Post-Curing Processes: Why it’s Critical for FDA-Grade Silicone Gaskets.

Post-Curing Processes: Why it’s Critical for FDA-Grade Silicone Gaskets

Problem Statement

FDA-grade silicone gaskets often fail in food and pharmaceutical applications due to residual volatiles and incomplete crosslinking. These issues lead to chemical leaching, compression set failure, and reduced lifespan under cyclic sterilization at 121°C.

Material Science Analysis

Standard silicone curing processes leave behind low-molecular-weight siloxanes and unreacted curing agents. Post-curing eliminates these volatiles by extending the thermal exposure, ensuring complete crosslinking. This enhances chemical resistance, reduces compression set, and stabilizes mechanical properties.

Technical Specs

• Shore A Hardness: 50-70
• Tensile Strength: 8-10 MPa
• Elongation at Break: 300-600%
• Temperature Range: -60°C to 230°C
• Compression Set: <10% (22 hours at 150°C)

Technical Comparison

Parameter	Post-Cured Silicone	Standard Silicone	EPDM
Compression Set (%)	8	20	25
Chemical Resistance	Excellent	Good	Moderate
Temperature Range (°C)	-60 to 230	-60 to 200	-50 to 150
FDA Compliance	Yes	Partial	No

Standard Compliance

RubberQ's IATF 16949-certified processes ensure batch-to-batch consistency in post-curing. We adhere to ASTM D2000 for material callouts and ISO 3601 for sealing performance. Our quality control includes ASTM D429 adhesion testing for bonded components.

For custom material compound development or IATF 16949 documentation, consult RubberQ's engineering department.