ISO 180:2000 pdf download – Plastics — Determination of Izod impact strength.
6.1.2 Sheets Specimens shall be machined from sheets in accordance with ISO 281 8. Whenever possible, specimens with notch A shall be used. The machined surface of unnotched specimens shall not be tested under tension. 6.1.3 Long-fibre-reinforced materials A panel shall be prepared in accordance with ISO 1 268 or another specified or agreed upon preparation procedure. Specimens shall be machined in accordance with ISO 281 8. 6.1.4 Checking The specimens shall be free of twist and shall have mutually perpendicular parallel surfaces. The surfaces and edges shall be free from scratches, pits, sink marks and flash. The specimens shall be checked for conformity with these requirement by visual observation against straightedges, squares and flat plates, and by measuring with micrometer callipers. Specimens showing measurable or observable departure from one or more of these requirements shall be rejected or machined to proper size and shape before testing. 6.1.5 Notching 6.1.5.1 Machined notches shall be prepared in accordance with ISO 281 8. The profile of the cutting tooth shall be such as to produce in the specimen a notch of the contour and depth shown in Figure 2, at right angles to its principal axes. The notch profile shall be checked at regular intervals. 6.1.5.2 Specimens with moulded-in notches may be used if specified for the material being tested. Specimens with moulded-in notches do not give results comparable to those obtained from specimens with machined notches. The notch profile shall be checked at regular intervals. 6.2 Anisotropy Certain types of sheet or panel material may show different impact properties depending on the direction in the plane of the sheet or panel. In such cases, it is customary to cut groups of test specimens with their major axes respectively parallel and perpendicular to the direction of some feature of the sheet or panel which is either visible or inferred from knowledge of the method of manufacture.