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Polymer Additives for Window Frame. Versatile Application: Suitable for window frames, panels, fences, pipes, and injection molded parts. Excellent Impact Strength: Core-shell acrylic structure provides reliable weather resistance and impact modification. High Processing Efficiency: Free flowing powder with low shrinkage and excellent plasticization efficiency. Premium Appearance: White powder with high gloss and >99% passing rate for 20 mesh sieving. Professional Customization: Professional engineer team available to create special formulations for specific demands. Quality Assurance: All products are tested and COA provided before delivery to guarantee qualification.