GB/T 40126-2021 English PDF (GBT40126-2021)

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GB/T 40126-2021: Liquid silicone rubber - Application for baby nipple
GB/T 40126-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.060
CCS G 35
Liquid silicone rubber - Application for baby nipple
ISSUED ON: MAY 21, 2021
IMPLEMENTED ON: DECEMBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Classification and designations ... 5 
5 Requirements ... 6 
6 Test methods ... 6 
7 Inspection rules ... 7 
8 Marks, packaging, transportation, storage ... 8 
Annex A (normative) Linear shrinkage test ... 10 
Liquid silicone rubber - Application for baby nipple
1 Scope
This Standard specifies classification and designation, technical requirements,
test methods, inspection rules, packaging, marks, transportation and storage
for liquid silicone rubber for baby nipple (hereinafter referred to as silicone
rubber for baby nipple).
This Standard is applicable to liquid silicone rubber that is used to produce
nipples and pacifiers used by infants and young children and other similar use
products.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 528, Rubber, vulcanized or thermoplastic - Determination of tensile
stress-strain properties
GB/T 529, Rubber, vulcanized -determination of tear strength (trouser, angle
and crescent test pieces)
GB/T 531.1, Rubber vulcanized or thermoplastic - Determination of
indentation hardness - Part 1: Shore hardness tester method (Shore
hardness)
GB/T 533, Rubber vulcanized or thermoplastic - Determination of density
GB/T 1681, Rubber - Determination of rebound
GB/T 2941, Rubber - General procedures for preparing and conditioning test
pieces for physical test methods
GB 4806.11, National Food Safety Standard - Food Contact Rubber
Materials and Articles
GB/T 36804, Liquid silicone rubber - Classification and system nomenclature
than 16h.
6.2.3 Hardness
Determine according to GB/T 531.1.
6.2.4 Density
Determine according to GB/T 533.
6.2.5 Tensile properties
In accordance with GB/T 528, use type 1 specimen to determine the tensile
strength and elongation at break. The number of specimens is not less than 5.
6.2.6 Tear strength
Determine according to GB/T 529. Use crescent specimen.
6.2.7 Resilience
Determine according to GB/T 1681.
6.2.8 Volatile compound content
Determine in accordance with Annex A.
6.3 Hygienic properties
Determine according to GB 4806.11.
7 Inspection rules
7.1 Type inspection
The type inspection items are all items specified in Chapter 5. In one of the
following situations, type inspection should be carried out:
a) when the product is stereotyped, the production is transferred to another
factory or the product is resumed after the production is stopped for more
than half a year;
b) when there are changes in raw materials, formulas or process conditions;
c) when there is a big difference between the exit-factory inspection results
and the previous type inspection;
d) when it shall be carried out every six months during normal production.
7.2 Exit-factory inspection
The exit-factory inspection items shall include: appearance, hardness, density,
tensile strength, elongation at break, tear strength, resilience.
7.3 Batching and sampling
Take the products not more than 2000kg but of the same raw materials, the
same formula, and the same process as a batch.
2kg of samples are randomly selected from each batch.
7.4 Qualification judgement
If the inspection items meet the requirements of Chapter 5, the batch of
products is qualified. If any item of the inspection result is not in conformity,
double sampling may be used to re-inspect the unqualified items. If the re-
inspection result meets the requirements, the batch of products is qualified. If
the re-inspection results still do not meet the requirements, the batch of
products is not qualified.
8 Marks, packaging, transportation, storage
8.1 Marks
The surface of the product or packaging shall at least indicate the following
information:
a) Manufacturer's name (or trademark) and address;
b) Reference to this Standard;
c) Product name;
d) Designation;
e) Batch number;
f) Date of manufacture;
g) Net weight or capacity.
8.2 Packaging
The product is packed in clean, dry and well-sealed iron or plastic drums. Other
packaging methods agreed between the manufacturer and the user can also
be used. Each batch of products shall be accompanied by a product certificate,
quality inspection report and product instruction manual.
Annex A
(normative)
Linear shrinkage test
A.1 Overview
Dry the specimen at high temperature. Determine the content of volatile
compounds by mass change.
A.2 Instruments and equipment
A.2.1 Oven: 200°C±5°C, ventilated.
A.2.2 Desiccator.
A.2.3 Balance: the accuracy is 0.1mg.
A.2.4 Shallow aluminum foil box.
A.2.5 Mold: 2mm thick.
A.3 Specimen preparation
Weigh a certain amount of unvulcanized liquid silicone rubber. Mix well
according to the product manual. After vacuum deaeration, put it into the cold-
mold mold. Refer to the product manual for specific curing conditions.
The specimen shall be smooth and clean, uniform in thickness, and free of
bubbles.
The specimen size shall meet the requirements of each test performance.
A.4 Test steps
A.4.1 Cut the vulcanized rubber test piece into a small square with a side length
of about 1cm. Weigh about 10g of specimen. Place in a desiccator (A.2.2) and
park at room temperature for 48h.
A.4.2 Weigh the weight of the shallow aluminum foil box (A.2.4) with a balance
(A.2.3). Record as m0. Remove the specimen from the desiccator and place it
in an aluminum foil box. Weigh it and record as m1. Then put it into an oven
(A.2.1) at a temperature of 200°C±5°C and keep it for 4h. Take it out. Put it in a
desiccator to cool for 1h. Take it out and weigh. Record as m2.
A.4.3 If the test material is a paste, only need to take 10g ± 0.5g of specimen