увод
ИСО (Међународна организација за стандардизацију) је глобални савез националних тела за стандардизацију (Тела чланица ИСО). Развој међународних стандарда се обично спроводи преко ИСО техничких комитета. Свака институција чланица заинтересована за предмет за који је основан технички комитет има право да буде заступљена у тој комисији. Међународне владине и невладине организације које су у вези са ИСО такође су укључене у овај посао. ИСО блиско сарађује са Међународном електротехничком комисијом (ИЕЦ) о свим питањима електричне стандардизације.

Процедуре које се користе за израду овог документа и оне које се користе за даље одржавање описане су у Делу 1 ИСО/ИЕЦ директиве. Нарочито, треба обратити пажњу на различите критеријуме одобрења који су потребни за различите типове ИСО докумената. This document has been drafted in accordance with the editing rules of ISO/IEC Directive Part 2 (види исо.орг/дирецтивес).

Please note that certain elements of this document may be subject to patent rights. ИСО није одговоран за идентификацију било ког или свих таквих патената. Details of any patent rights identified during the preparation of the document will be found in the introduction and/or in the list of patent claims received by ISO (see iso.org/patents).

ИСО 18473-3-2018 “Functional pigments and fillers for special purposes – Парт 3: fumed silica for silicone rubber applications”

Any trade names used in this document are provided for the convenience of the user and do not constitute an endorsement.

Voluntary, related standards and conformity assessment related ISO specific and express the meaning of terminology as well as in relevant ISO technical barriers to trade (ТБТ) adhere to the principle of the world trade organization (WTO) information, please refer to the following URL:iso.org/iso/foreword.html.

This document was prepared by the ISO/TC 256 Technical Committee on Pigments, Dyes and Fillers.

A list of all parts in the ISO ISO 18473 series can be found on the ISO website.

ИСО 18473-3-2018 “Functional pigments and fillers for special purposes – Парт 3: fumed silica for silicone rubber applications”

увести
Fumed silica (fumed silica) is a pure amorphous white inorganic powder with a high specific surface area, a nanoscale primary particle size resulting in a “stable/non-destructive” aggregate structure, and a relatively high (in silica products) surface silanol group concentration. The properties of fumed silica can be chemically modified by reacting with these silanol groups. Commercially available fumed silica can be divided into two categories: hydrophilic fumed silica and hydrophobic fumed silica. Due to the above characteristics, it is widely used as an important ingredient in many industries such as rubber, paint and plastics industries. The main application of fumed silica is in the silicone rubber industry.

Silicone rubber has excellent properties, such as low temperature flexibility, good weather resistance, electrical insulation, dielectric resistance, physiological inertia, low surface tension and surface energy, to meet the important needs of the market. Међутим, due to the low strength of cured polydimethylsiloxanes (PDMS) (< 0.4МПа), these unique properties cannot be effectively demonstrated, because cured polydimethylsiloxane (PDMS) is the main component of silicone; Стога, in addition to additives and curing agents, silicone rubber usually contains reinforcing fillers. As one of the functional fillers, fumed silica is widely used in room temperature vulcanized silicone rubber (RTV), high temperature vulcanized silicone rubber (HTV) or high consistency vulcanized silicone rubber (HCR) and liquid silicone rubber (LSR), which plays an important role in the strength, rheology and transparency properties of silicone polymers. The test methods for dispersed fumed silica aggregate size and silanol density are still under development, both of which have significant effects on the above properties of silicone rubber.

ИСО 18473-3-2018 “Functional pigments and fillers for special purposes – Парт 3: fumed silica for silicone rubber applications”

1 Домет
This document specifies the requirements and corresponding test methods for fumed silica in powder form for silicone rubber applications. This document is intended for both untreated and surface treated fumed silica.

2 Normative references
The following files are referenced in text in a manner that constitutes part or all of the requirements of this document. За датиране референце, примењује се само наведена верзија. For undated references, a new version of the reference (укључујући све ревизије) примењује.

ИСО 787-2, Опште методе испитивања за пигменте и пунила – Парт 2: Determination of volatiles at 105°C

ИСО 787-9, Common test methods for pigments and fillers – Парт 9: Determination of the pH value of water suspensions

ИСО 787-11, Опште методе испитивања за пигменте и пунила – Парт 11: Determination of compaction volume and apparent density after compaction

ИСО 787-18, Опште методе испитивања за пигменте и пунила – Парт 18: Determination of residues on screens – mechanical flushing procedure

ИСО 18473-3-2018 “Functional pigments and fillers for special purposes – Парт 3: fumed silica for silicone rubber applications”

ИСО 3262-1, paint extenders – Спецификације и методе испитивања – Парт 1: Introduction and general test methods

ИСО 3262-20:2000, fillers for paints. Спецификације и методе испитивања. Парт 20: fumed silica

ИСО 9277, Determination of specific surface area of solids by gas adsorption – BET method

ИСО 15528, Paints, varnishes and raw materials for paints and varnishes – Sampling

ИСО 18451-1, pigments, dyes and fillers – terminology – Парт 1: General terminology

3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 18451-1 and the following articles apply.

ИСО 18473-3-2018 “Functional pigments and fillers for special purposes – Парт 3: fumed silica for silicone rubber applications”

3.1 Fumed silica

Amorphous silica produced by high temperature flame hydrolysis of silicon halide

Белешка 1: It can also undergo further surface treatment.

Јаван је само одељак са стандардним информацијама. Да бисте видели цео садржај, морате купити стандард преко званичних канала.