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GB/T 903-2019: Colourless optical glass Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 903: Historical versions
Similar standardsGB/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/GBT903-2019NATIONAL 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 ContentsForeword ... 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 glass1 ScopeThis 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 blocks2 Normative referencesThe 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: Density3 Terms and definitionsThe 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-K95 Requirements5.1 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 methods6.1 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 rules7.1 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, storage9.1 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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