This Standard specifies the requirements, test methods, inspection rules, marks, package, transportation, storage, quality certificate and orders (or contracts) for the tungsten concentrate. This Standard applies to tungsten concentrate products selected in mine; it can be used for producing ammonium paratungstate, tungstic acid, ammonium metatungstate, tungsten oxide etc.

This Standard specifies the requirements, test methods, inspection rules, marking, package, transportation, storage, quality certificate, ordering list (or contract) contents of the high titanium slag. This Standard is applicable to the high titanium slag used by titanium tetrachloride, artificial rutile and titanium pigment with titanic iron ore as raw materials, and producing by electric furnace smelting.

This standard specifies the requirements, test methods, inspection rules and marking, packaging, transportation, storage, quality certificate and order form (or contract) content of O-Isopropyl-N-ethyl thionocarbamate. This standard applies to O-Isopropyl-N-ethyl thionocarbamate flotation reagents, which are synthesized from isopropyl xanthate, monochloroacetic acid, sodium carbonate, monoethylamine as raw materials.

This part of YS/T 1028 specifies the method for determining the carbon content in lithium iron phosphate. This part applies to the determination of carbon content in lithium iron phosphate. Measuring range: 0.5%~5.0%. 2 Method summary The sample and flux are put into a porcelain crucible and heated with a high-frequency induction furnace in the oxygen flow. The carbon is burned to generate carbon dioxide, which is carried by the oxygen to the infrared absorption cell. The change of carbon dioxide concentration on infrared absorption energy follows Beer's law. The analysis results of carbon content are directly displayed on the display as a percentage. 3 Reagents and materials 3.1 Oxygen: The purity is not less than 99.5%. 3.2 Desiccant: Anhydrous magnesium perchlorate with a particle size of 0.7 mm~1.2 mm. 3.3 Purifying agent: Soda asbestos with a particle size of 0.7 mm~1.2 mm. 3.4 Pure iron: The purity is greater than 99.8%, and the carbon content is less than 0.002%. 3.5 Tungsten particles: The carbon content is less than 0.002%. 3.6 Porcelain crucible: Before use, the porcelain crucible shall be placed in a muffle furnace and burned at 1200 ¡ãC for no less than 2 hours. After it is taken out and cooled slightly, it is stored in a desiccator. YS/T 1028.4-2015 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery Page 5 of 7 4 Instruments The operating parameters of the instruments shall meet the following requirements: -- High-frequency induction furnace: It shall meet the requirements of the sample melting temperature. -- Electronic balance: The sensitivity shall be 0.1 mg. 5 Samples 5.1 Before use, the sample shall be dried in an oven at 110 ¡ãC¡À5 ¡ãC for 1 hour, then taken out and stored in a desiccator. 5.2 The particle size of the sample shall not be larger than 0.10 mm. 6 Analysis steps WARNING -- The hazards associated with combustion analysis are primarily pre-fired porcelain crucibles and combustion during the melting process. Always use crucible tong...

This Standard applies to the determination of the welding strength of plastic welded to plastic or other base materials (such as aluminium foils) and the welding strength of plastic compound bags.

This Standard specifies the terms and definitions, classification and designation, general requirements, materials, performances, fabrication and assembling requirements, test methods, inspection rules and marking, packaging, transportation and storage of the building glass the skylight system.

This Standard applies to the test for the stress of medicinal glass containers. Usually, glass is an isotropic homogeneous material. When there is stress, it will show anisotropy and produce light birefringence. This Standard specifies the test of using a polarized light stress meter to measure the optical path difference of birefringence, and using the numerical value of the optical path difference of unit thickness to express the magnitude of stress of product.