ISO 5794-1-2022 PDF

Full title and description

ISO 5794-1:2022 — Rubber compounding ingredients — Silica, precipitated, hydrated — Part 1: Non-rubber tests. This International Standard specifies methods of test for characterizing precipitated hydrated silica for use as a rubber compounding ingredient and includes the test formulation, mixing equipment and procedure and non‑rubber test methods used to assess silica intended for rubber compounding.

Abstract

This standard defines chemical and physical test methods to characterise precipitated hydrated silica used as a filler in rubber compounds, and provides the non‑rubber analytical procedures and requirements needed for quality control, specification and comparative evaluation. It also sets out the test formulation and mixing procedure used when silica is evaluated in a styrene‑butadiene rubber (SBR) formulation.

General information

• Status: Published.
• Publication date: 1 June 2022 (Edition 5, published June 2022).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 83.040.20 (Rubber compounding ingredients).
• Edition / version: Edition 5 (2022).
• Number of pages: 30 pages (published edition).

Scope

ISO 5794-1:2022 applies to precipitated hydrated silica used as an ingredient in rubber compounds and specifies non‑rubber test methods to determine its chemical composition and physical characteristics. The document also specifies the test formulation, mixing equipment and mixing procedure used when determining the physical properties of styrene‑butadiene rubber compounded with precipitated hydrated silica. The standard is intended to support specification, quality control and comparative evaluation of silica grades for rubber applications.

Key topics and requirements

• Defined non‑rubber analytical methods to characterise precipitated hydrated silica (chemical composition, moisture/volatile content, ash, insolubles, pH, etc.).
• Methods to determine physical parameters (specific surface area—BET, structure, particle characteristics and related measurements used to classify silica grades).
• Procedures for sample preparation and conditioning for testing (sampling, drying, etc.).
• Specification of the test formulation, mixing equipment and mixing procedure used when evaluating silica in SBR compounds (so that rubber evaluation results are comparable).
• Requirements and test record elements needed for quality control and supplier specification of precipitated silica for rubber compounding.

Typical use and users

Primary users include precipitated silica manufacturers, rubber compounders, tire and automotive suppliers, research & development laboratories, third‑party testing laboratories and quality control departments that specify, verify or compare silica grades for rubber applications. The standard is used to establish supplier specifications, QA/QC test programs and to produce comparable evaluation data when assessing filler performance in SBR-based mixes.

Related standards

ISO 5794 is a multipart series. Relevant related parts include ISO 5794-2 (Evaluation procedures in styrene‑butadiene rubber, edition 2014) and ISO 5794-3 (Evaluation procedures in a blend of solution S‑SBR and BR, edition 2011). These companion parts cover the rubber‑mix evaluation procedures referenced in ISO 5794-1. The standard is developed under ISO/TC 45/SC 3.

Keywords

precipitated hydrated silica; silica for rubber; rubber compounding ingredients; non‑rubber tests; BET specific surface area; SBR test mix; filler characterisation; quality control; ISO 5794.

FAQ

Q: What is this standard?

A: ISO 5794-1:2022 is an ISO International Standard that specifies non‑rubber test methods for characterising precipitated hydrated silica intended for use as a rubber compounding ingredient.

Q: What does it cover?

A: It covers analytical and physical test methods (chemical composition, moisture/ash/insolubles, specific surface area and other physical characteristics), sample preparation and the specified SBR test formulation and mixing procedure used when evaluating silica in rubber compounds.

Q: Who typically uses it?

A: Silica producers, rubber compound formulators (especially tyre and elastomer manufacturers), R&D and QC laboratories, and standards/specification writers who need consistent, comparable test data for silica grades used in rubber.

Q: Is it current or superseded?

A: ISO 5794-1:2022 is the current published edition (published June 2022) and supersedes the previous edition ISO 5794-1:2010.

Q: Is it part of a series?

A: Yes — ISO 5794 is a multipart series. Part 1 covers non‑rubber tests (this document); Part 2 and Part 3 specify evaluation procedures in rubber mixes (e.g., SBR and S‑SBR/BR formulations) used to determine silica performance in rubber compounds.

Q: What are the key keywords?

A: Precipitated hydrated silica; rubber compounding; filler characterisation; non‑rubber tests; BET surface area; SBR test formulation; quality control; ISO 5794.