Glass Balls are dimensionally stable, resist corrosion and chemical absorption and can withstand high temperatures (up to 600O F .) Density varies depending on the type of glass used to manufacture the ball. We provide high precision balls from the following types of glass:

SODA-LIME GLASS - (CRYSTAL GLASS):
Material resistant to high alkaline solutions. Soda-lime glass balls are mainly used for applications not subjected to strong mechanical or thermal shocks, such as plastic bearings, flow meters, measurement and control equipment, instruments and ink cartridges.

BOROSILICATE GLASS
Due to its excellent chemical inertia to most acids, this kind of glass is particularly suitable for metering pumps and valves against strong oxidising concentrations.

BLACK GLASS
A kind of glass often used for medical and chemical flow meters and for general measurement and control instruments.

CHEMICAL COMPOSITION %
MATERIAL	SiO2	NA2O	CaO	AI2O3	A2O3	MgO
Soda-Lime Glass	67	16	7	5	3	2
Borosilicate Glass	81	4	-	2	13	-
Black Glass	69.7	15.2	3,4	-	1,3	-

PROPERTIES	SODA-LIME GLASS	BOROSILICATE GLASS	BLACK GLASS
Specific Weight	2,50	2,23	2,55
Hardness (KNOOP-KHN)	465	418	405
Melting Point °C	695	820	650
MAX TEMPARATURE USE (mechanical)
Normal °C	110	230	110
Extreme °C	460	490	380
Resistance to Thermal Stress	17° C	53° C	18° C