BS 2782-0:2004 pdf free.Methods of testing plastics—Introduction.
BS 2782-0 This part of BS 2782 gives a general introduction to the methods of test for plastics some of which arepresented in the other Parts.Annex A lists the individual methods and Annex B describes an obsolescentmethod (508A), formerly given in BS 2782:1970 and still referred to by the Building Regulations.
This part of BS 2782 refers to other publications that provide information or guidance. Editions of thesepublications current at the time of issue of this standard are listed in the Bibliography, but referenceshould be made to the latest editions.
The IS0 test methods adopted as British Standards together with the methods in BS 2782 provide arationalized collection of methods for testing plastics materials and includes tests that are applied tomoulding and extrusion compounds, synthetic resins, reinforced plastics,semi-fabricated products such assheet, film, rod and tube, and finished articles in the form of mouldings and extrusions.Many of the methods are restricted to one set of conditions, and are not necessarily adequate for the production ofdesign data; attention is therefore drawn to BS 4618.The acquisition and presentation of comparable datafor properties of plastics is given in BS EN ISO 10350 and BS EN ISO 11403.Many of the methods are notsuitable for cellular plastics.
Numerical values in BS 2782 are normally expressed in the units of the Systeme Internationald’Unites (SI units), described in ISO 1000.
Apparatus used should comply with the requirements of the appropriate British Standard.Reagentsshould be of recognized analytical reagent quality unless otherwise stated, and distilled or demineralizedwater should be used wherever water is specified (see BS EN ISO 3696).
In cases where special precautions are needed to ensure that the test pieces adequately represent theproperties of the material in bulk, a sampling procedure is given in the specification for the material.
lt is recognized that specifications for test programmes sometimes require use of different numbers of testpieces from those given in the test method standard.For example, in production, a more informative andaccurate result can be obtained if fewer test pieces are taken from one article but more articles are tested.It should be noted, however, that in general, the use of fewer test pieces yields less reliable results.
8 Preparation of test pieces
Preparation of test pieces is often one of the most critical stages of the test procedure, and the specifiedconditions of preparation should be adhered to. In general the procedure adopted enables a test piecerepresentative of the material under test to be obtained with minimal effect on the properties of the
material.Test piece preparation is normally referred to in each test method standard, usually by referenceto general methods of preparation (see Annex A) or by reference to standards for the materials or products.lIt should be noted that, where no British Standard or other recognized specification exists, the procedureshould be as agreed between the interested parties.BS 2782-0 pdf download.