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Beryllium Copper C17200 Foil Manufacturer and Supplier in India

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Beryllium Copper C17200 Foil is an ultra thin, age-hardenable copper alloy product developed for precision components that need to be strong, flexible, conductive and have high fatigue resistance. Also known as Alloy 25, CDA 172, CuBe2, and DIN 2.1247, it contains approximately 1.80% to 2.00% beryllium. Manufactured to ASTM B194 and ASME SB194, C17200 foil can be supplied in micro-gauge thicknesses from 0.0025 mm up to 0.10 mm suitable for demanding electronic and industrial applications. In the TH04 temper it reaches a tensile strength of about 1450 MPa, with a minimum electrical conductivity of 22% IACS. Sachin Steel is a reliable and top supplier of Beryllium Copper C17200 Foil and all other Copper Alloy materials in different tempers and precision rolled forms.

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Table Of Content

Technical Data

Specifications of Beryllium Copper C17200 Foil

Parameter

Specification Details

Alloy Grade

UNS C17200, Alloy 25, CDA 172, ISO CuBe2, DIN 2.1247

Governing Standards

ASTM B194, ASME SB194 (Plate, Sheet, Strip, and Rolled Bar); ASTM B248 (General Tolerances)

Beryllium Content

1.80% to 2.00%

Thickness Range

0.0025 mm (0.0001 in) to 0.10 mm (0.004 in)

Coil Widths

10 mm, 25 mm, 50 mm, 100 mm, up to 200 mm custom slit width options

Gauge Tolerances

Gauge tolerance per ASTM B248 precision tables, typically plus or minus 2 percent on heavier foil gauges (confirm per gauge with the mill)

Tempers Available

Solution Annealed (TB00/A), Cold Rolled (TD01 to TD04/H), Age Hardened (TF00/AT, TH04/HT)

Surface Finish

Bright annealed, smooth, clean, grease-free surface suitable for chemical etching or plating

Density

Annealed: 8.25 g/cm³ (0.298 lb/in³). Age hardened: 8.36 g/cm³ (0.302 lb/in³)

Certification

EN 10204 3.1 Mill Test Certificate with complete chemical and mechanical traceability

Chemical Composition of Beryllium Copper C17200 Foil

Element

Minimum (%)

Maximum (%)

Beryllium (Be)

1.80

2.00

Cobalt + Nickel (Co + Ni)

0.20

—

Cobalt + Nickel + Iron (Co + Ni + Fe)

—

0.60

Iron (Fe)

—

0.10

Silicon (Si)

—

0.20

Aluminium (Al)

—

0.20

Lead (Pb)

—

0.02

Copper (Cu)

Balance

Balance

Mechanical Properties of Beryllium Copper C17200 Foil

Temper Code

Condition Label

Tensile Strength (MPa / ksi)

0.2% Yield Strength (MPa / ksi)

Elongation in 50 mm (%)

Hardness

TB00

Solution Annealed (A)

410 to 540 / 60 to 78

190 to 275 / 28 to 40

35 to 60%

HRB 45 to 78

TD01

Cold Rolled (1/4 H)

515 to 650 / 75 to 94

415 to 550 / 60 to 80

10 to 35%

HRB 75 to 88

TD02

Cold Rolled (1/2 H)

585 to 725 / 85 to 105

515 to 650 / 75 to 94

5 to 25%

HRB 88 to 96

TD04

Cold Rolled Full Hard (H)

690 to 830 / 100 to 120

510 to 620 / 74 to 90

2 to 10%

HRB 96 to 102

TF00

Annealed + Age Hardened (AT)

1140 to 1345 / 165 to 195

960 to 1170 / 140 to 170

3 to 10%

HRC 36 to 41

TH04

Hard + Age Hardened (HT)

1310 to 1550 / 190 to 225

1100 to 1310 / 160 to 190

1 to 4%

HRC 41 to 45

Physical Properties of Beryllium Copper C17200 Foil

Physical Property

Metric Value

Imperial Value

Density (annealed)

8.25 g/cm³

0.298 lb/in³

Density (age hardened)

8.36 g/cm³

0.302 lb/in³

Melting Range

865°C to 980°C

1590°F to 1800°F

Modulus of Elasticity (Tension)

128 GPa

18.5 × 106 psi

Poisson’s Ratio

0.30

0.30

Electrical Resistivity (Heat Treated)

7.81 microhm·cm

7.81 microhm·cm

Electrical Conductivity (annealed)

15% to 19% IACS

15% to 19% IACS

Electrical Conductivity (aged)

22% IACS minimum

22% IACS minimum

Thermal Conductivity (20°C)

105 W/m·K

60.7 BTU/ft·h·°F

Coefficient of Thermal Expansion (20–200°C)

17.0 × 10−6 /°C

9.4 × 10−6 /°F

Magnetic Permeability

Below 1.004 (virtually non magnetic)

Below 1.004

Equivalent Grades of Beryllium Copper C17200 Foil

Country / Standard System

Alloy Designation

Flat Product Standard

USA (UNS / CDA)

UNS C17200 / CDA 172 / Alloy 25

ASTM B194, ASME SB194, ASTM B248

International (ISO)

CuBe2

ISO designation CuBe2

European Union (EN)

CuBe2 / CW101C

EN 1654 (Strip for Springs & Connectors), EN 1652

Germany (DIN)

CuBe2 / 2.1247

DIN 17666

Japan (JIS)

C1720

JIS H3130 (copper beryllium alloy sheets and strips for springs)

United Kingdom (BS)

CB101

BS 2870 (Sheet, Strip & Foil)

China (GB)

QBe2

GB/T 5231

Russia (GOST)

BrB2

GOST 18175

Size Chart of Beryllium Copper C17200 Foil

Thickness (mm)

Thickness (inches)

Weight (kg/m²)

Weight (lbs/ft²)

0.0025 mm

0.0001 in

0.02 kg

0.004 lbs

0.0127 mm

0.0005 in

0.10 kg

0.021 lbs

0.0254 mm

0.0010 in

0.21 kg

0.043 lbs

0.0381 mm

0.0015 in

0.31 kg

0.064 lbs

0.0508 mm

0.0020 in

0.42 kg

0.086 lbs

0.0762 mm

0.0030 in

0.63 kg

0.129 lbs

0.1016 mm

0.0040 in

0.84 kg

0.172 lbs

Application and Industrial Uses of Beryllium Copper C17200 Foil

  • EMI/RFI Shielding Gaskets
  • Electronic Connector Contacts
  • Precision Relay Components
  • MEMS Sensor Components
  • Acoustic Diaphragms
  • Photochemical Etching Components
  • Battery Contact Springs
  • Aerospace Electrical Components
Application Industries

Frequently Asked Questions

Beryllium Copper C17200 Foil is a high-strength, age-hardenable copper alloy foil offering excellent conductivity, fatigue resistance, and spring properties.

UNS C17200 is also known as Alloy 25, CDA 172, CuBe2, and DIN 2.1247.

C17200 Beryllium Copper Foil is commonly manufactured according to ASTM B194 and ASME SB194.

Yes, C17200 Foil can be precipitation hardened through solution treatment and aging to increase strength and hardness.

Yes. C17200 is virtually non magnetic, with a permeability below 1.004, which suits sensors and precision electronics.

Yes. Foil is stamped, formed and photochemically etched in the solution annealed temper, then age hardened. Handle thin gauges with care to avoid creasing, and confirm the minimum bend radius for your gauge.

Sachin Steel Centre supplies C17200 foil from 0.0025 mm (confirm) up to 0.10 mm in coil and cut lengths. Confirm the minimum gauge and width for your order with our team.

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