ISO 14632:2021 pdf download – Extruded sheets of polyethylene (PE-HD) — Requirements and test methods.
6.1.2 Conditioning All test specimens shall be conditioned for at least 16 hours in accordance with ISO 291. Shorter conditioning times shall be used by agreement between the interested parties when it can be shown that there is no significant difference in the results obtained. 6.1.3 Testing Testing shall be carried out in accordance with ISO 291, unless agreed differently between the interested parties or specified differently in the individual testing standards. 6.2 Delivery condition Sheets should be visually examined when delivered to ensure freedom from mechanical damage or other obvious defects. Sheets can be inspected by means of ultrasonics or X-rays where required. 6.3 Appearance Where possible, sheets shall be examined for visual defects by transmitted light using a suitable light source. Otherwise, sufficiently bright reflected light should be used. Any defects thus identified shall be compared with the agreed specification (either in written or sample form) and sentenced accordingly.
6.4.4 Bow of sheets in rolled form For sheets in rolled form, the bow shall be determined after the sheets have been pulled freely from the rolls and measured against a straight line. The bow shall be measured to the nearest 1 mm using a suitable calibrated equipment. 6.5 Density Density shall be determined in accordance with ISO 1183-1, ISO 1183-2 and ISO 1183-3. 6.6 Tensile stress at yield (σ y ) and tensile strain at yield (ε y ) Tensile stress at yield, σ y , and tensile strain at yield, ε y , shall be determined using at least five type 1B test specimens in each direction in accordance with ISO 527-1 and ISO 527-2 using a test speed of 50 mm/min ± 5 mm/min. 6.7 Modulus of elasticity in tension (E t ) Modulus of elasticity in tension, E t , shall be determined using at least five type 1B test specimens in each direction in accordance with ISO 527-1 and ISO 527-2 using a test speed of 1 mm/min ± 0,2 mm/ min. 6.8 Charpy impact strength of notched specimens (a cn ) Charpy impact strength of notched specimens, a cn , for nominal thicknesses ≥4 mm shall be determined in accordance with ISO 179-1 and ISO 179-2 using at least 10 test specimens in each direction. 6.9 Melt mass-flow rate ( MFR ) Melt mass-flow rate (MFR 190/ 5) shall be determined in accordance with ISO 1133-1 and ISO 1133-2. 6.10 Determination of shrinkage after heating At least three test specimens with dimensions of 100 mm × 100 mm shall be cut from the centre and two sides of the sheet. The side test specimens shall be taken at least 50 mm from the edge of the sheet. The extrusion direction of the sheet shall be marked on the specimens at a minimum of two places. The initial length, L O , in the direction of extrusion shall be measured on the marked places with an accuracy of 0,1 mm after conditioning of the specimens in accordance with ISO 291. The specimens shall be dusted with kaolin and shall be placed flat on a kaolin bed in an oven with air circulation. The temperature and duration of the test are shown in Table 5 and Table 6.
ISO 14632:2021 pdf download – Extruded sheets of polyethylene (PE-HD) — Requirements and test methods
