GB/T 26026-2010 English PDF (GBT26026-2010)

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GB/T 26026-2010: Methyltin mercaptide
GB/T 26026-2010
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.080.60
G 17
Methyltin mercaptide
硫醇甲基锡
ISSUED ON: JANUARY 10, 2011
IMPLEMENTED ON: OCTOBER 01, 2011
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms, definitions, and symbols ... 5 
4 Requirements ... 6 
5 Test methods ... 7 
6 Inspection rules ... 8 
7 Marking, packaging, storage, transportation ... 10 
8 Contents of contract (or order form) ... 11 
Appendix A (Normative) Determination of sulfur content in methyltin mercaptide -
Iodometric titration ... 12 
Appendix B (Normative) Determination of light transmittance in methyltin mercaptide
-Spectrophotometry ... 15 
Appendix C (Normative) Determination of acid value in methyltin mercaptide - Sodium
hydroxide titration ... 17 
Methyltin mercaptide
1 Scope
This Standard specifies the requirements, test methods, inspection rules, marking,
packaging, storage, transportation, quality certificate, and contents of contract (or order
form) of methyltin mercaptide.
This Standard applies to methyltin mercaptide produced from tin and isooctyl
thioglycolate as raw materials.
2 Normative references
The following documents are indispensable for the application of this document. For
the dated references, only the editions with the dates indicated are applicable to this
document. For the undated references, the latest edition (including all the amendments)
are applicable to this document.
GB/T 601 Chemical reagent - Preparations of reference titration solutions
GB/T 603 Chemical reagent - Preparations of reagent solutions for use in test
methods (neq ISO 6353-1:1982)
GB/T 3143 Color determination method of liquid chemicals (Hazen unit - Platinum-
cobalt scale)
GB/T 4472 Determination of density and relative density for chemical products
GB/T 6488 Liquid chemicals - Determination of refractive index at 20 Celsius
GB/T 6678 General principles for sampling chemical products
GB/T 6680 General rules for sampling liquid chemical products
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 10247 Methods of viscosity measurement
GB/T 10574.1 Methods for chemical analysis of tin-lead solders - Determination of
tin content
The determination of sulfur content shall be carried out in accordance with the
provisions of Appendix A.
5.4 Determination of density
Use the method of GB/T 4472 for determination.
5.5 Determination of viscosity
Use the "2 Capillary tube method" in GB/T 10247 for determination.
5.6 Determination of light transmittance
The determination of light transmittance shall be carried out in accordance with the
provisions of Appendix B.
5.7 Determination of chromaticity
Use the method of GB/T 3143 for determination.
5.8 Determination of refractive index
Use the method of GB/T 6488 for determination.
5.9 Determination of acid value
The determination of acid value is carried out in accordance with the provisions of
Appendix C.
5.10 Visually inspect the color and appearance of the product.
6 Inspection rules
6.1 Inspection and acceptance
6.1.1 The product shall be inspected by the quality and technical supervision department
of the supplier, to ensure that the product conforms to the provisions of this Standard or
the contract (or order form). It shall fill out the product quality certificate.
6.1.2 The purchaser shall inspect the received products according to the provisions of
this Standard. If the inspection result does not conform to this Standard or the content
of the contract (or order form), it shall be submitted within 30 days from the date of
receipt of the product. The supplier and the purchaser shall negotiate and resolve it. If
arbitration is required, both the supplier and the purchaser shall jointly collect the
arbitration samples from the purchaser.
6.2 Batch grouping
product batch number, testing items, sampling date, etc. At the same time, paste a seal
on the seal of the sample container. The seal must be signed by both the supplier and
the purchaser.
6.5 Determination of inspection results
6.5.1 The rounding and determination of the numerical value of inspection results shall
be carried out in accordance with GB/T 8170.
6.5.2 If one of the inspection results of the product quality index does not conform to
the provisions of 4.3 of this Standard or the contract (or order form), it shall take double
the specimen quantity specified in 6.4.2.1 from this batch of products to repeat the test.
If the repeated test results are all conformity, this batch of products is determined to be
conformity. If the repeated test results still do not meet the requirements of 4.3 of this
Standard, this batch is determined to be nonconformity.
6.5.3 When the color and appearance quality do not meet the requirements of this
Standard, the barrel shall be determined to be nonconformity.
7 Marking, packaging, storage, transportation
7.1 Marking
Each barrel of product shall indicate:
a) Manufacturer's name and trademark;
b) Product name;
c) Executive standard and designation;
d) Product batch number and mass;
e) Production date, manufacturer address, and user instructions, etc.
7.2 Packaging, storage, transportation
7.2.1 Packaging.
It shall be packed in Teflon iron barrels or polyethylene blow-molded barrels, 250
kg/barrel. It can also be packaged according to user requirements.
7.2.2 Storage and transportation.
Store the product in a cool and dry place; after use, seal it immediately. During
transportation, this product shall be protected from rain and sunlight, and be handled
with care.
Appendix A
(Normative)
Determination of sulfur content in methyltin mercaptide - Iodometric titration
A.1 Scope
This part specifies the method for the determination of sulfur content in methyltin
mercaptide.
This part applies to the determination of sulfur content in methyltin mercaptide.
Determination range: 5.00%~15.00%.
A.2 Method summary
Dissolve the specimen in absolute ethanol; use iodine standard solution to titrate to
yellow as the end point.
A.3 Reagents
A.3.1 Absolute ethanol.
A.3.2 Iodine standard solution [c(1/2I2)=0.05 mol/L].
A.3.2.1 Preparation: Weigh 32.8 g of iodine and 87.5 g of potassium iodide; dissolve in
100 mL of water; dilute to 5000 mL and shake well; store in a brown bottle.
A.3.2.2 Calibration: Weigh 1.5 g of benchmark arsenic trioxide (accurate to 0.0001 g);
add 40 mL of sodium hydroxide solution [c(NaOH)=1 mol/L] to dissolve; add 2 drops
of phenolphthalein indicator (10 g/L); use sulfuric acid solution [c(1/2H2SO4)=1.0
mol/L] for neutralization. Add 3 g of sodium bicarbonate solution to dissolve; transfer
to a 200 mL volumetric flask; use water to dilute to the mark and shake well. Pipette 10
mL of arsenic trioxide solution (this solution contains 0.0075 g of arsenic trioxide per
milliliter). Add 20 mL of saturated sodium bicarbonate solution, 3 mL of starch (10 g/L);
use the prepared iodine standard solution to titrate, until the solution turns blue; do a
blank test at the same time.
According to formula (A.1), calculate the actual concentration of iod...