PE-HD (30% glass fiber)

Designation

High density polyethylene / HDPE (30% Glass Fiber, High Density)

Tradenames

Accutech, Adell, Edgetek, Hifill

Typical uses

Pipes, toys, bowls, buckets, milk bottles, crates, tanks, containers, film for packaging, blown bottles for food.

Compositional summary

(CH2-CH2)n + glass filler
Material family	Plastic (thermoplastic, semi- crystalline)
Base material	PE-HD (Polyethylene, high density)
% filler (by weight)	30 %
Filler/reinforcement	Glass
Filler/reinforcement form	Short fiber (<5mm)
Polymer code	PE-HD-GF30

Composition detail

Polymer	70			%
Glass (fiber)	30			%

Physical properties

Density

1.18

–

1.28

g/cm3

Mechanical properties

Young’s modulus	4.83	–	6.21	GPa
Specific stiffness	3.91	–	5.08	MN.m/kg
Yield strength (elastic limit)	41.4	–	49.7	MPa
Tensile strength	51.7	–	62.1	MPa
Specific strength	33.4	–	40.7	kN.m/kg
Elongation	1.5	–	2.5	% strain
Compressive modulus	4.83	–	6.21	GPa
Compressive strength	41.4	–	48.3	MPa
Flexural modulus	4.81	–	5.5	GPa
Flexural strength (modulus of rupture)	75.8	–	82.7	MPa
Shear modulus	1.76	–	2.26	GPa
Bulk modulus	7.1	–	7.45	GPa
Poisson’s ratio	0.367	–	0.382
Shape factor	9.3
Hardness – Vickers	12	–	15	HV
Hardness – Rockwell M	48	–	52
Hardness – Rockwell R	75	–	90
Elastic stored energy (springs)	152	–	231	kJ/m3
Fatigue strength at 10^7 cycles	20	–	26	MPa

Impact & fracture properties

Fracture toughness	1.94	–	2.95	MPa.m0.5
Toughness (G)	0.705	–	1.55	kJ/m2
Impact strength, notched 23 °C	5.71	–	6.3	kJ/m2
Impact strength, notched -30 °C	5.45	–	6.6	kJ/m2
Impact strength, unnotched 23 °C	18.1	–	20	kJ/m2
Impact strength, unnotched -30 °C	16.4	–	19.8	kJ/m2

Thermal properties

Melting point	120	–	140	°C
Glass temperature	-125	–	-90	°C
Heat deflection temperature 0.45MPa	127	–	129	°C
Heat deflection temperature 1.8MPa	102	–	129	°C
Maximum service temperature	90	–	110	°C
Minimum service temperature	-82	–	-72	°C
Thermal conductivity	0.36	–	0.461	W/m.°C
Specific heat capacity	1.51e3	–	1.57e3	J/kg.°C
Thermal expansion coefficient	84.8	–	88.2	µstrain/°C
Thermal shock resistance	82.1	–	112	°C
Thermal distortion resistance	0.00416	–	0.00534	MW/m

Electrical properties

Electrical resistivity	3.3e24	–	3e25	µohm.cm
Electrical conductivity	5.75e-24	–	5.22e-23	%IACS
Dielectric constant (relative permittivity)	2.7	–	2.9
Dissipation factor (dielectric loss tangent)	5e-4	–	0.001
Dielectric strength (dielectric breakdown)	19.7	–	21.7	MV/m
Comparative tracking index	600			V

Magnetic properties

Magnetic type

Non-magnetic

Optical, aesthetic and acoustic properties

Transparency	Opaque
Acoustic velocity	1970	–	2260	m/s
Mechanical loss coefficient (tan delta)	0.0111	–	0.0133

Absorption & permeability

Water absorption @ 24 hrs

0.02

–

0.06

%

Processing properties

Polymer injection molding	Acceptable
Polymer extrusion	Acceptable
Polymer thermoforming	Limited use
Linear mold shrinkage	0.2	–	0.6	%
Melt temperature	137	–	316	°C
Mold temperature	30	–	50	°C
Molding pressure range	68.8	–	138	MPa

Durability

Water (fresh)	Excellent
Water (salt)	Excellent
Weak acids	Excellent
Strong acids	Acceptable
Weak alkalis	Excellent
Strong alkalis	Excellent
Organic solvents	Limited use
Oxidation at 500C	Unacceptable
UV radiation (sunlight)	Fair
Flammability	Highly flammable