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BOROSILICATE GLASS BALLS
Glass balls with high chemical and thermal stability. They are electric insulators and they are resisting even at strong external strengths and pressure variations.
Applications
Special valves, safety valves, metering pumps. They are used in the pharmaceutical field and photographic devices.
Chemical Composition（%）
SiO2 | Na2O | CaO | Al2O3 | B2O3 | K2O | BaO |
65.00-85.00 | 3.00-9.00 | 2.50 max | 1.00-5.00 | 8.00-15.00 | 2.00 max | 1.00 max |
Physical / Mechanical / Thermal / Electric / Magnetic Properties
Property | Symbol | U.o.M. | Type | Notes | Values |
Density | δ | g/cm3 | Physical | Room temp. | 2.23 |
Young's modulus | E | GPa | Mechanical | - | 64 |
Refractive index | n | - | Optic | - | 1.471 |
Softening temperature | - | ºC/ºF | Thermal | Room temp./P.atm. | 821/1510 |
Coefficient of linear thermal expansion | α | 10-6/ºC | Thermal | (ΔT=0-100°C) | 3.30 |
Thermal conductivity | λ | W/(m·K) | Thermal | Room temp. | 1.15 |
Volume resistivity | ρ | Ω*m | Electric | - | > 1015 |
Relative magnetic permeability | µ | - | Magnetic | Diamagnetic | <1 |
Technical Data
Property | Type | U.o.M. | Values | U.o.M. | Values |
Hardness | Mechanical | Knoop | 420-520 | - | - |
Ultimate compressive strength | Mechanical | MPa | 1900-2100 | psi*103 | 275-305 |
Service temperature | Thermal | ºC | 0/200 | ºF | 32/392 |
Range
Diameters | U.o.M. | Diameters | U.o.M. | Precision Grade (ISO 3290) |
1.000 - 100.000 | mm | 3/64 - 4 | inch | G100 -......- G2000 |
Corrosion Resistance
Borosilicate balls have excellent corrosion resistance into water, most acid compounds, salt solutions, organic solvents and halogens. They are useful to resist in strong oxidizing environments. Fairish resistance to alkaline solutions, tehy do not resist to strong alkaline solutions, hydrofluoric acid and hot concentrated phosphoric acid.