... additives, the mixture of concrete, all kinds of acids.Technical experiment*Drop experiment: environmental temperature at -18, height of fall: 1.2m ... , no breakage and no leakage.*Gas-tight experiment: 20Kpam air pressure for 20 minutes, no breakage and ... no leakage.*Hydraulic experiment: 100Kpa water pressure for 10minutes, no breakage and no leakage ...