The ASTM Standard Behind Puhui Industry’s Certified HDPE Piping Systems
When engineers specify HDPE piping for water supply, fire protection, or heavy-duty mining applications, they often look for PE4710 material — and the ASTM D3350 cell classification that defines it is 445574C. This seven-character code tells the complete story of material performance: density, melt index, flexural modulus, tensile strength, slow crack growth resistance, hydrostatic design basis, and UV stabilization.
At Puhui Industry, we don’t just know this code — we manufacture to it, certify to it, and ship ASTM D3350 HDPE pipe and fittings to 106+ countries worldwide. From raw material incoming inspection to finished fitting packaging, every step is controlled to meet the 445574C specification. Our products serve not only municipal water and fire networks but also demanding industrial sectors — including HDPE pipes for gold and copper mines, where abrasion resistance, chemical inertness, and long-term pressure retention are critical.
What PE 445574C Means for Your Project
| Digit | Property | PE4710 Value |
| 4 | Density | 0.941–0.955 g/cm³ — high density for structural integrity |
| 4 | Melt Index | Low flow rate — consistent extrusion and reliable fusion joints |
| 5 | Flexural Modulus | High stiffness — stability under soil loads and above-ground supports |
| 5 | Tensile Strength | High strength — handles internal pressure without yielding |
| 7 | Slow Crack Growth | Very high resistance — 50+ years of service life |
| 4 | Hydrostatic Design Basis | HDB = 1,600 psi @ 73°F — trusted pressure rating |
| C | Color/UV Stabilizer | Black with ≥2% carbon black — built-in UV protection |
Puhui Industry produces PE4710 HDPE pipe in diameters ranging from 2 inches to 64 inches (SDR 33 to SDR 7.4), all manufactured to ASTM F714, ASTM D3035, ASTM D3350, AWWA C906, and AWWA C901.
Global Certifications: NSF 61, WRAS, and FM Approved
What sets Puhui Industry apart is our commitment to independent third-party certification. Our HDPE piping systems carry product-level approvals from UL, WRAS, NSF, SAA, FM, AENOR, BV, and CE.
NSF/ANSI/CAN 61 — Drinking Water System Components — Health Effects
NSF/ANSI/CAN 61 is the nationally recognized standard that evaluates the health effects of materials used in drinking water systems. It establishes minimum health-effects requirements for chemical contaminants and impurities that may be imparted to drinking water from pipes, fittings, tanks, valves, and other wetted components. HDPE pipes and fittings certified to NSF/ANSI/CAN 61 are considered lead-free per the U.S. Safe Drinking Water Act.
Puhui Industry has successfully supplied NSF 61-approved HDPE pipes to municipal water projects in the U.S., including a notable supply to Miami, USA. Products that carry the NSF®-61 mark or NSF® pw (potable water) mark on the print string have been verified to meet both the health requirements of NSF/ANSI/CAN 61 and the performance/quality control requirements of NSF/ANSI 14.
WRAS — Water Regulations Approval Scheme (UK)
WRAS is an independent UK certification body for plumbing products and materials. WRAS approval demonstrates compliance with the UK Water Supply (Water Fittings) Regulations. Products bearing WRAS approval have passed independent testing and are confirmed to comply with UK water fittings regulations.
Puhui Industry supplies WRAS-approved HDPE fittings to projects requiring UK regulatory compliance. Our potable-grade PE100 pressure pipes carry WRAS certification for direct contact with drinking water.
FM Approved — Fire Protection Systems
Our FM Approved HDPE Fire Protection Pipes are certified under FM 1613 — the examination standard for Polyethylene (PE) Pipe and Fittings for Underground Fire Protection Service. FM-certified products must pass rigorous hydrostatic pressure testing — including the ability to withstand four times the rated working pressure without cracking, fracturing, or permanent deformation. Manufacturers must also maintain comprehensive quality control programs covering incoming materials, in-process testing, final inspection, equipment calibration, and full traceability.
Puhui Industry is recognized as a leading manufacturer of FM Approved HDPE Fire Protection Pipes, producing FM 1613-approved piping systems for underground fire protection. FM-approved HDPE pipes eliminate the risk of project rejection and deliver zero maintenance for 70+ years — a critical advantage for fire protection infrastructure.
Manufacturing Capability: From Resin to Finished Pipe
Puhui Industry operates from a 68,000 m² ISO-certified manufacturing campus with dedicated workshops for HDPE extrusion, PVC extrusion, and injection moulding, with overall manufacturing capacity reaching 200,000 tons annually.
Key production capabilities include:
Pipe diameters: 2 inches to 64 inches (DN50 to DN1600)
Wall thickness: DR33 to DR7.4
Standards compliance: ASTM F714, ASTM D3035, ASTM D3350, AWWA C906, AWWA C901, ISO 4427, EN 12201, AS/NZS 4130
Product lines: HDPE water supply pipes, HDPE fire protection pipes, HDPE drainage pipes, HDPE gas pipes, and custom injection-molded fittings
Every production batch is supported by an on-site QA laboratory, ensuring full traceability from raw material to finished product. Certificates and batch test reports are available on request for tender submissions.
What Makes Puhui Industry Stand Out for ASTM HDPE Piping?
✅ ASTM D3350 445574C / PE4710 compliance — material performance you can spec with confidence
✅ NSF/ANSI/CAN 61 certified — safe for potable water systems
✅ WRAS approved — compliant with UK water fittings regulations
✅ FM Approved (FM 1613) — certified for underground fire protection
✅ 200,000 tons annual capacity — reliable supply for large-scale projects
✅ Global track record — supplying 106+ countries since 2007
Ready to Specify? Contact Puhui Industry for certified ASTM D3350 HDPE pipe, FM Approved HDPE Fire Protection Pipes, or mining-specific HDPE solutions. Request certificates, batch test reports, or engineering support for your next infrastructure project — whether it’s a water main, a fire loop, or a mine dewatering system.
FAQ
1. Does PE 445574C mean the same thing as PE4710?
Not exactly. PE445574C is an ASTM D3350 cell classification describing specific material properties, while PE4710 is a broader high-performance polyethylene material designation established under PPI requirements. A PE4710 compound commonly meets the 445574C classification, but compliance should always be confirmed through the resin manufacturer’s certification and PPI listing.
2. What does the ASTM D3350 classification 445574C represent?
The code identifies the polyethylene compound’s density, melt index, flexural modulus, tensile strength, slow crack growth resistance, hydrostatic design basis, and color or UV stabilization. Each character represents a defined performance category under ASTM D3350.
3. What is PE4710 HDPE pipe used for?
PE4710 HDPE pipe is commonly used for municipal water supply, potable water transmission, mining pipelines, industrial process water, sewer force mains, irrigation, and underground fire protection systems.
4. Which ASTM standards apply to PE4710 HDPE pipe?
Common standards include ASTM D3350 for material classification, ASTM F714 for large-diameter polyethylene pipe, and ASTM D3035 for polyethylene pipe based on controlled outside diameter. AWWA C901 and AWWA C906 may also apply to water-service and water-main projects.
5. What is the hydrostatic design basis of PE4710?
PE4710 materials typically have a hydrostatic design basis of 1,600 psi at 73°F (23°C). The applicable pressure class of the finished pipe also depends on its DR/SDR, design factor, operating temperature, service conditions, and governing standard.
6. Is PE4710 suitable for drinking-water systems?
Yes, provided the finished pipe and relevant components are certified for potable-water contact, such as to NSF/ANSI/CAN 61. Buyers should verify that the specific pipe size, material, and production facility are included in the current certification listing.
7. Is ASTM D3350 compliance the same as NSF 61 certification?
No. ASTM D3350 classifies the physical and long-term performance properties of polyethylene materials. NSF/ANSI/CAN 61 evaluates potential health effects associated with products that contact drinking water. A potable-water project may require compliance with both.
8. Can PE4710 pipe be used for underground fire protection?
Yes, but the specified pipe and fittings must meet the project requirements and carry the appropriate FM Approval when FM-certified underground fire protection piping is required. Material classification alone does not constitute FM Approval.
9. Why is carbon black added to PE4710 pipe?
Carbon black improves resistance to ultraviolet radiation and outdoor weathering. Black PE pipe compounds manufactured in accordance with the applicable standard typically contain a controlled amount of well-dispersed carbon black.
10. What documents should buyers request from a PE4710 pipe manufacturer?
Buyers should request the technical data sheet, resin certificate, ASTM D3350 cell classification, PPI listing where applicable, production batch report, dimensional inspection report, hydrostatic test results, and relevant NSF, WRAS, FM, or other third-party certificates.
