How to distinguish seals

With the increasingly fierce competition in the market, everybody has used various means to obtain their own profits. Nowadays, most of the bad products on the market cause great problems for consumers, and they say that building doors and windows seals are good. How to identify the bad, with the continuous rise of various petrochemical products, there are many businesses starting from the raw materials to save costs, shoddy, the market is generally used EPDM sealing material more, unscrupulous business use In the raw rubber instead of the original glue sold to consumers, the product produced by reclaimed rubber Sanyuan B has poor anti-aging ability, and the stretch resilience will drop from 7.72 MPA to 3.48 PMA, which will give the mechanical switch of doors and windows elasticity due to stretching. Decreasing the service life of doors and windows, you can pass

The following four ways to identify it is good or bad.
(1) Touch: See how soft it is by touching it with your hand.
(2) Smell: Does the smell smell stinky?
(3) Look: See if the surface is smooth with or without bubbles and a small cross-section on the street.
(4) Pull: whether there is a rebound in the stretch, pull it to a certain length to see if it can rebound completely.
The EPDM sealing strips that reach the national standard are difficult to buy on the market. It has been reported by the media that there is only one sealing strip manufacturer in Beijing that can meet the national standard. It is a sealing system that integrates production, R&D, and production into the national standard.