GB/T 3778-2021Carbon black for use in rubber products (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

This document replaces GB/T 3778-2011 "Carbon Black for Rubber". Compared with GB/T 3778-2011, except for structural adjustments and editorial changes In addition, the main technical changes are as follows.

a) Changed the scope of application (see Chapter 1, Chapter 1 of the 2011 edition);

b) The element "Terms and Definitions" has been added (see Chapter 3);

c) Deleted the "series classification" (see 3.2 in the 2011 edition);

d) The characteristic index of iodine absorption value of some varieties has been changed (see Table 2, Table 2 of the 2011 edition);

e) The external surface area characteristic index "106~120" of N120 is changed to "113~127" (see Table 2, 2011 edition of Table 2);

f) The oil absorption characteristic index "43" of N990 is changed to "38" (see Table 2, Table 2 of the 2011 edition);

g) The characteristic indexes of three varieties of "N750, granular spray carbon black, and oil-rich natural gas semi-reinforcing carbon black" have been added (see Table 2);

h) The note in Table 2 has been changed, and relevant information about the iodine absorption value test method has been added (see Table 2, Table 2 in the 2011 edition);

i) Added "Quality Judgment for 300% Constant Tensile Stress" (see 5.4);

j) Changed the pH value of spray carbon black from "8.0~10.0" to "7.0~10.0" [see 5.8d), 4.5 in the 2011 edition];

k) Deleted the specific provisions of the "300% constant tensile stress" test method (see 5.2 in the 2011 edition), and only retained the test method (see 6.11);

l) Added "reference carbon black IRC5 The previous versions of this document and the documents replaced are as follows.

---First published in 1983 as GB 3778-1983, first revision in 1989, second revision in 1994, third time in 2003 Revision, the fourth revision in 2011;

---This is the fifth revision.

Carbon black for rubber Warning---The personnel using this document should have practical experience in formal laboratory work. This document does not indicate all possible safety issues question. The user is responsible for taking appropriate safety and health measures and ensuring compliance with the conditions stipulated by relevant national laws and regulations.

1 Scope

This document specifies the variety naming, characteristic requirements, test methods, inspection and determination rules, sampling, packaging, marking, and transportation of carbon black for rubber. And storage.

This document is applicable to rubber carbon black manufacturers, tires and other rubber industries, and independent quality inspection agencies.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 528 Determination of tensile stress and strain properties of vulcanized rubber or thermoplastic rubber

GB/T 3780.1 Carbon black Part 1: Test method for iodine absorption value

GB/T 3780.2 Carbon black Part 2: Determination of oil absorption value

GB/T 3780.4 Carbon Black Part 4: Determination of Oil Absorption Value of Compressed Samples

GB/T 3780.5 Carbon black Part 5: Determination of specific surface area CTAB method

GB/T 3780.6 Carbon black Part 6: Determination of color strength

GB/T 3780.7 Carbon Black Part 7: Determination of pH

GB/T 3780.8 Carbon black Part 8: Determination of heating loss

GB/T 3780.10 Carbon Black Part 10: Determination of Ash

GB/T 3780.12 Carbon Black Part 12: Inspection of Impurities

GB/T 3780.18 Carbon black Part 18: Identification method in natural rubber (NR)

GB/T 3780.21 Carbon black Part 21: Determination of residue on sieve water washing method

GB/T 7767 Carbon black term

GB/T 10722 Determination of total surface area and external surface area of carbon black Nitrogen adsorption method

GB/T 14853.1 Granulated carbon black for rubber Part 1: Determination of pouring density

GB/T 14853.2 Granulated carbon black for rubber Part 2: Determination of fine powder content and particle abrasion

3 Terms and definitions

The following terms and definitions defined in GB/T 7767 apply to this document.