Overview
PPH (Polypropylene Homopolymer) is a semi-crystalline thermoplastic derived from propylene monomers through polymerization. It represents the most rigid variant of polypropylene materials, distinguished by its high crystallinity and molecular regularity. As a commodity plastic, PPH offers an optimal balance between performance and cost-effectiveness. Its production accounts for approximately 30% of global polypropylene output, with major manufacturing hubs in China, Western Europe, and North America.
Physical and Chemical Properties
PPH exhibits superior mechanical properties compared to copolymer PP variants, with a tensile strength range of 30-40 MPa and Rockwell hardness of R90-110. The material maintains dimensional stability up to 120°C continuously, with short-term heat resistance to 150°C. Chemically, PPH demonstrates exceptional resistance to acids, alkalis, and organic solvents, though it is susceptible to oxidation by strong acids like concentrated sulfuric acid. Its water absorption rate is remarkably low at <0.01% over 24 hours, making it ideal for humid environments.
Main Applications
In industrial settings, PPH is primarily utilized for corrosion-resistant equipment including chemical storage tanks, fume scrubbers, and electroplating baths. The material meets FDA and EU 10/2011 standards for food contact applications when properly formulated. The automotive industry employs PPH for battery casings, air ducts, and interior trim components due to its vibration damping properties. Recent advancements in nucleated PPH grades have expanded applications to thin-wall packaging and medical devices requiring gamma radiation resistance.
Safety and Storage
PPH pellets should be stored in moisture-proof packaging below 40°C with relative humidity under 60%. Prolonged exposure to UV radiation causes degradation; stabilized grades containing carbon black or HALS additives are recommended for outdoor applications. Processing safety requires adequate ventilation to prevent accumulation of thermal decomposition products above 300°C. Material safety data sheets (MSDS) classify PPH as non-hazardous, though dust explosion precautions apply during handling of fine powders.
B2B Procurement Guide
Industrial buyers should specify critical parameters: melt flow rate (typically 0.5-25 g/10min), isotacticity (>95%), and additive packages. For welding applications, ensure compatibility between pipe and fitting materials from the same supplier. Bulk procurement (20+ metric tons) typically attracts 8-15% price discounts. Consider lead times of 4-6 weeks for custom-compounded grades with specialized additives like antistatic agents or flame retardants.
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