Air-inflated expansion seals are a new type of seal made of silicone rubber with a hollow structure inside. These seals are used with compressed air sources, utilizing inflation and deflation to change the structure of the silicone rubber seal. Due to the flexibility of silicone rubber, the inflated seal is pliable. After contacting the sealing surface, it undergoes a flexible curve deformation, allowing it to seal gaps that are straight or curved in shape. Upon deflation, the seal automatically retracts to its original shape, restoring the equipment gap. They can quickly achieve sealing and unsealing, with frequent inflation and deflation capable of up to 1 million cycles. In the working state, the internal gas pressure of the body exerts a strong sealing force, resulting in high airtightness and good sealing performance. The hollow structure shape of the seal is designed according to the sealing gap size, fluid pressure, and expansion/contraction frequency. Like solid-core seals, inflatable seals can achieve radial and axial sealing for equipment.

The inflatable expansion seals are made of silicone material. Silicone can withstand high temperatures and tearing, and is unaffected by any other chemical media, except for reactions with strong acids and alkalis, making it an ideal material for inflatable sealing.