PVC Window Profile Weather Resistant CPE 135A Chlorinated Polyethylene Impact Modifier for Outdoor Durability

CPE 135A from RUNYE is a premium weather-resistant chlorinated polyethylene impact modifier specifically developed for PVC window and door profile extrusion. This specialized grade offers superior long-term outdoor durability, making it the ideal choice for building and construction applications where profiles are exposed to sunlight, rain, temperature fluctuations, and environmental pollutants throughout their service life. The polymer backbone of CPE 135A consists of a saturated carbon chain that is inherently resistant to oxidative degradation, photochemical attack, and ozone cracking — all common failure mechanisms for unsaturated rubber-based impact modifiers. When incorporated into rigid PVC window profile formulations at recommended levels of 6-10 phr, CPE 135A forms a three-dimensional elastomeric network that effectively absorbs and dissipates impact energy, dramatically improving the impact resistance of finished profiles while preserving the excellent stiffness, dimensional stability, and surface aesthetics required for premium window and door systems. The unique core-shell dispersion morphology of CPE 135A in the PVC matrix also contributes to improved melt strength during extrusion, allowing for higher line speeds and better control of profile dimensions in complex multi-hollow chamber designs. Our advanced chlorination process ensures uniform chlorine distribution throughout each particle, resulting in consistent elastomeric properties and reliable performance batch after batch.

• Outstanding Weatherability: The saturated hydrocarbon backbone with pendant chlorine atoms provides exceptional resistance to UV degradation, thermal aging, and ozone attack, ensuring PVC window profiles maintain their impact strength and color stability after years of outdoor exposure in diverse climatic conditions from tropical to arctic environments.
• High Impact Strength Retention: Unlike butadiene-based modifiers that suffer rapid embrittlement upon weathering, CPE 135A retains over 85% of its original impact strength after 5000 hours of accelerated QUV weathering testing, contributing to window profiles that remain tough and serviceable for decades.
• Excellent Melt Strength Enhancement: The high molecular weight and elastomeric nature of CPE 135A significantly improves PVC melt strength during profile extrusion, enabling higher draw-down ratios, better control of wall thickness in multi-chamber designs, and reduced die swell for improved dimensional accuracy.
• Broad Stabilizer Compatibility: Fully compatible with calcium-zinc, organotin, and lead-based heat stabilizer systems, providing formulation flexibility for window profile manufacturers serving different regional markets with varying regulatory frameworks on heavy metal content in building materials.
• Superior Surface Finish: CPE 135A contributes to a smooth, glossy surface finish on extruded profiles without the surface roughness or die build-up issues sometimes encountered with high-loading acrylic impact modifier systems, resulting in aesthetically appealing window frames that resist dirt accumulation and are easy to clean.
• Thermal Insulation Contribution: The elastomeric CPE 135A phase in the PVC matrix provides additional thermal insulation properties that complement the multi-chamber profile design, contributing to the overall energy efficiency rating of finished window and door systems in building envelope applications.
• Weldable and Fabricable: Profiles modified with CPE 135A exhibit excellent hot plate weldability for corner joining and good machinability for hardware installation, with no adverse effects on weld seam strength or screw retention in typical window fabrication operations.

RUNYE CPE 135A is extensively used in the extrusion of PVC window profiles, door frames, sliding door systems, and curtain wall components for residential, commercial, and industrial buildings. It is also suitable for PVC fencing, decking, siding, soffit, and other exterior building products that require long-term weather resistance and impact durability. CPE 135A modified profiles meet or exceed the requirements of international standards including EN 12608, ASTM D4726, and GB/T 8814 for unplasticized PVC profiles used in window and door applications. The material is compatible with co-extrusion processes for manufacturing capped profiles with virgin PVC capstock over recycled or foamed core layers, allowing window system manufacturers to optimize material costs while maintaining premium surface quality and weather resistance on exposed surfaces.

Our CPE 135A is packaged in 25kg woven bags with inner PE liner to prevent moisture absorption during storage and transportation. Bulk packaging options include 500kg jumbo bags and 1000kg palletized loads available upon request. Every production batch is rigorously tested in our in-house laboratory for chlorine content, tensile strength, elongation, thermal stability, and particle size distribution before release. We maintain complete batch traceability records and provide certificates of analysis (COA) with every shipment. Our factory operates under an ISO 9001:2015 certified quality management system, with raw material inspection, in-process control, and final product testing at every stage. Samples are retained for 12 months for quality traceability. We offer free samples for customer evaluation and technical support for formulation optimization to ensure maximum performance in your specific application.