrifuge tubes do NOT test for DNA DNA/RNA fragments, DNase, RNase. They just sterilize.
BIOplastics manufacturing process, as well as any products which are manufactured by us, are tested for DNA DNA/RNA fragments, DNas e, RNase, and pyrogen absence. To please "old type" customers and "non-knowledgeable" users we also offer sterile products by, after testing for DNA DNA/RNA fragments, DNase, RNase absence, carousel-ling the products around a cobalt 60 source which kills any living germs.
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