ISO 5435:2017 pdf download

ISO 5435:2017 pdf download.Rubber compounding ingredients — Carbon black — Determination of tinting strength
1 Scope
This document specifies a method for the determination of the tinting strength of carbon black relative to an industry tint reference black.
The method is based on the use of five different commercial instruments. Other instruments can be used if the test results for the standard reference blacks are within the control limits given in ASTM D4821.
NOTE The Densichron reflectometer and the Meeco Colormaster are no longer commercially available, but the procedures have been included for the benefit of those who still use these instruments.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1126, Rubber compounding ingredients — Carbon black — Determination of loss on heating
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Principle
An industry tint reference black (ITRB or ITRB-2) is mixed with zinc oxide and a liquid plasticizer.
The paste obtained is mulled and homogenized, then spread as a layer of regular thickness. Its light reflectance is measured with a reflectometer sensitive to different shades of grey.
A test sample is mixed and its light reflectance measured in the same manner and, from the two light reflectance values, the relative tinting strength of the sample is determined.
5 Reagents
Use only reagents of recognized analytical grade and only distilled water or water of equivalent purity.
NOTE Users of this document are strongly encouraged to use only the materials mentioned below. Different types of oil or zinc oxide can lead to issues during preparation and drawdown of the pastes and can provide erroneous test results.
8.2.3.2.1 Film drawdown method
8.2.3.2.1.1 Clean the glass plate (8.2.3.1.3) with a tissue to remove any dust particles and film.
Using a clean palette knife (6.4), place a portion of one of the mulled pastes with 100 % calibration tint value (see 8.1.10) at the top edge of the glass plate and smear it almost to the bottom edge. Using the film applicator (8.2.3.1.2), draw the paste down to the bottom edge in about 2 s to 3 s.
8.2.3.2.1.2 Set the range switch to 2 and operate with no filter in the reflection head.
Use a 4,76 mm aperture if head No. 3882A is used. Place the reflectometer head on the paste drawdown. Adjust the meter to read a reflectance value of 80 for at least three readings, all taken at 75 mm or more from the top of the drawdown. If the results are variable, gather up the paste and make another drawdown.
8.2.3.2.1.3 Make a duplicate drawdown of the duplicate paste as in 8.2.3.2.1.1.
Without altering the settings, take three readings from the duplicate paste. If the results are variable, gather up the paste and make another drawdown. These pastes are acceptable if a reading of 80 ± 0,5 is obtained from the duplicate paste. NOTE It is beneficial to have the two drawdowns side by side.