GB/T 12008.2-2010 PDF in English
GB/T 12008.2-2010 (GB/T12008.2-2010, GBT 12008.2-2010, GBT12008.2-2010)
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Plastics -- Polyether polyols -- Part 2: Specification
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Polyether polyols--Specification
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Standards related to (historical): GB/T 12008.2-2010
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GB/T 12008.2-2010: PDF in English (GBT 12008.2-2010) GB/T 12008.2-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080;83.080.20
G 32
Replacing GB/T 12008.2-1989
Plastics - Polyether polyols - Part 2: Specification
ISSUED ON: SEPTEMBER 26, 2010
IMPLEMENTED ON: AUGUST 01, 2011
Issued by: General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Main representative products ... 6
4 Requirements ... 7
5 Test methods ... 11
6 Inspection rules ... 12
7 Marking, packaging, transportation and storage ... 13
Appendix A (Informative) Comparison of new and old specifications of the
main representative products ... 14
Appendix B (Normative) Determination of pH value ... 15
Plastics - Polyether polyols - Part 2: Specification
1 Scope
This part of GB/T 12008 specifies the requirements, test methods, inspection
rules and marking, packaging, transportation, storage of polyether polyols 113E,
210, 220, 220X, 330E, 348H, 330, 330X, 360H, 310, 403, 6305, 8305.
This Part applies to polyether polyols 113E, 210, 220, 220X, 330E, 348H, 330,
330X, 360H, 310, 403, 6305, 8305, which are prepared by ring-opening
polymerization of polyol and propylene oxide, (or) polyol and propylene oxide,
and ethylene oxide under the action of a catalyst.
2 Normative references
The terms in the following documents become the terms of this Part by
reference to this Part of GB/T 12008. For dated references, all subsequent
amendments (not including errata content) or revisions do not apply to this Part.
However, parties to agreements that are based on this Part are encouraged to
study whether the latest versions of these documents can be used. For undated
references, the latest edition applies to this Part.
GB/T 605-2006, Chemical reagent - General method for the measurement
of colour (eqv ISO 6353-1:1982)
GB/T 6678-2003, General Principles for Sampling Chemical Products
GB/T 6680-2003, General rules for sampling liquid chemical products
GB/T 6682-1992, Water for laboratory use; Specifications (ISO 3696:1987,
MOD)
GB/T 12008.1-2009, Plastics - Polyether polyols - Part 1: Designation system
GB/T 12008.3-2009, Plastics - Polyether polyols - Part 3: Determination of
hydroxyl number
GB/T 12008.4-2009, Plastics - Polyether polyols - Part 4: Determination of
sodium and potassium
GB/T 12008.5-2010, Plastics - Polyether polyols - Part 5: Determination of
acidity as acid number
5.10 Determination of pH value
Measure according to the method that is specified in Appendix B.
6 Inspection rules
6.1 Inspection classification and inspection items
The inspection of polyether polyol products is delivery inspection; all items in
4.1 and 4.2 of this Part are delivery inspection items.
6.2 Batching rules and sampling plan
6.2.1 Batching rules
For polyether polyols, the products are batched in batches by each production
tank or the same tank of products that are evenly mixed.
Products are inspected and accepted in batches.
6.2.2 Sampling plan
The number of sampling units is in accordance with GB/T 6678-2003. The
sampling method is carried out in accordance with the regulations in GB/T
6680-2003. The sampling container shall be dry and clean; the total sampling
volume shall not be less than 250 mL. Divide the obtained samples into two dry
and clean sampling bottles; seal them; label them; indicate: product name,
specification, batch number, production date, sampling time; one bottle for
inspection, and the other, after being sealed and stored, for future reference.
6.3 Determination rules and reinspection rules
6.3.1 Determination rules
Polyether polyols shall be inspected by the quality inspection department of the
manufacturer in accordance with the test methods that are specified in this Part;
the quality of the product shall be determined based on the inspection results
and the requirements in this Part.
When the products are delivered, each batch of products shall be accompanied
by a product quality certificate, which shall indicate the product name,
specification, grade, batch number, analysis date, inspector, inspection result,
implementation standard and name of the manufacturer, and sealed with the
delivery inspection stamp.
6.3.2 Reinspection rules
If any indicator of the test result does not meet the requirements of this Part,
the item shall be re-sampled for re-inspection. Use the re-inspection result as
the basis for determining the quality of the batch.
7 Marking, packaging, transportation and storage
7.1 Marking
The packaging containers of polyether polyol products shall have clear and firm
marking. The marking content may include: product name, specification, grade,
net content, production date, batch number, standard number, name and site of
the manufacturer, etc.
7.2 Packaging
The packaging container for polyether polyol products shall be a clean and dried
iron drum with painted inner film. The lid of the packaging container shall be
strictly sealed; there shall be an outer cover; the net content of the barreled
product is 200 kg per barrel. Other types of clean packaging containers can
also be used. Each batch of products shall be accompanied by a quality
certificate.
7.3 Transportation
Polyether polyols are non-dangerous goods. During transportation, it shall be
protected from rain and contamination, and shall be handled with care, to
prevent collision with hard objects and leakage.
7.4 Storage
Polyether polyol products shall be stored in a ventilated, dry and cool place.
The product, under the packaging, transportation and storage conditions
specified in this Part, has a storage period of 1 year from the date of production.
Appendix B
(Normative)
Determination of pH value
B.1 Reagents and solutions
Unless otherwise stated, only use analytical reagents. The test water shall meet
the specifications for grade-3 water in GB/T 6682-1992.
B.1.1 Isopropanol aqueous solution (prepared for current use): Mix isopropanol
and water in a volume ratio of 10:6;
B.1.2 Sodium hydroxide solution: 0.01 mol/L;
B.1.3 Hydrochloric acid solution: 0.01 mol/L;
B.1.4 pH buffer;
B.1.5 KCl filling solution and electrode storage solution.
B.2 Apparatus
B.2.1 pH meter: accurate to 0.01;
B.2.2 Magnetic stirrer;
B.2.3 Balance: accurate to 0.1 g.
B.3 Analysis steps
B.3.1 Use "two-point calibration" to calibrate the pH electrode; use a pH buffer
whose pH is 6.86 to calibrate the first point; then, select a pH buffer close to the
estimated to-be-tested solution to calibrate the second point; use these two pH
buffers to calibrate the pH electrode; adjust the temperature compensation
knob to the temperature of the buffer, or the instrument automatically
compensates for the temperature. The display slope of 90% ~ 100% indicates
that the electrode is in good condition and can be used; if the slope is greater
than 100%, check the calibrated pH buffer; if the slope is 85% ~ 90%, the
electrode needs to be cleaned; if it is less than 85%, the electrode needs to be
adjusted or replaced.
B.3.2 Weigh (10.0 ± 0.1) g of the sample into a 100 mL beaker.
B.3.3 Add 60 mL of isopropanol aqueous solution into another 100 mL beaker;
put in the stirring rotor; insert the pH electrode; turn on the stirring; add sodium
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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