1、STDmBSI BS EN IS0 12017-ENGL L97b lb24bb7 057537b 892 BRITISH STANDARD Plastics - Poly( methyl methacrylate) double- and triple-skin sheets - Test methods ICs 83.140 NO COPYING WITHOUT BSl PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN IS0 12017 : 1996 STD-BSI BS EN IS0 12017-ENGL 199b 1b24bb
2、7 0575397 727 AmdNo. The foilowing BSI references reiate to the work on this standard: Committee reference PRY76 Draft for comment 93B02918 Dc ISBN O 680 26602 8 BS EN IS0 12017 : 1996 Date Text afected Committees responsible for this British Standard The preparation of this British Standard was ent
3、rusted to Technid Committee PRv75, Piastia and rubber films and sheets, upon which the foliowing bodies were represented Brikh PMcs Fededon Her Mqestys Stationery fce Wht of lhing standards Admhktmh on Ministry of Defence Packaging and Industrial Films Association PIRA International This British Sta
4、ndard, having been prepared under the direclion of the Sector Board for Materiais and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 December 1996 O BSI 1996 Amendments issued since publication STD-BSI BS EN IS0 L20L7-ENGL L77b m Lb24bb7 0575378 bb5 m
5、 BS EN IS0 12017 : 1996 Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 3 2 Nonnative references 3 3 Definitions and abbreviations 4 Composition of materials 6 Characteristics 4 5 5 6 Testmethods 5 7 Condensate formation 8 Annexes A (normative) Determination of l
6、uminous txansmittmce of PMMA double- B (normative) Bending test to examine the chemical compatibility of PMMA with other materials 15 ZA (normative) Normative references to international publications with their relevant European Dublidons 17 and triple-skjn sheets 12 Figures 1 2 3 Example of a doubl
7、eskin sheet Example of a doubleskin sheet Example of a tripleskin sheet 4 4 4 4 9 6 9 6 Curvature of sheet surface 10 Examples of typical dimensions and mass per unit area of DSS Examples of typical dimensions and mass per unit area of TSS 7 8 Three-point bending test Curvature of edge in extrusion
8、direction 11 11 A.1 integrating sphere for measuring light transmittance TA (determination of Ex) 14 B.l Bending test for chemical compatibility 16 O BSI 1996 i - STD.BSI BS EN IS0 LZUL7-ENGL 1776 LbZqbb7 0575377 5TL m BS EN IS0 12017 : 1996 National foreword This British Standard has been prepared
9、by Technical Committee PRL75 and is the English language version of EN IS0 12017 : 1996 Plastics - PoZy(methyZ methacrylate) double- and triple-slcin sheets - Test methods, published by the European Committee for Standardization (CEN). It is identical with IS0 12017 : 1995 published by the Inteniati
10、onal Organization for Standardization (ISO). EN 12017 : 1996 was produced as a result of international discussions in which the United Kingdom took an active part. Cross-references Publication referred to EN 201422 : 1993 (Is0 12 : 1991) EN IS0 1403 : 1995 (IS0 1403 : 1995) IS0 28591 : 1989 IS0 4892
11、-2 : 1994 Corresponding British Standard BS EN 20140 Acoustics. Measurement of sound insuhtion in budings and of buding elements Part 2: 1993 Demrnination, The profile of a sheet is defined collectively by the characteristics specified in 5.1 and examples are b) all details necessary to identify the
12、 sample used shown in figures 4 and 5. for the tests. - STD-BSI BS EN IS0 L20L7-ENGL 179b LbZYbbS 0575LiOLi 799 Page 6 EN IS0 12017 : 1996 6.1.3 Preparation of test specimens Specimens shall be prepared in accordance with the procedures described in IS0 281 8 wherever applica- ble. 6.2 Thickness mea
13、surements 6.2.1 Total thickness Measure the total thickness, to the nearest 0,l mm, at 200 mm intervals over the whole extrusion width, beginning at the central point of the edge cell. Calcu- late the average of the measurements. 6.2.2 Minimum skin thickness Measure the thickness of the outer skins,
14、 to the nearest 0.1 mm, at the point of minimum thickness. Do not report the thickness of the inner skin of a TSS; however, check to ensure that the inner skin is intact. 6.2.3 Minimum rib thickness Measure the rib thickness, to the nearest 0,l mm, at the thinnest point of the thinnest rib. 6.2.4 Te
15、st report The test report shall include the following measure- ments, accurate to 0,l mm: al b) CI the average total thickness, minimum thickness and maximum thickness; 6.5 Mass per unit area Weigh, to the nearest 1 g, strips with a width corre- sponding to the extrusion width and 100 mm in length.
16、Calculate the mass per unit area, pA, in kilograms per square metre, from the equation x13 WX100 where m W is the mass, in grams, of the specimen; is the width, in millimetres, of the speci- men. Report the value of pA calculated from the above equation to the nearest 0,Ol kg/m2. 6.6 Curvature of sh
17、eet surface Measure the curvature on a full-size sheet, using a 1 000-mm-long straight edge (see figure6). Place the specimen, in the vertical position (extrusion direction horizontai), on a plane horizontal surface, and hold it upright. Place the straight edge against the concave surface of the she
18、et and measure the maxi- mum distance a between the sheet surface and the straight edge (1 O00 mm secant line of the curvature) in the extrusion direction. Similarly, measure the maximum curvature b at the cut ends (perpendicular to the extrusion direction). If the width is less than 1 O00 mm, measu
19、re the curvature b over the full width. the minimum outer-skin thickness: Report the distances measured. the minimum rib thickness. NOTE 1 The sheet is normally longer than 1 O00 mm. 6.3 Width and length measurements Measure the extrusion width, the cut width (if neces- sary) and the sheet length in
20、 the extrusion direction to the nearest 0,l mm. Report the width and the length measured. 6.4 Rib geometry Report the nominal values of the rib spacing, the rib angles and any other relevant rib-geometry parame- ters. 6.7 Curvature of edge in extrusion direction Measure the edge curvature on a full-
21、size sheet at the side edges, using a 1 000-mm-long straight edge (see figure 7). Place the test sheet in the horizontal position on a plane horizontal surface so that the sheet lies concave side down. Measure the maximum distance c be- tween a side edge of the sheet and the straight edge. Report th
22、e distance measured. STD-BSI BS EN IS0 L2017-ENGL L77b = Lb2VbbS 0575405 b25 = 6.8 Optical properties 6.8.1 Luminous transmittance Measure the luminous transmittance by the method described in annex A. NOTES 2 Luminous transmittance of DSS and TSS cannot be measured accurately by the method given in
23、 IS0 134681 :LI, Plastics - Determination of the total lu- minous transmittance of transparent materials - Pan 7: Singlebeam instrument. Due to the complex geometry of DSS and TSS, it does not necessarily give reliable values. 3 A spectrometer does not give reproducible results ei- ther. 6.8.2 Colou
24、r The method used for the determination of colour and colour variations shall be agreed on between the in- terested parties. - - 6.8.3 Appearance _. - = Any defects shall be evaluated by inspecting the sheet under daylight or a daylight-type fluorescent lamp with a colour temperature of 6 500 K f 65
25、0 K and rated at not less than 40 W. Examples of defects are: - II * * v, a) bubbles; b) cracks; c) crazing. 6.8.4 Test report The test report shall include the following information, when measured: a) the luminous transmittance; b) the colour and colour variation; cl details of any defects in appea
26、rance. 6.9 Thermal resistance Measure the thermal resistance in accordance with IS0 8302 and report. Page 7 EN IS0 12017 : 1996 6.10 Three-point bending test The bending test is an important criterion in assessing sheet quality and judging the consistency of the extrusion process. 6.10.1 Procedure U
27、se specimens 100 mm long in the extrusion direc- tion. If the extrusion width is between 600 mm and 800 mm, use the whole width for the specimens. If the extrusion width is greater than 800 mm, cut the specimen to 800 mm, taking it from any part of the total width. Carry out the test using a dynamom
28、eter (preferably instrumented) in the following way (see figure 8): Place the specimen symmetrically on two supports (edge radius 5 mm) spaced at 550 mm. Apply the load at the centre of the specimen, evenly over its entire length (100 mm), using a loading edge (radius 5 mm) pressing against a rubber
29、 mat (250 mm x 100 mm x 20 mm, nominal Shore A hard- ness 70) placed on the specimen. NOTE 4 The rubber mat is necessary in order to distrib- ute the load over a larger surface area and hence avoid the skin in contact with the loading edge breaking. Start up the dynamometer, using a rate of ad- vanc
30、ement of the loading edge of 100 mm/min f 5 mmlmin. The load is measured by the dynamometer while the deflection is measured to the nearest 0.1 mm by a control gauge. Continue the test until the specimen fails, either as a result of fracture or by slipping through the supports. 6.10.2 Evaluation cri
31、terion for the bending test The load-bearing capacity of the specimen is deemed sufficient when the following conditions are satisfied: Pva Pmin PV H“ 2 Smin - where Pv is the load on failure, in newtons; 2) To be published. Page 8 EN IS0 12017 : 1996 Pmi, H, is the required value of Pv, in newtons;
32、 is the deflection on failure, in millimetres; S, is the required value of Pv/Hv 6.10.3 Test report Report the values of P, and Pv/Hv, plus the dimensions of the specimen. conditions under which such materials will be permitted to come in contact with DSS or TSS. 6.14.2 Test report The test report s
33、hall include the following information: a) the temperature used (23 C or 50 “Cl; b) whether the crazing time was longer or shorter than 24 h; 6.1 1 Sound insulation c) the stress limit; Carry out the test in accordance with IS0 140-1, IS0 140-2 and IS0 140-3 and report. d) whether the corrosive agen
34、t or other material was found to be compatible or not. 6.12 Fire resistance 6.15 Evaluation of internal stress Assess fire behaviour as specified in relevant national standards. 6.13 Weathering test Carry out weather-resistance tests as specified in IS0 4892-2, using a filtered xenon lamp ( the pe r
35、iod of exposure shall be 3 O00 h. Use a specimen measuring 64 mm x 40 mm. Examine for the presence of defects (e.g. cracks, crazing or yellowing) at the end of the exposure period and report. 6.14 Chemical resistance to (compatibility with) materials in contact with DSS or TSS Materials of this cate
36、gory are e.g. gaskets, sealants, etc. 6.14.1 Procedure Carry out the bending test specified in annex B to qualify such materials as being inert with respect DSS or TSS (.e. not producing crazing under stress). Cut specimens from solid extruded sheets 4 mm thick consisting of the same material as the
37、 DSS or TSS with which compatibility is to be established. The longer side of the specimen shall be parallel to the extrusion direction. The shrinkage of specimens in the extrusion direction, determined in accordance with IS0 7823-2:1989, annex B, shall be no more than 3 %. NOTE 5 It is left to the
38、interested parties to agree, de pending on the results of the compatibility test, on the This test gives an indication of the level of internal stress within the material. A specimen is immersed for 10 min in ethyl acetate and subsequently exam- ined for the appearance of cracks or crazing. This is
39、only suitable as a qualification test for freshly extruded material. During prolonged storage or in use, the DSS or TSS absorbs an undefined amount of water. This increased undefined water content causes irregulari- ties in the described test. If the stress conditions fol- lowing prolonged storage o
40、r use are to be investigated, then the procedure and the specimen conditioning shall be agreed on between the inter- ested parties. NOTE 6 stress is highest in the edge zones. Previous experience has shown that the internal The specimen used shall be of full width and 100 mm in length. Immerse each
41、edge of the specimen, one after the other, over the whole length (100 mm), at least 50 mm deep into analyticalgrade ethyl acetate for 10 min. In cases of dispute, condition a specimen at least 300 mm wide and 100 mm long for at least a day in a dessicator at 23 “C Il C. Then immerse the edges of the
42、 specimen at least 50 mm deep in ethyl acetate for 10 min at a temperature of 23 “C f 1 “C. Examine the specimen for cracks or crazing after im- mersion of each edge and report. 7 Condensate formation condensate formation is occasionally observed fol- lowing changes in the atmospheric conditions (.e
43、. temperature and humidity). Condensate can form on STD-BSI BS EN IS0 12017-ENGL 1776 1b24bb9 0575407 4T 4 Kn 4 Page 9 EN IS0 12017 : 1996 the external and/or internal surfaces of the DSS or property of the DSS or TSS, but depends solely on the TSS. Condensation first appears in the form of fine phy
44、sical conditions (temperature, humidity, dew point) droplets which scatter the light and makes the fogged at the surface of the DSS or TSS. areas appear white. This fogging reduces light trans- mission, but has virtually no effect on the other prop- For these reasons, this International Standard doe
45、s erties of the DSS or TSS (including heat insulation). not specify a method for the measurement of The formation of condensate in this way is not a condensate. I I Total thickness T= 16 mm Total width Mass per unit area Skin thickness Rib thickness Rib spacing W = 700 mm pA = 5 kg/mz 5 = 1.8 mm tR1
46、 = 1.7 mm hz = 1.8 mm 4, = 20 mm h2 = 24 mm h3 = 30 mm (main rib spacing) Figure 4 - Examples of typical dimensions and mass per unit area of DSS W Total thickness T= 16 mm Total width W= 980 mm Mass per unit area pA = 5 kg/mz Skin thickness is = 1,5 mm Internal skin thickness r, = 1,2 mm Rib thickn
47、ess zR, = 1.6 mm fR2 = 1,5 mm dAZ = 24 mm dR3 = 32 mm (main rib spacing) Rib spacing 4, = 20 mm Figure 5 - Examples of typical dimensions and mass per unit area of TSS STD-BSI BS EN IS0 L20L7-ENGL L77b m LbZYbbS 0575408 334 m Page 10 EN IS0 12017 : 1996 B A Horizontal plane surface u Curvature in ex
48、trusion direction b E Extrusion direction Double- or tripleskin sheet in vertical position, resting on A Curvature perpendicular to extrusion direction Figure 6 - Curvature of sheet surface STD*BSI BS EN IS0 LZClL7-ENGL L77b LbZ+bbS 0575+OS 270 Q Page 11 EN IS0 12017 : 1996 275 275 b I - sa B Double
49、- or tripleskin sheet in horizontal position, resting on A - A Horizontal plane surface I c Curvature of edge in extrusion direction E E = _. E Extrusion direction - - Figure 7 - Curvature of edge in extrusion direcon * * rn A D/ Dimensions in millimetres I -1 A Loading edge (edge radius 5 mm) D Rubber mat B Double- or tripleskin sheet specimen (max. width 800 mm) E Extrusion direction C Supports (edge radius 5 mm) u = b = (width - 550)/2 mm Figure 8 - Three-point bending test STD-BSI BS EN IS0 LZOL7-ENGL L77b m Lb24bb7 0575410 T92 m Page 12 EN IS0 12017 :
