GB/T 903-2019 PDF English
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Colourless optical glass
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GB/T 903-2019: Colourless optical glass---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT903-2019
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 principle is as shown in Figure 1. S is the
monochromatic light source; D is the fine frosted glass immersion screen; A is
the pinhole aperture, which is located at the back focal point of the collimating
achromatic lens L1; B is the movable cross slit, which is located on the back focal
plane of the objective lens L2. The sample to be tested is placed at point P, so that
its polished surface is perpendicular to the line of sight. The light deflection and
drift, which is caused by the slight non-parallelism of the polished surface, are
compensated by a movable cross slit. The cross slit shall be adjusted, so that the
6.7 Inclusions
The inclusions of optical glass are tested, according to the method of GB/T 7962.8-
2010.
6.8 Color cord, light absorption coefficient
The optical absorption coefficient of optical glass is tested, according to the method
specified in GB/T 7962.9-2010. Color cord test of optical glass: use the samples which
have a thickness of 10 mm ± 0.1 mm; grind the two opposite surfaces to be parallel; use
a spectrophotometer to test the transmittance (including surface reflection loss),
according to the method of GB/T 7962.12-2010. Respectively use λ80(70) and λ5, to
represent wavelengths at a transmittance of 80% (70%) and 5%.
6.9 X-ray resistance
The X-ray resistance of X-ray-resistant optical glass is tested, according to the method
of GB/T 7962.10-2010.
6.10 Physical-chemical properties
The acid resistance of optical glass is tested, according to the method of GB/T 7962.14-
2010; the moisture resistance is tested, according to the method of GB/T 7962.15-2010;
the linear expansion coefficient, transition temperature, relaxation temperature are
tested, according to the method of GB/T 7962.16-2010; Knoop hardness is tested,
according to the method of GB/T 7962.18-2010; density is tested, according to the
method of GB/T 7962.20-2010.
7 Inspection rules
7.1 General
Inspection is divided into exit-factory inspection and type inspection.
7.2 Exit-factory inspection
Optical glass is supplied in batches. A batch of optical glass blanks shall consist of the
same designation, smelting batch number, annealing number.
7.3 Type inspection
Type inspection shall be carried out, in one of the following situations:
a) When the product is subject to type finalization OR trans-plant production;
b) After formal production, where there are major changes in raw materials, formulas
and processes, which may affect product performance;
8.2.1 Labels for packing box
The labels for packing box shall have the following markings:
a) Optical glass's designation, melting number;
b) Specification and mass (kg).
8.2.2 Product certificate
The product certificate shall have the following marks:
a) Qualification seal;
b) Optical glass's designation, melting number;
c) Contract number;
d) Some properties and some technical indicators, such as: refractive index nd,
dispersion coefficient υd, density ρ, bubble degree, streak degree, stress
birefringence, color cord, etc.;
e) Optical density increment of X-ray resistant glass.
9 Packaging, transportation, storage
9.1 Packaging
It is packed in qualified carton or wooden box; each piece of glass shall be separated
by cardboard to avoid collision; there shall be no looseness in the box. The packaging
shall be intact, the box surface is clean, the handwriting is clear, the text is consistent
with the content. Each batch of glass shall be accompanied by a product certificate.
9.2 Transportation and storage
9.2.1 When the glass is stacked, the upper and lower glasses shall be separated by a
cardboard.
9.2.2 When transporting or storing, it shall be rain-proof and moisture-proof; handle
with care; do not collide.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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