If you work in injection molding, you know how critical the choice of mold insert material is. The right copper alloy can improve cooling efficiency, extend mold life, and reduce cycle times. The wrong one leads to wear, warping, and higher production costs.
 
When it comes to mold applications, beryllium copper is often the top choice, and two grades stand out: C17200 and C17500. Let’s break down which one you should use for your molds.
 
Why Beryllium Copper for Molds?
 
Before comparing grades, let’s recap why beryllium copper is so popular in mold making:
1. High thermal conductivity: It cools parts faster, cutting cycle time by 10–20%
2. Excellent hardness: Resists wear and deformation even under repeated molding cycles
3. Good corrosion resistance: Withstands moisture and plastic additives
4.High dimensional stability: Maintains precision over long production runs
 
Which Grade to Choose: C17200 or C17500?
 
C17200 Beryllium Copper (High-Strength Grade)
 
This is the first choice for most mold inserts.
 
- Hardness: HRC 38–44 (one of the hardest copper alloys)
- Best for: High-stress inserts, core pins, slides, and areas subject to wear
- Advantages: Long service life, excellent wear resistance, high stability under pressure
- Perfect for: High-volume production molds, complex inserts, and parts with thin walls
 
C17500 Beryllium Copper (High-Conductivity Grade)
 
If your main goal is cooling efficiency, this is the better pick.

- Conductivity: 45–55% IACS (nearly double C17200)
- Best for: Cooling inserts, hot runner components, and parts where heat dissipation is critical
- Advantages: Faster heat transfer, shorter cycle times, good formability
- Perfect for: Large molds, thick-walled parts, and applications requiring fast cooling
 
Quick Decision Guide
 
If your priority is… Choose… 
Maximum hardness & wear life C17200 
Fast cooling & short cycle time C17500 
High-volume production molds C17200 
Cooling inserts / thermal management C17500 
 
Our Supply for Mold Applications
 
We supply both grades in ready-to-use forms:
 
- C17200 beryllium copper bars and plates for mold inserts
- C17500 beryllium copper blocks for cooling inserts
- Custom cut sizes to match your mold specifications
- Material certifications (Mill Test Reports) available
 
If you’re unsure which grade fits your mold design, feel free to send us your requirements. We’ll help you select the right material to optimize performance and cost.