The way to distinguish the quality of the rubber joint material.

Flexible rubber joint and soft rubber joints, rubber joints, soft rubber joints, can be flexible rubber joint, high pressure rubber joints, rubber shock absorber, compensator, etc.Look from the exterior, rubber joint looks the difference is not big, but the internal quality decides the service life of the rubber joint.So, good rubber joint is very important, must learn to identify the method of rubber joint.
1. Medium weight tolerance experiment: can be sampled from the finished product, soaked in the selected one or more of the following medium, weighing, constant temperature time after. According to the types of weight rate hardness rate that in 100 degrees oil soaked in 24 hours, for example, NBR, fluorine rubber, ECO, CR quality and hardness of the rate of change is very small, and NR, EPDM, SBR weight more than doubling and hardness change is very big, volume expansion is obvious.
2. The burning method: take a few samples, burning in the air. Observe phenomena. Generally, fluorine rubber, CR, CSM from fire since the interest rates, even burning flame than normal NR, EPDM is much smaller. Of course, if you look carefully, the combustion state, color, smell will also provide a lot of information for us. Such as NBR/PVC with glue, when there is fire fire waves splash, seems to have the water, from self-extinguishing fire, smoke concentration and acidity. It's important to note that sometimes add flame retardant but do not contain halogen glue will be from self-extinguishing fire, this is to use other way further inferences.
3. The hot air aging experiments: from the finished product sampling, in ageing oven aging day, observe the aging phenomenon. After aging can be hierarchical gradually warming. CR, such as 150 degrees NR and SBR is brittle fracture, NBR EPDM and elastic. Ordinary NBR will rise to 180 degrees brittle fracture.HNBR and 230 degrees will be brittle fracture, fluorine rubber and silica gel still has good elasticity.
4. Measure: the proportion of using electronic said or analytical balance, accurate to 0.01 grams, plus a glass of water, a human hair. In general the proportion of fluorine rubber, the largest 1.8 above, CR ECO proportion is more than 1.3 in more obvious big can consider is the glue.
5. Low temperature method: sample from the finished product, with dry ice and alcohol making an appropriate low temperature environment. The samples in low temperature environment 2-5 minutes, feel soft and hard degree at selected temperatures. - 40 degrees, for example, the same high temperature oil resistant silicone and fluorine rubber, silicone is more soft.