GB/T 7044-2022Colour carbon black (English PDF)

3.1 Polycyclic aromatic hydrocarbons; PAHs

Hydrocarbons that contain two or more benzene rings in the molecule.

NOTE: According to the connection method of benzene rings, PAHs can be divided into three types: multi-phenyl alicyclic hydrocarbons, biphenyls, and fused polycyclic arenes.

3.2 Heavy metal

Metals with a density above 4.5 g/cm3.

NOTE: For example, copper, lead, zinc, tin, nickel, cobalt, antimony, mercury, cadmium, bismuth, etc.

4.1 Classification

According to the particle size and blackness of colour carbon black, it is divided into the following three categories; see Table 1.

6.3 Sampling method

6.3.1 Method A (arbitration method): Clean the part of the carbon black packaging bag that needs to be cut for sampling, cut a small cross-shaped opening slightly smaller than the outer diameter of the sampling tube, and press the sealing plate; let the oblique end of the sampling tube upwards, insert it to the required place, let the carbon black sample flow out from the nozzle, and collect it with a suitable container; after taking a sufficient amount, seal the sampling port with suitable materials and methods.

6.3.2 Method B: Disassemble the seam of the carbon black packaging bag, use a sampling spoon to separate the center of the bag opening, take a sample at a depth of about 100 mm, and sew up the bag opening after sampling.

6.4 Sample labels

Immediately after the sample is filled into a container, a label is affixed on the outer wall of the container. The label includes the following contents:

a) Sample name and serial number;

b) The batch number and quantity of the overall material;

c) Production unit;

d) Sample size;

e) Sampling location;

f) Sampling date; g) Sampling operator.

6.5 Sample storage

Sample storage and effective storage period:

a) Samples shall be kept in a dry and ventilated sample room;

b) The effective storage period of samples is 6 months.

8.3 Judgment rules

8.3.1 The quality levels of the batches of products are judged according to sample inspection results.

8.3.2 If any item of impurity material and sieve residue fails to meet the characteristic index requirements, the product is judged as unqualified. If the rest of the items do not meet the characteristic indexes, double-quantity sampling or taking double samples is allowed for re-inspection. After re-inspection with double volume or double samples, if the results meet the requirements of the characteristic indexes, the product is judged as qualified, otherwise, it is judged as unqualified.

9.1 Packaging

9.1.1 The net weight of each package of the product is (10±0.15) kg, (20±0.2) kg, or agreed upon by the supplier and the purchaser.

9.1.2 Packaging bags and materials: The packaging bags shall have the ability to prevent moisture and pollution. The following packaging materials can be selected, and the supplier and the purchaser shall agree on special circumstances.

a) Paper bag: 5 layers of kraft paper, the inner bag is 3 layers of 80 g/m2 kraft paper, and the outer bag is two layers of 80 g/m2 kraft paper.

b) Composite bag: the inner bag is 3 layers of 80 g/m2 kraft paper, and the outer bag is a plastic woven bag.

c) Other packaging that meets user requirements.