F-30 - Copolymer of chlorotrif luoro-ethylene and ethylene is an alternative co-polymer. Lrradiated F-30 at certain condition it crosslinks readily. After crosslinking its mechanical properties are improved remarkedly.The molecular weight of F-30 has not been reported before. By using Flory's theory of elasticity

we determine the shress-strain curre of F-30 at the temperature above its melting point and find out the crosslinking 6 value to be 1.4. On the basis of Charlesby-Pinner relationship we find ou the dose of gelation (Rgel) of crosslinked F-30 to be Rgel 1.6 Mrad. From the obtained data

we can calculate the weight average moleculer eight of F-30 to be about 2.1×105.