Products Precision Ball

GLASS BALLS


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 (DURAN-PYREX)


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 Â2O3 MgO
SODA-LIMA GLASS 67 16 7 5 3 2
BOROSILICATE GLASS (PYREX) 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 TEMPERATURE USE (MECHANICAL)      
NORMAL °C 110 230 110
EXTREME °C 460 490 380
RESISTANCE TO THERMAL STRESS 17 °C 53 °C 18 °C


MATERIAL DIAMETERS PRECISION GRADE
SODA-LIME GLASS mm 1 to mm 50 G100-200-500-1000
BOROSILICATE GLASS (PYREX) mm 1 to mm 50 G28-40-100
BLACK GLASS mm 1 to mm 50 G28-40-100

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