Injection molding rubber is a combination of injection and transfer molding that Coi Rubber Products uses quite frequently to maximize the number of cavities in a given footprint.  It is commonly used within liquid injection and/or LSR molding.  Some classifications with liquid injection versus transfer injection would further provide subcategory classifications.

Injection Molding

• Perfect for large volume runs of small-to-medium size parts
• Good for intricate metal inserts, thin-wall diaphragms and similar components requiring uniform physical properties
• 300 ton to 1000 ton clamping pressure

Advantages of Injection (LSR) Molding Rubber:

• Tooling can be more complex and higher precision than compression
• Material properties created within A/B mix can have superior properties
• Process is suitable from most elastomers and cure systems
• Cycle times may be shorter reducing time while increasing efficiency
• Complete elimination of pre-forms, a labor-intensive step that can introduce variability in pre-form weight and shape resulting in variability of the finished product.

Disadvantages of Injection Molding vs. other rubber molding methods

• Labor for preforming material can add cost (however offshore manufacturing curtails this problem)
• Cycle times may be longer (additional shifts counter this problem)
• Tooling can be more complex and higher cost to construct than compression
• Higher percentage material runner scrape vs. compression molding