QB/T 1873-2010Shoe upper leather (English PDF)

3.1 See Table 1 for the product classification. And the classification of each type of

leather includes the sectional-layer leather of its kind.

Table 1 Classification

Category Cattle, horse, mule leathers Pig leather Sheep leather Other leathers

Thickness /mm

Type I >1.5 >0.9 >1.5

Type II 1.3-1.5 0.6-0.9 1.0-1.5

Type III < 1.3 < 0.6 < 1.0

4.1 Limit of harmful substances

It shall comply with provisions indicated in GB 20100 and Table 2.

Table 2 Limit value of harmful substances

Items

Limit value

Class A

(Infants'

product)

Class B

(Products in direct

contact with the skin)

Class C

(Products in indirect

contact with the skin)

Decomposable harmful

aromatic amine dyes

/(mg/kg)

<=30

Free formaldehyde (mg/kg) <=20 <=75 <=300

Note. See GB 20100 for names of banned aromatic amines. If the content of 4-aminobiphenyl and (or)

2-naphthylamine exceeds 30 mg/kg, and there is no other evidence, it still can not be concluded

that the banned azo dye is used, with existing scientific knowledge.

4.2 Physiochemical property indexes

It shall comply with provisions indicated in Table 3.

leather; 500g for suede leather, and internal surface of unlined shoe's upper leather. 50

times for dry rubbing; and 10 times for wet rubbing.

6.8 Odor

Determine according to the provisions of QB/T 2725.

6.9 Shrink temperature

Determine according to the provisions of QB/T 2713.

6.10 pH and dilution difference

Determine according to the provisions of QB/T 27124.

6.11 Sensory requirements

Under the suitable light, choose the clear sight distance to conduct sensory inspection.

7.1 Batch-group

The products of the same variety, produced by the same type of raw material and same

process shall consist as an inspection batch.

7.2 Ex-factory inspection

Products must be inspected; passing the inspection; and attached with certificate; before

leaving the factory.

7.3 Type inspection

7.3.1 Inspection cycle

Type inspection shall be conducted if there is one of the following conditions.

a) When the raw materials, process or chemical materials have significant changes;

b) When the production is resumed after a long-term shutdown (six months);

c) When the national quality and supervision agency puts forward requirements for

type inspection;

d) During the normal production, type inspection shall be conducted semiannually;

7.3.2 Sampling quantity

Randomly choose 3 sheets (pieces) for inspection from the products passing the

inspection.

7.3.3 Qualified determination

7.3.3.1 Decision rules for single sheet (piece)

— If one of the banned azo dye, free formaldehyde, tear load, coating folding

endurance, bursting height, colour fastness to rubbing and odor is unqualified; or

crack surface, crazing and other defects occurs and affects the use function, then

the sheet (piece) is judged as unqualified;

— If accumulative two items of the specified load elongation, bursting strength, shrink

temperature, pH, and pH dilution difference are unqualified, then the sheet (piece) is

judged as unqualified;

— If one item of the specified load elongation, bursting strength, shrink temperature,

pH, and pH dilution difference is unqualified; and there are accumulative two items

of sensory requirements that are unqualified, the sheet (piece) is judged as

unqualified;

— When the limit of harmful substances and physiochemical property indexes are all

qualified; and more than 3 items of sensory requirements are unqualified, then the

sheet (piece) is judged as unqualified.

7.3.3.2 Decision rules for the whole batch

In three sheets (pieces) of test samples, if all the three samples are qualified, then the

batch of the products is judged as qualified. If one sheet (piece) or more than one are

unqualified, then double sampling 6 sheets (pieces) for re-inspection. If one sheet (piece)

or more than one are unqualified in the six sheets (pieces), then the batch of the products

is judged unqualified.