Whatman reaction folders are sealable bags for hybridization and incubation reactions. The folders are open on three sides to allow easier insertion of a wet membrane when compared to standard hybridization bags. The folders can be sealed with a standard heat-sealer. Available in 8 x 10 in (20.3 x 25.4 cm) size. Sealable hybridization bags Here you can find the certificate: https://www.cytivalifesciences.com/en/de/support/quality/certificatesMeer tonenMinder tonen