The main characteristics of the constant temperature and humidity test chamber seal
The sealing strip of the constant temperature and humidity test chamber is mainly used on the door of the box and other places where sealing is required to ensure the sealing performance during the test of the equipment. The characteristics of the sealing strip can be mainly divided into three types, namely, a vulcanized EPDM rubber sealing strip, a thermoplastic EPDM rubber sealing strip, and a modified PVC rubber strip.
Vulcanized EPDM rubber sealing strip: It is much stronger than PVC rubber strip in terms of sealing elasticity durability. However, due to the need for microwave curing line setting, the processing energy consumption is high, generally more than 20 times of PVC processing, the product can not Reuse and not environmental protection, not a product advocated by the state.
Thermoplastic EPDM rubber sealing strip: light weight, high expansion strength, no water absorption, environmental protection, simple construction, anti-seepage, leakage prevention, good water stopping effect, etc. It also has independent open-cell bubble structure, specially made type The appearance of the seam plate is evenly distributed in the honeycomb hole, and the cement/sealant can be tightly bonded and integrated without being roughened, and the natural expansion and contraction can be changed to adapt to enhance the water sealing effect of the joint sealing expansion. .
Modified PVC strip: the price is relatively low, because the quality is different, so its price is usually between 6,000 yuan / ton ~ 15,000 yuan / ton. Low-end products use scraps, substitute plasticizers, and high filling amounts, resulting in poor flexibility, hardening, squeaky, easy migration, yellowing of frame materials, and short service life.
There are many kinds of sealing strips, such as EPDM rubber, rubber and microfiber glass wool + polyurethane foam, and the material used for the sealing strip in the constant temperature and humidity chamber is the last one. The material can better function as a thermal insulation seal.
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