Group Standard
PV 3930
2008-03
Class. No.: 55126
Descriptors:
Florida, Florida test, weathering, weather resistance, climate
Check standard for current issue prior to usage.
Page 1 of 5
The English translation is believed to be accurate. In ca of discrepancies the German version shall govern. Numerical notation acc. to ISO practice.
This electronically generated standard is authentic and valid without signature.
Technical Responsibility
Standards
GQL-LP/3 Sabine Kamieth-Müller Tel.: +49-5361-9-30173 GQL-LP
Dr. Roger Hillert
EKTC/4 Ute Hager-Süss
Tel.: +49-5361-9-49035
EKTC
Manfred Terlinden
Confidential. All rights rerved. No part of this document may be transmitted or reproduced without the prior permission of a Standards department within the Volkswagen Group.
Contract partners shall obtain the standard only through the B2B supplier platform
© VOLKSWAGEN AG vwnorm-2007-07
Non-Metallic Materials
Weathering in Moist, Hot Climate
Previous issues
PV 3930: 1993-11, 1994-08, 2003-11
Changes
The following changes have been made as compared to Test Specification PV 3930: 2003-11: ─ Two test devices removed, two added 1
Scope
This standard describes the procedure for testing the aging behavior (e.g., change in color and gloss) of plastics, elastomers and folding-top cloths as well as paintwork and similar coatings that are subjected to weather and daylight. Testing is carried out by means of artificial weathering in a moist hot climate (e.g., Florida).
The test is ud for sample and standard production monitoring.
NOTE: For certain applications, the aging criteria may consist of changes in the mechanical proper-ties or cracking. For this reason, additional tests may be required along with the visual evaluation and color and glossiness measurements. The tests may include tensile tests, determination of impact resistance, determination of hardness and microscopic examinations, for example. 2
Description
Weather resistance according to PV 3930
Q U E L L E : N O L I S
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3 Requirements
The number of required year cycles, as well as deviations from this test standard, are t out in the Technical Supply Specifications, Volkswagen standards and drawings depending on the compo-nent position or material.
4 Test Method
4.1 Principle
Specimens shall be irradiated using Xenon arc light and periodically moistened. Filters shall be ud to adapt the Xenon arc light to the global radiation with its spectral distribution of ultraviolet and visible radiation.
Testing shall be performed in devices according to DIN EN ISO 4892-2 and DIN EN ISO 11341. The test conditions each describe a year cycle, referred to the average do of UV radiation of (300 to 385) nm in moist, hot climate zones, e.g., Florida.
4.2 Test equipment
Equipment according to DIN EN ISO 4892-2 and DIN EN ISO 11341 shall be ud. To ensure that the test results of the suppliers and purchar are comparable, the make to be ud for the test must be agreed with the responsible laboratory of the Volkswagen Group.
4.3 Weathering conditionsoption
See Table 1. To comply with the test temperatures and, in particular, the black standard tempera-tures, it may be necessary to keep the laboratory space at a constant temperature or to connect a cooling unit to the test equipment.
Table 1
Make Xenotest 1200 CPS Xenotest alpha
Xenotest beta LM Weather-O-Meter
Ci 3000
Ci 4000
Ci 5000
Suntest XXL+ Q-Panel
Filter 3 UV-Spezial Suprax
Replace according to
manufacturer's
specifications Xenochrom 300
Replace according to
manufacturer's
specifications
Pyrex S/Pyrex S
泰国达人秀
Replace according to
manufacturer's
specifications
Coated quartz filter
and 300 nm daylight
filter
Coated quartz filter
and 300 nm daylight
filter
Rain cycle 102 : 18
Specimen rotation Non-turning mode Flatbed equipment Black standard
酬金workontemperature (°C) 65 ± 2
Specimen chamber
temperature
in the dry pha (°C) 35 to 45
Relative humidity in the
dry pha (%) 60 to 80
Intensity of irradiation (W/m²)
(nm)(Controlled)
60
300 to 400
(Controlled)
0,5
340
300 to 400
Test duration
araby
(approximate value) (h) Approx. 1 600
Irradiation do
(1 year cycle)
(MJ/m²) 350 2,9 350
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4.4 Specimen
4.4.1 Specimen preparation
The specimens shall be taken from a reprentative portion of the finished part to be tested or of specimen sheets manufactured under standard production conditions. They shall be as flat as pos-sible. As long as the apparatus-dependent specimen carrier size is not exceeded, complete com-ponents may also be tested. However, it is important to ensure that the surface to be tested does not project more than 10 mm over the specimen carrier plane. The specimen shall be cured on the specimen carrier. One half of the specimen's surface shall be covered with a sheet metal mask. In or
der to test the change in mechanical properties, e.g., by means of tensile tests and determina-tion of the impact resistance, the specimens shall be made in a size that is required for the respec-tive test procedure or that is prescribed in standards.
Paintwork and similar coatings shall be tested always on the substrate to be ud.
For the test of paint materials, sample coatings shall be produced under standard production condi-tions (application method, drying method, and coating thickness).
4.4.2 Specimen size
The specimen size shall be in accordance with the maximum clampable test surfaces in the original specimen carriers. Thus, the following would apply:
─Xenotest 1200 CPS (175 x 60) mm
─Xenotest alpha (130 x 40) mm
─Weather-O-meter Ci 3000 (130 x 45) mm
─Weather-O-Meter Ci 4000 and Ci 5000 (1 450 x 70) mm
─Suntest XXL+ (135 x 45) mm
─Q-Panel (135 x 45) mm
The lected specimen size shall be sufficiently large to ensure that proper evaluation can be per-formed with the designated procedures.
4.4.3 Specimen carriers
Only for Xenotest 1200 CPS: Bent non-turning carriers shall be ud in order to achieve an even intensity of irradiation over all three specimen carrier planes.
For the Suntest XXL+ and Q-Panel Xenotest equipment types, it shall be ensured that the speci-men frames are rotated clockwi every 200 h in order to achieve uniform weathering of the specimens.bailout
4.5 Weathering test
4.5.1 Cleaning the filters
The filter systems shall be checked and cleaned at regular intervals.
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4.5.2 Replacing the irradiator
The maximum operating time of the irradiator for non-adjustable equipment types is 1 500 h. How-ever, the operating time for adjustable equipment types may be extended up to the control limit. 4.5.3 Spray water
tomato怎么读To avoid deposits on the specimen, which can complicate the evaluation, distilled or deionized, silicate-free water with a conductance of ≤ 0,2 µS and an evaporation residue of < 1 ppm shall be ud.
4.5.4 Weathering cycle
The end of a weathering cycle is reached for a specified intensity of UV irradiation and radiation do after a specific test duration (approximate value; e Table 1). To ensure even intensity of irradiation, this shall be checked weekly with the Xenocal made by Atlas. In the Q-Panel equip-ment, this is checked with appropriate nsors.
4.6 Evaluating the specimens
4.6.1 Visual evaluation
Changes in color and gloss shall be compared against the previously covered surface or an unex-pod reference specimen with the gray scale to evaluate the “change in color” according to DIN EN 20105-A02 under lighting according to DIN EN ISO 105-A01 or indirect daylight by veral proficient normal-sighted people (at least two).
Changes that need not be evaluated by means of measurements are described according to DIN 53230.
4.6.2 Colorimetric evaluation
In addition to the visual evaluation, a colorimetric evaluation using a spectrophotometer according to CIELAB (DIN 6174), excluding the gloss value, shall be conducted according to a procedure specified in VW 50195.
If required, the result shall be converted to gray-scale levels according to DIN EN 20105-A02, and for yellowing to yellow values according to DIN 6167.
In the ca of painted specimens, it is preferable to perform a colorimetric evaluation.
For single-color and homogenous surfaces, at least three measurements shall be averaged. For multicolored, structured or anisotropically scattering specimens, the number of measurements to be averaged shall be incread.万圣节的英文单词
4.6.3 Evaluation of gloss
Gloss shall be measured as a reflectometer value according to DIN 67530, and the change after weathering is expresd in %.
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4.7 Test report
If required in the corresponding Technical Supply Specification/Volkswagen standard/drawing, the following information shall be specified in the test report with reference to this test standard:
a) Test equipment
b) Total test duration
c) Color change: gray-scale level/dE/dL/da/db
d) Any color shift
e) Yellow value according to DIN 6167
f) Change in gloss
g) Further tested properties and test methods of the appropriate test standard
h) Additional obrvations and changes such as cracks, spotting, exudations, chalking, etc.
i) Any agreed upon conditions that deviate from this Test Specification.
5 Referenced documents
The following documents cited in this standard are necessary for application.
In this Section, terminological inconsistencies may occur as the original titles are ud.
VW 50195 Colorimetric Evaluation of Automobile Paint Coatings
DIN 6167 Description of Yellowness of Near-White or Near-Colourless Materials
DIN 6174 Colorimetric Evaluation of Colour Coordinates and Colour Differences ac-cording to the Approximately Uniform CIELAB Colour Space
DIN 53230 Testing of Paints, Varnishes and Similar Coating Materials, Scheme for the Evaluation of Tests
DIN 67530 Reflectometer as a Means for Gloss Asssment of Plane Surfaces of Paint Coatings and Plastics
DIN EN 20105-A02 Textiles – Tests for Colour Fastness – Part A02: Grey Scale for Asssing Change in Colour
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DIN EN ISO 105-A01 Textiles – Tests for Colour Fastness – Part A01: General Principles of Test-ing
DIN EN ISO 4892-2 Plastics – Methods of Exposure to Laboratory Light Sources – Part 2: Xe-non-Arc Lamps
DIN EN ISO 11341 Paints and Varnishes – Artificial Weathering and Exposure to Artificial Ra-diation – Exposure to Filtered Xenon-Arc Radiation圣诞节快乐英文怎么说
