How to identify the specific material of rubber products

The hydraulic o-ring produced by our company has a variety of materials, including NBR hydraulic o-ring, fluoro rubber hydraulic o-ring, silicone o-ring, EPDM hydraulic o-ring, neoprene hydraulic o-ring, and other identification methods:
1. Medium resistant weighing test
Can be purchased from the hydraulic o-ring sampling, after determining the temperature, soak in the selected one or several media,Weigh it after a certain time , according to the rate of change in weight, hardness rate to infer the type of material.
2. Combustion method
Take samples and burn them in the air.Observe the phenomenon.Of course, if you look closely, the state of combustion, the color, the smell can also tell us a lot.For example, NBR/PVC glue, when there is a fire source, the fire is very fierce, but no fire source will self-extinguish, smoke thick and sour taste.It is important to note that sometimes halogen-free gels with added flame retardants will cause there is no fire source will self-extinguish, and this is further inferred by other means.
3. Hot air aging experiment
Take samples, put them in the aging box for one day, and observe the aging phenomenon.In order to be graded aging, you can gradually increase the temperature.For example, under 150 degrees neoprene, NR, SBR will be brittle, NBR , EPDM still have elastic.Rise to 180 degrees, ordinary NBR will be brittle;And 230 degrees, HNBR will be brittle, FKM and SIL are still very good elasticity.
4. Low temperature method
Take samples and use dry ice and alcohol to create a suitable low temperature environment.Soak the sample in low temperature for 2-5 minutes. Feel the hardness of o-rings at the selected temperature.For example, at -40?, the same high temperature and oil resistant SIL and FKM are very good contrast, SIL will be relatively soft.
5. Measure specific gravity
With precision electronic scale, plus a cup of water, a hair can be.Generally speaking, FKM has the largest proportion, more than 1.8, and CR and ECO have more than 1.3. Those with a significantly larger proportion can be considered as these rubber.
The above methods can only be used to test the composition of rubber by simple. If you want a specific test report, you need to send it to a special testing agency for testing.