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Guidelines on Hull Structure of Thermoplastic Vessels 2021 Table 2.2.1 (b): Properties of LDPE and MDPE Property Density Melt index Tensile yield stress Elasticity modulus in tensile yield Tensile creep strength Flexural Strength Flexural Modulus Compressive Strength Shear Strength Hardness Impact strength (drop test without notch) Notch impact strength (pendulum test with notch) Pore contents Impact tensile strength of aged material Requirement LDPE < 0.930 Stated value ±1.0 Though max. 3.5 min. 7.5 min. 4.5 min. 180 max. 2.5 at stress 2.0 8-15 250 9.6 8 Stated value ±3 min. 15 No brittle fracture max. 15 max. 20 No brittle fracture min. fracture energy 1.0 J/cm3 Requirement MDPE 0.930 - 0.945 Same as LDPE min 13.0 min 8.0 min. 350 2.0 at stress 3.0 20 500 15 12 Same as LDPE min. 15 No brittle fracture Same as LDPE Same as LDPE Same as LDPE J/cm2 Unit g/cm3 g/10 min. N/mm2 N/mm2 N/mm2 % N/mm2 N/mm2 N/mm2 N/mm2 N/mm2 Shore D J/mm thickness Visual % of thickness % of thickness Visual Comments At 20 At 65°C At 20°C Deformation after 100 hours at 20°C Tested at 20°C and read after 15 sec. Freely supported test piece 0°C Required only for vessels with single skins 0°C In structural parts In the vessel elsewhere Aged material corresponding to 4 years of natural ageing, tested at 0°C and with a test speed 2 x 105 %/mm Indian Register of Shipping IRS-G-DES-12 Page | 6PDF Image | Hull Structure of Thermoplastic Vessels 2021
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