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  2. Hollow structural section - Wikipedia

    en.wikipedia.org/wiki/Hollow_structural_section

    During the manufacturing process the mother tube goes through a series of shaping stands which form the round HSS (mother tube) into the final square or rectangular shape. Most American manufacturers adhere to the ASTM A500 or newly adopted ASTM A1085 standards, while Canadian manufacturers follow both ASTM A500 and CSA G40.21.

  3. ASTM A500 - Wikipedia

    en.wikipedia.org/wiki/ASTM_A500

    ASTM A500 is a standard specification published by the ASTM for cold-formed welded and seamless carbon steel structural tubing in round, square, and rectangular shapes. It is commonly specified in the US for hollow structural sections, but the more stringent CSA G40.21 is preferred in Canada.

  4. Rio Tinto Aluminium - Wikipedia

    en.wikipedia.org/wiki/Rio_Tinto_Aluminium

    Rio Tinto Aluminium (previously known as Comalco) is now known as Rio Tinto Alcan after Rio's takeover of Alcan.It was the world's eighth largest aluminium company. It mines and manufactures bauxite, alumina and primary aluminium.

  5. Printed circuit board - Wikipedia

    en.wikipedia.org/wiki/Printed_circuit_board

    Copper thickness of PCBs can be specified directly or as the weight of copper per area (in ounce per square foot) which is easier to measure. One ounce per square foot is 1.344 mils or 34 micrometers thickness. Heavy copper is a layer exceeding three ounces of copper per ft 2, or approximately 0.0042 inches (4.2 mils, 105 μm) thick. Heavy ...

  6. Steamship - Wikipedia

    en.wikipedia.org/wiki/Steamship

    An effective stern tube and associated bearings were required. The stern tube contains the propeller shaft where it passes through the hull structure. It should provide an unrestricted delivery of power by the propeller shaft. The combination of hull and stern tube must avoid any flexing that will bend the shaft or cause uneven wear.

  7. Kevlar - Wikipedia

    en.wikipedia.org/wiki/Kevlar

    If successful, the new fabric will generate about 80 milliwatts per square meter. [46] A retractable roof of over 60,000 sq ft (5,600 m 2) of Kevlar was a key part of the design of the Olympic Stadium, Montreal for the 1976 Summer Olympics. It was spectacularly unsuccessful, as it was completed 10 years late and replaced just 10 years later in ...