GB/T 3780.10-2017Carbon black -- Part 10: Determination of ash (English PDF)

Foreword

GB/T 3780 Carbon Black can be divided into the following parts.

--- Part 1. Test Method for Iodine Adsorption Number;

--- Part 2. Determination of Dibutyl Phthalate Absorption Number;

--- Part 4. Determination of Oil Absorption Number for Compressed Sample;

--- Part 5. Determination of Specific Surface Area - CTAB Test Method;

--- Part 6. Determination of Tinting Strength;

--- Part 7. Determination of pH Value;

--- Part 8. Determination of Heating Loss;

--- Part 10. Determination of Ash;

--- Part 12. Inspection of Impurity Material;

--- Part 14. Determination of Sulfur Content;

--- Part 15. Determination of Light Transmittance of Toluene Extract;

--- Part 17. Indirect Determination of Particle Size - Reflectance Method;

--- Part 18. Standard Test Methods for Evaluation in Natural Rubber (NR);

--- Part 21. Determination of Sieve Residue - Water Flushing Method;

--- Part 22. Calculation of Process Indexes from an Analysis of Process Control

Data;

--- Part 23. Sampling and Testing of Carbon Black Fugitive Emissions or Other

Environmental Particulate;

--- Part 24. Determination of Void Volume.

This Part belongs to Part 10 of GB/T 3780.

This Part was drafted as per the rules specified in GB/T 1.1-2009.

This Part replaced GB/T 3780.10-2009 Carbon Black – Part 10. Determination of Ash;

compared with GB/T 3780.10-2009, this Part has the major technical changes as

follows.

--- Add "after taking out the crucible, cooling it on a dry and clean porcelain plate

beside the high temperature furnace for 3 minutes"; add the operability (see 6.1);

--- Add "cover the lid of crucible, transfer to a dry and clean porcelain plate beside

the high temperature furnace; open the lid of the crucible"; prevent the sample

loss due to the air flow during the transferring period (see 6.3);

--- Add "6.4 and 6.5", so that add the operability and accuracy (see 6.4 and 6.5).

This Part adopts the re-drafting method to modify and use ISO 1125.2015. For the

sake of comparison, a checklist for the clauses of this Part and ISO 1125.2015 are

listed in the informative Appendix A.

Compared with ISO 1125.2015, this Part has more adjustments in structure. The

technical differences and causes between this Part and ISO 1125.2015 are as follows.

--- Add the content that this Standard is applicable to the acetylene black and color

black (see Clause 1);

--- Delete the reference standard of ISO 1125.2015; meanwhile, quote GB/T 3778,

GB/T 7044, GB/T 3782, GB/T 8170, which has no correspondence with ISO

1 Scope

This Part of GB/T 3780 specifies the determination of ash in carbon black.

This Part is applicable to the rubber carbon black, acetylene black, and color black.

2 Normative References

The following documents are essential to the application of this document. For the

dated documents, only the versions with the dates indicated are applicable to this

document; for the undated documents, only the latest version (including all the

amendments) are applicable to this document.

GB/T 3778 Carbon Black for Use in Rubber Products

GB/T 3782 Acetylene Black

GB/T 7044 Color Carbon Black

GB/T 8170 Rules of Rounding off for Numerical Values & Expression and

Judgement of Limiting Values

3 Principle

Accurately take the dry specimen into the porcelain crucible; place the crucible into a

high temperature furnace for burning till all carbonaceous materials are oxidized; then

take out crucible, cool off into the desiccator, and weigh it; then calculate the ash

content.

burning period, open the high temperature furnace door for about 0.5cm; so that the

air enters into the high temperature furnace and facilitate the combustion of the sample.

Other burning temperatures may be used with the agreement of both parties.

7 Test Data Processing

The ash content of the carbon black shall be recorded by mass fraction of residue after

burning of the sample, w; it shall be calculated as per Formula (1).

Where.

m0 – the mass value of empty crucible before sample-weighing, in g;

m1 – the mass value of crucible and specimen before burning, in g;

m2 – the mass value of crucible and residue after burning, in g.

The calculation results shall be expressed by two figures after the decimal points; if

there are multiple measurement results, take the average value; then round-off the

value as per the report requirements or provisions of GB/T 3778, GB/T 3782, GB/T

7044 or GB/T 8170.

8 Precision