GB/T 903-2019 Colourless optical glass English
1 Scope
This standard specifies the terms and definitions, series, types, nomenclature and mark, requirements, test methods, inspection rules, marking and labeling, packaging, transportation and storage of colorless optical glass (hereinafter referred to as optical glass).
This standard is applicable to optical glass blanks in the form of strips (bars), blocks and other forms with minimum side length ranging from 8 mm to 150 mm.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
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 colourless optical glass - Part 1: Refractive index and coefficient of dispersion
GB/T 7962.2-2010 Test methods of colourless optical glass - Part 2: Optical homogeneity - Fizeau piano-interferometry
GB/T 7962.5-2010 Test methods of colourless optical glass - Part 5: Stress birefringence
GB/T 7962.8-2010 Test methods of colourless optical glass - Part 8: Bubble
GB/T 7962.9-2010 Test methods of colourless optical glass - Part 9: Coefficient of optical absorption
GB/T 7962.10-2010 Test methods of colourless optical glass - Part 10: X-rays stability
GB/T 7962.12-2010 Test methods of colourless optical glass - Part 12: Spectral internal transmittance
GB/T 7962.14-2010 Test methods of colourless optical glass - Part 14: Resistance to acid
GB/T 7962.15-2010 Test methods of colourless optical glass - Part 15: Resistance to humidity
GB/T 7962.16-2010 Test methods of colourless optical glass - Part 16: Linear thermal expansion coefficient, transformation temperature and yield point temperature
GB/T 7962.18-2010 Test methods of colourless optical glass - Part 18: Knoop hardness
GB/T 7962.20-2010 Test methods of colourless optical glass - Part 20: Density
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
environment friendly colourless optical glass
colourless optical glass in which the total content of environmentally hazardous impurities originating from chemical raw material impurities, melting furnace materials, manufacturing processes or other sources is limited to: lead (Pb) ≤ 100 mg/kg, arsenic (As) ≤ 100 mg/kg, cadmium (Cd) ≤ 5 mg/kg, mercury (Hg) ≤ 100 mg/kg, and hexavalent chromium (Cr⁶⁺) ≤ 100 mg/kg
3.2
colour cord
λ80/λ5
ratio of the wavelength λ80 corresponding to a spectral transmittance of 80% to the wavelength λ5 corresponding to a spectral transmittance of 5%, measured on an optical glass with a thickness of 10 mm ± 0.1 mm. When ne≥1.85, λ80 is replaced by the wavelength λ70 corresponding to a spectral transmittance of 70%.
Example: If the wavelength corresponding to 80% spectral transmittance is 367 nm and the wavelength corresponding to 5% spectral transmittance is 323 nm, the value of λ80/λ5 is 367/323.
3.3
inclusions
foreign impurities or foreign matters existing in optical glass.
Note: Examples include bubbles, crystallites, knots, stones and platinum particles.
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Series, types, nomenclature and mark
5 Requirements
6 Test methods
7 Inspection rules
8 Marking and label
9 Packaging, transportation and storage
Annex A (Informative) nd−υd Abbe diagram of colourless optical glass
Annex B (Informative) Partial physical and chemical performance parameters of colourless optical glass
GB/T 903-2019 Colourless optical glass English
1 Scope
This standard specifies the terms and definitions, series, types, nomenclature and mark, requirements, test methods, inspection rules, marking and labeling, packaging, transportation and storage of colorless optical glass (hereinafter referred to as optical glass).
This standard is applicable to optical glass blanks in the form of strips (bars), blocks and other forms with minimum side length ranging from 8 mm to 150 mm.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
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 colourless optical glass - Part 1: Refractive index and coefficient of dispersion
GB/T 7962.2-2010 Test methods of colourless optical glass - Part 2: Optical homogeneity - Fizeau piano-interferometry
GB/T 7962.5-2010 Test methods of colourless optical glass - Part 5: Stress birefringence
GB/T 7962.8-2010 Test methods of colourless optical glass - Part 8: Bubble
GB/T 7962.9-2010 Test methods of colourless optical glass - Part 9: Coefficient of optical absorption
GB/T 7962.10-2010 Test methods of colourless optical glass - Part 10: X-rays stability
GB/T 7962.12-2010 Test methods of colourless optical glass - Part 12: Spectral internal transmittance
GB/T 7962.14-2010 Test methods of colourless optical glass - Part 14: Resistance to acid
GB/T 7962.15-2010 Test methods of colourless optical glass - Part 15: Resistance to humidity
GB/T 7962.16-2010 Test methods of colourless optical glass - Part 16: Linear thermal expansion coefficient, transformation temperature and yield point temperature
GB/T 7962.18-2010 Test methods of colourless optical glass - Part 18: Knoop hardness
GB/T 7962.20-2010 Test methods of colourless optical glass - Part 20: Density
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
environment friendly colourless optical glass
colourless optical glass in which the total content of environmentally hazardous impurities originating from chemical raw material impurities, melting furnace materials, manufacturing processes or other sources is limited to: lead (Pb) ≤ 100 mg/kg, arsenic (As) ≤ 100 mg/kg, cadmium (Cd) ≤ 5 mg/kg, mercury (Hg) ≤ 100 mg/kg, and hexavalent chromium (Cr⁶⁺) ≤ 100 mg/kg
3.2
colour cord
λ80/λ5
ratio of the wavelength λ80 corresponding to a spectral transmittance of 80% to the wavelength λ5 corresponding to a spectral transmittance of 5%, measured on an optical glass with a thickness of 10 mm ± 0.1 mm. When ne≥1.85, λ80 is replaced by the wavelength λ70 corresponding to a spectral transmittance of 70%.
Example: If the wavelength corresponding to 80% spectral transmittance is 367 nm and the wavelength corresponding to 5% spectral transmittance is 323 nm, the value of λ80/λ5 is 367/323.
3.3
inclusions
foreign impurities or foreign matters existing in optical glass.
Note: Examples include bubbles, crystallites, knots, stones and platinum particles.
Contents of GB/T 903-2019
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Series, types, nomenclature and mark
5 Requirements
6 Test methods
7 Inspection rules
8 Marking and label
9 Packaging, transportation and storage
Annex A (Informative) nd−υd Abbe diagram of colourless optical glass
Annex B (Informative) Partial physical and chemical performance parameters of colourless optical glass
