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  2. General Rules for the Interpretation of the Harmonized System

    en.wikipedia.org/wiki/General_Rules_for_the...

    GRI 4 prescribes how to classify products that cannot be classified according to GRI's 1, 2, and 3. GRI 5 prescribes how to classify packaging. GRI 6 prescribes how to classify products at the 6-digit subheading level, based on the wording of the subheadings and the relative HS Section and Chapter Notes.

  3. Spark testing - Wikipedia

    en.wikipedia.org/wiki/Spark_testing

    [2] 400-series stainless steel 400-series sparks are similar to 300-series sparks, but are slightly longer and have forks at the ends of the sparks. [2] Cast iron Cast iron has very short sparks that begin at the grinding wheel. [1] Nickel and cobalt high-temperature alloys These sparks are thin and very short, they are dark-red in color, and ...

  4. Metal stitching - Wikipedia

    en.wikipedia.org/wiki/Metal_stitching

    Metal stitching is an industrial technique for repairing cracked and broken cast iron, steel, bronze or aluminium structures and their components. The process is carried out cold, without welding . It allows the repair of cast iron and cast steel , often in-situ, without the distortion from welding , and can be used in other situations where ...

  5. Rockwell hardness test - Wikipedia

    en.wikipedia.org/wiki/Rockwell_hardness_test

    1 ⁄ 4 in (6.35 mm) ball: Bearing metals and other very soft or thin materials: 130: 500 R: HRR: 60: 12 in (12.70 mm) ball: Thermoplastics, bearing metals, and other very soft or thin materials: 130: 500 S: HRS: 100: 12 in (12.70 mm) ball: Bearing metals and other very soft or thin materials: 130: 500 V: HRV: 150: 12 in (12.70 ...

  6. Unified numbering system - Wikipedia

    en.wikipedia.org/wiki/Unified_numbering_system

    A UNS number only defines a specific chemical composition, it does not provided full material specification. Requirements such as material properties (yield strength, ultimate strength, hardness, etc.), heat treatment, form (rolled, cast, forged, flanges, tubes, bars, etc.), purpose (high temperature, boilers and pressure vessels, etc.) and testing methods are all specified in the material or ...

  7. Hemosiderosis - Wikipedia

    en.wikipedia.org/wiki/Hemosiderosis

    The aims of iron chelation therapy include (a) prevention therapy in order to minimize the risk of onset of iron-mediated complications, (b) rescue therapy for the removal of storage iron and (c) emergency therapy if heart failure develops or if there is a downward trend of left ventricular (LV) function that requires hospitalisation using ...

  8. Gas check - Wikipedia

    en.wikipedia.org/wiki/Gas_check

    Gas checks are most commonly found in the form of a thin cup or disc made of a ductile metal. Copper, zinc, aluminum, and alloys such as brass have been used. A bullet designed to accept a gas check has a rebated base shank which permits attachment of the check without altering the maximum diameter of the bullet.

  9. Perls Prussian blue - Wikipedia

    en.wikipedia.org/wiki/Perls_Prussian_blue

    Many methods of performing Perls Prussian blue stain for iron have been published, [2] Drury and Wallington (1980) give a protocol that uses a mixture of 1 part 2% hydrochloric acid and 1 part 2% potassium ferrocyanide that is applied to the section for 20–30 minutes followed by a rinse in distilled water and application of a counterstain ...

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