Robuta

https://nrc-publications.canada.ca/eng/view/object/?id=02064e79-aabb-4040-8657-2f3bd1835936 Microvoids in unsaturated polyester resins containing poly(vinyl acetate) and composites with... Microvoids in unsaturated polyester resins containing poly(vinyl acetate) and composites with calcium carbonate and glass fibers unsaturated polyester resins