LAM PVDF-K |KYNAR® 2850 and 740 resin Standard and Fabric-backed Sheet and Rolls Lamcorr offers extruded Kynar® 2850 (flex) and homopolymer 740 PVDF resins as standard sheet form and in fabric-backed rolls and sheets. Like ECTFE, PVDF provides an effective solution for mid-range service temperatures. Copolymer sees more frequent use in applications that require flexibility and thermoforming. Homopolymer provides more structural integrity and permeation resistance. Both PVDF grades, though versatile in corrosion protection, do not lend themselves to strong alkaline environments.