Home > Products > Chemicals > Chemical Lab Supplies

polishing circle clear Borosilicate glass discs/borosilicate glass/circle borosilicate glass:

Borosilicate glass 3.3 is one of transparent colorless glass, through wavelength is between 300 nm to 2500 nm, transmissivity is more than 90%. Coefficient of thermal expansion is 3.3. It can acid proof and alkali , the high temperature resistant is about 450°C. If course handling , the high temperature resistant can reach 550°C or so. Apply to lighting fixture , chemical industry , electron, high temperature equipment and so on.

Borosilicate glass 3.3 has excellent transmission over the visible and NIR wavelengths working from 310nm to 2700nm. The surface quality is not as high as the BK7 versions.

Borosilicate glass 3.3 has excellent chemical and thermal-shock resistance and has a maximum working temperature of 500°C so are excellent for use in high powered light source applications or an excellent choice for cold and hot mirror substrates.

BOROSILICATE GLASS 3.3

Densityρ:
2.23± 0.02g/cm3
Hardness:
>7
Tensile strength:
4.8×107Pa(N/M2)
Bulk modulus:
93×103 M pa
Modulus of rigidity:
3.1×1010Pa
Young's modulus:
63KN/mm3
Compressive strength:
1200kg/ cm2
Poisson's ratio:
0.18
Thermal expansion coefficient:
(0-300℃) (3.3±0.1)x10-6K-1
Coefficient of thermal conductivity:
1.2W×(m×k) -1
Specific heat capacity:
(20-100℃) 00.82kJx(kgxk)
Optical performance:

1. Light transmittance:
92%
2. The refractive index:
Nd: 1.47384
3. The wavelength:
435.8nm=1.481, 479.9nm=1.4772 , 546.1nm=1.4732
Softening point:
810±10 ℃
The resistivity1gρ
250℃ 8.0Ω×cm
Dielectric coefficientε
4.7
Dielectric strength
5 ×107V/M
Dielectric loss factor
tanσ(MC20℃)≤38 ×10-4
Resistance to cold and hot shock
280℃
Continuous working temperature
≤550℃
Water resistance:
ISO719 HGB Level 1
Acid resistance
ISO195 HGB Level 1
Alkali resistance
ISO695 HGB Level 2