SIST EN ISO 18473-3:2019 PDF

Name: SIST EN ISO 18473-3:2019 — Functional pigments and extenders for special application - Part 3: Fumed silica for silicone rubber application (ISO 18473-3:2018)
SKU: SIST EN ISO 18473-3:2019
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Functional pigments and extenders for special application - Part 3: Fumed silica for silicone rubber application (ISO 18473-3:2018)

Название (английский):

SIST EN ISO 18473-3:2019

Functional pigments and extenders for special application - Part 3: Fumed silica for silicone rubber application (ISO 18473-3:2018)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 12
Дата публикации:: 9 августа 2019 г.
ICS:: 87.060.10
Технический комитет:: PIP - Pigments and extenders

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Срок поставки:2 раб. дн. (перевод)

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Описание (английский):

ISO 18473-3:2018 specifies requirements and corresponding methods of test for fumed silica in powder form for silicone rubber application. This document is applicable to untreated and surface treated fumed silica.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

EN ISO 18473-3:2019 (ISO 18473-3:2018) defines requirements and test methods for fumed silica in powder form intended for silicone rubber applications. Adopted by CEN, this part of the ISO 18473 series covers both untreated (hydrophilic) and surface-treated (hydrophobic) fumed silica used as functional pigments and extenders. The standard helps manufacturers, suppliers and test laboratories ensure consistent quality and fitness for use in silicone rubber formulations.

Key topics and technical requirements

Classification: fumed silica is classified as hydrophilic or hydrophobic depending on dispersibility in water.

Designation: normally designated by specific surface area (m2/g) measured by the BET method (ISO 9277); typical designation values include 150, 200, 300, 380 m2/g (subject to agreement).

Essential parameters and test methods:

Specific surface area: designated value ±10% (ISO 9277).
pH of aqueous suspension: ≥ 3.8 (ISO 787-9).
Loss on drying (105 °C): hydrophilic ≤ 2.0%, hydrophobic ≤ 1.0% (ISO 787-2).
Residue on 45 µm sieve: ≤ 150 mg/kg (ISO 787-18).
Metal impurities (Fe, Al, Ti): limits given (e.g., Fe ≤ 11 mg/kg) using ISO 3262-20:2000 methods.
Carbon content: hydrophilic ≤ 0.2%, hydrophobic ≥ 0.3% (ISO 3262-20:2000).
Loss on ignition: ≤ 2.5% (ISO 3262-1).

Conditional requirement: tamped density reported per ISO 787-11 if agreed between parties.

Sampling, marking and reporting:

Sampling per ISO 15528; packing must be labelled with manufacturer, product name/type, net weight, batch number and a “keep away from rain” mark.
Test reports must identify the product, reference ISO 18473-3:2018 and list methods/results.

Practical applications

Primary use: reinforcing filler in silicone rubbers - RTV, HTV, HCR and LSR - to improve strength, rheology and optical properties.

Secondary uses: specialist formulations in paints, coatings and plastics where nano-structured fumed silica properties are required.

The standard ensures material consistency for formulators aiming for predictable curing, mechanical performance and transparency in silicone-based products.

Related standards

ISO 9277 (BET specific surface area), ISO 787 series (general test methods), ISO 3262 series (extender test methods), ISO 15528 (sampling), ISO 18451-1 (terminology).

Keywords: EN ISO 18473-3:2019, ISO 18473-3, fumed silica, silicone rubber, specific surface area, BET, hydrophilic, hydrophobic, test methods.

SIST EN ISO 18473-3:2019 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications

Who should use this standard

Related standards

Технические детали

ISO 18473-3:2018

Functional pigments and extenders for special application — Part 3: Fumed silica for silicone rubber applicat…

ISO 3262-20:2000

Extenders for paints — Specifications and methods of test — Part 20: Fumed silica

BS EN ISO 18473-2:2018

Functional pigments and extenders for special applications. Nanoscale titanium dioxide for sunscreen applicat…

ISO 9277:1995

Determination of the specific surface area of solids by gas adsorption using the BET method

SIST EN ISO 787-9:2019

General methods of test for pigments and extenders - Part 9: Determination of pH value of an aqueous suspensi…

SIST EN ISO 787-2:2021

General methods of test for pigments and extenders - Part 2: Determination of matter volatile at 105 °C (ISO…

SIST EN ISO 787-18:1997

General methods of test for pigments and extenders - Part 18: Determination of residue on sieve - Mechanical…

BS EN ISO 3262-11:2024

Extenders. Specifications and methods of test. Natural talc, in lamellar form, containing carbonates.