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How to identify the specific material of rubber products

返回列表 Source: Cixi Haisheng Rubber Products Co., Ltd. Date 2018-10-19 15:26 Browse: -

O型圈有多种材质,有丁晴O型圈氟胶O型圈硅胶O型圈三元乙丙O型圈氯丁O型圈等等,那么如何让来鉴别这些材质呢? There are many kinds of O-rings produced by our company , including Ding Qing O-rings , fluorine rubber O-rings , silicone O-rings , EPDM O-rings , neoprene O-rings, etc. What about these materials?

1.Medium weight resistance experiment

O型圈中取样,在确定温度后,浸泡在选定的一种或几种介质中,一定时间后取称重,根据重量变化率、硬度变化率来推断材料的种类。 Samples can be taken from the purchased O-rings , immersed in the selected medium or media after determining the temperature, weighed after a certain period of time, and the type of material can be inferred based on the rate of change in weight and rate of change in hardness. For example, when immersed in 100 degree engine oil for 24 hours, the quality and hardness change rate of Ding Qing, fluorine rubber, neoprene is small, while natural rubber and ethylene propylene have more than doubled the weight and the hardness changes greatly, and the volume expansion is obvious.

 

介质浸泡副本.jpg

2.Combustion method

Take a sample and burn it in the air. Observe the phenomenon. Generally speaking, the fluorine rubber, natural rubber will extinguish after leaving the fire, even if the flame is burned, it is much smaller than EPDM. Of course, if you look closely, the burning state, color, and smell will also provide us with a lot of information. NBR/PVC并用胶,有火源时火劈啪的乱溅,似乎有水似的,离火自熄,烟浓且有酸味。 For example, NBR / PVC is used in combination with glue. When there is a fire source, the fire splashes and splatters. It seems to be water-like. It extinguishes itself from the fire, and the smoke is thick and acid. It should be noted that sometimes flame retardants but halogen-free glues will self-extinguish from the fire, which must be further inferred by other methods.

3. Hot air aging test

Take a sample and place it in an aging box for one day to observe the phenomenon after aging. In order to classify the aging, the temperature can be gradually increased. 150度下氯丁, 天然橡胶,SBR都会脆断,丁晴、三元乙丙还有弹性。 For example, at 150 degrees, neoprene, natural rubber, SBR will be brittle, Ding Qing, EPDM and elastic. When it rises to 180 degrees, ordinary Ding Qing will be brittle; while at 230 degrees, hydrogenated Ding Qing will also be brittle, and fluorine rubber and silicone still have good elasticity.

4.Low temperature method

或者设备 制造一个合适的低温环境。 Take a sample and make a suitable low temperature environment with dry ice and alcohol or equipment . 2-5分钟,在选定温度下感觉O型圈的软硬程度。 Soak the sample in a low-temperature environment for 2-5 minutes, and feel the softness and hardness of the O-ring at the selected temperature. For example, at -40 ° C, compared with silica gel and fluorine rubber, which have the same high temperature and oil resistance, silica gel will be softer.


5.Measure specific gravity

Use a precision electronic scale, plus a glass of water, a piece of hair is fine. 1.8以上,CR 、ECO的也多在1.3以上,比重明显偏大的可以考虑是这些胶。 Generally speaking, the proportion of fluorine rubber is the largest, more than 1.8, and CR and ECO are more than 1.3, and the proportion is obviously larger. These rubbers can be considered.



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