T/JSAS 043-2023 Active

Scope: This document specifies the requirements for tea crystal products, product grading, inspection methods, inspection rules, and packaging and transportation requirements. This document applies to the production of natural tea crystals. It applies to monochrome natural tea crystals. It does not apply to special encapsulated natural tea crystals or anomalous natural tea crystal grading. Main technical content: Tea crystals typically contain gaseous, liquid, and solid inclusions. These inclusions, which come in a variety of colors and shapes, are a special type of crystal collection. 4. Physical and chemical properties of raw materials: The physical and chemical properties of raw materials shall meet the requirements of Table 1. Table 1: Physical and chemical properties of raw materials Item Indicator Luster Glass luster Cleavage Density 2.66 (+0.03, -0.02) g/cm3 Optical characteristics Anisotropic, uniaxial, positive birefringence, may exhibit "bull's eye" interference patterns Weak polychromism, varying by color Refractive index 1.544–1.553 Birefringence 0.009 Fluorescence observation Long-wave: none; short-wave: none UV-visible spectrum No characteristic Enlarged inspection Color bands, liquid and gas-liquid two-phase inclusions, gas-liquid-solid three-phase inclusions, needle-shaped rutile, tourmaline, and other inclusions Mineral inclusions Silica content (%): ≥99.99 Aluminum content (mg/kg): ≤15.0 Total impurity content (mg/kg): ≤20.0 Note: Density, silica content, aluminum content, and total impurity content apply to the crystal main body. 5. Product requirements 5.1 Eyewear 5.1.1 The crystal color should be uniform and have the best transparency. 5.1.2 Tea crystal eyewear comes in square, round, oval, Ray-Ban style, butterfly, and other shapes. 5.1.3 The thickness of tea crystal eyewear lenses is typically in the range of 2.5mm–3.5mm. It can also be customized according to customer require