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GB/T 8142-2008: Methods of sampling lac products
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 8142-2008	English	169	Add to Cart	3 days [Need to translate]	Methods of sampling lac products
GB/T 8142-1987	English	199	Add to Cart	2 days [Need to translate]	Methods of sampling lac products

GB/T 8142-2008: Methods of sampling lac products

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Methods of sampling lac products ICS 65.020 B72 National Standards of People's Republic of China Replacing GB/T 8142-1987 Lac products sampling methods Posted 2008-12-31 2009-03-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard replaces GB/T 8142-1987 "lac products sampling methods." This standard compared with GB/T 8142-1987, the main changes are as follows. --- Chapter 1, "Introduction" to "scope", by deleting "other" content; --- Modify the size requirements for sample preparation; --- Increased content analysis sample preparation. This standard was proposed by the State Forestry Administration. The standard by the China Academy of Forestry Forest Research Institute of Chemical Industry. This standard by the Chinese Academy of Forestry Forest Research Institute of Chemical Industry is responsible for drafting. The main drafters of this standard. Wang Yongmei, Chen Jia-hong, WU Dong-mei, Wu Song. This standard replaces the standards previously issued as follows. --- GB/T 8142-1987. Lac products sampling methods

1 Scope

This standard specifies the method of sampling lac products, sample preparation and sample storage. This standard applies to particles shellac, shellac, decolorized shellac, dewaxed shellac, dewaxed shellac decolorized, military shellac, bleached shellac Refined bleached shellac and shellac and other products.

2 Sampling method

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 Sample Preparation

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.

4 Sample Storage

The remaining 150g laboratory sample (3.1) in a clean, dry jars, sealed, should be pasted on the bottle label, label content With 3.2.1, save spare. ...