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　　Ping township oil seal Small make up to tell you The quality of the rubber test methods

　　The rubber materials and products have strict quality requirements, such as tensile strength, elastic modulus, elongation, ageing resistance, etc.Rubber products used in the field of high precision, these parameters are often very tall order.

　　1 medium weight resistance experiment

　　Can sample 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 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 hot air aging test

　　From the finished product sampling, in ageing oven aging day, observed after aging phenomenon.Aging can be hierarchical gradually heating up.Such as CR under 150 ℃, NR, SBR is brittle fracture, NBR EPDM and elastic.Up to 180 ℃ under ordinary NBR is brittle fracture;Brittle fracture and also HNBR under 230 ℃, fluorine rubber and silica gel still has good elasticity.

　　3 the combustion 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.Its 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.

　　The proportion of 4 test

　　Use 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 method at low temperature

　　Sampling from the finished product, use 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.Below 40 ℃ below zero, for example, the same high temperature oil resistant silicone and fluorine rubber, silicone is more soft.