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GB/T 36089-2018Acrylonitrile-butadiene rubber(NBR) (English PDF)

丙烯腈-丁二烯橡胶(NBR)

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

March 15, 2018

Implementation date

October 1, 2018

Scope

GB/T 36089-2018 is the English-translated version of 丙烯腈-丁二烯橡胶(NBR).

GB/T 36089-2018 is the Chinese national product standard for acrylonitrile-butadiene rubber (NBR), the nitrile rubber made from butadiene and acrylonitrile by low-temperature emulsion polymerization.

It covers three grades by bound acrylonitrile content: medium, medium-high and high.

The standard sets the appearance and technical indicators of the rubber and the test methods, with references to methods for Mooney viscosity, volatile matter, ash, bound acrylonitrile, vulcanization characteristics and the tensile properties and hardness of vulcanizates.

It also gives the inspection rules, with type and exit-factory inspection items, batches of no more than 100 t, sampling and acceptance, together with packaging, marking, transportation, storage and shelf life. It was issued on 15 March 2018 and has applied since 1 October 2018.

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Document preview — GB/T 36089-2018

National Standard of the People's Republic of China

ICS: 83.060
Classification: G 35

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword3
1 Scope4
2 Normative References4
3 Technical Requirements5
4 Test Methods6
5 Inspection Rules8
6 Packaging, Marking, Transportation and Storage9
7 Shelf Life9

1 Scope

This Standard specifies the technical requirements, test methods, inspection rules, product packaging, marking, transportation, storage and shelf life of acrylonitrile-butadiene rubber (NBR) [namely, nitrile rubber (NBR)].

This Standard is applicable to nitrile rubber, which takes butadiene and acrylonitrile as the monomer, and adopts low-temperature emulsion polymerization in production; this standard is applicable to three types of nitrile rubber, namely, intermediately bound acrylonitrile, intermediately and highly bound acrylonitrile, and highly bound acrylonitrile.

2 Normative References

The following documents are indispensable to the application of this Standard. In terms of references with a specified date, only versions with a specified date are applicable to this Standard. The latest version (including all the modifications) of references without a specified date is applicable to this Standard.

GB/T 528 Rubber, Vulcanized or Thermoplastic - Determination of Tensile Stress-strain Properties

GB/T 531.1 Rubber, Vulcanized or Thermoplastic - Determination of Indentation Hardness - Part 1. Duromerer Method (Shore Hardness)

GB/T 1232.1 Rubber, Unvulcanized - Determinations Using a Shearing-disc Viscometer - Part 1. Determination of Mooney Viscosity

GB/T 4498.1-2013 Rubber - Determination of Ash - Part 1. Muffle Furnace Method

GB/T 9869 Rubber - Measurement of Vulcanization Characteristics with the Oscillating Disc Curemeter

GB/T 15340 Rubber, Raw Natural and Raw Synthetic - Sampling and Further Preparative Procedures

GB/T 16584 Rubber - Measurement of Vulcanization Characteristics with Rotorless Curemeters

GB/T 19187 Sampling Procedures for Inspection of Raw Synthetic Rubber

GB/T 19188 Rubber, Raw Natural and Raw Synthetic - General Guidance on Storage

GB/T 24131-2009 Rubber, Raw - Determination of Volatile Matter Content

GB/T 24797.3 Film for Wrapping Rubber Bales - Part 3. Ethylene-propylene-diene Rubber (EPDM), Acrylonitrilebutadiene Rubber (NBR), Hydrogenerated Nitrile-butadiene Rubber (HNBR), Acrylic-ethylene Rubber (AEM) and Acrylic Rubber (AMC)

GB/T 34685-2017 Acrylonitrile-butadiene Rubber (NBR) - Evaluation Procedure

SH/T 1157.1 Rubber, Raw - Determination of Bound Acrylonitrile Content in Acrylonitrile-butadiene Rubber (NBR) - Part 1. Combustion (Dumas) Method

SH/T 1157.2-2015 Rubber, Raw - Determination of Bound Acrylonitrile Content in Acrylonitrile-butadiene Rubber (NBR) - Part 2. Kjeldahl Method

SH/T 1159-2010 Acrylonitrile-butadiene Rubber (NBR) - Determination of the Swelling Ratio

3 Technical Requirements

3.1 Appearance

The primary shape of nitrile rubber is block, with uniform colors and no foreign matters.

3.2 Technical Indicators

Please refer to Table 1 for the test items and technical indicators of nitrile rubber.

5 Inspection Rules

5.1 Inspection Items

5.1.1 Model inspection

In accordance with the technical requirements in Table 1, model inspection shall be conducted in trial production of new products; when there are significant changes in raw materials and technologies; when production is resumed after suspension; after a certain stipulated inspection cycle. In terms of model inspection items in Table 1, different inspection cycles and frequencies can be stipulated.

5.1.2 Exit-factory inspection

Volatile compounds, Mooney viscosity and compound acrylonitrile in Table 1 are exit-factory inspection items. Through the negotiation with users, other items in Table 1 can also be stipulated as exit-factory inspection items.

5.2 Group Rules and Sampling Plans

5.2.1 Group rules

Condensed and dried products based on a jar of evenly mixed rubber cement shall be considered as one batch. Products with uniform quality, and the same raw materials and technological conditions shall be considered as one batch. The mass of each batch shall not exceed 100 t.

5.2.2 Sampling plans

In exit-factory inspection, take samples in accordance with time frames. Samples that are taken by time frames shall be prepared in accordance with GB/T 15340. In arbitration test, conduct sampling and sample preparation in accordance with the stipulation in GB/T 19187.

5.3 Determination Rules

5.3.1 Exit-factory determination rules

Conduct inspection and acceptance check in accordance with the mixed laboratory sample stipulated in GB/T 19187. When any item does not conform to the technical requirements in Table 1, take the reserved sample and conduct re-inspection of the unqualified item. In accordance with the re-inspection result, determine the mass. […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 24131-2009 · SH/T 1157.1

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