BS ISO 15527:2010 pdf free download Plastics — Compression- moulded sheets of polyethylene (PE-UHMW, PE- HD) — Requirements and test methods
This International Standard specifies the requirements and test methods for solid flat compression-mouldedsheets of polyethylene (PE-UHMW and PE-HD, see ISO 1043-1) without *fillers or reinforcing materials.ltapplies only to thicknesses from 10 mm to 200 mm.
Normative references
The following referenced documents are indispensable for the application of this document.For datedreferences,only the edition cited applies. For undated references,the latest edition of the referenceddocument (including any amendments) applies.
ISO 179-1, Plastics — Determination of Charpy impact properties — Part 1:Non-instrumented impact testISO 291,Plastics -Standard atmospheres for conditioning and testing
ISO 527-2,Plastics — Determination of tensile properties —- Part 2: Test conditions for moulding andextrusion plastics
ISO 1133, Plastics —Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) ofthermoplastics
ISO1043-1,Plastics — Symbols and abbreviated terms—- Part 1: Basic polymers and their specialcharacteristics
ISO 1183 (all parts),Plastics — Methods for determining the density of non-cellular plastics
ISO 1872-1,Plastics — Polyethylene (PE) moulding and extrusion materials — Part 1: Designation systemand basis for specifications
ISO 11542-1,Plastics — Ultra-high-molecular-weight polyethylene (PE-UHMW)moulding and extrusionmaterials —Part 1 : Designation system and basis for specifications
ISO 11542-2,Plastics — Ultra-high-molecular-weight polyethylene (PE-UHMW)moulding and extrusionmaterials — Part 2: Preparation of test specimens and determination of properties
Material
Sheets shall consist of PE-UHMW moulding materials as defined in ISO 11542-1 or PE-HD selected frompolyethylene (PE)moulding materials as defined in ISO 1872-1,without fillers or reinforcing materials.Materials and additives of unknown identity shall not be used.
NOTE Legal conditions may necessitate a specific choice of moulding material (see 4.3.2).
4Requirements4.1Appearance
Sheets shall have smooth surfaces.Small grooves and any resultant rregularities in the thicknesses of sheetsare acceptable as long as the requirements specified in 4.2.1 are fufilled.Sheets shall be examined inaccordance with 5.3.
Where agreed between the interested parties, sheets with a smooth machined surface may be supplied.
Sheets shall be substantially free from bubbles, blowholes and other inhomogeneities which would make themunfit for the intended use. Specific requirements with respect to this internal integrity shall be agreed uponbetween the interested parties.Sheets shall be examined in accordance with 5.2.
4.2Dimensional tolerances
4.2.1 Thickness
For any individual sheet, the thickness tolerance with reference to the nominal thickness shall be as specifiedin Table 1.Testing shall be in accordance with 5.4.1.
4.2.2 Length and width
The nominal length, l n , and nominal width, b n , of sheets shall be as agreed between the interested parties.
4.2.3 Rectangularity
For any individual sheet, selected at random from any delivery, the rectangularity tolerance, expressed as the difference in length of the diagonals, ⎪ d 1 − d 2 ⎪ (see Figure 1 ), shall be in accordance with Table A.1 .
Testing shall be in accordance with 5.4.3.
4.3 Properties
4.3.1 Physical properties
Requirements for physical properties are given in Table 2.
4.3.2 Physiological behaviour
Any relevant legislation for physiological behaviour shall be taken into consideration.
5 Test methods
5.1 Test specimens
5.1.1 Preparation of test specimens
For sheets of thickness W 1 0 mm but u 20 mm, the test specimens shall be taken as shown in Figure 2, and for sheets of thickness > 20 mm but u 200 mm they shall be taken as shown in Figure 3.
5.1.2 Conditioning All test specimens shall be conditioned for at least 1 6 h at 23 °C ± 2 °C in accordance with ISO 291 or as specified in the appropriate material standard. Shorter conditioning times may be used by agreement between the interested parties when it can be shown that there is no significant difference in the results obtained.
5.1.3 Testing Testing shall be carried out in standard atmosphere 23/50 as specified in ISO 291 or as specified in the appropriate material standard, unless otherwise agreed between the interested parties or specified in the individual test standards.
5.2 Delivery condition Sheets shall be visually examined when delivered to ensure freedom from mechanical damage or other obvious defects. Sheets can be inspected by ultrasonic or X-ray methods where required. 5.3 Appearance Where possible, sheets shall be examined for visual defects by transmitted light using a suitable light source. Otherwise, sufficiently bright reflected light shall be used. Any defects thus identified shall be compared with the agreed specification (which may be either a written specification or in the form of reference samples) and classified accordingly.