1、 AECMA STANDARD prEN 3656 NORME AECMA Edition P 1 AECMA NORM August 2001 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES - STANDARDIZATION (AECMA-STAN) Gulledelle 94 - 8-1200 BRUXELLES - Tel. (+32) 2 775 81 1 O - Fax. (+32) 2 775 81 11 Comments should be sent within six months after th
2、e date of publication to AECMA-STAN Gulledelle 94 8-1200 BRUXELLES ICs: Material Domain Mr Pays Descriptors: ENGLISH VERSION Aerospace series Polycarbonate, self-extinguishing, low smoke emission Characteristics Srie arospatiale Polycarbonate autoextinguible, avec faible densit de fume Caractristiqu
3、es Luft- und Raumfahrt Polycarbonat, flammgeschtzt, raucharm Eigenschaften This Yerospace Series“ Prestandard has been drawn up under the responsibility of AECMA-STAN (The European Association of Aerospace Industries - Standardization). It is published on green paper for the needs of the European Ae
4、rospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-
5、identification of the standard. After examination and review by users and formal agreement of AECMA-STAN it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. Edition approved for publication 2001-08-31 Page 2 prEN 3656: 2001 Blank page e
6、Page 3 prEN 3656: 2001 e1 Scope I This standard specifies the characteristics of self-extinguishing and low smoke emission semi-finished polycarbonate sheets with and without UV radiation protection requirement, as used for aircraft equipment, such as internal panelling, simple internal glazing, sou
7、nd-proofing panels, light covers etc. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated referenc
8、es, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. IS0 554 EN 2719 EN 3779 Standard atmospheres for conditionin
9、g andlor testing - Specifications Aerospace series - Polycarbonate sheet - Technical specification 4) Aerospace series - Polycarbonate sheet - Dimensions 1) 3 Field of application 3.1 Typical application Extruded sheet of the thermoformed moulded parts for aerospace components which are not required
10、 to meet regulations concerning heat emission in case of fire 3.2 Material condition For colourless or coloured transparent material, up to 20 % of clean reprocessed material may be used. For coloured opaque material, up to 50 % of clean reprocessed material may be used. 3.3 Surface finish Smooth or
11、 textured 4 Required characteristics See tables 1 to 3. For qualification testing, all characteristics called for in this material standard shall be substantiated by performing tests on 3 production batches. For acceptance testing, all tests identified in footnote in tables 1 to 3 shall be performed
12、. 5 Designation See EN 3779. 1) Published as AECMA Prestandard at the date of publication of this standard Page 4 prEN 3656: 2001 Characteristics 6 Technical specification See EN 2719. Units min. max. Table 1 - Physical tests 1 EN 2719, see 4.9. 1 i 2 i 3 Tensile stress at yield Tensile strain at yi
13、eld Modulus of elasticity MPa 50 - % 55 - MPa 2 O00 - Density a Temperature of deflection under load Vicat softening temperature Linear coefficient of thermal expansion 1,18 “C 128 - “C 140 - 1 /K 65 x io- - 1,24 e Only for sheets with thickness 24 mm - Deep drawing characteristics l- - 1 30 Water a
14、bsorption I mg I Impact strength No rupture Page 5 prEN 3656: 2001 Column Table 2 - Optical tests 1 2 2 3 4 No. I Characteristics I min. Refractive index ng 159 transmission at Visible light 2 mm 73 - 72 - 3 mm 6 mm 72 - 12 mm 69 - Optical defects a r 5 6 1 I Optical characteristics Values to be agr
15、eed between the customer and manufacturer Optical deviation a Optical distortion a Column No. 1 2 1 2 3 Characteristics Units max. Resistance to external influences Flammability a - Category (a) and (b) a For cotourless types only 1 O0 within 1,5 min Table 3 - Flammability tests 200 within 4 min aft
16、er 4 min 150 4 l- 3 I Smoke density with flames a Fume gas components with flames a 10 “_1 SOz/HzS NO + NO2 4 PPm ;p 1 O0 a Specimen thickness as produced These values are to be demonstrated during acceptance testing of the production batch. The fume gas components to be determined shall be agreed between the customer and the manufacturer.
