Large diameter 300-400mm HDPE Rods Plastic Bar
Product Performance
Mechanical Properties
High Toughness: Tensile strength 20-35 MPa (20%-30% higher than PP), elongation at break ≥300% (compared to approximately 50%-100% for ordinary plastics), impact strength (Izod notch) ≥80 kJ/m² (still >50 kJ/m² at -30°C), withstands repeated bending without cracking (suitable for dynamically loaded components).
Medium Rigidity: Flexural strength 25-40 MPa, elastic modulus 700-1200 MPa (50%-70% lower than POM), suitable for medium loads (such as support structures).
Environmental Stress Cracking Resistance: Environmental Stress Crack Resistance (ESCR) >1000 hours (at 0.21 MPa), significantly higher than LDPE (<100 hours), suitable for long-term stress loading scenarios.
Thermal Properties
Excellent temperature resistance: Long-term operating temperature range -60°C to +80°C (short-term resistance to 100°C), melting point approximately 130°C (heat deflection temperature 80-100°C under a load of 1.82 MPa), and high toughness even at low temperatures (no brittle cracking at -40°C).
Low thermal conductivity: Thermal conductivity of 0.42-0.50 W/(m·K) (approximately 1/50 that of metal), making it an excellent thermal insulation material (such as cold storage pipe insulation).
Chemical Properties
Excellent chemical resistance: Stable to most acids (e.g., sulfuric acid, hydrochloric acid), alkalis (e.g., sodium hydroxide), saline solutions, and organic solvents (e.g., ethanol, acetone) (no significant swelling at concentrations <30%). The material is only resistant to strong acids (e.g., concentrated sulfuric acid, concentrated nitric acid) and halogenated hydrocarbons (e.g., carbon tetrachloride).
Excellent hydrolysis resistance: Long-term use in humid environments shows no significant performance degradation (e.g., outdoor equipment component lifespan >8 years).
Electrical Properties
Excellent Insulation: Volume resistivity ≥ 10¹⁵Ω·cm, dielectric strength 20-30 kV/mm, dielectric constant 2.3-2.4 (1kHz), suitable for low-voltage electrical insulation components (such as switch housings and junction boxes).
Processability
Easy to Process: Can be processed by extrusion (rod thickness tolerance ±0.15mm), injection molding (short molding cycle), and thermoforming (temperature 170-190°C), suitable for mass production of complex components. Waste is 100% recyclable (shredded and directly reused for extrusion).
Welding Compatibility: Supports hot air welding, ultrasonic welding, and friction welding, with weld strength reaching 80%-90% of the parent material (under standard operation).
Other Characteristics
Self-lubricating: Friction coefficient 0.2-0.4 (0.1-0.2 higher than POM, but lower than PTFE), enabling low-friction operation (e.g., bearings and guide rails) without the need for lubricants.
Wear Resistance: Akron abrasion value ≤ 0.05 cm³/1.61 km (20%-30% higher than POM, but better than PP), suitable for low- to medium-speed friction scenarios.
UV Resistance: HDPE rods without UV inhibitors are susceptible to aging (surface cracking and strength loss) when exposed outdoors. Weather-resistant grades (with the addition of carbon black or hindered amine light stabilizers) can resist UV radiation (outdoor service life >10 years).
Specific Application Areas and Components
1.Chemical Storage and Transportation
Chemical Storage Tank Floating Roof Support Structures
Used in floating roof support systems for tanks storing various acids, alkalis, and saline solutions, HDPE rods, with their excellent toughness (effectively buffering impact loads from raw materials) and chemical resistance (strong resistance to acid and alkali solutions with concentrations below 30%), ensure long-term crack-free support structures, resulting in a service life exceeding 15 years and significantly reducing tank maintenance costs.
Acid and Alkali Pipeline Connection Components
Used in flanges, elbows, and other key components connecting acid and alkali pipelines. This material not only exhibits chemical resistance (can withstand organic solvents with concentrations below 30%) but also exhibits excellent resistance to environmental stress cracking (remaining stable within a temperature range of -40°C to +80°C), effectively ensuring the long-term sealing of piping systems with a service life exceeding 20 years. It is suitable for the demanding operating conditions of the chemical and environmental protection industries.
2. Municipal Engineering
Drainage System Connectors
As the core material for connectors such as sockets and tees in municipal sewage and stormwater pipe systems, HDPE rods, with their excellent environmental stress cracking resistance (ESCR > 1000 hours) and low wear characteristics (Akron abrasion value ≤ 0.05 cm³/1.61 km), ensure long-term, reliable sealing at pipe connections, extending the overall system life to over 50 years and significantly reducing the maintenance frequency of urban drainage facilities.
Manhole Covers and Cable Trench Gratings
As an alternative to traditional cast iron manhole covers and cable trench protective gratings, this material not only offers high toughness (Izod notched impact strength ≥ 80 kJ/m²) and excellent wear resistance (service life > 10 years), but also offers a 50%-70% weight reduction compared to cast iron components. Furthermore, the lack of metal recycling significantly reduces the risk of theft, improving the safety and cost-effectiveness of municipal facilities.
3. Agricultural Irrigation
Drip/Sprinkler Pipe Lining Materials
Applications in drip and sprinkler irrigation systems utilize HDPE rods for PE pipe linings. Their excellent chemical resistance (effectively resisting corrosion from fertilizers and pesticides) and wear resistance (service life >10 years) ensure clean, pollution-free irrigation water quality, while extending the overall service life of the pipe system to over 20 years and improving agricultural irrigation efficiency.
Agricultural Machinery Wear-Resistant Structural Components
Applications in key wear-resistant components such as guide wheels and support frames on agricultural machinery like seed drills and harvesters. This material not only offers excellent toughness (effectively resisting soil impact loads) and wear resistance 50%-80% higher than PP, but also offers a 30%-50% reduction in weight compared to metal components. This extends the service life of agricultural machinery while reducing energy consumption by 10%-15%, ultimately contributing to lighter and more efficient agricultural equipment.
4. Machinery Manufacturing
Low-Speed Bearings and Guide Systems
Used in low-speed bearing and guide components in food machinery and packaging equipment, HDPE rods, with their self-lubricating properties (friction coefficient 0.2-0.4) and excellent wear resistance (service life >5 years), can replace traditional metal components, eliminating the need for additional lubrication systems, significantly reducing maintenance costs and improving equipment reliability.
Small Transmission Gear Assemblies
Used in the manufacture of plastic gears for small speed reducers and conveyor belt drive systems, this material not only offers high toughness (effectively resisting impact loads) and chemical resistance (withstanding long-term lubricant corrosion), but also offers a 20%-30% weight reduction compared to nylon gears and a 10-15dB reduction in operating noise, ensuring transmission efficiency while improving the comfort of the equipment's operating environment.
