Material：borosilicate glass
·Outer diameter:50mm
·19/22 inner joint
Process characteristics
·Low expansion rate
·High strength and hardness
·High light transmittance and chemical stability
·High temperature resistance, 202° temperature change
·Internal grinding mouth design, manual grinding, good sealing
·Thickened bottle wall, evenly heated, strong and durable, no bubbles and no lines
·Bottle mouth is standard size of American standard, and it perfectly fits all interfaces