If you are a procurement manager sourcing custom copper components, you know that a missed detail on an RFQ (Request for Quote) doesn’t just cause a minor delay. It can derail an entire production timeline. Copper is an expensive raw material; precision isn’t just about engineering, it’s about bottom-line protection.
To get accurate pricing quickly and avoid manufacturing bottlenecks, your RFQ needs clear, objective parameters. Here is a step-by-step framework for specifying custom copper parts.
Key Takeaways
- Always call out a UNS copper grade (for example C11000 or C10100), not just “copper”.
- Tighten tolerances only on critical dimensions; over-specifying everything raises cost.
- Specify temper, surface finish and the certificates you need up front to avoid re-quotes.
1. Define the Exact Copper Grade
“Copper” is never just copper. Your drawing must call out a specific Unified Numbering System (UNS) designation. The two most common options for high-conductivity components are:
- C11000 (ETP, Electrolytic Tough Pitch): The standard choice for electrical applications. It offers 100% IACS conductivity but should not be hydrogen-brazed or welded because of the risk of hydrogen embrittlement.
- C10200 / C10100 (OF / OFE, Oxygen-Free): Essential for high-vacuum applications, semiconductor processing and intensive welding or brazing. C10100 is specified at 101% IACS conductivity.
If you are unsure which grade fits, describe the application (for example a high-current busbar, a vacuum-brazed assembly or an earthing system) and ask the manufacturer to recommend one. Our range of extruded copper rod, copper bus bars and custom copper profiles is produced from 99.99% oxygen-free copper.
2. Balance Geometric Tolerances Against Cost
Every fraction of a millimeter matters. However, over-specifying tolerances where they aren’t needed will drive up your costs.
If your part is going to be stamped or CNC machined, clarify your critical dimensions (such as hole positions or surface flatness at electrical contact points) and allow more generous tolerances on non-critical exterior cuts.
3. Specify Temper and Mechanical Properties
Copper is supplied in tempers ranging from soft annealed (O60) to half hard (H02) and hard (H04). Soft tempers bend and form easily; harder tempers hold their shape and resist deformation at bolted joints. State the required temper, or minimum tensile strength and hardness, and say whether the parts will be bent or formed after delivery.
4. Surface Plating and Finishing Requirements
Raw copper oxidizes when exposed to oxygen and humidity. If your component operates in harsh environments, your RFQ must specify the finish:
- Tin plating: Excellent corrosion resistance, and prevents galvanic corrosion when connecting copper to aluminum. See our tin-plated copper bus bars with 8-micron coating.
- Silver or gold plating: Reserved for high-frequency electronics where minimal surface resistance is paramount.
- Anti-oxidant coatings: Organic Solderability Preservatives (OSP) give temporary protection during shipping and storage.
5. Documentation and Certification
Ask for a mill test certificate (for example EN 10204 type 3.1) showing chemical composition and electrical conductivity, the product standard the material conforms to (such as ASTM B187 for bar and busbar or ASTM B152 for sheet and strip), and RoHS / REACH declarations if the parts ship to the EU. Our guide to copper certifications and ASTM / ISO standards explains what each document proves.
Copper RFQ Checklist
- Copper grade (UNS designation) and product form
- Dimensioned drawing with critical dimensions marked
- Tolerances (general and critical)
- Temper or minimum mechanical properties
- Surface finish or plating, with thickness
- Quantity, delivery schedule and packaging
- Required certificates and test reports
The Takeaway
When you approach a copper manufacturer with defined alloy grades, clear tolerance brackets and explicit finishing specs, you do more than get a fast quote. You show your team understands the material, eliminating the “risk premium” manufacturers often build into ambiguous RFQs.
Ready to source? Send your RFQ to TASA Gulf Industry with the checklist above, or browse our full copper product range.
Frequently Asked Questions
What information should a copper RFQ include?
At minimum: the copper grade (UNS number), a dimensioned drawing, tolerances, temper, surface finish or plating, quantity, delivery schedule and the certificates you require.
What is the difference between C11000 and C10100 copper?
C11000 (ETP) contains a small amount of oxygen and is the standard electrical grade at 100% IACS. C10100 (OFE) is oxygen-free, slightly more conductive at 101% IACS, and can be welded or hydrogen-brazed without embrittlement.
Which plating should I choose for copper busbars?
Tin plating is the most common choice for busbars because it resists corrosion and is compatible with aluminum connections. Silver plating is used where the lowest contact resistance is required.
