The size and allowable deviation testing in the GB T 17794-2021 standard for flexible foam rubber and plastic insulation products aims to ensure that the dimensions of flexible foam rubber and plastic insulation products meet the relevant technical requirements, and specify the allowable deviation range of the product. Dimensional and allowable deviation detection plays an important role in ensuring the accuracy and stability of thermal insulation products in installation and use. The following is a detailed introduction to the size and allowable deviation detection in the GB T 17794-2021 standard
1.Purpose of detection.
The main purpose of the size and allowable deviation test is to ensure that the size of the flexible foam rubber insulation products meets the standard provisions and to standardize the allowable size deviation range. By inspecting the size of the part, it is possible to ensure its fit and reliability in the insulation of building and industrial equipment.
2.Test items.
The size and allowable deviation detection in the GB T 17794-2021 standard mainly includes the following items:
2.1 Dimensions.
Dimensional testing includes measuring the length, width, thickness and other dimensions of flexible foam rubber insulation products to ensure that they meet the requirements specified in the standard.
2.2 Cable density.
Cable density refers to the number of cables per unit length, and the cables in flexible foam rubber insulation products are usually used to enhance the strength of the product. The detection of cable density helps to verify the strength performance of the product.
3.Detection method.
3.1. Dimension detection.
Dimensional measurements are usually performed using tools such as rulers, tape measures, laser rangefinders, etc. In the inspection, it is necessary to pay attention to the location and method of measurement, as well as the accuracy of the measurement results.
3.2 Cable density detection.
Cable density may require the use of equipment such as microscopes, counters, etc. Cable density is calculated by taking a sample and then measuring the number of cables under a microscope or using a counter.
4.Allowable deviations.
The GB T 17794-2021 standard specifies the allowable deviation range of the external dimensions and cable density of flexible foam rubber and plastic insulation products. These deviation ranges are designed to tolerate some unavoidable errors that may exist in the production process, as well as some changes that may occur in the use of the product.
5.Detection steps.
5.1 Specimen preparation.
Specimens that meet the requirements are drawn from production to ensure that the specimens are representative.
5.2 Preparation of testing equipment.
Prepare the measurement tools required for dimensional inspection, such as rulers, tape measures, laser rangefinders, etc.;Prepare the microscopes, counters, and other equipment needed for cable density detection.
5.3. Dimension detection.
The dimensions of the specimen are inspected using the appropriate tools and the measurement results are recorded.
5.4 Cable density detection: The cable density of the sample is detected by a microscope or a counter, and the measurement results are recorded.
5.5. Allowable deviation comparison compares the test results with the allowable deviation range specified in the GB T 17794-2021 standard to judge whether the sample meets the requirements of the standard.
6.Precautions
6.1. Test environmentPay attention to the influence of the test environment on the test results, and ensure that the test environment meets the standard requirements, such as temperature, humidity, etc.
6.2. Inspectors require that inspectors should have corresponding testing skills and experience, be familiar with the requirements of GB T 17794-2021 standard, and be able to accurately and skillfully carry out size and allowable deviation detection.
6.3. In order to ensure the accuracy of the test results, repeated tests can be carried out on the same sample, and the average value can be taken as the final result.
7.Test report
7.1. Report contentThe test report should include the following contents: test items, test methods, test results, allowable deviation comparison, conclusions, etc.
7.2. Report format: The format of the test report should be standardized, clear, and easy to read and use.
8.ConclusionThrough the detection of the size and allowable deviation of flexible foam rubber and plastic insulation products, the size of the products can be ensured to meet the standard requirements, and its suitability and reliability in the insulation of construction and industrial equipment can be ensured. At the same time, the strength performance of the product can be verified by detecting the cable density. Therefore, the detection of size and allowable deviation is an important part of the quality control of flexible foam rubber insulation products.