As the "heart" of hydrogen fuel cell vehicle, the long-term stability and service life of the electric pile are very important. If the hydrogen fuel cell is failure in sealing functional, it will lead to hydrogen leakage, reduce the utilization rate of hydrogen, affect the efficiency of the fuel cell, and in serious cases, the battery will not work, thus affecting the battery life.

Hydrogen fuel cell sealants are mainly used between bipolar plates and membrane electrodes, and between plates and plates. It requires the following features:

• High air tightness: in order to seal hydrogen and oxygen, especially hydrogen, as a colorless, odorless, flammable and explosive small molecular gas, even a small gap, hydrogen is very easy to lead to leakage;

• Rubber elasticity: the car is often in various states of motion, with elasticity is to absorb vibration and resist impact.

There are three main production processes of hydrogen fuel cell application of sealant: Automatic injection molding, Bonded after molding of sealant, dispensing molding.

   Integrated injection molding solution:

  1. Rubber material: liquid silicone/solid silicone/traditional rubber 

  2.Product description: Metal bipolar plate/graphite bipolar plate

 3. Technical points: Automatic molding, from bipolar plate surface pretreatment, encapsulation molding, size and air tightness testing and packaging 

   Secondary bonding molding solution

   1. Rubber material: liquid silicone/solid silicone/traditional rubber 

   2. Product description: Metal bipolar plate/graphite bipolar plate

   3. Technical points：

       After the sealing gasket is molding, the sealing gasket and the bipolar plate are bonded and cured by a cold bonding process.

   Dispensing is divided into two processes：

   1. CIPG（cured in place gasket）Apply to the sealing surface to harden it before assembly. 

   2. FIPG（formed in place gasket）Apply to the sealing surface and assemble when not hardened.

  Hydrogen storage tank sealing scheme

   1. Rubber material:：PVMQ/EPDM/FKM/FVMQ 

   2. Product Description: Pressure/pressure relief valve seal ring (shaped)

   3. Technical points：Low temperature resistance (-80°C)，Low permeability.