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HDPE

HDPE (High-Density Polyethylene) is a thermoplastic polymer belonging to the polyolefin family. It is produced via polymerization of ethylene (ethylene) with a low degree of branching, resulting in a high density and therefore better mechanical properties than standard polyethylene (LDPE).

HDPE is known for its rigidity, impact resistance, chemical resistance and low water absorption. The material is relatively inexpensive, easy to process (e.g., via extrusion or injection molding), and has a wide range of applications in both the industrial and consumer sectors.

Technical description

Nylon is a polymer composed of long chains of repeating units formed by the polymerization of diamines and dicarboxylic acids. The material has a high melting point, a good strength-to-weight ratio, and good processing capabilities. Nylon is able to withstand both mechanical and thermal stresses well, making it ideal for applications from mechanical parts to textile products.

Nylon’s hydration is an important feature: it absorbs water from the environment, which can affect its mechanical properties, such as strength and ductility.

Technical characteristics

Specific gravity

~ 0.94 – 0.97 g/cm³ (higher than LDPE, but still lightweight)

Tensile strength

~ 20 – 37 MPa

Modulus of elasticity

~ 0.8 – 1.5 GPa

Elongation at break

10% – 100% (depending on type and processing conditions)

Impact resistance

Good, especially at low temperatures

Melting point

~ 130 – 135 °C

Chemical resistance

Very good against acids, bases and most solvents

Temperature range

-50 °C to +80 °C (above 80 °C it deforms slowly)

UV resistance

Moderate – may become brittle without UV stabilizers

Water absorption

Negligible / virtually zero

Water absorption

Excellent via extrusion, injection molding, welding

Typical Applications

Piping for gas and drinking water
Tanks and vessels for chemical storage
Packaging (such as bottles and crates)
Toys, home and garden products
Construction membranes and foils
Geotechnical applications (sheet piling, pond liner)
Container materials and pallets

Comparison with other plastics (such as POM, PET, PEEK):

HDPE
1. Density: ~0,95
2. Wear resistance: Good
3. Impact resistance: – Good
4. Temperature resistance:
  -50 °C till +80 °C
5. Price: €
UHMPE
1. Density: ~0,93
2. Wear resistance: Very high
3. Impact resistance: – Very high
4. Temperature resistance:
  -269 °C till +80 °C
5. Price: €€€
LDPE
1. Density: ~0,92
2. Wear resistance: Moderate
3. Impact resistance: – Good
4. Temperature resistance:
  -40 °C till +60 °C
5. Price: €

HDPE

Producttype

Technical description

Technical characteristics

Typical Applications

Comparison with other plastics (such as POM, PET, PEEK):

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