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OFHC Copper

OFHC Copper Suppliers

OFE (Oxygen-Free Electronic) or OFHC (Oxygen-Free High Thermal Conductivity) Copper is the highest purity grade of copper at 99.99%.

Are you looking for a bespoke manufactured OFHC Copper product, insensitive to stress corrosion cracking? Speak to City Special Metals today, either via calling us or through a contact form. Alternatively, look through a range of other specialist alloys for information on our other bespoke manufactured products.

OFHC Copper Stockist Range

Product Form Range From Range To
Copper OFE Plate icon

Copper OFE Plate

6.35mm 127mm
Copper OFE Round Bar icon

Copper OFE Round Bar

6.35mm 200mm
Copper OFE Square Bar icon

Copper OFE Square Bar

25.4mm 50.8mm
Copper OFE Sheet icon

Copper OFE Sheet

0.254mm 3.2mm
Copper OFE Coil icon

Copper OFE Coil

0.076mm 152.4mm
Copper OFE Wire icon

Copper OFE Wire

2mm 4mm
Copper OFE Tube icon

Copper OFE Tube

3mm o/d x 1mm wall 101.6mm o/d x 12.7mm wall

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    Beneficial Properties

    • Conductivity Very good thermal and electrical conductivity
    • Durability Strong performance, toughness and resilience
    • Flexibility Good workability, weldability and easy to machine
    • Corrosion-Resistant High resistance to certain corrosive environments and elements, fatigue and wear

    Markets & Applications

    • Electrical components and equipment such as: conductors, microwave mechanisms, transistor elements, seals in electric appliances
    • High vacuum environments
    • Applications where there is little risk of undesirable chemical reactions
    • High Voltage electrodes
    • Particle accelerators

    OFHC Copper Composition

    Mechanical Properties

    Metallurgical Condition Hard
    Yield Strength KSI (MPa) 20 (137) Max
    Tensile Strength KSI (MPa) 31-37 (213-255)
    Hardness HV 40-65
    Elongation (50mm) 33 min - 42 max

    Technical Specifications

    Form ASTM
    Plate F68 B152 B187
    Rods F68 B152 B187
    Sheet F68 B152 B187
    Strip F68 B152 B370
    Wire F68 B1 B2


    Copper Cu 99.99min
    Oxygen O 0.0005 max

    Physical Properties

    Co Efficient of Thermal Expansion
    -191-16°C 10-6/°K 14.1
    20-300°C 10-6/°K 17.7
    Density g/cm³ 8.96
    Melting Point °F 1981
    °C 1083
    Modulus of Elasticity at 20°C KSI 17000
    Youngs / Shears Modulus MPa 127000
    Specific Heat J/g-K°C 0.39
    Thermal Conductivity at 20°C W.m-¹°C 386-394
    Electrical Conductivity IACS @ 20°C 101
    Thermal Coefficients of Electrical Resistance 0-100°C 10-3/K 3.81

    Copper OFE

    Copper Alloy Properties

    OFHC Copper is electrolytically refined in a carefully regulated, oxygen-free environment. Our copper elements have reduced oxygen levels of .001% or below and each is thermally & electrically conductive.

    Oxygen-free copper products perform extremely well during hot and cold forming, whilst both Coppers also boasts excellent corrosion resistance. This is seen particularly with its resistance to atmospheric and water influences.

    We offer a bespoke service so, if you don’t see the size or form that you require, contact us either by phone, email or our contact form below, and we will provide a solution to your requirements.