Spore strips for formaldehyde sterilization processes consist of bacteria spores inoculated on filter paper with the size of 6 x 38 mm and packaged in glassine envelopes. They are available with Geobacillus stearothermophilus (# 7953) of 10^5 CFU/carrier and conform with EN ISO 11138-1 + 5.

A microbiological laboratory with sterile work bench is required to aseptically transfer the spore strips into the growth medium after sterilization.

The growth medium for optimized growth of Geobacillus stearothermophilus spore strips is also available from gke.