HDPE ROD

1. Basic Physical Parameters:

• Diameter & Length:

General Grade: Standard range (Φ10mm~Φ300mm) with basic lengths (1m/2m, cut-to-order).

Engineering Grade: Extended range (Φ5mm~Φ500mm, including custom sizes) and export-grade lengths (2.44m).

High-End Grade: Widest range (Φ2mm~Φ600mm) with precision-controlled lengths (1m/2.44m/3m), suitable for demanding dimensional requirements.

• Density & Molecular Weight:

General Grade: Medium molecular weight (MMWHDPE, 200k~500k) with moderate density (0.94~0.96g/cm³).

Engineering Grade: High molecular weight (HMWHDPE, 500k~1000k) and modified density (0.95~0.97g/cm³).

High-End Grade: Narrow-distribution medium-high molecular weight (300k~800k) and ultra-uniform density (0.950±0.002g/cm³), critical for consistent performance in precision applications.

• Standards: Aligns with GB/T 1446 (dimensional), ASTM D4773 (length), ISO 1183-1 (density), and GB/T 3682 (molecular weight).

2. Core Mechanical Properties:

• Tensile Strength:

General Grade: 25~35MPa (basic load-bearing).

Engineering Grade: Enhanced to 35~50MPa via glass fiber reinforcement (trade-off: lower elongation, see below).

High-End Grade: Stable at 35±2MPa, prioritizing consistency over extreme strength (critical for precision components).

• Elongation at Break:

General Grade: High ductility (200%~400%).

Engineering Grade: Reduced (150%~250%) due to modification (e.g., fiber reinforcement).

High-End Grade: Balanced (250%±30%), retaining flexibility while ensuring uniformity.

• Impact Toughness (Low-Temperature Performance):

General Grade: 20~50kJ/m² (-20℃).

Engineering Grade: Improved to 30~60kJ/m² (-30℃).

High-End Grade: Superior (-40℃, 40~70kJ/m², no breakage), suitable for extreme cold environments.

• Hardness:

Engineering Grade: Highest (70~80D, modified for rigidity).

High-End Grade: Balanced (65±3D) with exceptional uniformity, avoiding brittleness or softness.

• Standards: Tested via GB/T 1040/ASTM D638 (tensile/elongation), GB/T 1843/ASTM D256 (impact), and GB/T 2411/ASTM D2240 (hardness).

3. Thermal Performance and Chemical Resistance:

• Service Temperature Range:

General Grade: Basic (-40℃~80℃, short-term 100℃).

High-End Grade: Extended (-50℃~90℃ continuous use), enabling deployment in harsh climates or high-temperature systems (e.g., food machinery).

• Chemical Resistance:

General Grade: Resists dilute acids/alkalis, saltwater, and ethanol (except concentrated nitric/sulfuric acid).

High-End Grade: Expanded resistance to organic solvents (kerosene, diesel) and steam (80℃), critical for chemical pipelines or industrial equipment.

• Standards & Applications: Complies with GB/T 2918 (environmental conditioning), HG/T 2690 (chemical lining), and ASTM D543 (chemical resistance). Typical uses: chemical transport, food processing, and low-temperature engineering.