Standard Test Method for
Rubber Chemicals—Diphenyl Guanidine (DPG) and Di-tolyl-guanidine (DOTG) Assay1
This standard is issued under the fixed designation D 5054; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of the last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method describes the determination of the assay of
diphenyl guanidine (DPG) and di-o-tolyl-guanidine (DOTG).
It is based on a visual titration of DPG or DOTG with
hydrochloric acid (HCl).
1.2 The assay is determined as a mass percent.
1.3 The values stated in SI units are to be regarded as the
standard.
1.4 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
2.1 ASTM Standards:
D 1193 Specification for Reagent Water2
D 4483 Practice for Determining Precision for Test Method
Standards in the Rubber and Carbon Black Industries3
3. Summary of Test Method
3.1 DPG or DOTG is dissolved in methanol and titrated
with HCl solution using bromophenol blue indicator.
4. Significance and Use
4.1 DPG and DOTG are used for rubber and latex vulcanization acceleration. The amount of DPG or DOTG may be of
importance in predicting performance in rubber compounds
and for raw material purchase and control.
4.2 This test method may be used as a quality control tool
and for research and development work.
5. Interferences
5.1 Alkaline contaminants that are titratable with HCl interfere with the results.
6. Apparatus
6.1 Erlenmeyer Flask, 200-cm3
6.2 Graduated Cylinder, 25-cm3
Click below to download Astm D 5054 – 90 (Reapproved 2000) pdf free
