1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2007 SAE International All rights reserved. No part of this publication m
3、ay be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA)
4、 Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org J2081 REV. MAY2007 SURFACE VEHICLE RECOMMENDED PRACTICE Issued 1991-06 Revised 2007-05 Superseding J2081 AUG1997 Test Procedure for Determining the Resistance of Safety-Glazing Materials, of which One Surface is Plas
5、tic, to Simulated Weathering RATIONALE Modifications to the Recommended Practice are made for purposes of clarification and format. 1. SCOPE This SAE Recommended Practice determines whether plastic and glass-plastic safety glazing materials will successfully withstand exposure to simulated weatherin
6、g conditions. 2. REFERENCES 2.1 Applicable Publications The following publications form a part of the specification to the extent specified herein. Unless otherwise indicated the latest revision of SAE publications shall apply. 2.1.1 ANSI Publication Available from ANSI, 25 West 43rd Street, New Yor
7、k, NY 10036-8002, Tel: 212-642-4900, www.ansi.org. ANSI Z26.1-1996 Glazing Materials for Glazing Motor Vehicles and Motor Vehicle Equipment Operating on Land Highways, Safety Standard 2.1.2 ISO Publications Available from ANSI, 25 West 43rd Street, New York, NY 10036-8002, Tel: 212-642-4900, www.ans
8、i.org. ISO 3537-93 Road vehiclesSafety glazing materialsTest methods for mechanical properties ISO 3538-78 Road vehiclesSafety glazing materialsTest methods for optical properties ISO 3917-92 Road vehiclesSafety glazing materialsTest methods for resistance to radiation, high temperature, humidity, f
9、ire, and simulated weathering ISO 4892 PlasticsMethods of exposure to laboratory light sourcesPart 1: General guidance ISO 4892-2 PlasticsMethods of exposure to laboratory light sourcesPart 2: Xenon-arc sources SAE J2081 Revised MAY2007 - 2 - 2.1.3 CIE Publication Available from Commission Internati
10、onale de lEclairage, CIE Central Bureau, Kegelgasse 27, A-1030 Wien, Austria, Tel: +43-1-714-31-87-0, www.cie.co.at. CIE Publication No. 15.2 (1986) Colorimetry 3. EXPOSURE APPARATUS The light source included in this document is the long-arc xenon lamp. 3.1 Long-Arc Xenon Lamp The exposure apparatus
11、1shall utilize a long-arc xenon lamp as the source of irradiation, which shall comply with ISO 4892, Part 2.2, Section 4 (artificial weathering). The long-arc xenon lamp is advantageous in that it can, when correctly filtered and maintained, yield a spectrum most closely approximating that of natura
12、l sunlight. To this end, the quartz xenon burner tube, shall be fitted with suitable borosilicate glass optical filter(s)2. The xenon lamps employed shall be operated from a suitable 50 or 60 Hz power supply through suitable reactance transformers and electrical equipment. The UV radiation distribut
13、ion shall be as specified in ISO 48922.2, Section 4.1.2, Table 1, Relative spectral irradiance for artificial weathering (Method A). The exposure apparatus shall include equipment necessary for measuring and/or controlling the following: a. Irradiance b. Black panel temperature c. Water spray d. Ope
14、rating schedule or cycle The exposure apparatus shall be made from inert materials which do not contaminate the water employed in the test. Irradiance shall be measured at the test specimen surface and shall be controlled according to the recommendations of the manufacturer. Total ultraviolet3radian
15、t exposure (Joules per square meter) shall be measured or computed and shall be considered the primary measure of test specimen exposure. 4. TEST SPECIMENS The dimensions of the test specimen shall normally be those specified in the appropriate test method for the property or properties to be measur
16、ed after exposure. The number of test specimens for each test condition or exposure stage shall be determined, in addition to those required for visual evaluations as referenced in Section 6 of this document, by the number required by the test methods. It is recommended that visual evaluations be co
17、nducted on the largest test specimens tested. 1Such as Atlas Ci, XenotestSeries, or equivalent. 2Such as Corning 7740, Atlas Type S, Atlas Suprax, or equivalent. 3Total ultraviolet is considered to be all radiation of wavelength less than 400 nm. SAE J2081 Revised MAY2007 - 3 - 5. PROCEDURE Measure
18、according to ANSI Z26.1 (1996) or ISO 3538, the luminous transmission of the test specimen(s) to be exposed. (It is not necessary to condition specimens prior to exposure in this test, as the test itself includes special conditions.) Measure, according to ANSI Z26.1 (1996) or ISO 3537, the resistanc
19、e to abrasion of the plastic surface(s) (whether coated or uncoated) of the control specimen(s). The face of each test specimen, which would represent the exterior surface when mounted on a road vehicle, shall face the lamp. Other exposure conditions shall be as follows: 5.1 In accordance with ISO 4
20、892, the irradiance shall not vary more than 10% over the whole test specimen area. 5.2 At appropriate intervals, clean lamp filters by washing with detergent and water. Xenon-arc filters shall be replaced according to the recommendations of the equipment manufacturer. 5.3 The temperature within the
21、 exposure apparatus during the dry portion of the cycle shall be controlled by circulation of sufficient air to maintain a constant black standard temperature. This temperature shall be 70 C 3 C as indicated by a Black Standard Thermometer4or equivalent. 5.4 The thermometer is preferably mounted on
22、a support for a test panel in such a way that it receives the same radiation and cooling conditions as a flat test panel surface on the same support. It may also be located at a fixed distance position different from the specimen distance and calibrated for temperature at the specimen distance. 5.5
23、The relative humidity within the exposure apparatus shall be controlled at 50% 5% during the dry portions of the cycle. 5.6 The deionized water used in the spray cycle shall contain less than 1 ppm silicon dioxide solids and shall leave no permanent deposit or residue on the test specimens which wou
24、ld interfere with subsequent measurements. 5.7 The pH of the water shall be between 6.0 and 8.0, and the conductivity shall be less than 5 microsiemens. 5.8 The temperature of the water in the line where it enters the exposure apparatus shall be at the ambient water temperature. 5.9 The water shall
25、strike the test specimens in the form of a fine spray in sufficient volume to wet the test specimens uniformly, immediately upon impact. Water spray will be directed only against the test specimen surface facing the light source. No recirculation of the spray water or immersion of the test specimens
26、 in the water shall be permitted. 5.10 The test specimens shall be rotated about the arc in order to provide uniform distribution of the light. All positions in the exposure apparatus shall be filled with test specimens or surrogates to ensure that a uniform temperature distribution is maintained. T
27、est specimens shall be held in frames with backs exposed to the cabinet environment. However, reflections from cabinet walls shall not be permitted to strike the back surface of specimens. If necessary, samples may be backed to block such reflections; the backing must not be in direct contact with t
28、he specimen and must not impede the free circulation of air at the specimen surface. 5.11 The exposure apparatus shall be operated to provide continuous light and intermittent water spray in 2 hour cycles. Each 2 hour cycle, in accordance with ISO 4892, shall be divided into periods during which the
29、 test specimens are exposed to light without water spray for 102 minutes and to light with water spray for 18 minutes. 4The Black Standard Thermometer (BST) is defined by ISO 4892, Part 1, Section 4.1.5. SAE J2081 Revised MAY2007 - 4 - 6. EVALUATION After exposure, the test specimens may be cleaned,
30、 if necessary, by a practice recommended by their manufacturer to remove any residues present. The irradiated specimens shall be conditioned prior to testing for a minimum time of 48 hours at 22 C to 24 C and 50% 2% relative humidity. Evaluate the exposed test specimens visually with respect to the
31、following properties: a. Bubbles b. Color5c. Haze d. Noticeable decomposition Measure, according to ANSI Z26.1 (1996) or ISO 3537 and ISO 3538, respectively, the luminous transmission and the resistance to abrasion on both sides of the exposed specimen. 7. EXPRESSION OF RESULTS Report visual evaluat
32、ions of exposed test specimens, comparing the appearance of each with that of the unexposed control specimens. If color is measured instrumentally, compute and report the color change. Report the change in luminous transmittance and the changes in resistance to abrasion, comparing results of tests o
33、n exposed test specimens with results of tests on unexposed control specimens. Note whether the side tested was facing toward or away from the xenon lamp. 8. REPORT OF TEST PARAMETERS Report the following: a. Exposure apparatus (manufacturer, model) b. Exposure time, hours c. Total ultraviolet radia
34、nt exposure, Joules per square meter d. Black panel temperature and chamber temperature maintained during irradiation 9. NOTES 9.1 Marginal Indicia The change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions have been made to the previous issue of the report. An (R) symbol to the left of the document title indicates a complete revision of the report. PREPARED BY THE SAE GLAZING MATERIALS STANDARDS COMMITTEE 5Color change may be evaluated optionally by the method described in CIE publication No. 15.2 (1986), Colorimetry.
