VACUUM THERMAL INSULATOR

摘要

A vacuum thermal insulator which is excellent in thermal insulation property and maintainability in that property is disclosed. The vacuum thermal insulator comprises a shell which defines a vacuum space inside and comprises at least one layer (GB layer) comprising a thermoplastic resin and satisfying the formula (1):WxlambdxP<1x10-6 (1)wherein W is a thickness (m) of the GB layer, lambd is a thermal conductivity (W/m.K) of the GB layer and P is an oxygen permeability (cc/m2.day.atm) of the GB layer at 23° C. in a humidity of 50% RH.