How to check the quality of the rubber sheet?

1. Rubber weight-resistant media weight gain experiment:
Samples can be taken from the finished product, soaked in one or more of the selected media, weighed after a certain temperature time, and the type of material is inferred from the rate of change in weight hardness. For example, soaked in 100-degree oil for 24 hours, NBR, fluoroglue, ECO, CR mass and hardness change rate is very small, and NR, EPDM, SBR weight gain more than double and hardness change is very large, volume expansion is obvious.

2. Hot air aging experiment:
Sample from the finished product, place it in an aging box for a day, and observe the phenomenon after aging. It can be graded aging gradually heating up. For example, CR, NR, SBR will be brittle at 150 degrees, and NBR EPDM will have elasticity. Normal NBRs will break at 180 degrees, while HNBrs at 230 degrees will be brittle, and fluoroglue and silicone will still have good elasticity.

3. Burning method:
Take a little sample, burn in the air, observe the phenomenon. In general, fluorine, CR, CSM from the fire, even if the fire seedlings are much smaller than the general NR, EPDM. Of course, if you look closely, the burning state, color, smell will also provide us with a lot of information. For example, NBR/PVC and glue, there is a source of fire when the fire crackling splash, it seems to have water-like, from the fire, smoke thick and sour taste. It is important to note that sometimes adhesives with flame retardants but halogen-free are also self-contained, which can be further inferred by other means.

4. Measurement of gravity:
With electronic name or analysis of the balance, accurate to 0.01 grams of you, plus a glass of water, a hair wire can be. Generally speaking, the largest proportion of fluorine, 1.8 or more, CR ECO is also more than 1.3 or more proportion significantly larger can be considered to be these glues.

5. Cryogenic method:
Sample from the finished product and create a suitable low temperature environment with dry ice and alcohol. Soak the sample at low temperatures for 2-5 minutes to feel the soft and hard at the selected temperature. For example, under -40 degrees, the same high temperature and oil resistance is very good silicone and fluoroglue comparison, silicone is relatively soft.

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