ENVIRCO stretch fabric gripper system UPVC Grippers, standard, Cove,mono,edge, but as required by design & manufacture's specifications. CORE - Fire retardant compressible polyster padding of 12 mm thk. FRAME : Gripper fix on 75 x 6mm ply (fire retardant) patty as required by design. INSTALLATION : Installation in accordance with drawings and manufacturer's instruction. Installation of grippers in maximum length possible. From end-to-end butt joints with hairline. Joints locations shall not be visible in finished work. Install grippers so that joints between core material & grippers are not visible in finished work, rebate edge of rigid core material for flush fit.Install fabric without wrinkles or folds, maintaining horizontal/ vertical alignment of warp/woof of fabric, force fabric edges into clamping jaws, using tools & techniques that will not damage finish of the fabric complete to the satisfaction of the Engineer-In-Charge.