BS 4060:2006 pdf download – Pressed wool felts – Specification

BS 4060:2006 pdf download – Pressed wool felts – Specification 3.1felt fabric characterized by the entangled condition of most, or all, of thefibres of which it is composed 3.2general purpose felt felt used for packaging, clothing, decorative and similar purposes3.3precision felt felt used in engineering applications, where close tolerances arenecessary 3.4 pressed felt felt formed from a web or batt containing animal hair or wool,consolidated by the application of heat and mechanical action thatcauses the constituent fibres to mat together 3.5white felt felt that has the colour of natural,unpigmented wool NOTE White felts are used where visual appearance is important.3.6grey felt felt, the colour of which has been obtained from using mixtures ofcoloured wools and other fibres 4 Material requirements Felts shall be manufactured from wool, or mixtures of wool with naturalor man-made fibres. The minimum wool content shall be as specified inTable 1 and Table 4. NOTE The fibres should be blended, carded and felted to form a uniformproduct substantially free from permanent ridges and cveases. The procluct should be fvee from all non-fibrous agents, e.g. stiffening, loadingor reinforcing agents of any kind. 5 Designation Felts shall be designated by a condensed technical description (seeTable 1 and Table 4) containing the following: a) a first letter to indicate whether the felt is general purpose (A) or precision (B); b) a number, consisting of two digits, to indicate the minimum percentage wool content; c) an oblique stroke; d)a single digit number, 1 to 8, to indicate the hardness or density grade; e) a letter to indicate the colour white (W), grey (G) or dyed (D).NOTE If appropriate，interested parties can agree to inclde the additional designations in Table 6 and Table 7 in order to indicate thatparticular chemical and/or phgsical recuirements have been conformedto (see 6.4 and 6.5). EXAMPLE 1: The designation, A75/1W, indicates that the felt is general purpose, with 75% wool content, extra hard and white. EXAMPLE 2 The designation, B97/1G6.1–6.6, indicates that the felt is a precision felt with 97% wool content, extra hard, grey, having a minimum breaking strength of 5.5 MPa and having chemical properties conforming to 6.1 to 6.6 of Table 6. 6 Performance requirements 6.1 General purpose felts General purpose felts, including packaging felts, shall conform to Table 1 and Table 2. NOTE Commonly manufactured thicknesses are 1 mm, 3 mm, 5 mm, 10 mm, 15 mm, 20 mm and 25 mm but other...