BS ISO 1887:2014 pdf free

BS ISO 1887:2014 pdf free.Textile glass – Determination of combustible-matter content
Unless stated to the contrary or in more detail (i.e. number and location) in the specification or by the person requesting the test, the number of test specimens taken per elementary unit shall be as specified in Table 2.
NOTE The number of test specimens used for each determination of the combustible-matter content can be modified depending on the type of elementary unit, which can come in very different forms. In addition, a determination might have to be repeated at one or more locations in the elementary unit depending on the mass (chopped strands, milled fibre) or the length (fabrics, mats) of the elementary unit being tested. The additional information concerning the number and location of these specimens can be given in the product specification or by the person requesting the test.
Place the holder plus dried specimen in the muffle furnace (4.2), maintained at 625°C±20 °C or at the chosen temperature between 500 °C and 600 °C (see 6.2).
Allow the specimen to burn for 5 min with the door of the furnace open (see notes 1 and 2). Then close the door of the furnace and heat for a further more than 10 min or, if a temperature lowers than 625 °C is used, for at leasta further 1 h.
Remove the holder plus specimen from the furnace and transfer to the desiccator (4.3). Allow to cool to ambient temperature.
Weigh the holder plus calcinated specimen and note the mass to the nearest 0,1 mg (m2).
Repeat the heating, cooling, and weighing operations until constant mass is reached (see, however,note 3).
NOTE1 The door is left open to allow volatile products to escape from the furnace, thus preventing condensible materials being redeposited on the specimen or on the holder.
NOTE2 If a ventilated furnace is used, this open-door time is not necessary.
NOTE3 The test method requires that all weighings be confirmed to be to constant mass by repetition of the drying and calcination stages. In cases in which known materials are being tested regularly, the user of this International Standard is permitted to define, by experimentation, a minimum time for the drying and calcination stages to ensure that constant mass has been obtained.BS ISO 1887 pdf download.