In heating elements and precision springs, a few microns or a few percent can decide whether a product performs reliably for years or fails in the field. A PTC heater needs predictable resistance from batch to batch. A spring contact has to return to the same position after thousands of flexes. A heating film has to bond cleanly and survive hot pressing without discoloring.
CIVEN Metal's High-Precision Brass Foil is made for these jobs. It is a rolled copper-zinc alloy foil with tight thickness control, stable electrical properties and consistent mechanical behavior. It is our flagship material for heating applications and precision spring components.
Key Specifications at a Glance
Parameter | Value |
Alloy grades | H65, H68, C2600 |
Thickness | 20–90 μm |
Thickness tolerance | ±1 μm |
Tensile strength | 380–520 MPa |
Resistivity | 6.5–8.0 μΩ·cm (batch deviation within ±2%) |
Hardness variation along a roll | ≤ HV5 |
Spring-back angle consistency | > 95% |
Thermal stability | No oxidation at 110°C |
Need a different thickness, temper or surface requirement? Contact our team for a custom specification.
Why Engineers Choose CIVEN High-Precision Brass Foil
1. Resistivity you can design around
For PTC heaters and electric heating films, resistivity determines heat output. We control it at the source by fine-tuning the copper-zinc ratio and testing every melt with a spectrometer. The result is resistivity held within 6.5–8.0 μΩ·cm, with batch-to-batch deviation within ±2%. Your heating elements behave the same way in every production run, which means less recalibration and fewer rejects.
2. Consistent elasticity for parts that flex every day
Terminals, spring contacts and switch springs are flexed again and again. Our foil keeps hardness variation along a roll to HV5 or less and delivers spring-back angle consistency above 95%. Stamped parts spring back the same way from the first meter of the roll to the last, which helps keep contact force stable and assembly yields high.
3. Rolled-annealed structure for fatigue resistance
Our foil is produced with a rolled-annealed (RA) process. This creates a fibrous grain structure instead of a columnar one, which improves resistance to fatigue from repeated bending. The same process also gives a smoother surface with fewer pinholes than typical brass foils, an important advantage for thin-gauge parts and laminated structures.
4. Dual surface treatment for bonding and durability
Every roll goes through degreasing followed by passivation:
<!--[if !supportLists]-->· <!--[endif]-->Degreasing: leaves a clean surface that supports strong adhesion in coating and lamination, which is essential for heating films and composite structures.
<!--[if !supportLists]-->· <!--[endif]-->Passivation: protects the foil against oxidation and discoloration during reflow soldering and hot pressing, so parts look and perform as intended after processing.
5. Micron-level thickness control
With thickness from 20 to 90 μm held to ±1 μm, the foil supports precise stamping, etching and lamination. Tight thickness control also contributes directly to consistent resistance and spring performance.
Applications
High-Precision Brass Foil serves a wide range of industries:
<!--[if !supportLists]-->· <!--[endif]-->Heating elements: PTC heating elements, electric heating films, thermostatic heaters, automotive seat heaters
<!--[if !supportLists]-->· <!--[endif]-->Precision springs and connectors: terminals, spring contacts, switch springs, EMI shielding cans
<!--[if !supportLists]-->· <!--[endif]-->Automotive electronics: PCB shielding cans, sensor housings, ECU structural parts
<!--[if !supportLists]-->· <!--[endif]-->Heat exchange: heat sink fins, air-conditioning heat exchanger strip, vapor chamber substrates
<!--[if !supportLists]-->· <!--[endif]-->Musical instruments and acoustics: brass instrument reeds, acoustic diaphragms, audio accessories
<!--[if !supportLists]-->· <!--[endif]-->Decorative hardware: nameplates, appliqués, musical instrument parts, craft inlays
Quality You Can Verify
CIVEN Metal operates under quality systems certified to ISO 9001 and IATF 16949, and our brass foil complies with RoHS. Every shipment comes with a Certificate of Analysis (COA) and an SGS test report, and every batch is fully traceable from melt to delivery. For automotive and electronics customers, this documentation simplifies supplier qualification and incoming inspection.
Flexible Supply and Fast Delivery
We know development projects and production programs have different needs:
<!--[if !supportLists]-->· <!--[endif]-->Flexible order sizes: from tens of kilograms for prototyping to several tons for mass production
<!--[if !supportLists]-->· <!--[endif]-->Fast lead times: 7 days for standard specifications, 48 hours for custom samples
<!--[if !supportLists]-->· <!--[endif]-->Free sample books: so your team can evaluate the material before ordering
<!--[if !supportLists]-->· <!--[endif]-->Vacuum-packed export packaging: to protect the foil surface during international shipping
Technical Support from Selection to Production
Our engineers work alongside your team at every stage. We help you choose the right alloy grade and thickness, adjust stamping, lamination or heat-treatment parameters, and carry out failure analysis if problems appear in the field. Our goal is not only to supply foil, but to help your product perform reliably.
Request a Sample or Quote
Looking for a brass foil that delivers stable resistivity, consistent spring-back and a clean, bondable surface? Contact CIVEN Metal today for free samples, a technical datasheet or a quotation.
CIVEN Metal
Address: Workshop 2-2, No. 1888 Xiechun Road, Jiading District, Shanghai, China
Tel: +86 21 5635 1345
Email: sales@civen.cn