1、BRITISH STANDARD BS3944-1: 1992 Colour and diffusion filter material for theatre, television and similar entertainment purposes Part 1: Specification for flammability and dimensional stabilityBS3944-1:1992 This British Standard, having been prepared under the directionof the Cinematographyand Photog
2、raphyStandards PolicyCommittee, was publishedunder the authority ofthe Standards Board and comesinto effecton 15 August1992 BSI07-1999 The following BSI references relate to the work on this standard: Committee referenceCPM/3 Draft for comment88/36903DC ISBN 0 580 20967 9 Committees responsible for
3、this British Standard The preparation of this British Standard was entrusted by the Cinematography and Photography Standards Policy Committee (CPM/-) to Technical CommitteeCPM/3, upon which the following bodies were represented: Association of British Theatre Technicians Association of Manufacturers
4、 Allied to the Electrical and Electronic Industry (BEAMA Ltd.) British Broadcasting Corporation British Film Institute British Kinematograph, Sound and Television Society Broadcasting Entertainment and Cinematograph Technicians Union Chartered Institution of Building Services Engineers Chief and Ass
5、istant Chief Fire Officers Association Cinema Exhibitors Association Defence Manufacturers Association Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Electrical, Electronic, Telecommunications and Plumbing Union Home Office ITV Association Lighting Industry Federation Ltd.
6、National Association of Theatrical, Television and Kine Employees National Illumination Committee of Great Britain National Radiological Protection Board Royal Photographic Society Society of Television Lighting Directors Amendments issued since publication Amd. No. Date CommentsBS3944-1:1992 BSI 07
7、-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Normative references 1 3 Dimensional stability 1 4 Flammability 1 5 Marking 1 Annex A (normative) Method of test for dimensional stability 2 Annex B (normative) Method of test for the flammability of a small incl
8、ined piece of filter material 2 Annex C (normative) Procedure for assessing the results obtained in Annex B 2 Annex D (normative) Method of test for the flammability of a strip of filter material 2 Annex E (normative) Procedure for assessing the results obtained in Annex D 2 List of references Insid
9、e back coverBS3944-1:1992 ii BSI 07-1999 Foreword This Part of BS3944 has been prepared under the direction of the Cinematography and Photography Standards Policy Committee. It supersedes BS3944:1965, which is withdrawn. The definitions of standard colours included in the1965 version of the standard
10、 are no longer considered appropriate matters for standardization. The main purpose of Part1 of the revision of this standard is to incorporate the methods of test for the flammability of plastics given in BS2782-1 Methods140D and140E. The revision also introduces requirements for dimensional stabil
11、ity when subject to heat. It is anticipated that compliance with BS3944-1 will be required by entertainment licensing authorities and other safety standards enforcement agencies. Part2 of the standard will consist of additional requirements for colour fastness and consistency. A British Standard doe
12、s not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an insi
13、de front cover, pagesi andii, pages1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS3944-1:1992 BSI 07-1999 1 1 Scope This Part of BS
14、3944 specifies the flammability and dimensional stability characteristics of sheet filter material, normally of flexible plastics or similar material, used to colour, attenuate or diffuse sources of illumination for theatre, television, film or other entertainment and similar applications. 2 Normati
15、ve references This Part of BS3944 incorporates, by reference, provisions from specific editions of other publications. These normative references are cited at the appropriate points in the text and the publications are listed on the inside back cover. Subsequent amendments to, or revisions of, any o
16、f these publications apply to this Part of BS3944 only when incorporated in it by updating or revision. 3 Dimensional stability When tested in accordance with the method described in Annex A, the dimensions shall all lie between145mm and155mm. 4 Flammability 4.1 Flammability of a small inclined piec
17、e of filter material 4.1.1 General When tested in accordance with Annex B and the results assessed in accordance with Annex C the filter material shall conform to4.1.2, 4.1.3 and4.1.4. 4.1.2 Duration of flaming The filter material shall not continue to flame or glow for more than5s after the ethanol
18、 has burned out. 4.1.3 Extent of burning Charring or scorching shall not extend over more than20% of the surface area of the filter material, any hole formed being regarded as part of the charred area. The length of the edge along the top of the filter material which has shown charring or scorching
19、shall not exceed50mm. 4.1.4 Spread of fire Any material which may drop from the filter material shall not continue to burn after it has reached the base of the apparatus. 4.2 Flammability of a strip of filter material 4.2.1 General When tested in accordance with Annex D and the results assessed in a
20、ccordance with Annex E the filter material shall conform to4.2.2, 4.2.3 and4.2.4. 4.2.2 Duration of flaming The filter material shall not continue to flame or glow for more than5s after the ethanol has burned out. 4.2.3 Extent of burning The distance of travel of the flame shall not exceed75mm along
21、 the length of the filter material. 4.2.4 Spread of fire Any material which may drop from the filter material shall not continue to burn after it has reached the base of the apparatus. 5 Marking The material, or the package in which material conforming to this standard is supplied to the purchaser f
22、rom any vendor, shall be labelled with the following: a) the manufacturers name or trade mark or licence number; b) the number and date of this British Standard, i.e.BS3944-1:1992 1) . NOTEIt is important that vendors and purchasers should be able to identify material warranted by the manufacturer a
23、s conforming to this standard. Because it is not usually practicable to mark the material itself, it is recommended that the required identifying marking be provided on packaging or interleaving materials or roll cores using adhesive labels or similar methods. 1) Marking BS3944-1 on or in relation t
24、o a product represents a manufacturers declaration of conformity, i.e.a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is solely the claimants responsibility. Such a declaration is not to be confused with third party certi
25、fication of conformity, which may also be desirable.BS3944-1:1992 2 BSI 07-1999 Annex A (normative) Method of test for dimensional stability Cut three test specimens, consisting of squares with side150mm 1mm, from a sample of the filter material. Place one test specimen on a flat horizontal steel su
26、rface200mm square in an oven at120 C for2h. Remove and allow to cool. Measure the lengths of the sides of the test specimen. Repeat the procedure on the two remaining test specimens. Annex B (normative) Method of test for the flammability of a small inclined piece of filter material From each sample
27、 of filter material prepare and test three test specimens in accordance with BS2782:Method 140E:1982. Annex C (normative) Procedure for assessing the results obtained in Annex B If the results obtained in carrying out the method of test given in Annex B are such that two out of the three test specim
28、ens fail to meet the requirements given in4.1.2, 4.1.3 and4.1.4 the filter material shall be regarded as failing to conform to this standard. If only one test specimen fails to meet the requirements given in4.1.2, 4.1.3 and4.1.4 prepare and test three additional test specimens. If any one of these t
29、hree additional test specimens fails to meet the requirements given in4.1.2, 4.1.3 and4.1.4 the filter material shall be regarded as failing to conform to this standard. Annex D (normative) Method of test for the flammability of a strip of filter material From each sample of filter material prepare
30、and test six test specimens in accordance with BS2782:Method 140D:1980. NOTEBS2782:Method 140D is a test for flammability of thin polyvinyl chloride sheeting. For the purposes of this standard this method may be used for any thin sheet filter material. Where the edge of the test specimen produced by
31、 burning is greater than75mm from the start mark and this edge appears to be the result of melting and not of burning of the material repeat the test, observing that point along the scale at which the edge has ceased both burning and glowing, and record this as the distance of travel of the flame. A
32、nnex E (normative) Procedure for assessing the results obtained in Annex D If the results obtained in carrying out the method of test given in Annex D are such that three or more of the six test specimens fail to meet the requirements given in4.2.2, 4.2.3 and4.2.4 the filter material shall be regard
33、ed as failing to conform to this standard. If two test specimens fail to meet the requirements given in4.2.2, 4.2.3 and4.2.4 prepare and test four additional test specimens. If any one of these four additional test specimens fails to meet the requirements given in4.2.2, 4.2.3 and4.2.4 the filter mat
34、erial shall be regarded as failing to conform to this standard. If one test specimen fails to meet the requirements given in4.2.2, 4.2.3 and4.2.4 prepare and test two additional test specimens. If either of these two additional test specimens fails to meet the requirements of4.2.2, 4.2.3 and4.2.4 th
35、e filter material shall be regarded as failing to conform to this standard.BS3944-1:1992 BSI 07-1999 List of references (see clause2) Normative references BSI standards publications BRITISH STANDARDS INSTITUTION, London BS2782, Methods of testing plastics. BS2782-1, Thermal properties. BS2782:Method
36、 140D:1980, Flammability of a test piece550mm 35mm of thin polyvinyl chloride sheeting (laboratory method). BS2782:Method 140E:1982, Flammability of a small, inclined test piece exposed to an alcohol flame (laboratory method). BS3944-1: 1992 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandar
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