ISO 17278:2020 PDF

Rubber, raw natural — Determination of the gel content of technically specified rubber (TSR)

Open preview (PDF)

Title (English):

ISO 17278:2020

Rubber, raw natural — Determination of the gel content of technically specified rubber (TSR)

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 7
Publication date:: April 30, 2020
Edition:: ISO IS 17278 edition 2 version 1
ICS:: 83.040.10

Delivery type:

Full version25 €Read online 24h10 €Read online 72h15 €

Document language:

enru

Delivery time:Immediate download

Price:25 €

Description (English):

This document specifies a method for the determination of gel content for technically specified rubbers (TSR).

Technical details

Technical committee: ISO/TC 45/SC 3 - Raw materials (including latex) for use in the rubber industry
SKU: ISO 17278:2020

Abstract

Overview

ISO 17278:2020 specifies a laboratory test method for measuring the gel content of technically specified rubber (TSR) - raw natural rubber processed from Hevea brasiliensis. The method determines the insoluble (gel) fraction by dissolving TSR in toluene, separating the insoluble material by centrifugation, drying and weighing the residue. Results are reported as a percentage gel content (rounded to one decimal place).

Key topics and requirements

Principle: dissolve a defined mass of TSR in toluene, allow extraction, centrifuge to separate insoluble gel, remove solvent, dry precipitate and calculate gel content as a percentage of the original sample mass.
Reagents: analytical-grade toluene (primary solvent) and acetone (for rinsing precipitate).
Apparatus & accuracy:
- Laboratory centrifuge: 14 000 r/min (recommended) or minimum 8 000 r/min with extended time.
- Screw-cap centrifuge tubes (≥30 cm3) able to withstand >110 °C.
- Balance accurate to ±0.1 mg and weighing containers to ±1 mg.
- Oven capable of 110 °C ±10 °C and a desiccator.
Test conditions & procedure:
- Sample ratio: typically 0.1 g TSR per 30 cm3 toluene.
- Extraction: stand 16–20 h at (25 ± 2) °C in the dark.
- Centrifugation: 14 000 r/min for 2 h (or 8 000 r/min for 6 h).
- Drying: precipitate dried at 110 °C for 1 h; repeat weighings until mass change

Related standards

Other ISO standards

Overview

Key topics and requirements

Principle: dissolve a defined mass of TSR in toluene, allow extraction, centrifuge to separate insoluble gel, remove solvent, dry precipitate and calculate gel content as a percentage of the original sample mass.
Reagents: analytical-grade toluene (primary solvent) and acetone (for rinsing precipitate).
Apparatus & accuracy:
- Laboratory centrifuge: 14 000 r/min (recommended) or minimum 8 000 r/min with extended time.
- Screw-cap centrifuge tubes (≥30 cm3) able to withstand >110 °C.
- Balance accurate to ±0.1 mg and weighing containers to ±1 mg.
- Oven capable of 110 °C ±10 °C and a desiccator.
Test conditions & procedure:
- Sample ratio: typically 0.1 g TSR per 30 cm3 toluene.
- Extraction: stand 16–20 h at (25 ± 2) °C in the dark.
- Centrifugation: 14 000 r/min for 2 h (or 8 000 r/min for 6 h).
- Drying: precipitate dried at 110 °C for 1 h; repeat weighings until mass change

ISO 17278:2020 PDF

Technical details

Abstract

Overview

Key topics and requirements

Related standards

Abstract

Overview

Key topics and requirements

Related standards

Systems and software engineering — Software life cycle processes

Asset management — Vocabulary, overview and principles

Asset management — Asset management system — Requirements

Information technology — Radio frequency identification device conformance test methods — Part 2: Test method…

Information technology — Multimedia framework (MPEG-21) — Part 22: User Description

Milk — Determination of the lactoperoxidase activity — Photometric method (Reference method)

Carbonaceous materials for the production of aluminium — Cold and tepid ramming pastes — Expansion/shrinkage…

Agricultural machinery — Safety — Part 13: Large rotary mowers