1. Scope of Application

This standard stipulate durability testing methods under high temperature, humidity and radiation environment for laminated glass and laminated safety glass used in construction.

2. Normative references

TCVN 7219: 2002 plate glass in construction - Testing methods.

3. Sample

The sample must represent the product lot. The sample may be the original glass produced  with the sample size or cut from large plate glass. Samples were cut from large sheet glass must have at least one side edge of the plate.

If the edges of the product is ground to protect, the edges of the samples were treated too.

The sample bearer do not cover both sides of the sample. If it is cut from a large glass panel, at least one edge of the plate remains uncovered.

Before conducting tests, checking samples at a distance from 30 cm to 50 cm on a white background. Only samples without defects (bubbles, blistering, cracks, etc) are used as samples.

4. High-temperature test

4.1. Principles

The purpose of this test is to determine high temperature resistant of the glass in a certain period of time without changing the properties of laminated glass and laminated  safety glass The quality changing is assessed through the bubbles, blistering, cracks, spots (not run).

4.2. The size and number of sample

Using three samples with the size not less than 300 mm x 100 mm.

4.3. Process

Three samples heated at 100-30 0 C. Keep the temperature within 2 hours, then samples cooled at room temperature.

If both outside of the samples are glass, conducting sample submerged vertical immersion in boiling water to 100-30 0 C.

To avoid the temperature difference leading to cracked, broken form, raising the temperature to 2 steps. Initially raise the temperature to 600C and keep at this temperature for 5 minutes.

4.4. Showing results

Test samples from a distance of 30 cm to 50 cm on white background.

Record the number and size of defects occur in the interlayer (bubbles, blistering, cracks, still, not wearing) on ​​each sample, excluding the errors in the area away the  original edges  15 mm and cutting edge 25 mm (to allow the foam around the core fiber).

Remove fractured samples and conduct experiments on new models.

The blistering is considered as criteria for the temperature resistant and moisture resistant test and considered as a disability two dimensions, the surface between the glass and the interlayer, in which the no adhesion.

4.5. Test Report

Test report must include the following information:

a) The type and texture of the laminated glass or laminated safety glass with a nominal thickness of each layer, measured in millimeters;

b) Type of samples, including samples cut or original form; type of edge, edge protection, the size;

c) Type of edges are supported and not supported on the frame ;

d) The number and size of the defect cavity, blistering and spot (not run) appear on each form.

5. Testing moisture environment

5.1. Principles

The purpose of this test is to determine resistance of laminated glass or laminated safety glass under the influence of humid environment in a period that the properties does not change. The effect of moisture was assessed by the disability bubbles, blistering and  spot (not run).

5.2. The size and number of samples

Prepare three sample with size not less than 300 mm x 100 mm.

5.3. How to proceed

5.3.1. Testing the condensation

Keep three vertical samples in closed containers with water over a period of two weeks. Keep the air temperature in the tank at 50 +2 0 0 C.

Keep the samples at proper distance.

Note: The above conditions create a relative humidity 100% and lead the condensation  on the surface of the sample.

5.3.2. Testing no condensation

Place the three samples in a vertical position in two weeks in a curing chamber and the temperature kept at 50 +2 0 0 C and relative humidity 80% ± 5%. Keep the samples at proper distance.

5.4. Showing results.

Check the sample at a distance of 30 mm and 50 mm on white background.

Record the number and size of defects occur in interlayer the bubbles, blistering, cracks, spot, (not run) on ​​each sample. Ignore the defects within 15 mm to 25 mm from the initial edge to the cutting edge or 10 mm to the crevices.

Allow the foam around the core yarn. In the case of  heat resistant laminated glass or laminated safety galss only assess the heat blistering defects.

Note: interlayer between heat-resistant laminated glass and laminated safety glass is designed to withstand high temperatures. Keeping the samples at room temperature and humidity during a long period of time may form bubbles, cracks, spot in the interlayer without affecting the heat-resistant properties that only the blistering is cared.

5.5. Test Report

Test report must include the following information:

a) The testing process(5.3.1 or 5.3.2);

b) Type and structure of laminated glass or laminated safety glass, with a nominal thickness of each layer, measured in millimeters;

c) Type of sample, is cut or original; type of edge, edge protection, size;

d) Edge is supported or not supported on the test frame;

e) The number and size of bubbles, blistering, stains still appear in each sample (not run). In the case of laminated glass and heat-resistant laminated glass only assess the blisters.

6. Radiation Testing

6.1. Principles

The purpose of this test is to determine the radiation resistance of laminated glass or laminated safety glass in a certain period through a significant change in the nature of the glass. Change the nature of the glass was assessed by changes in light transmission and the emergence of bubbles, blisters and burn marks  (not run).

6.2. How to proceed

6.2.1. Radiation source

Use of radiation sources that can produce similar spectral solar radiation. To obtain the same spectrum allocation can use the bulbs have a combination of glossy high-pressure mercury vapor lamps with incandescent tungsten wire.

To ensure reproducibility and repeatability of the test, using the light wavelengths as follows:

UVB (280 nm to 315 nm) 3% ± 1%

UVA (315 nm to 380 nm) 8% ± 1%

Type can be seen (380 nm to 780 nm) 18% ± 1%

IRA (780 nm to 1400 nm) 24% ± 2%

IRB (1400 nm to 2600 nm) 27% ± 4%

IRC (> 2600 nm) 20% ± 3%

6.2.2. Test Conditions

Radiation Testing time is 2000 hours.

The sample is kept at a temperature of 450C ± 50C.

In the process of trying to replace the bulbs if UVA radiation level in more than 50% reduction.

The total radiation over the entire sample to reach 900 ± 100 W/m2 W/m2.

Note: To determine the total use of radiation and use ISO 9060 sensitivity at least in the wavelength range from 305 nm to 2800 nm. Using the radiation detector to measure radiation levels in the entire sample 730 ± 80 W/m2 W/m2.

6.2.3. Arrangement of test equipment

Samples were mounted vertically direct radiation. Radiation of each bulb to create an optimal density of radiation on the sample surface. The minimum distance between the array of samples and the test room is 400 mm and the space behind the range of at least 500 mm (to get a natural arch upward without interference).

To obtain the radiation fully synchronized, the area covered by the sample does not exceed the range of light area A is determined by the expression:

A = n x L12

In which:

n is the number of lights;

l1 is the distance between the axis of the light side.

Appendix A describes the layout of the test equipment.

6.3. The size and number of samples

Prepare three sample with size not less than 300 mm x 300 mm.

6.4. How to proceed

As required by 6.5, determine the light transmission of the three samples prior to testing according to the TCVN 7219: 2002.

Arrange the samples so that the sample surface facing rows of lights. Laminated layers and asymmetrical design on the outside to try to turn both sides.

After illumination, determine the light transmission of each sample according to the TCVN 7219: 2002.

6.5. Showing results

6.5.1. Laminated glass and laminated safety glass

If the initial light transmission> 20%, then compare the results of measuring the light transmission of each sample with its own values ​​before being tried. Deviation measured in percent.

If the initial light transmission is 20 pounds, then the difference between light transmission and last initial.

Check out the sample at distances from 30 cm to 50 cm on white background.

Record the number and size of the blisters appear in the interlayer between each sample. Ignore the defects within 15 mm to 25 mm from the initial edge to the cutting edge.

6.5.2. Heat resistant laminated glass and laminated safety glass

Check out the sample at distances from 30 cm to 50 cm on white background.

Record the number and size of the blisters appear in the interlayer between each sample. Ignore the defects within 15 mm to 25 mm from the initial edge to the cutting edge.

Note: The interlayer laminated between layers of laminated and heat-resistant layers are designed to react at high temperatures. Samples of the glass when the temperature reaches the test trial of radiation in a long time and can create bubbles in the interlayer between blood thinner without compromising the heat is only interested in the blistering .

6.6. Test Report

Test report include the following information:

a) The type and texture of the laminated glass or laminated safety glass, and the nominal thickness of each layer, measured in millimeters;

b) Type of samples, including samples cut or original form; type of edge, edge protection, size;

c) Technical regulation of radiation sources;

d) If the product is not symmetric, the surface of the products subject to radiation;

e) Products with the original light transmission greater than 20%: the difference in the percentage of light transmission before and after the radiation of each sample;

Products with initial light transmission £ 20%: the difference in light transmission before and after radiation of each sample;

In case of heat resistant laminated glass and laminated safety glass, there is no difference.

f) The number and size of blistering occur each sample.

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