Significance and Use

Several test methods for carbon black require the reduction in sample size or the blending of the test sample to reduce the variation of the measured characteristic. Other factors being equal, larger samples will tend to be more representative of the total supply. This practice provides procedures for reducing the large sample obtained from the bag and bulk sampling practices to a convenient size for conducting a number of tests to describe the material and measure its quality in such a manner that the smaller portion is most likely to be a representation of the bulk sample. Failure to follow the procedures in this practice could result in providing a nonrepresentative sample to be used in subsequent testing. Individual test methods provide for minimum amounts of material to be tested.

Test Method A, Reduction of Sample Size , is typically used to obtain an aliquot from a large sample, splitting a black into two or more equal portions, or reducing a blended black from Test Method B to a specified sample size. The final sample is always smaller than the original sample and would not be considered to be a well blended sample.

Test Method B, Blending of Carbon Black , is typically used to prepare a homogeneous sample. The homogeneous sample may be used for several tests (see Note 3) or may be reduced in size by Test Method A. The final sample size is the same as the original.

When a sample is to be blended and reduced, the sample should be blended (Test Method B) before reduction (Test Method A). The blending and reduction must be done before the sample is dried (Test Method C).

1. Scope

1.1 This practice describes the procedure for blending of pelleted carbon black, the procedure for the reduction of gross samples of pelleted carbon black to the appropriate size for testing and the preparation of the sample for testing. These techniques are intended to minimize variations in measured characteristics between test samples. Standard terminology relating to carbon black samples is found in Terminology D 3053 .

1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D412 Test Methods for Vulcanized Rubber and Thermoplastic Elastomers--Tension

D1506 Test Methods for Carbon Black--Ash Content

D1508 Test Method for Carbon Black, Pelleted Fines and Attrition

D1509 Test Methods for Carbon Black--Heating Loss

D1510 Test Method for Carbon Black--Iodine Adsorption Number

D1511 Test Method for Carbon Black--Pellet Size Distribution

D1512 Test Methods for Carbon Black--pH Value

D1513 Test Method for Carbon Black, Pelleted--Pour Density

D1514 Test Method for Carbon Black--Sieve Residue

D1618 Test Method for Carbon Black Extractables--Transmittance of Toluene Extract

D1619 Test Methods for Carbon Black--Sulfur Content

D1765 Classification System for Carbon Blacks Used in Rubber Products

D1799 Practice for Carbon Black--Sampling Packaged Shipments

D1900 Practice for Carbon Black--Sampling Bulk Shipments

D2414 Test Method for Carbon Black--Oil Absorption Number (OAN)

D3053 Terminology Relating to Carbon Black

D3191 Test Methods for Carbon Black in SBR (Styrene-Butadiene Rubber)--Recipe and Evaluation Procedures

D3192 Test Methods for Carbon Black Evaluation in NR (Natural Rubber)

D3265 Test Method for Carbon Black--Tint Strength

D3493 Test Method for Carbon Black--Oil Absorption Number of Compressed Sample (COAN)

D5230 Test Method for Carbon Black--Automated Individual Pellet Hardness

D6556 Test Method for Carbon Black--Total and External Surface Area by Nitrogen Adsorption

Keywords

carbon black; pelleted carbon black; reducing and blending carbon black; Blending materials process; Carbon black--pelleted; Carbon black sampling; Drying conditions/processing; Gross samples; Reduction;

ICS Code

ICS Number Code 71.060.10 (Chemical elements)

DOI: 10.1520/D5817-03AR08

ASTM International is a member of CrossRef.

ASTM D5817