Tint film shall be tested according to the following tests:
The solar performance test shall include Visible Light Transmittance (VLT), Ultra-Violet Transmittance (UVT) and Total Solar Energy Transmittance.
The testing shall be conducted based on 3.2, 3.3, 3.5 and 3.6 of ISO 9050. The test instrument shall be able to cover the measuring from the range of 300 nm to 2500 nm inclusive.
Table 1 describes the type of tests to be conducted with respective measurement ranges, sample specification and requirements.
|Type of testing||Measurement range (nm)||Sample dimension||Quantity||Requirements|
|Total solar energy transmittance (TSET)(solar factor)||Class 1||300 - 2500||50 mm x 50mm||3 pieces||≤ 0.50|
|Class 2||0.51 - 0.61|
|Class 3||0.62 - 0.75|
|Ultraviolet transmittance(UVT)||Class A||300 - 380||≤ 0.5 %|
|Class B||0.51 % - 1.5 %|
|Class C||1.6 % - 2 %|
|Visible light transmittance(VLT)||380 - 780||Refer to 4.2.1|
|NOTE. Tolerance for ultraviolet transmittance and total solar energy transmittance are not specified as the application is within laboratory setting in which the error is kept at a minimum level.|
|Samples Size||50 mm x 50mm tint film only (x3pcs)|
|Measurements/ Procedure||VLT, UV and TSET|
The following equation is to calculated the requirement of visible light transmittance (VLT) for tint film:
VLTf is representing the value of visible light transmittance for tint film;
VLTc is representing the value of visible light transmittance for the combination of glass and tint film according to regulation of Road Transport Act, 1987; and
VLTg is representing the value of visible light transmittance for glass.
NOTE: Based on the validation study which adopt various combination of glass and tint film at the material time shows that by applying tint film on to the glass, it would produce higher VLTc value than the estimated VLTc calculated from the equation which can be considered as minimum value.
The VLTf calculation shall consider the minimum VLTg requirement of windscreen, front and side windows and other windows according to the regulation in the UN Regulation No. 43 (UNR 43)
The requirement shall premeditate a possibility tolerance up to -10%
The sum of the solar direct transmittance and the secondary heat transfer factor towards the inside, the latter resulting from heat transfer by convection and long wave Infrared (IR)-radiation of that part of the incident solar radiation (spectral range from 300 nm to 2500 nm) which has been absorbed by the glazing. It is almost the opposite of Total Solar Energy Rejection, TSERUltraviolet Transmittance
The fraction of the incident solar radiation transmitted by the glazing in the 300 nm to 380 nm range (UV-B range from 300 nm to 315 nm and UV-A range from 315 nm to 380 nm).Visible Light Transmittance
The percentage of Visible light transmitted by the glazing in the 380 nm to 780 nm range.
The purpose of this test is to assess the performance of tint film applied on glass exposed under specified accelerated condition.
For physical observation, there shall be no obvious colour changes when comparing exposed sample and control sample.
As for the visible light transmittance, the difference between before and after exposure shall not be more than 4 % and Total Solar Energy Transmittance shall not more than 8%.
|Samples Size||100 mm x 50 mm Tint film with Glass (x 4pcs)|
|Measurements/ Procedure||VLT Measurement → 1000 hours→ VLT Measurement|
The purpose of this test is to determine whether the tint film applied on glass will withstand exposure to high temperatures over an extended period of time without its appearance becoming substantially altered.
The resistance of the tint film to high temperature shall be evaluated with reference to any bubble or other defects produced (i.e. delamination and discoloration) in the test sample after the above test. All samples shall comply with the test requirement.
|Samples Size||300 mm x 300 mm (at least 6mm thickness)Tint film with Glass (x 3pcs) – Tempered Glass|
|Measurements/ Procedure||2 hours of boil test up to 100C|