GB/T 8142-2008Methods of sampling lac products (English PDF)

2.1 the number of samples collected

Analysis of a sample to deal with the entire batch adequate representation. Test samples with each batch of products should be chosen at random at least 10%

Boxes (bags), a minimum of not less than 5 boxes, up to no more than 25 cases, and had extracted from the unopened original boxes (bags) in different parts.

2.2 lac loose product sampling

General loose lac product samples, available sampling spoon to extract roughly equal numbers of samples from each box (bag) in different parts of the total weight of about

5kg.

2.3 lac caking product sampling

Caking shellac products from different parts of the sample size or split take chisel take samples extracted from each box (bag) is approximately equal to the total weight of about

5kg.

3.1 laboratory sample

The extracted sample is thoroughly mixed with the quartering points shrink, shrink take two diagonal sample and mix well. And then divided into four equal parts, mix 2 Corner like,

Ground until completely mixed by pore size of about 2mm sieve (equivalent to 10 mesh), and is divided into four equal parts, each about 300g.

3.2 Analysis of samples

3.2.1

laboratory sample taken (3.1) 100g, completely crushed to sieve through the pore diameter of about 0.4mm (equivalent to 40 mesh), in a clean, dry,

Glass jar with a ground, the test used for analysis. Attach a label on the bottle and indicate the manufacturer's name, product name, batch number, date and place of sampling

Points.

3.2.2

laboratory sample taken (3.1) of about 40g, crushed to completely through the sieve pore diameter of about 0.3mm (equivalent to 60 mesh), in a clean, dry

Dry, with a ground glass jar for analysis for inspection. Pasted on the bottle label and indicate the manufacturer's name, product name, batch number, date of sampling

And location.

3.2.3

laboratory sample taken (3.1) of about 10g, crushed to completely through the sieve pore diameter of about 0.2mm (equivalent to 80 mesh), in a clean, dry

Dry, with a ground glass jar for analysis for inspection. Pasted on the bottle label and indicate the manufacturer's name, product name, batch number, date of sampling

And location.