QB/T 1642-1992 Test method for apparent porosity and bulk density of ceramic bodies

This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of polyethylene color masterbatch (hereinafter referred to as masterbatch). This standard is applicable to masterbatch made of polyethylene resin and pigment as the main raw materials and extruded into granules. QB/T 1642-1992 Test method for apparent porosity and bulk density of ceramic green bodies QB/T1642-1992 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
Test Method for Apparent Porosity and Bulk Density of Ceramic Body 1 Subject Content and Scope of Applicationwww.bzxz.net
QB/T 1642—1992
This standard specifies the determination of apparent porosity and bulk density of ceramic body by oil immersion method, boiling method or vacuum method. This standard is applicable to raw ceramic body and bisque fired ceramic body. 2 Principle
The volume is determined by liquid static weighing method, and the apparent porosity and bulk density are calculated. 3 Apparatus, vacuum, medium liquid
3.1 A balance with a sensitivity of 0.001g.
3.2 A drying oven with a temperature difference of ±5°C. 3.3 A set of vacuum apparatus with a vacuum degree not less than 0.095MPa. 3.4 A set of boiling apparatus.
3.5 A set of wire frame and suspension cable that can suspend the sample in the liquid and weigh the mass of the suspended state. 3.6 A container that can hold the sample and the wire frame. 3.7
A cotton towel, a brush, etc.
3.8 Distilled water, kerosene.
4 Sample requirements
4.1 Three samples are required for the test.
4.2 Six test pieces of basically the same size are taken from the three samples. Each test piece weighs 5 to 20g, and the weight difference does not exceed 2g. 4.3 The sample should be unglazed, raw or plain fired. For glazed ones, the glaze layer should be scraped off. The cross section of the sample should not be uneven, and the surface should be cleaned with a brush.
5 Test steps
5.1 Bake at 105 to 110℃ for 2h, cool in a dryer to room temperature, weigh its mass (m), accurate to 0.001, and then bake for another 30min, weigh, and the difference between the two weighings should not exceed 0.020g, otherwise, dry again. 5.2 The oil immersion method shall be used for raw ceramics, and the boiling method or vacuum method shall be used for bisque fired ceramics. 5.2.1 Oil immersion method
Put the raw sample in a container with a wire frame, and then add kerosene, so that the sample is completely placed in the kerosene and does not touch any part of the container. The liquid level should exceed the sample by (20±5) mm. Let it stand for 24 hours, and gently wipe off the excess kerosene on the surface of the sample with a cotton towel saturated with kerosene, and immediately weigh (m). Accurate to 0.001g.
5.2.2 Boiling method
Put the bisque fired sample in a container with a wire frame, and then add distilled water, so that the sample is completely placed in the distilled water, and boil for 3 hours. During the boiling process, the liquid level should remain above the sample by (20±5) mm. Cool to room temperature, and gently wipe off excess water on the surface of the sample with a cotton towel saturated with distilled water. Approved by the Ministry of Light Industry of the People's Republic of China on January 15, 1993, and implemented on September 1, 1993
Weigh immediately (m), accurate to 0.001g. 5.2.3 Vacuum method
QB/T 1642—1992
Put the burnt sample into a container separated by a wire frame and place it in a vacuum device. Keep the vacuum for 10 min at a vacuum degree of not less than 0.095 MPa. Inject distilled water until the liquid level exceeds the sample by (20 ± 5) mm. Keep the vacuum degree at not less than 0.095 MPa for 30 min. Open the vacuum device, take out the sample, wipe off the excess liquid on the surface of the sample with a cotton towel saturated with distilled water, and weigh (m2) immediately to an accuracy of 0.001 g
5.3 Hang the wire frame on one end of the balance and sink it in the container containing the medium liquid. Calibrate the balance to zero. Then put the sample saturated with the medium liquid into the wire frame without contacting any part of the container. The liquid level should be kept about (60 ± 5) mm above the sample. Weigh (m2) to an accuracy of 0.001 g. 6 Calculation method
Apparent porosity is calculated according to formula (1); bulk density is calculated according to formula 2). m,-m
m - mz
Where:. Apparent porosity, %
D Bulk density.g/cm\
m——mass of sample in g;
mMass of sample after saturation with medium liquid, g;
Mass of sample submerged in medium liquid in g;
dm--true density of medium liquid, g/cm.
7 Report
The test report shall include the following contents.
8 Accuracy
Sample name;
Type of medium liquid:
Density of medium liquid;
Test method;
Ambient temperature;
Other situations that need to be explained.
8.1 Apparent porosity
The difference between the maximum and minimum values ​​of six test pieces tested in parallel, porcelain raw and bisque 0.8%; pottery raw and bisque ≤1.5%: otherwise, re-sample and measure. 8.2 Bulk density
The difference between the maximum and minimum values ​​of six test pieces tested in parallel, porcelain raw and bisque ≤0.1g/cm; pottery raw and bisque ≤0.3g/cm. Otherwise, re-sample and measure. 210
Additional remarks:
This standard is proposed by the Quality Standards Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Ceramic Standardization Center. QB/T1642-1992
This standard is drafted by the Ceramic Industrial Science Research Institute of the Ministry of Light Industry. The main drafters of this standard are Li Youzhi and Cheng Guoan. From the date of implementation of this standard, the former Ministry of Light Industry Standard QB973-1986 "Analysis Method of Apparent Porosity and Bulk Density of Daily-use Ceramic Mud" will be invalid.
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