Description

Nitchen polyvinyl acetate solid resins are used as low-profile additives in fiber-reinforced plastics (FRP) composites to achieve zero-shrinkage, class A surface quality, full viscosity control and design flexibility.

Unless a low-profile additive is used in the manufacture of composite parts, high shrinkage will occur. The addition of our pvac resins (polyvinyl acetate) minimizes this shrinkage to less than 0.05 %, resulting in extremely smooth, homogeneous surfaces.

Nitchen PVAC Resin (polyvinyl acetate) is a most effective thermoplastic anti-shrink (low-profile) additive for UP resin composites that are molded at high temperatures. In addition to zero shrinkage, certain high-temperature unsaturated polyester applications, such as SMC and BMC, require effective thickening to ensure easy handling of the composite and good glass-fiber distribution during mold flow: polyvinyl acetate HV grades, in combination with magnesium oxide or calcium oxide, are the perfect thickening systems for unsaturated resin composites. After maturation, this combination is ideal for preventing exudation of the thermoplastic resins. HV grade vinyl acetate homopolymer grades are used when only moderate or no thickening of the UP resin composite is required.

Benefits of our Polyvinyl Acetate (pvac resin):

• Zero shrinkage/expansion in FRP composites
• Excellent gloss and surface smoothness
• Effective thickening of SMC
• Easy processing and formulating
• Consistently high quality
• Good mechanical properties
• Rapid and complete solubility in styrene