C17200 Beryllium Copper Tape – Precision Rolled for EMI Gaskets Compliant with ASTM B194

C17200 beryllium copper tape represents the highest-performance wrought copper alloy format for applications demanding sub‑millimeter thickness combined with exceptional spring properties. As a precipitation‑hardened Cu‑Be alloy (UNS C17200 / Alloy 25 / DIN 2.1247), this beryllium copper tape achieves tensile strengths above 1380 MPa after age hardening—outperforming any other copper‑based alloy on the market—while retaining 22‑30% IACS electrical conductivity, non‑magnetic behavior (permeability < 1.01), and outstanding corrosion resistance comparable to pure copper. Produced via precision rolling under ASTM B194, SAE J461/J463, RWMA Class 4, and AMS 4533 specifications, the tape form allows continuous coil lengths exceeding 30 feet with thickness tolerances as tight as ±0.005 mm, enabling high‑volume blanking for EMI shielding fingers, micro‑switch springs, battery contacts, and hermetic connector blades. Unlike strip products requiring secondary slitting for narrow widths, this beryllium copper tape is directly rolled to final width (2 mm–350 mm) with deburred or rounded edges, eliminating downstream processing steps. Available in tempers ranging from dead‑soft annealed (A) for complex forming to mill‑hardened (AT/HT) for immediate spring function without post‑heat treatment, the tape delivers stress relaxation resistance up to 200 °C, fatigue endurance exceeding 10⁷ cycles at 40 ksi reverse bending, and dimensional stability essential for miniaturized electromechanical systems. The following technical dataheet confirms conformance to global standards and provides engineering‑grade metrics for design validation and procurement qualification.

Standards & Conformance

Beryllium copper tape is manufactured and certified to meet the following internationally recognized standards:

*Additional cross‑references: QQ‑C‑533 (federal), GOST 15835 / 1789 (Russian strip & sheet). Mill test certificates to EN 10204 3.1, 3.2, or certified AMS 4533 batch traceability available.*

Chemical Composition

The nominal chemical composition of beryllium copper tape per UNS C17200 (Alloy 25 / CuBe2 / DIN 2.1247) is presented below. Limits reflect ASTM B194 and Materion (formerly Brush Wellman) production standards.

Note: Composition validated by ICP‑OES per ASTM E1473; each coil supplied with certified chemical verification.

Mechanical Properties (by Temper)

Mechanical performance of beryllium copper tape varies strongly with temper and post‑forming age‑hardening treatment. The values below consolidate data from AZoM (UNS C17200), MatWeb (Materion Alloy 25 Strip), Robert Laminage CuBe2, and eFunda.

Key supplementary mechanical indicators:

Physical Properties

The following table summarizes the intrinsic physical parameters of beryllium copper tape (C17200 / Alloy 25) in the age‑hardened state unless otherwise noted. Values are compiled from ESPI Metals, AZoM, Robert Laminage, and NGK Berylco physical data sheets.

*Electrical conductivity referenced to International Annealed Copper Standard (IACS = 58 MS/m at 20 °C). Values for solution‑annealed tape are ~15‑18% IACS before aging.*

Key Selling Points by Region

Our beryllium copper tape provides distinct value propositions for buyers across different global markets:

• South Asia & Southeast Asia (India, Vietnam, Thailand, Malaysia, Singapore) : Electronics manufacturing hubs drive demand for precision‑rolled beryllium copper tape in 0.05‑0.30 mm thickness, mill‑hardened AT (TF00) temper, for SIM card contacts, battery springs, and micro‑switch blades. Local importers prioritize JNPT port logistics (Mumbai) and competitive coil weights (50‑500 kg) to minimize per‑unit landed cost. India's BIS certification and ASEAN tariff exemptions available.

• Middle East (UAE, Saudi Arabia, Kuwait, Qatar) : Oil & gas and petrochemical safety applications require beryllium copper tape for non‑sparking tools, downhole MWD/LWD housings, drill bit bearings, and pressure switch diaphragms. Non‑magnetic (µr < 1.01) and anti‑galling properties prevent spark ignition in explosive atmospheres—critical for ATEX‑classified refinery maintenance and petrochemical plant tooling. Strip/tape format preferred for rolled beryllium copper wear plates in heavy mining equipment operating across GCC.

• Europe (Germany, France, UK, Italy, Spain, Poland) : European engineering demands beryllium copper tape with full REACH and RoHS compliance for EV battery connectors (800 V systems), automotive sensor contacts, and high‑current relay components. German automotive tier‑1 suppliers require IATF 16949 traceability with PPAP Level 3 documentation. Sustainability declarations (carbon footprint per kg of alloy 25 tape) available upon request.

• North & South America (USA, Canada, Mexico, Brazil) : Aerospace applications (AMS 4533) drive procurement of beryllium copper tape in non‑magnetic, high‑fatigue configurations for aircraft instrumentation housings, landing gear anti‑galling bushings, and avionics connector shells. U.S. domestic end‑users require DFARS‑compliant certified mill lots with full DOT‑classified hazardous material (beryllium) safety data sheets. Brazilian market additionally emphasizes local test certification (INMETRO) and Mercosur origin documentation.

• Africa (Nigeria, South Africa, Angola) : Mining and mineral processing operations specify beryllium copper tape for heavy‑equipment wear plates and non‑sparking pumps, where abrasion resistance and corrosion resistance in acidic mine water (pH 2‑4) are decisive factors. South African import controls require pre‑shipment inspection via SGS or Bureau Veritas for “high‑strength precision alloy tape” customs classification.

• Global Maritime & Offshore : Seawater corrosion resistance comparable to nickel‑silver makes beryllium copper tape the material of choice for deep‑sea ROV connector housings and offshore platform electrical panels. Zero susceptibility to hydrogen embrittlement and hydrostatic pressure tolerance (to 3,000 m depth equivalent) ensure long service life in underwater environments, with marine certifications (ABS, DNV) available.

Primary Applications

C17200 beryllium copper tape serves mission‑critical functions across the following industries and components:

Available Forms & Dimensions

Beryllium copper tape is available in the following specifications:

Available Tempers & Heat Treatment Guide

*Post‑age hardening (customer performed): Solution anneal 790 °C×5 min, water quench, age 315 °C×2‑3 h in vacuum or inert gas to achieve TH01/TF00 properties.*

Frequently Asked Questions (FAQ)

Q1: What distinguishes beryllium copper tape from beryllium copper strip?

“Beryllium copper tape” is functionally identical in chemistry and properties to C17200 strip (ASTM B194) but typically refers to narrower widths (< 100 mm) and/or thinner gauges (< 0.3 mm) intended for high‑speed stamping of miniature components. Tape often implies continuous coiled lengths with precision edge finishing (deburred or radius‑edged) suitable for direct feed into automatic punch presses without secondary slitting. Some vendors use “tape” for ultra‑thin (≤ 0.1 mm) conductive spring stock, but the underlying alloy C17200/cube2 metallurgy is identical.

Q2: What is the maximum continuous length available for EMI finger stock gaskets?

Beryllium copper tape for EMI finger gaskets can be supplied in continuous coils up to 35 feet (10.7 m) in a single uninterrupted length, avoiding splices that cause stamping tool damage. Standard finger strip lengths are 16‑24 inches, but continuous‑coil stock enables automated high‑volume gasket production with minimal material waste and no joint‑related scrap.

Q3: Is beryllium copper tape magnetic?

No. Beryllium copper tape exhibits a magnetic permeability of less than 1.01, making it effectively non‑magnetic. This property is critical for high‑precision instruments (MRI housings, aerospace gyroscopes, naval navigation equipment) where magnetic interference must be eliminated. Unlike ferromagnetic stainless steel grades, beryllium copper shows no magnetic attraction even after extensive plastic deformation during stamping or rolling operations.

Q4: How does temperature affect beryllium copper tape performance?

Beryllium copper tape maintains stable spring properties up to 200 °C (392 °F). Above 200 °C, gradual overaging reduces tensile strength (stress relaxation rates increase exponentially above 250 °C). The alloy exhibits excellent stress relaxation resistance—retaining > 90% of initial contact force after 1,000 hours at 150 °C—significantly outperforming phosphor bronze (C5191) or beryllium‑nickel alternatives. For continuous service above 250 °C, consider C17510 (CuNi2Be, 45‑60% IACS, lower strength but higher conductivity).

Q5: What safety precautions are required when processing beryllium copper tape?

Solid beryllium copper tape poses no inhalation hazard in coil or stamped part form. However, during grinding, sanding, polishing, welding brazing that generates airborne dust or fume, beryllium‑containing particles may be released. Standard industrial hygiene practices must be followed: use local exhaust ventilation (LEV), wear P100 or HEPA‑filtered respirators (APF≥10), avoid dry sweeping of dust. Processors must comply with OSHA 29 CFR 1910.1024 (beryllium) and ACGIH TLV of 0.05 μg/m³ (8‑hour TWA). Wet machining (water‑based coolant mist control) and HEPA vacuum cleanup are strongly recommended.

Q6: Can beryllium copper tape be welded? What methods work?

Yes. Beryllium copper tape can be joined using resistance spot welding (most common for tape‑to‑tape overlaps), TIG, laser welding, soldering, and brazing. Key considerations:

• Resistance spot welding : Best for tape thickness 0.1‑0.5 mm; use RWMA Class 2 electrodes, moderate force (100‑150 N), short weld time (2‑4 cycles) to minimize heat‑affected zone overaging.

• Soldering / brazing : Preferred for electrical connections; use Sn95/Ag5 solder (eutectic) or Flux‑coated silver braze (AWS BAg‑8a) with localized torch heating (brazing temperature ≤ 760 °C). Avoid prolonged heating above 800 °C to prevent incipient melting.

• Pre‑weld aging : For HT/AT tempers, local annealing occurs in the HAZ—post‑weld re‑aging at 315 °C for 2 h restores near‑original strength.

• Filler metal : AWS ERCuBe‑A or ERCuBe‑Al for matched composition and corrosion resistance.

Q7: How do I choose between C17200 beryllium copper tape and other beryllium‑copper alloys?

Use C17200 beryllium copper tape when maximum spring force in minimal thickness is required. Use C17510/C17500 when welding, heat dissipation, or > 45% IACS conductivity outweighs peak strength.

Q8: What safety testing or certifications are available?

Mill test certificates (MTCs) according to EN 10204 Type 3.1 (standard) or 3.2 (with third‑party verification) are standard. Available certifications include:

• ASTM B194 mill certification with temper verification

• AMS 4533 (aerospace) with batch traceability to melt source

• DFARS (U.S. defense) compliance for raw material origin

• REACH / RoHS declaration (Europe)

• IATF 16949 (automotive) process certification

• PPAP Level 3 documentation for automotive tier‑1 qualification

• ABS/DNV marine certification (upon pre‑order request)

• NACE MR0175 / ISO 15156 statement for oil & gas sour service

Q9: What thickness tolerances can be held on ultra‑thin (<0.1 mm) tape?

Thickness tolerance on beryllium copper tape below 0.1 mm follows:

• 0.015‑0.025 mm: ±0.0025 mm (±2.5 μm)

• 0.025‑0.050 mm: ±0.004 mm (±4 μm)

• 0.050‑0.100 mm: ±0.005 mm (±5 μm)

• 0.100‑0.300 mm: ±0.008 mm (±8 μm)

Tolerances refer to nominal thickness measured at centerline (ASTM B194 / EN 1654 Class B). Edge thinning may occur on widths > 200 mm; consult for your specific width/gauge combination.

Q10: Does beryllium copper tape require post‑forming heat treatment?

It depends on the starting temper. Annealed (A / TB00) tape requires customer‑performed age hardening after forming to achieve full strength: solution anneal 790 °C × 4‑5 minutes, water quench, age 315 °C × 2‑3 hours, air cool—this yields final hardness of 35‑40 HRC. Mill‑hardened (AT / HT) tape is fully aged at the mill and provides spring properties immediately after stamping (no post‑heat required). Most high‑volume customers specify AT temper to skip post‑processing and reduce per‑part cost.

Q11: What are the European equivalents of C17200 beryllium copper tape?

European designation CW101C (EN) or CuBe2 (DIN 2.1247) is fully equivalent to UNS C17200. In French standards, “CuBe1.9” is also common. German specification 2.1247 is widely accepted for aerospace and automotive spring applications. Russian grade BrB2 (БрБ2) mirrors C17200 composition. Certification to EN 10204 3.1 or 3.2 ensures acceptance across EU manufacturing.

Q12: Does beryllium copper tape meet RoHS and REACH for European import?

Yes. Beryllium copper alloy (C17200 / CuBe2) is not currently restricted under RoHS Directive 2011/65/EU (recast). However, REACH Regulation (EC) No 1907/2006 requires downstream user notification of beryllium content as a Substance of Very High Concern (SVHC) only when intentionally released. Standard mill test certificates for EU‑bound shipments include RoHS compliance statements for lead (< 0.01%), cadmium (< 0.01%), Mercury (0%), and hexavalent chromium (0%). European buyers should request an Article 33 SVHC disclosure if components contain > 0.1% beryllium by weight (C17200 nominally 1.9% Be) and are supplied directly to EU consumers—industrial end‑users are generally exempt.

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