Explore our high-performance, precision-engineered valve and fitting catalog, designed for rigorous temperature and pressure ratings under DIN standards.
Ehao Plastic Group stands at the forefront of the global polymer processing sector. We operate as a high-tech private enterprise fully integrating professional research & development with scale production of civil construction piping, high-specification agricultural irrigation systems, and custom precision plastic injection moulds.
As an industry-recognized leader in PVC, UPVC, and PPR flow control valves across China, Ehao has systematically cultivated academic-industrial partnerships with leading institutions, including the Chinese Academy of Sciences and Zhejiang University. These collaborations focus on structural optimization, molecular degradation prevention, and hydrostatic pressure limit improvements.
Our core manufacturing hub utilizes advanced extrusion production lines and computer-controlled automatic injection molding systems imported from Germany. This machinery ensures unmatched stability and structural homogeneity. To guarantee the highest standards, every component undergoes a rigorous 26-step scientific testing protocol, ensuring 100% compliance with DIN 8077 and DIN 8078 standards prior to shipment.
"Guided by our core values—honesty, dedication, innovation, and mutual value creation—Ehao integrates science and engineering to design piping systems that endure. Our business framework prioritizes premium quality for survival, technology for continuous advancement, and dedicated service for trust."
Our piping and valve systems are engineered to withstand demanding environments, ranging from residential plumbing to heavy industrial applications.
From selecting and configuring the right material grade and mould geometries to helping you finance custom capital equipment acquisitions, Ehao optimizes your production line efficiency and increases profitability.
Polypropylene Random Copolymer (PPR) has revolutionized modern fluid distribution systems. Its molecular structure features a random distribution of ethylene monomers along the polypropylene backbone. This design provides superior mechanical properties, excellent thermal stability, and high chemical resistance, making it an ideal alternative to traditional metallic piping.
Under German Standards DIN 8077 (Dimensions) and DIN 8078 (General Quality Requirements and Testing), PPR pipes must meet strict dimensional and structural standards. The random insertion of ethylene groups reduces polymer crystallinity, lowering the glass transition temperature. This molecular modification prevents brittle fractures under physical stress or cold conditions.
Ehao's automated production lines ensure consistent wall thickness and minimal eccentricity, preventing localized stress concentrations. This design allows our piping systems to handle high hydrostatic stress profiles, maintaining reliable performance for over 50 years under standard operating pressures and temperatures.
Quality control at Ehao begins with raw material verification and continues through final dimensional testing. Our 26-step quality control system features:
| Physical Parameter | Test Standard | Ehao PPR Nominal Value |
|---|---|---|
| Density | ISO 1183 | 0.909 g/cm³ |
| Melt Flow Rate (230°C / 2.16kg) | ISO 1133 | 0.30 g/10 min |
| Flexural Modulus | ISO 178 | 800 MPa |
| Thermal Conductivity | DIN 52612 | 0.24 W/m·K |
| Linear Expansion Coefficient | DIN 53752 | 1.5 x 10⁻⁴ K⁻¹ |
To address thermal expansion in exposed piping, Ehao uses advanced co-extrusion technology to manufacture composite PPR pipes. These multi-layer designs incorporate a middle layer of glass fiber-reinforced polymer (PPR-FG-PPR). This composite structure reduces the linear thermal expansion coefficient by up to 75%, matching the performance of metallic piping while retaining the corrosion-free benefits of polymer systems.
Unlike copper or galvanized iron piping, PPR does not leach heavy metals or support bacterial growth, making it a hygienic choice for potable water. Its low thermal conductivity reduces heat loss in hot water systems, improving overall energy efficiency. Additionally, because PP-R is a pure hydrocarbon polymer, it is fully recyclable, minimizing environmental impact.
Explore Ehao's specialized valve systems, designed for quick installation, low pressure drop, and reliable sealing in harsh chemical environments.
A comprehensive overview of our custom mold capabilities and polymer piping designs, engineered for reliable long-term performance.
Get answers to common technical and sourcing questions about PPR and PVC piping systems, standards compliance, and custom design capabilities.
Complete your layout configurations with our high-pressure double union, octagonal, and compact valves, designed for secure and leak-free installations.
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