GB/T 1463-2026Test methods for the density and relative density of fibre reinforced plastics (English PDF)

5.1 Buoyancy Method

5.1.1 Balance, scale division 0.0001g.

5.1.2 Place the sample on the tray and weigh its mass in air.

5.1.3 Impregnation container, beaker or other wide-mouthed container, containing impregnation solution and immersion sample.

5.1.4 Measuring device. When using a mesh tray (integrated with the balance density component), as shown in Figure 1a), or using a metal wire (diameter not greater than...) When the diameter is

0.125 mm, it is as shown in Figure 1b).

5.1.5 Thermometer, accurate to 0.1°C.

5.1.6 Density bottle, capacity 25mL or 50mL.

5.2 Geometric Method

5.2.1 Balance, scale division 0.001g.

5.2.2 Vernier caliper, accuracy 0.01mm.

7.3 Sample Size

7.3.1 Buoyancy Method The sample should have a smooth surface, a volume of not less than 1 cm3, and a mass of 1 g to 5 g.

7.3.2 Geometric Method The specimen should be a regular and smooth geometric shape, such as a cuboid or cylinder, and its dimension in any characteristic direction should not be less than [amount missing]. 4mm, the sample volume should be greater than 10cm3.

7.4 Sample Conditioning Before testing, the test specimens should be conditioned for at least 24 hours under the laboratory standard environmental conditions recommended by GB/T 1446, unless otherwise specified. There are regulations.

8.1 Buoyancy Method

8.1.1 Weigh the sample (m1) in air, accurate to 0.0001 g.

8.1.2 The temperature of the impregnation solution shall be measured using a thermometer. The temperature of the impregnation solution is generally (23±2)°C; when the technical specifications specify a test temperature... In case of special requirements, the technical specifications shall apply.

8.1.3 Place the sample on a mesh tray or suspend it using a wire, ensuring the sample is completely immersed in the impregnation solution within the container. The container must not touch the water. Use a wire mesh tray or the sample. Remove any air bubbles adhering to the sample as quickly as possible using another wire. Weigh the sample in the impregnation solution. (m2), accurate to 0.0001g. If necessary, the same impregnation solution can be used to pretreat the sample by methods such as ultrasonication, soaking, or centrifugation. Reduce bubble formation.

8.1.4 Repeat the test according to the specified number of samples.

8.1.5 When water and ethanol are used as impregnation solutions, their density values at different temperatures are shown in Appendix A. Alternatively, a density bottle can be used in this method. Measure the density of the impregnation solution directly before and after the first use.

8.2.1 Weigh the sample in air (m) to an accuracy of

0.001 g.

8.2.2 Measure the specimen dimensions at three points evenly distributed along each characteristic direction, accurate to

0.01 mm. The difference between the three dimensions should not exceed [a certain value]. The value exceeds 1%. The arithmetic mean of the three points is taken as the dimension of the sample in this direction, thus obtaining the volume (V) of the sample.

9.1 Density

9.1.1 Buoyancy Method The sample density is calculated according to formula (1).

9.2 Relative Density

10.Test Results According to the provisions of GB/T 1446.

11 Test Report The test report should include the following.

a) Test methods and standard numbers;

b) Description of the sample material;

c) Sample number, shape, dimensions, appearance quality, and quantity;

d) Conditioning of the test environment and the condition of the test specimen;

e) The impregnation solution and its temperature;

f) The density or relative density value of each sample at a specified temperature, and the arithmetic mean of a set of samples;

g) Personnel involved in the experiment, date, and other details.