Strength in numbers

Aluminium Alloy   |   BS-L

L59 H16 or H26 Sheet


Equipment for heating and cooling: heat exchangers, air condition evaporators, motor vehicle radiators, aircraft and military components, freezer linings, office equipment. Tubing, piping. Cladding alloy. Pressure vessels.

Characteristic Properties:
Very good resistance to atmospheric corrosion. Very good weldability. Good formability by pressing, drawing and roll forming. Medium strength alloy. Better mechanical properties (in particular at elevated temperatures) than 1xxx-alloys. Properties very close to those of 3003.

Precautions and Warnings:
Actual performance requires careful design of tools, lubrication and metal surface condition.

Chemical Composition

BS 4L59(1985)
Alloy L59
Chemical Element % Present
Aluminium (Al) balance
Other (Each) 0.05 max
Copper (Cu) 0.1 max
Titanium + Zirconium (Ti+Zr) 0.1 max
Chromium (Cr) 0.1 max
Others (Total) 0.15 max
Zinc (Zn) 0.2 max
Magnesium (Mg) 0.3 max
Silicon (Si) 0.5 max
Iron (Fe) 0.7 max
Manganese (Mn) 0.9 - 1.5

The material shall be supplied cold rolled (H16) or cold rolled and partially annealed (H26).

Alloy Designations

Aluminium alloy L59 - 3103 is covered by Standard BS EN 4L59 (1985) 

Temper Types

The most common tempers for L59 - 3103 aluminium are:

  • H16
  • H26

Supplied Forms

L59 - 3103 aluminium is supplied in the following forms:

  • Sheet
  • Strip

Generic Physical Properties

Physical Property Value
Density 2.61 g/cm³
Melting Point 655 °C
Thermal Expansion 23.1 x10^-6 /K
Modulus of Elasticity 69.5 GPa
Thermal Conductivity 160 W/m.K
Electrical Resistivity 42 % IACS

Mechanical Properties

BS 4L59(1985)
Sheet - 0.4mm to 0.8mm
Mechanical Property Value
Elongation A50 mm 2 Min %
Tensile Strength 160 Min - 195 Max N/mm2

Mechanical properties relate to material with a nominal thickness of 0.4mm up to and including 0.8mm. The specification contains other values for different material thicknesses.