thickness of 4mm
The size of sealing is 500mm and the height of upper cover is 90mm.
Pump: domestic vacuum pump with high vacuum degree, long service life and stable quality
The electrical box is water-proof, moisture resistance and rat-proofing.
The control panel is computer board which is water-proof, moisture resistance and high degree of automation.
The heating device is new and the air cylinder drives the vacuum pump, so it is energy-saving and environment protection.
The natural silicon ge