1、DEUTSCHE NORM SeDtember 1998 Determination of chemical resistance of safety glazing materials for road vehicles DIN 52289 - ICs 43.040.60 Descriptors: Road vehicles, safety glazing, chemical resistance, testing. Straenfahrzeuge - Sicherheitsscheiben fr Fahrzeugverglasung - Prfung der Chemikalienbest
2、ndigkeit In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker. Published with the agreement of the Bundesminister fr Verkehr (German Federal Minister of Transport). Foreword This st
3、andard has been prepared by the Normenausschu Materialprfung (Materials Testing Standards Committee) . See Appendix A for connection with ECE Regulation No. 43. All dimensions are in millimetres. 1 Scope This standard specifies two methods of testing the chemical resistance of plastics safety glazin
4、g, glass- plastics safety glazing materials (with the plastics surface facing outwards when installed), as well as glass safety glazing coated with plastic, for use in road vehicles. Method B is used only for testing plastics safety glazing. 2 Normative references This standard incorporates, by date
5、d or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the titles of the publications are listed below. For dated references, subsequent amendments to or revisions of any of these publications apply to this standard
6、 only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. DIN 5001 4 Artificial climates in technical applications - Standard atmospheres DIN EN 21 55-1 9 Aerospace series - Test methods for transparent materials for ai
7、rcraft glazing - Part 19: Determination of craze resistance Gefahrstoffverordnung (German Regulation on dangerous substances and materials), as of 26 August 1986, BGBl. (German Federal Law Gazette) I, pp. 1470-1 487, as amended on 24 June and 19 September 1994 I) Technische Anforderungen an Fahrzeug
8、teile bei der Bauartprfung nach 9 22a StVZO (Technical require- ments to be met by vehicle components in type approval testing according to article 22 of the German Regulation authorizing the use of vehicles in road traffic), No. 29 of 5 July 1973, Bundesverkehrsblatt 1973, p. 558, as amended by Pub
9、lication No. 171 of 1 September 1988 (Bundesverkehrsblatt 1988, p. 679)2) ECE Regulation No. 43, Einheitliche Vorschriften fr die Genehmigung des Sicherheitsglases und der Verglasungswerkstoffe (Standard requirements for the approval of safety glazing and glazing materials) CEC Specification RF-08-A
10、-l985*) *) CEC is the Coordinating European Council for the development of performance tests for transportation I) Obtainable from Deutsches Informationszentrum fr technische Regeln (DIT!?) of DIN, D-10772 Berlin. 2, Obtainable from the Verkehrsblatt-Verlag, Hohe Strae 39, D-44139 Dortmund. fuels, l
11、ubricants and other fluids. Continued on pages 2 to 5. Translation by DIN-Sprachendienst. In case of doubt, the German-language original should be consulted as the authoritative text. No pari of this translation may be reproduced without the prior permission of Ref. No. DIN 52289 : 1998-0 V Deutsche
12、s Institut fr Normung e. V., Berlin. buth Verlag GmbH, D-10772 Berlin, hac the exclusive right of sale for German Standards (DIN-Normen). English price group 06 . . Sales No. 0106 12.99 Page 2 DIN 52289 : 1998-09 3 Principle of methods Method A: Specimens which have not been mechanically loaded are
13、immersed in a test fluid and then visually checked for any effects the fluid has had on the surface. Method B: Specimens are subjected to bending while under load and then wetted with a test fluid. While still bent, the specimens are visually checked for any effects the fluid and the load have had o
14、n the specimen surface. 4 Designation The designation of the test methods specified in this standard shall contain the following elements. Condition of specimens: A for specimens which have not been mechanically loaded B for specimens which have been subjected to bending while under load Test fluid:
15、 1 Kerosine (lighting oil) 2 Ethanol 3 Test fuel 4 Soap solution 5 Window cleaning solution 6 Alcohol 7 Reference petrol 8 Reference kerosine (aviation fuel) Designation of a method of testing specimens subjected to bending while under load (B) for their resistance to soap solution (4): Method DIN 5
16、2289 - B 4 5 Apparatus The following equipment shall be used. 5.1 Method A a) Containers, of various sizes, of materials that are inert to the test fluid used. b) Tweezers of a stainless metal. c) Cotton cloths, filter paper, or cotton pads. 5.2 Method B a) Apparatus for bending specimens, with load
17、ing arrangement as shown in figure 1. The edge of the support shall have radius of curvature of 2,5 mm. b) Soft brush, about 13 mm wide. c) Cotton cloths, filter paper, or cotton pads. +5 -I - - 10211 , - 51+1 1-10211 6 I ri a n 1; I IF Clamp Support Specimen in u nioaded tond i tio n Figure 1: Arra
18、ngement for loading specimen Page 3 DIN 52289 : 1998-09 6 Test fluids 6.1 General The test fluids listed below shall be selected on the basis of the relevant technical delivery conditions or legal regulations (cf. Explanatory notes). All relevant safety regulations (e.g. the Gefahrstoffverordnung) s
19、hall be observed when handling these fluids. 6.2 Kerosine (for lighting) 6.3 96% (V/V) ethanol, C,H,OH. 6.4 CEC reference fuel, as in CEC Specification RF-08-A-1985, with benzene making up no more than 2 % (VIV). 3) 6.5 1 YO soap solution, prepared by dissolving 1 % (rn/rn) potassium oleate in deion
20、ized water. 6.6 Window cleaner solution, prepared by mixing 1 % to 5 % (rn/rn) ammonia solution and making up with 5 YO to 1 O YO (rn/rn) each of isopropanol and dipropylene glycol methyl ether in water. 6.7 Alcohol, denatured, prepared by mixing one part by volume of methanol and 1 O parts by volum
21、e of ethanol. 6.8 Reference petrol, prepared by mixing 50 % (V/V) of toluene, 30 % (V/V) of 2,2,4-trimethylpentane, 15 YO (V/V) of 2,2,4-trimethyl-l -pentene, and 5 YO (V/V) of ethanol. 6.9 Reference kerosine (aviation fuel), prepared by mixing 50 % (V/V) each of octane and decane. 7 Specimens 7.1 S
22、ampling Specimens may be prepared by moulding or machining and may either be taken from semi-finished products or finished products. 7.2 Dimensions For method B, specimens shall be flat, have a length of (180;) mm and a width of (25 12) mm. Specimens shall be deemed to be flat when their radius of c
23、urvature is greaterthan 1 m. All specimens shall have a6 mm diameter hole whose centre lies on the specimens centre axis 163 mm from one of the ends. Unless otherwise agreed, such specimens should also be used for method A. NOTE: The specimens used for method A may be shorterthan those specified abo
24、ve, although their length shall be at least 50 mm. 7.3 Number of specimens Unless otherwise specified, at least two specimens are required for each test fluid. 7.4 Condition of specimens The cut edges of specimens of plastics and of plastics-glazing shall be smooth and shall not have any traces of b
25、urns produced during processing. The cut faces of coated specimens shall be protected from the test fluids (e.g. by taping over or varnishing them). 7.5 Specimen conditioning Before the test, condition specimens for at least 48 hours in DIN 50014-23/50-2 standard atmosphere. 3, For sources of supply
26、, contact the Normenausschu Materialprfung of DIN, D-10772 Berlin. Page 4 DIN 52289 : 1998-09 8 Procedure 8.1 Test temperature The test temperature shall be (23 12) “C. 8.2 Testing unloaded specimens (method A) Use the tweezers to immerse each specimen in the test fluid. Plastic specimens shall be i
27、mmersed to only half their length, while all other specimens are to be fully immersed. Remove the specimens after (60 15) seconds and wipe them off with filter paper, a lint-free cloth or cotton pads. Finally, the specimen shall be checked for the surface changes listed in clause 9. 8.3 Testing spec
28、imens subjected to bending (method B) Specimens shall be clamped in the loading apparatus on one side so that they are supported along their entire width (cf. figure 1). On its free end and 102 mm from the support, load the specimen with a test force, F, in N, which shall be calculated using equatio
29、n (l), unless otherwise agreed. where b is the specimen width, in mm; s is the specimen thickness (given to at least one decimal place), in mm. On the upper surface of the specimen and at a point directly above the edge of the support, brush the specimen with the test fluid (maintained at (23 12) “C
30、) ten times, with an interval of one second between each wipe; wet the brush before each wipe. (60 15) seconds after the last brushing, wipe off the specimen with filter paper, a lint-free cloth or a cotton pad. Still applying the load, immediately check the specimen for the surface changes listed i
31、n clause 9. In the case of anisotropic specimens, testing shall be in the most sensitive direction. For specimens with different surfaces, both surfaces shall be tested. 9 Evaluation Visually compare specimen surfaces with untreated specimens or with the portion of the test specimen that has not bee
32、n exposed to the test fluid. Examine the surface for the following effects, disregarding any changes resulting from the cut faces: a) change in colour (include type of change, e.g. even or uneven); b) change in transparency; c) change in appearance (glossy or frosted); d) crazing (micro-cracks) or d
33、iscontinuities; e) bubbles, blisters, etc.; f) stickiness of the surface; g) delamination, change in form; h) partial dissolution. 10 Test report The test report shall refer to this standard and include the following information: type of glazing tested (designation, design, if necessary); method of
34、manufacturing specimen or sampling method; specimen dimensions, if other than 180 mm x 25 mm; appearance of specimens; number of specimens; test method used; test fluid(s) used; test force used (method B only); any changes to the surface observed. Page 5 DIN 52289 : 1998-09 Explanatory notes Plastic
35、s used as safety glazing in road vehicles can come into short-term contact with cleaning fluids, solvents and motor fuels. A fluid can produce several effects on a plastic, including the leaching of any components of the plastic that are soluble in that fluid, or a chemical reaction that normally al
36、ters the properties of the plastic considerably. Since glazing for road vehicles is installed under both high and low stress, it must be tested in both conditions. For this reason, two methods have been specified in this standard, one on unloaded specimens and one on specimens subjected to bending w
37、hile loaded. Comparisons between different plastics on the basis of the results of these tests are only permitted when the dimensions (especially the thickness) are similar and the physical condition of both plastics (appearance, residual stress, etc.) are nearly alike. When the test fluids specifie
38、d in clause 6 are used, methods A and B as specified in this standard meet the conditions for testing the resistance of rigid and soft plastics to chemicals as given in subclauses 3.6.8.5.1 and 3.7.8.5.1 of No. 29 of the Technische Anforderungen an Fahrzeugteile beider Bauartprfung nach 9 22a StVZO.
39、 Testing with the fluids specified in subclauses 6.5 to 6.9 of this standard using method A meets the conditions for testing the chemical resistance of glass-plastics safety glazing materials (with the plastics surface facing outwards when installed) and of plastics-coated safety glazing specified i
40、n the third revision of ECE Regulation No. 43. However, this regulation does not specify tolerances for specimen dimensions and the immersion time. Method B is similar to the method specified in DIN EN 21 55-19 for determining craze resistance of transparent materials used as glazing in the aerospac
41、e industry. In the case of homogeneous and isotropic materials, results of testing as in subclause 8.3 of this standard can be compared to other chemical resistance or crazing test results when the test force, F, in equation (1) is used to determine an outer fibre stress value. The maximum stress of
42、 outer fibres coming into contact with chemicals will be 6,9 MPa, assuming that the chemicals used do not excessively lower the elastic modulus of the fibres (as a result of swelling), and that the deflection effected by force F does not exceed 1 O mm. If crazing occurs during testing as in this sta
43、ndard, then the maximum flexural stress resisted by the material can be derived from the following equation: where a is the distance, in mm, between the loading point and the furthest craze. This parameter can be used as an additional criterion when assessing the specimens susceptibility to crazing, supplementing the informa- tion gained from test results as in subclause 8.3.
