Why would the nickel sulfide tempered sight glass explode?
In the process of making sight glass, some special impurities, called nickel sulfide, are sometimes retained in the interior of the sight glass. The reason is that it is special because it does not heat and shrink like the ordinary matter, on the contrary, it will heat the cold expansion.
The toughened sight glass is made by sight glass after quenching of high temperature processing, in this process, the first volume of nickel sulfide is reduced after heating, cooling expansion, the sight glass internal stress greatly, which makes the toughened sight glass appear explosive phenomenon.
This is usually made of toughened sight glass in shortly after the explosion, but in individual cases, when the nickel sulfide is located in the middle of toughened sight glass, the longest delay will explode, can be delayed until a few years later.
NiS sight glass is impurity in nickel sulfide, it cannot be completely removed from the sight glass, the total amount of NiS in the sight glass, the impurities to nature is similar with water belongs to the cold expansion and thermal shrinkage, tempered sight glass tempered in the process he will shrink, the cooling process will become larger (with displacement), but because the cooling time is very short, not enough to let it restore the normal size, so after the cooling process will continue to change, this change may cause the tempered sight glass explode, the tempered sight glass is inevitable.

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tempered sight glass

sight glass	tempered sight glass	Clear Tempered Glass Lens	Tempered Boiler Sight Glass	tempered glass disc
sight glass	tempered sight glass	Clear Tempered Glass Lens	Tempered Boiler Sight Glass	tempered glass disc
sight glass	tempered sight glass	Clear Tempered Glass Lens	Tempered Boiler Sight Glass	tempered glass disc