Characteristics of materials commonly selected for anesthesia masks

Anesthesia masks play a pivotal role in the medical field and consist of two main components: the mask shell and the air cushion. The rigid shell is typically made of transparent hard plastic (such as PP or PC), while the soft cushion that contacts the face—also known as the sealing cushion—is the component where material composition varies most significantly.

 

I. Medical-grade silicone masks (cushion material: Liquid Silicone Rubber/LSR; manufacturing processes: slush molding/injection molding)

1. Positioning: High-end; mainstream material for reusable masks.
2. Manufacturing processes: Slush-molded silicone (most common), liquid silicone injection molding.

3. Material: Silicone rubber, plasticizer-free; meets ISO 10993 and USP Class VI biocompatibility standards.

 

4. Clinical Features:
- Excellent elasticity and resilience; it springs back quickly after compression and maintains a secure facial seal over extended periods without collapsing or leaking air;
- Soft to the touch with minimal facial pressure; reduces pressure marks and skin irritation during prolonged surgeries (over 2 hours);
- Wide temperature tolerance (-55°C to 200°C); compatible with various sterilization methods—including 121°C autoclave (steam), EO, low-temperature plasma, and irradiation—allowing for repeated disinfection and reuse;
- Remains flexible in low-temperature environments; suitable for emergency care and low-temperature operating rooms;
- Extremely low allergenicity; suitable for newborns, pediatric patients, and individuals with sensitive skin.

 

5. Disadvantages: High raw material costs; standard silicone is translucent, while high-transparency silicone is more expensive to produce.

 

II. Medical-grade soft PVC masks (DEHP-free/phthalate-free PVC; primary manufacturing process: blow molding)

 

1.Market Positioning: Standard material used globally for disposable anesthesia masks
2.Manufacturing Process: Blow molding (the industry-standard process for disposable PVC air-cushion masks)
3.Composition: PVC resin + eco-friendly plasticizer for softness.

 
4.Clinical Features:
- High transparency and visibility of the mask cushion, allowing medical staff to easily observe oral and nasal secretions;
- Low-cost raw materials, suitable for mass production as a disposable consumable;
- Soft texture, meeting sealing and ventilation requirements for short-duration surgeries (within one hour).

 
5.Disadvantages:
- Has almost no resilience; prone to permanent collapse or deformation under prolonged compression; hardens in low temperatures.
- Not heat-resistant; autoclaving is prohibited; compatible only with ethylene oxide (EO) sterilization; intended for single use only; repeated sterilization is strictly forbidden.
- Carries a risk of plasticizer migration during prolonged facial contact; unsuitable for long-duration anesthesia or neonatal intensive care.

 

III. Supplementary Note: Medical-Grade TPE (Emerging Alternative Material)

 

This material offers a novel solution for small and medium-sized manufacturers, balancing the cost advantages of PVC with eco-friendly properties; it is plasticizer-free and suitable for one-piece molding. Currently, procurement volumes by top-tier (Grade 3A) hospitals remain lower than those for PVC and silicone; it is primarily used for economical nebulizer masks and simple resuscitation masks, with limited application in high-end anesthesia masks.