AS 3668:2019 pdf free.Flexible itermediate bulk containers- Non-dangerous goods.
4 Materials, design and construction requirements 4.1 Materials FIBCs may be manufactured from a considerable variety of sheet and woven materials. The properties of the selected materials may be further modified by suitable additives, e.g. to improve the exposure life and strength and to reduce the effect of static electricity. All materials of construction shall, after complete immersion in water for not less than 24 h, retain at least 85 % of the tensile strength measured after conditioning to equilibrium at 67 % relative humidity or less. The tensile strength should be measured by the method of test appropriate to the material used. NOTE For example, ISO 13934-1 specifies tensile strength test requirements for tensile properties, seam tensile properties, tear properties and seam slippage for textile fabrics. All load-bearing materials of the FIBC shall after being tested in accordance with the test described in Clause 4.5, retain at least 50 % of the original values for breaking force and elongation of the materials. The use of like materials in the manufacture of FIBCs is recommended to promote recyclability. 4.2 Design The FIBC shall be designed so that the maximum design height of fill shall not exceed the minimum base width or diameter by more than the ratio of 2:1. NOTE Inner liners may be provided.
4.3 Construction All stitched seams and joints shall be locked off, or back sewn or a minimum 20 mm tail provided. All sewing threads shall be of manmade fibre. 4.4 Ultraviolet protection Protection against ultraviolet radiation shall be provided by the addition of carbon black or other suitable inhibitors. These additives shall be compatible with the materials to be carried in the FIBC. For polyolefins, the protection provided by a loading of 0.3 % by mass of an appropriate benzophenone shall represent the minimum ultraviolet stabilization required. Other types of ultraviolet stabilizers, such as benzotriazoles and hindered amines, may be employed, singly or in combinations, provided they exhibit similar protection to the benzophenone type stabilizers at the loading specified above. For other materials sufficient ultraviolet stabilizers shall be added to the material to ensure ultraviolet resistance at least equal to that required for polyolefins. 4.5 UV resistance test The apparatus for testing resistance to UV degradation shall be in accordance with ASTM G154-98, using a UV-B lamp. AS 3668 pdf download.