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GB/T 903-2019 English PDF (GBT903-2019)
GB/T 903-2019 English PDF (GBT903-2019)
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GB/T 903-2019: Colourless optical glass
GB/T 903-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 81.040.30
N 05
Replacing GB/T 903-1987
Colorless optical glass
无色光学玻璃
ISSUED ON: MAY 10, 2019
IMPLEMENTED ON: DECEMBER 01, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions... 6
4 Series, types, naming, marking ... 7
5 Requirements ... 8
6 Test methods ... 14
7 Inspection rules ... 16
8 Signs and labels ... 17
9 Packaging, transportation, storage ... 18
Appendix A (Informative) Colorless optical glass's nd-υd field diagram ... 19
Appendix B (Informative) Some physical-chemical performance parameters of
colorless optical glass ... 20
Colorless optical glass
1 Scope
This standard specifies the terms and definitions, series, types, naming and marking,
requirements, test methods, inspection rules, signs and labels, packaging, transportation,
storage of colorless optical glass (hereinafter referred to as optical glass).
This standard is applicable to the colorless optical glass blanks, which have 8 mm ≤
minimum side length ≤ 150 mm AND in the form of strips (bars) and blocks
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 2829 Sampling procedures and tables for periodic inspection by attributes
(Apply to inspection of process stability)
GB/T 7962.1-2010 Test methods of colorless optical glass - Part 1: Refractive index
and coefficient of dispersion
GB/T 7962.2-2010 Test methods of colorless optical glass - Part 2: Optical
homogeneity - Fizeau plano-interferometry
GB/T 7962.5-2010 Test methods of colorless optical glass - Part 5: Stress
birefringence
GB/T 7962.8-2010 Test methods of colorless optical glass - Part 8: Bubble
GB/T 7962.9-2010 Test methods of colorless optical glass - Part 9: Coefficient of
optical absorption
GB/T 7962.10-2010 Test methods of colorless optical glass - Part 10: X-rays
stability
GB/T 7962.12-2010 Test methods of colorless optical glass - Part 12: Spectral
internal transmittance
GB/T 7962.14-2010 Test methods of colorless optical glass - Part 14: Resistance to
acid
GB/T 7962.15-2010 Test methods of colorless optical glass - Part 15: Resistance to
humidity
GB/T 7962.16-2010 Test methods of colorless optical glass - Part 16: Linear thermal
expansion coefficient transformation temperature and yield point temperature
GB/T 7962.18-2010 Test methods of colorless optical glass - Part 18: Knoop
hardness
GB/T 7962.20-2010 Test methods of colorless optical glass - Part 20: Density
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Environment friendly colorless optical glass
The optical glass, which has a total amount of environmentally hazardous impurities
caused by impurities in chemical raw materials or furnace materials and processes
as follows: lead (Pb) ≤ 100 mg/kg, arsenic (As) ≤ 100 mg/kg, cadmium (Cd) ≤ 5
mg/kg, mercury (Hg) ≤ 100 mg/kg, hexavalent chromium (Cr6+) ≤ 100 mg/kg.
3.2
Color cord
λ80/λ5
The ratio -- of the wavelength λ80 corresponding to the spectral transmittance of 80%
of optical glass (thickness of 10 mm ± 0.1 mm) TO the wavelength λ5 corresponding
to the spectral transmittance of 5%. When ne ≥ 1.85, the wavelength λ70
corresponding to the spectral transmittance of 70% is used, instead of λ80.
Example: When the spectral transmittance is 80%, the corresponding wavelength is 367
nm; when the spectral transmittance is 5%, the corresponding wavelength is 323 nm; THEN,
λ80/λ5 is 37/32.
3.3
Inclusions
Foreign impurities or foreign matter, which is present in optical glass.
Note: For example, bubbles, grains, nodules, stones, platinum particles.
Chinese Pinyin alphabet of the word "Huan" plus "-" as a prefix. Environmentally
friendly optical glass, which has low softening point properties is represented by the
initial "D" of the Chinese Pinyin alphabet of the word "Di" plus "-" as a prefix. Each
optical glass designation is represented by its type code plus serial number.
4.4 Marking
4.4.1 Marking method
It consists of three parts: Optical glass grade, smelting batch number, standard number.
4.4.2 Marking example
The optical glass, which is designated H-K9 AND has the melting batch number
G0220091105, is marked as follows:
Colorless optical glass GB/T 903-2019-G0220091105 H-K9
5 Requirements
5.1 Specifications, dimensions, surface quality
5.1.1 Strip (bar) material's specification tolerance
Length tolerance: It shall be less than or equal to 20 mm.
Width tolerance: It shall be less than or equal to 2 mm.
Center thickness tolerance: It shall be less than or equal to 3 mm.
5.1.2 Tolerance of round (bar) material
Round bar length tolerance: It shall be less than or equal to 20 mm.
5.1.3 Surface quality of strip (bar) material
The surface of the strip (bar) material is naturally smooth; OR after grinding, the depth
of surface defects (including bumps, burst points, ripples, cracks, inclusions, etc.) shall
be less than or equal to 0.5 mm.
5.1.4 Blocks
5.1.4.1 Single block supply: If the side length is less than 100 mm, the tolerance range
of each side shall be not more than 3 mm; if the side length is not less than 100 mm, the
tolerance range of each side shall be not more than 5 mm.
5.1.4.2 Multiple block supply: According to the multiple side length, the tolerance
provisions of 5.1.4.1 shall be implemented. Reserve the kerf, which needs to be cut,
resistance to moisture RC, transition temperature Tg, relaxation temperature Ts, linear
expansion coefficient α, Knoop hardness HK, density ρ, etc., as shown in Appendix B.
6 Test methods
6.1 Specifications, dimensions, surface quality
The specification tolerance of optical glass is measured with a steel ruler, which has a
division value of 1 mm. Visually check the surface defects.
6.2 Environmentally hazardous substances
For the indicators of environmentally hazardous substances in environmentally friendly
colorless optical glass, the acid dissolution method can be used to treat the sample; use
the inductively coupled plasma emission spectroscopy (ICP-AES) or atomic absorption
spectroscopy (AAS) or atomic fluorescence spectroscopy (AFS), to carry out analysis.
It may also directly grind the environmentally friendly glass into a flat plate; use X-ray
fluorescence spectroscopy for analysis.
6.3 Refractive index, dispersion coefficient, batch deviation
The refractive index, dispersion coefficient, batch deviation of optical glass are tested
according to the method of GB/T 7962.1-2010. The measurement uncertainty of
refractive index is ±5×10-5.
6.4 Optical uniformity
The optical uniformity of optical glass is tested, according to the method of GB/T
7962.2-2010.
6.5 Stress birefringence
The stress birefringence of optical glass is tested, according to the method of GB/T
7962.5-2010.
6.6 Streak degree (projection method)
There are two types of streak detection methods:
a) Streak degree detection method 1: The princip...
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Historical versions: GB/T 903-2019
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GB/T 903-2019: Colourless optical glass
GB/T 903-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 81.040.30
N 05
Replacing GB/T 903-1987
Colorless optical glass
无色光学玻璃
ISSUED ON: MAY 10, 2019
IMPLEMENTED ON: DECEMBER 01, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions... 6
4 Series, types, naming, marking ... 7
5 Requirements ... 8
6 Test methods ... 14
7 Inspection rules ... 16
8 Signs and labels ... 17
9 Packaging, transportation, storage ... 18
Appendix A (Informative) Colorless optical glass's nd-υd field diagram ... 19
Appendix B (Informative) Some physical-chemical performance parameters of
colorless optical glass ... 20
Colorless optical glass
1 Scope
This standard specifies the terms and definitions, series, types, naming and marking,
requirements, test methods, inspection rules, signs and labels, packaging, transportation,
storage of colorless optical glass (hereinafter referred to as optical glass).
This standard is applicable to the colorless optical glass blanks, which have 8 mm ≤
minimum side length ≤ 150 mm AND in the form of strips (bars) and blocks
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 2829 Sampling procedures and tables for periodic inspection by attributes
(Apply to inspection of process stability)
GB/T 7962.1-2010 Test methods of colorless optical glass - Part 1: Refractive index
and coefficient of dispersion
GB/T 7962.2-2010 Test methods of colorless optical glass - Part 2: Optical
homogeneity - Fizeau plano-interferometry
GB/T 7962.5-2010 Test methods of colorless optical glass - Part 5: Stress
birefringence
GB/T 7962.8-2010 Test methods of colorless optical glass - Part 8: Bubble
GB/T 7962.9-2010 Test methods of colorless optical glass - Part 9: Coefficient of
optical absorption
GB/T 7962.10-2010 Test methods of colorless optical glass - Part 10: X-rays
stability
GB/T 7962.12-2010 Test methods of colorless optical glass - Part 12: Spectral
internal transmittance
GB/T 7962.14-2010 Test methods of colorless optical glass - Part 14: Resistance to
acid
GB/T 7962.15-2010 Test methods of colorless optical glass - Part 15: Resistance to
humidity
GB/T 7962.16-2010 Test methods of colorless optical glass - Part 16: Linear thermal
expansion coefficient transformation temperature and yield point temperature
GB/T 7962.18-2010 Test methods of colorless optical glass - Part 18: Knoop
hardness
GB/T 7962.20-2010 Test methods of colorless optical glass - Part 20: Density
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Environment friendly colorless optical glass
The optical glass, which has a total amount of environmentally hazardous impurities
caused by impurities in chemical raw materials or furnace materials and processes
as follows: lead (Pb) ≤ 100 mg/kg, arsenic (As) ≤ 100 mg/kg, cadmium (Cd) ≤ 5
mg/kg, mercury (Hg) ≤ 100 mg/kg, hexavalent chromium (Cr6+) ≤ 100 mg/kg.
3.2
Color cord
λ80/λ5
The ratio -- of the wavelength λ80 corresponding to the spectral transmittance of 80%
of optical glass (thickness of 10 mm ± 0.1 mm) TO the wavelength λ5 corresponding
to the spectral transmittance of 5%. When ne ≥ 1.85, the wavelength λ70
corresponding to the spectral transmittance of 70% is used, instead of λ80.
Example: When the spectral transmittance is 80%, the corresponding wavelength is 367
nm; when the spectral transmittance is 5%, the corresponding wavelength is 323 nm; THEN,
λ80/λ5 is 37/32.
3.3
Inclusions
Foreign impurities or foreign matter, which is present in optical glass.
Note: For example, bubbles, grains, nodules, stones, platinum particles.
Chinese Pinyin alphabet of the word "Huan" plus "-" as a prefix. Environmentally
friendly optical glass, which has low softening point properties is represented by the
initial "D" of the Chinese Pinyin alphabet of the word "Di" plus "-" as a prefix. Each
optical glass designation is represented by its type code plus serial number.
4.4 Marking
4.4.1 Marking method
It consists of three parts: Optical glass grade, smelting batch number, standard number.
4.4.2 Marking example
The optical glass, which is designated H-K9 AND has the melting batch number
G0220091105, is marked as follows:
Colorless optical glass GB/T 903-2019-G0220091105 H-K9
5 Requirements
5.1 Specifications, dimensions, surface quality
5.1.1 Strip (bar) material's specification tolerance
Length tolerance: It shall be less than or equal to 20 mm.
Width tolerance: It shall be less than or equal to 2 mm.
Center thickness tolerance: It shall be less than or equal to 3 mm.
5.1.2 Tolerance of round (bar) material
Round bar length tolerance: It shall be less than or equal to 20 mm.
5.1.3 Surface quality of strip (bar) material
The surface of the strip (bar) material is naturally smooth; OR after grinding, the depth
of surface defects (including bumps, burst points, ripples, cracks, inclusions, etc.) shall
be less than or equal to 0.5 mm.
5.1.4 Blocks
5.1.4.1 Single block supply: If the side length is less than 100 mm, the tolerance range
of each side shall be not more than 3 mm; if the side length is not less than 100 mm, the
tolerance range of each side shall be not more than 5 mm.
5.1.4.2 Multiple block supply: According to the multiple side length, the tolerance
provisions of 5.1.4.1 shall be implemented. Reserve the kerf, which needs to be cut,
resistance to moisture RC, transition temperature Tg, relaxation temperature Ts, linear
expansion coefficient α, Knoop hardness HK, density ρ, etc., as shown in Appendix B.
6 Test methods
6.1 Specifications, dimensions, surface quality
The specification tolerance of optical glass is measured with a steel ruler, which has a
division value of 1 mm. Visually check the surface defects.
6.2 Environmentally hazardous substances
For the indicators of environmentally hazardous substances in environmentally friendly
colorless optical glass, the acid dissolution method can be used to treat the sample; use
the inductively coupled plasma emission spectroscopy (ICP-AES) or atomic absorption
spectroscopy (AAS) or atomic fluorescence spectroscopy (AFS), to carry out analysis.
It may also directly grind the environmentally friendly glass into a flat plate; use X-ray
fluorescence spectroscopy for analysis.
6.3 Refractive index, dispersion coefficient, batch deviation
The refractive index, dispersion coefficient, batch deviation of optical glass are tested
according to the method of GB/T 7962.1-2010. The measurement uncertainty of
refractive index is ±5×10-5.
6.4 Optical uniformity
The optical uniformity of optical glass is tested, according to the method of GB/T
7962.2-2010.
6.5 Stress birefringence
The stress birefringence of optical glass is tested, according to the method of GB/T
7962.5-2010.
6.6 Streak degree (projection method)
There are two types of streak detection methods:
a) Streak degree detection method 1: The princip...
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