Technical
Specifications

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ALUMINIUM

  • Alloy LM6 (Al – Si12), (Colour Code yellow) conforms to BS1490:1988 LM6.
  • Alloy LM25 (Al – Si7Mg0.5), (Colour code yellow/blue) conforms to BS1490:1988 LM25.
  • LM25 is available in four conditions – (M) as cast; (TE) precipitation treated; (TB7) solution treated and stabilised; and (TF) fully heat treated.
  • Tensile strength & hardness decrease fairly regularly with increasing temperature.
  • Carbide tipped tools, low cutting speeds and liberal tool lubrication are recommended when machining due to rapid wear caused by silicon content, otherwise machinability is good.
  • Resistance to corrosion on LM6 is excellent, but marginally less for LM25, in both atmospheric and marine conditions, anodising can enhance this. LM25 takes anodising better and has wider range of decorative colours.
  • LM25 offers slightly better mechanical properties and machinability than LM6.

RIGID POLYURETHANE

  • Elongation: 15%
  • Flexural Strength: 65 N/mm²
  • Flexural Deflection: 17%
  • Flexural Modulus: 1800 N/mm²
  • Impact Strength 21kJ/m²
  • Heat Distortion Temperature: 70°C
  • Dielectric Strength: 22kV/mm (test plaque 4.5mm thick)
  • Vol. Resistivity 1.3 x 1014 Ohm/cm

All values are typical.
Other polyurethane compounds available to produce variations in these characteristics.

Chemical Composition Of Aluminium Alloys

All as % LM6 LM25 A356 A357
Copper 0.1 0.20 0.25 0.1
Magnesium 0.10 0.20 – 0.6 0.20-0.45 0.5-0.75
Silicon 10.0 – 13.0 6.5 – 7.5 6.5 – 7.5 6.5 – 7.5
Iron 0.6 0.5 0.6 0.2
Manganese 0.5 0.3 0.35 0.10
Nickel 0.1 0.1 0.05
Zinc 0.1 0.1 0.35 0.10
Lead 0.1 0.1 0.05
Tin 0.05 0.05 0.05
Titanium 0.2 0.2 0.25 0.10-0.20
Aluminium Remainder Remainder Remainder Remainder
Others each 0.05 0.05 0.15 0.15
Others Total 0.15 0.15

Mechanical Properties

LM6
(Sand Cast)
LM6
(Die Cast)
A356
(Sand Cast)
A357
(Sand Cast)
0.2% Proof Stress (N/mm²) 60-70 120 185 240
Tensile Stress (N/mm²) 160-190 280 230 290
Elongation (%) 5 2 – 5 2 3
Impact Resistance Izod (Nm) 6.0
Brinell Hardness 50-55 55-60 75 80
Endurance Limit (5×108 cycles N/mm2) 51 70-100 56 110
Modulus of Elasticity (x10³N/mm²) 71 71 71 72
LM25 – M
(Sand Cast)
LM25 -TE
(Die Cast)
LM25 – TE
(Sand Cast)
0.2% Proof Stress (N/mm²) 80-100 120-150 130-200
Tensile Stress (N/mm²) 130-150 150*-180 190*-250
Elongation (%) 2 1* 2*
Brinell Hardness 55-65 70-75 75-90
Endurance Limit (5×108 cycles N/mm2) 70-100 55 80-110
Modulus of Elasticity (x10³N/mm²) 71 71 71
LM25 – TB7
(Sand Cast)
LM25 – TF
(Die Cast)
LM25 – TF
(Sand Cast)
0.2% Proof Stress (N/mm²) 80-110 200-250 220-260
Tensile Stress (N/mm²) 160* 230-280 280-320
Elongation (%) 2.5* 2*
Brinell Hardness 65-75 90-110 90-110
Endurance Limit (5×108 cycles N/mm2) 70-100 60 95
Modulus of Elasticity (x10³N/mm²) 71 71 71

Physical Properties

LM6 LM25 A356 A357
Coefficient of Thermal Expansion (per °C at 20 – 100°C) 0.00 00 20 0.00 00 20 0.00 00 22 0.00 00 21
Thermal Conductivity (cal/cm²/cm/°C at 25°C) 0.34 0.36 0.36 0.38
Electrical Conductivity (% copper strand at 20°C) 37 39 39 39
Density (g/cm³) 2.65 2.68 2.68 2.68
Freezing Range (°C approx.) 575-565 615-550 615-550 620-550

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