1 Scope
This standard specifies the sampling method and testing method for quality inspection of washed feather and down.
This standard is applicable to the determination on content of duck feather (down), down fiber and impurity in down, landfowl feather, heterochromatic feather/down, long feather and goose feather (down) as well as testing on physical and chemical indexes such as filling power, moisture content, residual fat rate, cleanliness, oxygen consumption, odor and microorganisms (mesophilic aerobic bacteria, streptococcus faecalis, clostridium reduced by sulfurous acid and salmonella).
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest editions apply.
GB/T 8170 Rules for Rounding off of Numerical Values
3 Sample Preparation
3.1 Sampling inspection by batches
3.1.1 Sampling tools: special clean sample bag and sample tube.
3.1.2 Sampling method: samples are taken from the finished products. Samples are taken from three different parts, i.e., upper, middle and lower parts, of the sampled product during sampling.
3.1.3 Sampling quantity: four samples are taken, with the minimum amount of 500kg; the mass of each sample is about 250g, and the quantity of samples shall be greater than half of the total quantity of a batch. For each 500kg increase in batch size, the quantity of samples taken is one tenth of the quantity increased.
3.2 Sampling of laboratory specimens
3.2.1 Sampling tools: clean and sealable metal sample tube for water content testing while clean cloth bag, paper bag and plastic bag for sampling for other items.
3.2.2 Sampling quantity: the mass of each sample is 250g at least.
3.2.3 Sampling method, same as that in 3.1.2.
3.3 Specimen preparation
3.3.1 Sample homogenization: mix the samples taken from this batch, divide them into four portions with square dichotomy, and then take each portion as four homogenized specimen. The mass of each sample is about 250g.
3.3.2 For four homogenized specimens, two are used for testing, one for standby and one for storage.
3.3.3 Storage time: six months generally, which may be extended to one year in special circumstance.
Note: special circumstance mainly refers to the sales time of product. Where the sales time is extended, the sample storage time shall be extended accordingly.
3.3.4 Storage conditions: the samples shall be clearly batched, classified, numbered, labeled, and stored in a sample cabinet in a clean and dry special sample room.
Foreword i
1 Scope
2 Normative References
3 Sample Preparation
4 Content Inspection
5 Determination of Filling Power
6 Determination of Moisture Content
7 Determination of Residual Fat Rate
8 Cleanliness Determination
9 Oxygen Consumption Determination
10 Determination of Odor
11 Determination of Microorganism
Annex A (Normative) Microstructures of Goose and Duck Feather/Down
