GB/T 38586-2020 English PDF (GBT38586-2020)

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GB/T 38586-2020: Vacuum insulating glass
GB/T 38586-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 81.040.20
Q 33
Vacuum Insulating Glass
真空玻璃
ISSUED ON: MARCH 31, 2020
IMPLEMENTED ON: FEBRUARY 1, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Terms and Definitions ... 4 
4 Requirements ... 5 
5 Test Methods ... 8 
6 Inspection Rules ... 13 
7 Packaging, Marking, Transportation and Storage ... 15 
Appendix A (informative) Introduction of Vacuum Insulating Glass ... 17 
Appendix B (normative) U Value Measurement by Heat Meter Flow Method 20 
Vacuum Insulating Glass
1 Scope
This Standard stipulates the requirements, test methods, inspection rules, packaging,
marking, transportation and storage of vacuum insulating glass.
This Standard is applicable to vacuum insulating glass for construction and home
appliances. Vacuum insulating glass for other purposes may take this as a reference.
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 1216 External Micrometer
GB/T 8170 Rules of Rounding-off for Numerical Values and Expression and Judgement
of Limiting Values
GB/T 8484 Graduation and Test Method for Thermal Insulating Properties of Doors
and Windows
GB/T 10295 Thermal Insulation - Determination of Steady-state Thermal Resistance
and Related Properties - Heat Flow Meter Apparatus
GB/T 19889.3 Acoustics - Measurement of Sound Insulation in Buildings and of
Building Elements - Part 3: Laboratory Measurements of Airborne Sound Insulation of
Building Elements
GB/T 22476 Calculation and Determination of Steady-state U Values (thermal
transmittance) of Multiple Glazing
GB/T 22523 Feeler Gauge
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Vacuum Insulating Glass
Vacuum insulating glass refers to a glass product, in which, two or more pieces of glass
5.4.1 Thermal Transmittance (U value) -- heat flow meter method
The sample is flat vacuum insulating glass manufactured with the same materials, the
same structure and the same process conditions as the product. Sample size shall be
not less than 300 mm  300 mm.
In accordance with the method in Appendix B, measure thermal transmittance.
5.4.2 Thermal Transmittance (K value) -- calibration hot-box method
Take the product as a sample; measure in accordance with GB/T 8484.
5.5 Sound Insulation Properties
The sample is the product, or, 1,000 mm  1,000 mm flat vacuum insulating glass
manufactured with the same materials, the same thickness and the same process
conditions as the product.
In accordance with GB/T 19889.3, measure the sound insulation properties of the
sample.
5.6 Durability Test
5.6.1 Sample
The sample is flat vacuum insulating glass manufactured with the same materials, the
same structure and the same process conditions as the product. Sample size shall be
not less than 300 mm  300 mm.
5.6.2 Test equipment
Test chambers of the following three test stages shall be provided. The test chambers
shall satisfy the following conditions:
Stage 1: UV resistance test. The light source is ultraviolet lamp, with a power of 300
W and an irradiation intensity of ≥ 40 W/m2 within the wavelength range of 315 nm ~
380 nm. The temperature in the test chamber is controlled at 50 °C ± 3 °C. When the
irradiation intensity cannot be reached, the ultraviolet lamp shall be replaced.
Stage 2: high and low temperature cycle test. Controllable temperature range: (-18 °C
± 2 °C) ~ (53 °C ± 1 °C); controllable temperature rising and falling rate: 14 °C/h ±
2 °C/h.
Stage 3: constant temperature and humidity test. Controllable temperature: 58 °C ±
1 °C; relative humidity: > 95%.
The temperature curve is shown in Figure 4.
conditions that the temperature is 58 °C ± 1 °C and the relative humidity is more than
95%, maintain for 7 weeks. When different test chambers are used, the maximum time
interval of transferring the samples from Stage 2 test chamber to Stage 3 test chamber
is 4 h.
5.6.3.5 Move the samples out of the constant temperature and humidity test chamber.
In accordance with 5.4.1, measure the thermal transmittance of the vacuum insulating
samples.
5.6.3.6 Respectively calculate the thermal transmittance variation (rate) of each
sample; calculate the average value.
6 Inspection Rules
6.1 Inspection Classification
Inspection is classified into exit-factory inspection and type inspection.
6.2 Inspection Items
Exit-factory inspection items are: dimensional deviations, appearance quality and bow
curvature.
Type inspection items are all the inspection items stipulated in Chapter 4.
6.3 Exit-factory Inspection
6.3.1 Group batch
Take 500 pieces of vacuum insulating glass continuously manufactured with the same
materials and under the same process conditions as one batch. When the quantity is
less than 500 pieces, they shall still be counted as one batch.
6.3.2 Sampling
The dimensional deviations, appearance quality and bow curvature shall be inspected
through random sampling from the delivery batch in accordance with Table 7.
f) When quality supervision department proposes a request for type inspection.
6.4.2 Group batch
Take 500 pieces of vacuum insulating glass continuously manufactured with the same
materials and under the same process conditions as one batch. When the quantity is
less than 500 pieces, they shall still be counted as one batch.
6.4.3 Sampling
When the dimensional deviations, appearance quality and bow curvature are inspected,
the sampling size is shown in Table 7.
6.4.4 Determination rules
6.4.4.1 When dimensional deviations, appearance quality and bow curvature are
inspected, if the number of disqualified is less than, or, equals to the Number of
Conformity Determination in Table 7, then, this batch shall be determined as qualified
in this item. If the number of disqualified is more than, or, equals to the Number of
Nonconformity Determination in Table 7, then, this batch of products shall be
determined as disqualified in this item.
6.4.4.2 When the thermal insulation properties are inspected, take 1 piece of sample
for the inspection. When the U value or K value satisfies Level-II or Level-I
requirements in Table 5, then, it shall be determined as qualified in this item.
6.4.4.3 When the sound insulation properties are inspection, take 1 piece of sample
for the inspection. When it satisfies the requirements, it shall be determined as qualified
in this item.
6.4.4.4 When the durability test is conducted, take 3 samples for the inspection. When
all the samples satisfy the requirements, they shall be determined as qualified in this
item, otherwise, disqualified.
6.4.4.5 Among all the inspection items, if one inspection item is disqualified, then, this
batch of products shall be determined as disqualified.
7 Packaging, Marking, Transportation and Storage
7.1 Packaging
Products shall be packed in containers or wooden boxes. Spacing materials that would
not easily scratch the g...