make rigid

See: fix
References in periodicals archive ?
According to Bayer, when used to make rigid foams for thermal insulation the quality of foam with 8 to 15 per cent renewable raw materials, "matches or even surpasses that of conventional products.
Radical as this approach seems, it's based on proven technology that has been used commercially to make rigid and flexible PVC dryblend for over 12 years.
Exceptional elongation and flexural modulus combine to make rigid yet durable and tough prototypes.