Copper Strip｜High Conductivity and Smooth Surface for Mold and Electronics Applications

Key Industry ChallengesIn mold manufacturing, electrical devices, and electronic component production, dimensional accuracy and electrical conductivity of materials are critical to ensuring product quality. However, many factories still encounter issues such as inconsistent conductivity, uneven sheet surfaces causing poor contact during assembly, and heat accumulation during operation or forming. These factors reduce electrical efficiency, increase dimensional deviation, and drive up production costs unnecessarily.

Root Cause of the Problem

Most standard copper sheets in the market lack strict quality control especially during precision rolling and annealing processes. This results in inconsistent hardness, wavy or oxidized surfaces, and reduced conductivity due to metal contamination. These issues directly impact electrical resistance, heat dissipation, and part precision especially in EDM operations, electrical components, and molds requiring high accuracy.

The Solution: Japanese-Grade Industrial Copper Sheet from Yamaichi

Yamaichi Special Steel (Thailand) offers high-quality industrial copper sheets manufactured and quality-controlled to Japanese standards. Each sheet undergoes precision rolling and controlled annealing, making them ideal for applications requiring superior electrical, thermal, and dimensional performance such as electrodes, EDM molds, bus bars, and electronic components.

Features of YAMAICHI Copper Sheets

1. C1100 – Pure Copper Sheet

• Copper purity over 99.9% Cu
• Electrical conductivity: 100% IACS (International Annealed Copper Standard)
• Thermal conductivity: ~390 W/m·K
• Base hardness: HV 50–100 (depending on annealing condition)
• Smooth surface, easy to form and solder
• Ideal for: EDM electrodes, bus bars, electrical conductors, thermal transfer systems

2. C2801 – Brass Sheet

• Composition: ~60% Cu, ~40% Zn
• Base hardness: HV 80–130
• Electrical conductivity: ~30% IACS
• Higher strength and flexibility than pure copper, with good wear and corrosion resistance
• Ideal for: Metal molds, washers, spacers, and decorative components

Key Advantages of Yamaichi Copper Sheets

• Japanese quality standards under ISO 9001:2015
• Consistently high electrical conductivity through controlled annealing processes
• Mirror surface finish – ready for use in molds and electrode applications
• Cut-to-size and precision grinding services available (±0.1 mm)
• In-stock and ready to ship in Thailand – supports urgent and continuous production needs

※ For more details, please download the brochure or contact us.

Glossary

• IACS (International Annealed Copper Standard): A benchmark for measuring copper’s electrical conductivity (100% IACS = pure copper)
• Annealing: A heat treatment process that relieves internal stress, improves ductility, and restores metal structure
• Mirror Surface Finish: Polished to a reflective surface for improved electrical contact performance
• Bus Bar: A metallic conductor bar used in power systems or machinery to distribute electric current

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