GB/T 32991-2016 in English
VALIDTest method for density uniformity of mineral wool for thermal insulation
- Issued on:2016-10-13
- Implemented on:2017-09-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$88.00
《GB/T 32991-2016矿物棉绝热材料密度均匀性试验方法》由TC191（全国绝热材料标准化技术委员会）归口，主管部门为中国建筑材料联合会。
Introduction
GB/T32991-2016 Standard Overview
This standard specifies the terms and definitions, principles, instruments, specimens, test procedures, result calculation and test report of the density uniformity test method for mineral wool thermal insulation materials. It is applicable to mineral wool thermal insulation products such as glass wool, rock wool, slag wool, aluminum silicate wool, etc.
Background of Standard Formulation
With the increasing demand for building energy conservation, the performance requirements of thermal insulation materials are becoming increasingly stringent. Density uniformity is an important indicator for measuring the quality of mineral wool thermal insulation materials, which directly affects their thermal insulation effect and service life. GB/T32991-2016 is based on basic standards such as GB/T5480 and is formulated in combination with the actual needs of the industry, aiming to provide a scientific basis for the quality inspection of related materials.
Technical Evolution Analysis
The density uniformity test method of mineral wool thermal insulation materials has undergone a technical upgrade from empirical judgment to quantitative analysis. Traditional methods rely on manual visual inspection and empirical judgment, which are highly subjective and result inaccurate. GB/T32991-2016 has achieved standardization and operability of the detection process by introducing quantitative indicators (maximum surface density deviation value and deviation rate).
Comparison of standard frameworks
| Standard dimensions | GB/T32991-2016 | Old version of the standard | Comparison with international standards |
|---|---|---|---|
| Definition of terms | Definition of maximum surface density deviation value, deviation rate and density uniformity | Not systematized | Basically consistent with relevant ISO standards |
| Test method | Use the three-section cutting method to quantify the deviation value and deviation rate | Rely on manual visual inspection | In line with internationally accepted methods |
| Scope of application | Applicable to a variety of mineral wool products | Applicable only to some materials | Meet the universal requirements of ISO standards |
Instruments and operating specifications
According to GB/T32991-2016, the main instruments required for the test include: steel ruler (division value not less than 1mm) and balance (division value not less than 1g). The sample is cut into three equal parts vertically to ensure the accuracy of the measurement results.
Implementation Suggestions
Case Analysis: Practice of a Mineral Wool Products Factory
In order to verify the actual application effect of the standard, a mineral wool products factory tested a batch of rock wool boards in accordance with the requirements of GB/T32991-2016. Nine specimens were obtained by the three-section cutting method, and the surface density of the whole specimen and each specimen was calculated. The results showed that the maximum surface density deviation value was 0.5 kg/m² and the deviation rate was 0.8%, which met the standard requirements.
It is recommended that enterprises conduct quality inspections in accordance with this standard regularly during the production process to ensure the uniformity and consistency of the products. At the same time, it is recommended that relevant departments strengthen the promotion of standards and improve the overall technical level of the industry.
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