HG 3055-1988 Determination of apparent density of latex sponge HG3055-1988 standard download decompression password: www.bzxz.net

UDC 678.4. 031:531.754
National Standard of the People's Republic of China
GB 9891—88
Adjusted to: HG 30r-188
Latex foam-- Determination of apparent density
Latex foam-- Determination of apparent densityPublished on 198809-20
State Bureau of Technical Supervision
Implemented on 1989-05-01
National Standard of the People's Republic of China
Determination of apparent density of latex sponge
GB 9891 -88
Published by China Standards PresswwW.bzxz.Net
(Beijing Fuwai Sanlihe)
China Standards Press Printed by Beijing Printing Factory Distributed by Xinhua Bookstore Beijing Distribution Office Sold by Xinhua Bookstores in all regions Copyright reserved Reproduction prohibited
Format 880×12301/16 Printing sheet 1/4
Word count 4000
First edition in June 1989 Second printing in June 1989 Number of copies 1～2500
Book number: 155066-1-6363
Price 0.25 yuan
Heading 115—40
National Standard of the People's Republic of China
Litex foam-Determination of apparent density
Litex foam-Determination of apparent density This standard adopts ISO845-1977 (Foam rubber and plastics 1 Subject content and applicable scope
This standard specifies the method for determining the apparent density of latex sponge. Determination of apparent density》,
UDC 678. 4. 031
GB 9891—88
This standard applies to the measurement of the apparent density of latex sponge products with natural latex and synthetic latex as the main raw materials. 2 Reference standards
GB9889 Determination of linear dimensions of latex sponge
3 Definition
Apparent density is the mass of sponge material per unit volume at specified temperature and humidity. 4 Test instruments and materials
4.1 Level; accurate to 0.5% of the sample mass. 4.2 Measuring tools: in accordance with the provisions of GB9889.
4. 3 Flaxseed, pure flaxseed with full seeds and no insects, lumps or other foreign matter. 4.4 Glass jar: a cylindrical glass jar with a diameter of 25-30cm and a height of 15-20cm. The jar body may be marked with scale (in millimeters) or without scale.
4.5 Sponge cutter: a latex sponge cutter that does not deform the sample, does not damage the foam structure of the sample, and has a smooth cutting surface. It is recommended to use the BOSCH1675 double-insulated rubber sponge cutter produced in the Federal Republic of Germany. 5 Sample classification
Class I coreless latex sponge
Class II core latex sponge
6 Samples
6.1 Shape and size
The sample should be cut at a position more than 2cm away from the top of the sample. For Class I samples, the sample should be cut into a shape that is easy to measure its volume. For Class II samples, the sample can be cut into any shape. The volume of each sample should not be less than 100 cm\, the cutting surface of the sample should be flat, and the foam structure should not be damaged. 6.2 Quantity
Take at least three samples of the same sample.
6.3 Storage conditions
Approved by the Ministry of Chemical Industry of the People's Republic of China on August 8, 1988 and implemented on May 1, 1989
GB 9891-88
The sample cannot be tested within 72 hours after preparation; before the test, the sample should be stored for no less than 16 hours at 23±2℃, relative humidity 50%-5%; or 272℃, relative humidity 65%-5% without external force. 7 Test steps
7.1 Sample mass measurement: Under the conditions of 6.3, weigh the sample mass in grams. 7.2 Sample volume measurement: Under the conditions of 6.3, measure the sample volume by one of the following methods. 7.2.1 Method A: Applicable to Class 1 samples. According to GB9889, measure the size of the sample and calculate the sample volume in cubic millimeters. 7.2.2 Method B: Applicable to Class II samples. Place the glass cylinder on a horizontal surface, put the sample into the glass cylinder, and fill the sample gap with flax seeds until the sample is covered by about 2 cm. Make the flax seed surface flat, and measure the height of the flax seed filling surface at six points (or more than six points) evenly distributed along the circumference of the cylinder, and take the arithmetic mean. After taking out the sample, use the same method to measure the height of the flax seed surface, and calculate the difference between the two measured volumes before and after, which is the sample volume in cubic meters. 8 Result expression
The apparent density of the sample is calculated by the following formula:
In the formula; P\--apparent density of the sample, kg/m-
mass of the sample, area;
. Sample volume, mm\.
The result is rounded to 0.1.kg/m.
Test report
The test report shall include the following contents:
Sample name, category and number,
Test items and results;
Number of samples:
Sample description (sample cutting position, whether there is skin or other visible defects): Laboratory temperature, brightness,
Name or number of the standard based on which the test is conducted, any inconsistency with the standard1
Test date.
Additional remarks:
This standard is under the jurisdiction of the Latex Industry Research Institute of the Ministry of Chemical Industry, and was drafted by the Latex Industry Research Institute of the Ministry of Chemical Industry. The main drafter of this standard is Chen Yunchuan.
Copyright reserved. No reproduction allowed
Book number: 155066-1-6363
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