Medical Liquid Silicone Mask Mold

Positioning of the Mold

Medical-grade LSR masks and seals require higher air-tightness, cleanliness and batch consistency than ordinary parts. The core task is to reproduce the sealing lip that fits the face and to keep the part from yellowing or leaching over long wear.

Mold Design Highlights

• Uniform thin walls: lips are usually 0.8~1.5 mm, using ring or multi-point gating to balance flow and avoid uneven air-tightness;
• Mirror runner: polish runner and cavity to mirror level to reduce material hang-up and microbial residue for easy cleaning;
• Venting: vent inserts or vacuum venting at the nose bridge and cheek corners to eliminate trapped air in dead zones;
• Quick-change inserts: make wear-prone areas such as lips as inserts for easy maintenance and replacement, cutting downtime;
• Ejection: air or flexible ejection for soft parts to protect the sealing lip.

Process and Criteria

Mold temperature 170~200C, cure time adjusted to lip thickness. Use a whole-device negative-pressure holding test (air-tightness) as the outgoing criterion; a 3D scan of the first article is recommended for profile.

Common Defects

• Poor fit: uneven lip thickness or shrinkage; balance the runner and holding pressure;
• Edge bubbles: insufficient venting in dead corners;
• Yellowing or leaching: over-curing or raw-material cleanliness.

Delivery

Structure design, steel machining, trial and air-tightness validation, with medical-grade material certificates and first-article reports.