Rubber joint is also called in a flexible rubber joint, soft rubber joints, rubber flexible joints, soft joints, shock absorber, pipe shock absorber, suspension throat, etc.It  is a kind of high elasticity, high air tightness, medium resistance and weatherability of pipe joint.It is really hard to say when you see a rubber joint and isentify its material. Here are some of the ways to identify rubber joint quality.

1. Medium weight tolerance experiment: can be sampled from the finished product, soaked in the selected one or more of the following medium, a certain temperature time after weighing, according to the weight variation rate that sort of material hardness.In 100 oil soaked for 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 double and hardness change is very big, volume expansion is obvious.

2. The burning method: take a few samples, burning in the air.Observed phenomenon.Generally, fluorine rubber, CR, CSM from fire since the interest rates, even burning flame is much smaller than general NR, EPDM.Of course, if you look carefully, combustion state, color, smell will also provide a lot of information for us.NBR/PVC and rubber, for example, when there is fire fire waves splash, there seems to be 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 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, observed after aging phenomenon.Aging can be hierarchical gradually heating up.NR and SBR CR, such as 150 degrees will be brittle fracture, NBR EPDM and elastic.Ordinary NBR rises to 180 degrees will be 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 fluorine rubber proportion is 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.Soaked the sample 2-5 minutes in low temperature environment, feel soft and hard degree under the selected temperature.To 40 degrees, for example, the same high temperature oil resistant silicone and fluorine rubber, silicone is more soft.