PPS 2058
Project Plan 2026
Rubber, raw natural — Determination of plasticity retention index (PRI)
Adopted by the Council as a standard on 10/08/2026
Sector:
Chemicals and Petroleum
Project Method:
Adoption with modification
Project Type:
Update
International Classification for Standards (ICS)
| Code | Classification |
|---|---|
| 83.040.10 | Latex and raw rubber |
Adopted Standard
| Standards / Amendment / Corrigendum | |
|---|---|
| 1 | ISO 2930:2024 |
Replaces
| Will Replace |
|---|
| PS 2058-2010 |
Scope
This document specifies a method to determine the plasticity retention index (PRI) of raw natural rubber.
The PRI is a measure of the resistance of raw natural rubber to thermal oxidation. A high resistance to thermal oxidation is shown as a high value of the index. PRI is not an absolute value and cannot give an absolute classification of plasticity number of different natural rubber after oxidation