Polyester resin fibreglass laminates GRP

Rapid moulding techniques for the production of rigid plastic shapes or shells (chair seats, etc.) require specialist knowledge and advanced equipment beyond the resources of the small workshop, but glass-fibre laminates, familiarly known as GRP, offer a simple method of forming rigid structures whose only disadvantage is that one surface, inside or outside according to the type of former used, will be smooth and the other rough. In essence the shaped moulding is composed of laminations of chopped strand glass mat impregnated with polyester resin. The resin must be thrixotropic, i.e. it must be fluid enough for brush coats, but must be capable of building up so that it stays in position and does not creep downhill. Assuming that a simple box shape is to be moulded, then an exact pattern (Figure 27:1) must be made of timber or other suitable material, using waterproof bonding agents {Araldite epoxy resin, etc.), with a generous overhang all round so that the rough edges of the rim can be trimmed up afterwards. The sides of the box should be tapered if possible, as this will facilitate withdrawal, and sharp edges and internal

Was this article helpful?

0 0
The Complete Guide To Wood Finishing

The Complete Guide To Wood Finishing

Wood finishing can be tricky and after spending hours on building your project you want to be sure that you get the best outcome possible. In The Complete Guide To Wood Finishing you will learn how to get beautiful, professional results no matter what your project is, even if you have never tried your hand at wood finishing before. You will learn about every step in the wood finishing process from a professional wood finisher with years of experience.

Get My Free Ebook

Post a comment