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GB/T 5577-2008 English PDF (GBT5577-2008)

GB/T 5577-2008 English PDF (GBT5577-2008)

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GB/T 5577-2008: Codification of types for synthetic rubbers

This Standard specifies the principles and formats to formulate synthetic rubber designations. This Standard is applicable to synthetic rubber. This Standard is not applicable to latex.
GB/T 5577-2008
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 83.060
G 34
Replacing GB 5577-1985
Codification of types for synthetic rubbers
ISSUED ON: JUNE 19, 2008
IMPLEMENTED ON: DECEMBER 01, 2008
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 Principles for regulation of synthetic rubber designations ... 5
4 Format for synthetic rubber designation ... 6
Annex A (informative) Main characteristics of synthetic rubber ... 8
Annex B (informative) Some domestic synthetic rubbers and their designations ... 11
Foreword
This Standard replaces GB 5577-1985 ?€?Codification of types for synthetic rubbers?€?.
Compared with GB 5577-1985, the main changes in this Standard are as
follows:
- modified the standard name as ?€?Codification of types for synthetic rubbers?€?; - added the standard foreword;
- revised the principles for rubber designation;
- no more unified regulations on the main character numbers and digits of the designation, so as to fully meet the needs of enterprise technology development;
- added format requirements for synthetic rubber designation;
- deleted naming procedures;
- modified Annex A ?€?Digital regulations of main characteristics?€? to
?€?Information of main features of synthetic rubber?€? and modified main
characteristics of the rubber types such as NBR, EPDM, EPM, IIR, and
SBS;
- according to the current domestic production status, modified Annex B "Some synthetic rubbers produced in China and their designations";
- drafted in accordance with the rules given in GB/T 1.1-2009.
Annex A and Annex B of this Standard are informative.
This Standard was proposed by China Petrochemical Corporation.
This Standard shall be under the jurisdiction of Technical subcommittee on synthetic rubber of National Technical Committee on rubber and rubber
products of Standardization Administration of China (SAC/TC 35/SC 6).
The drafting organization of this Standard: China National Petroleum
Corporation Lanzhou Chemical Research Center.
The participating organizations of this Standard: Dushanzi Petrochemical Company of China National Petroleum Corporation, China National Petroleum Corporation Lanzhou Petrochemical Branch.
Codification of types for synthetic rubbers
1 Scope
This Standard specifies the principles and formats to formulate synthetic rubber designations.
This Standard is applicable to synthetic rubber.
This Standard is not applicable to latex.
2 Normative references
The provisions in following documents become the provisions of this Standard through reference in this Standard. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Standard, however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/T 5576-1997, Rubbers and lattices - Nomenclature (idt ISO 1629:1995) 3 Principles for regulation of synthetic rubber
designations
The expression of synthetic rubber designation shall be concise. It is generally composed of rubber variety code and characteristic information. Additional information can be added if necessary.
3.1 Synthetic rubber variety code
Synthetic rubber variety codes shall comply with the provisions of GB/T 5576- 1997. The code of synthetic rubber and other synthetic material modified products shall be composed of the variety code of synthetic rubber and the variety code of other synthetic materials. Each material variety code is separated by the symbol "/". For liquid rubber, powder rubber and rubber of other shapes, the appearance shapes can be indicated in the additional
information.
3.2 Rubber characteristic information
Rubber characteristic information shall be composed of information that can characterize the main characteristics of raw rubber. It may include: structural content, relative molecular mass, combined monomer content, raw rubber
Mooney viscosity, melt index, solution viscosity, polymerization temperature, polymerization catalyst system, filling condition, antioxidant type. Refer to Annex A for various synthetic rubber characteristics information. Characteristic information is generally expressed in Arabic numerals.
3.3 Additional rubber information
If the characteristic information is not yet able to clearly distinguish the rubber product varieties, it can add some additional information as appropriate, such as processing performance, use, color, appearance shape. The additional information can be expressed in numbers or in the form of English letters or Chinese Pinyin prefix.
4 Format for synthetic rubber designation
The designation of synthetic rubber is generally composed of 2~3 character- groups.
The first character-group: rubber variety code information group, in
accordance with the provisions of GB/T 5576-1997.
The second character-group: rubber characteristic information group. If digits are used to represent characteristic information, according to the number of characteristic information to be listed, it shall be composed of 2~4 Arabic numerals. One digit can be used to represent one characteristic, or two digits can be used to represent one characteristic.
The third character-group: rubber additional information group. The
additional information and characteristic information can be connected with a short "-".
The format for synthetic rubber designation is as follows:
Annex A
(informative)
Main characteristics of synthetic rubber
Table A.1 lists some of the main characteristics of synthetic rubber that can be selected. Users can also increase or decrease the use according to actual conditions.
Table A.1 -- Reference table for main characteristics information of
synthetic rubber
Rubber code Rubber name Main characteristics information
SBR Styrene-butadiene rubber (i.e. styrene butadiene rubber)
Polymerization temperature, filling
information, rosin acid soap emulsifier and
so on. Same as the series specified by the
International Synthetic Rubber Producers
Association (IISRP).
Usually: SBR1000 series represents hot
poly rubber; SBR1500 series represents
cold poly rubber; SBR1600 series
represents carbon-filled black rubber;
SBR17700 series represents oil-filled
rubber; SBR1800 series represents oil-
filled carbon black masterbatch.
S-SBR
Solution polymerized styrene-
butadiene rubber (i.e. instant
polystyrene butadiene rubber)
Combined styrene content, vinyl content,
raw Mooney viscosity, oil-filled
information, etc..
PSBR Vinylpyridine-styrene-butadiene rubber (i.e. styrene butadiene rubber) Combined styrene content, raw Mooney
viscosity, etc.
SBS Styrene-butadiene block copolymer Structure type, block ratio of styrene to butadiene, oil-filled information, etc.. SEBS Hydrogenated styrene-butadiene block copolymer
Structure type, block ratio of styrene to
butadiene, unsaturation, etc..
BR Butadiene rubber
Cis-1,4 structure content, raw rubber
Mooney viscosity, filling information,
nickel-based catalysis, etc.
Normally: 90-high cis, 65-medium cis, 35-
low cis
CR Neoprene rubber (i.e. neoprene)
Adjustment form, crystallization speed,
raw rubber Mooney viscosity or rotational
viscosity, etc.
Usually:

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