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Borosilicate Glass Balls
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Borosilicate Glass Balls

BOROSILICATE GLASS BALLSGlass balls with high chemical and thermal stability. They are electric insulators and they are resis

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.