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The characteristics of the downward stratified filling mining method are: stratified mining from top to bottom and layer-by-layer cementing filling in the stage, generally adopting the approach type to carry out the mining operation under the protection of the upper layer artificial false roof. This filling mining method does not divide the mining room and the pillar, and the whole ore is recovered in one step.
What are the characteristics of the upward stratified filling mining and the downward stratified filling mining?
The characteristics of the upward stratified filling mining method are: dividing the ore into two steps of mining and mining, mining from the bottom to the top, and filling the goaf with fillings to support the goaf. Two gangs of surrounding rock and as a working platform for continued upward recovery. The filling method when returning to the mining room mainly includes hydraulic filling and cement filling.
Teflon Washer with the most uprising characteristics as below:
A.Resistant to many chemicals, includes ozone, chlorine, acetic acid, ammonia, sulfuric acid and hydrochloric acid.
B.Weather and UV resistance
C.Non Stick::Very few solid substances will permanently adhere to a Teflon coating. While tacky materials may show some adhesion, almost all substances release easily.
D. Outstanding performance at extreme temperatures to meet your special temperatures 'demands: it can temporarily withstand temperatures of 260C and cryogenic temperatures of -240C and still with the same chemical properties. Its initial melting point of 342C (+- 10C) & second melting pint at 327C (+- 10C).
E:The Teflon Washer Series Fittings with Class-A O-ring ,The FKM O-RING available for special required .