Quartz glass contains nickel sulfide particles, in the steel cooling when the nickel sulfide particles become smaller, but its particles will be slow down after the growth, resulting in the concentration of glass caused by water from the waterfall.

Hot dip is the glass heated to 280 a 300 ℃, so that the rapid growth of nickel sulfide particles, which may occur blew the tempered glass in advance detonated. After heating, insulation and cooling process, so that the smaller diameter of the glass within the nickel sulfide particles to a stable state, so that the internal stress of the glass tends to balance, in order to achieve the purpose of reducing the glass blew rate.

For the existence of stones inside, bubbles of glass, in the hot-dip treatment furnace can be tempted to burst.

Equipment for hot-dip treatment of tempered glass. Called a hot-dip furnace or homogenized furnace.