GB/T 3782-2016Acetylene black (English PDF)

6.1 Type inspection

Type inspection items are all items, which are specified in Chapter 4. Type inspection shall be carried out in one of the following situations:

a) When a new product or an old product after trans-plant production, is subject to trial production and type finalization;

b) When there are major changes in raw materials and processes during production, which may affect product performance;

c) During normal production, periodic inspections are carried out to assess the stability of product quality;

d) When the production is resumed after the suspension of production;

e) When there is a big difference between the exit-factory inspection result and the last inspection result;

f) When the national quality supervision agency puts forward a type inspection request.

6.2 Exit-factory inspection

The exit-factory inspection items are divided into three cases: dry batteries, acetylene black for radio components, 100% compressed products:

a) Test items of acetylene black for dry battery: Apparent specific volume, iodine absorption value, hydrochloric acid absorption, resistivity, heating loss, ash, coarse grain fraction.

b) Test items of acetylene black for radio components: Apparent specific volume, iodine absorption value, hydrochloric acid absorption, resistivity, pH value, heating loss, ash, coarse grain fraction.

In order that the collected samples can represent the quality of the batch of products, all the collected samples shall be mixed thoroughly.

7.6 Sample label

After the sample is placed in the container, it shall affix a label on the outer wall of the container. The label content includes:

a) Sample category and number;

b) Overall material batch number and amount;

c) Manufacturer;

d) Sample amount;

e) Sampling location;

f) Sampling date;

g) The name of the sampler.

7.7 Sample preservation

7.7.1 The samples shall be stored in a sample chamber, which has a suitable temperature and humidity.

7.7.2 The shelf life of samples shall be at least 6 months.

9.1 Packaging

9.1.1 At the end of the production process, it is packaged in bags. The packaging bag is a flat rectangular parallelepiped. The net weight of each the height gauge, to make the number display "0000". At this time, the height reference has been adjusted; the actual height is 10.00 mm now.

A.4.4 Fill a certain amount of dry specimen into the specimen container. Then put the specimen container into the positioning seat. The specimen is filled in a loose state. It shall not apply external force to load it forcedly. When placing the upper test electrode, be careful not to use excessive force as much as possible.

A.4.5 Rotate the pressure handwheel

When the upper test electrode touches the specimen, apply pressure to the specimen in the cylinder, to compress it.

The pressure begins to increase gradually, until the pressure is steadily increased to 8.2 MPa.

A.4.6 Observe the height of the specimen: After applying a certain pressure, observe the digital display value of the height. The actual height of the specimen = The digital display value of the height + 10 mm. It is required that the height of the specimen after applying pressure is (16 ± 0.04) mm; otherwise, it shall take sample again.

A.4.7 Measurement of resistivity: Press down the measurement selection

switch to the "Resistivity". After the displayed value is stable, directly read the resistivity value.

A.5 Measurement results

Take the arithmetic average of the two measurements as the measurement result. Round it off, according to GB/T 8170.

A.6 Test report

The test report includes the following:

a) The identification and number of the specimen;

b) Number of this standard;

c) The temperature of the test;

d) The humidity of the test;

e) The pressure of the test;

f) The height of the specimen to be tested;

g) Test results (average value); h) Test date. […]