EN 3847:2019

Aerospace series - Paints and varnishes - Determination of sedimentation rating

This document specifies the method of test for evaluating the tendency of paints and varnishes towards sedimentation of their pigments.
The procedure describes a method where the pigmented paint is allowed to settle at a specified temperature and for a specified time.
The procedure is not applicable to products which possess a pot life inferior to the specified measuring time.

Luft- und Raumfahrt - Lacke und Anstrichstoffe - Bestimmung der Verlandungszahl

Série aérospatiale - Peinture et vernis - Détermination de l'indice de sédimentation

Le présent document spécifie la méthode d’essai permettant d’évaluer la tendance des peintures et vernis à la sédimentation de leurs pigments.
La procédure décrit une méthode selon laquelle la peinture pigmentée est laissée au repos à une température définie pendant une durée spécifique.
Cette procédure n’est pas applicable aux produits qui ont un délai d’utilisation inférieur à la durée de mesure spécifiée.

Aeronavtika - Barve in laki - Določevanje vrednosti sedimentacije

Ta standard določa preskusno metodo za ocenjevanje tendence barv in lakov za sedimentacijo pigmentov. Ta postopek opisuje metodo, pri kateri se lahko pigmentirano barvo pusti, da se ustali pri določeni temperaturi za določen čas. Ta postopek se ne uporablja za izdelke, pri katerih je rok uporabnosti krajši od določenega merilnega časa.

General Information

• Status: Published
• Publication Date: 17-Sep-2019
• Withdrawal Date: 30-Mar-2020
• ICS: 49.040 - Coatings and related processes used in aerospace industry
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 4/S 6 - Surface treatments for Metallic
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 18-Sep-2019
• Completion Date: 18-Sep-2019
• Ref Project: SIST EN 3847:2019 - Aerospace series - Paints and varnishes - Determination of sedimentation rating

Overview

EN 3847:2019 - "Aerospace series - Paints and varnishes - Determination of sedimentation rating" is a CEN standard that specifies a laboratory method to evaluate the tendency of pigmented aerospace paints and varnishes to undergo pigment sedimentation. The test measures the volume of supernatant fluid after a defined settling period and reports a sedimentation rating (volume in ml over 4 h). The procedure is intended for quality control, formulation assessment and acceptance testing of aerospace coatings, excluding products with a pot life shorter than the test duration.

Key Topics and Requirements

• Scope: Measures pigment sedimentation tendency of pigmented paints and varnishes for aerospace use; not applicable when pot life < measurement time.
• Principle: Allow a prepared paint mixture to settle at a specified temperature for a specified time and measure the clear supernatant volume.
• Apparatus:
  • Equipment per ISO 2431 (flow-time/viscosity apparatus);
  • 100 ml measuring cylinder (distance between 0 ml and 100 ml ≈ 18 cm);
  • Stopper/cork and temperature-controlled enclosure at (23 ± 2) °C.
• Sample preparation:
  • Thorough homogenisation of base, activator and thinners; allow 30 min closed settling to remove entrained air and regain thixotropy;
  • Take 200 ml of each component, mix base/activator per manufacturer ratio;
  • Adjust viscosity to required flow time using ISO 2431 flow cups and appropriate thinners.
• Test procedure:
  • Immediately after preparation, decant paint into the measuring cylinder to the 70 ml mark;
  • Close with stopper and stand upright 4 h at 23 ± 2 °C;
  • Measure the volume V (ml) of supernatant above the sediment.
• Results:
  • Report V (ml) and sedimentation rating I = V (expressed in ml over 4 h).
• Test report content must include identification of the paint, batch numbers, mixing ratios, thinner references, flow time and cup number, test results, deviations and test date.

Applications and Users

• Practical for aerospace paint formulators, quality control laboratories, coating manufacturers, procurement/specification engineers and certification bodies.
• Use cases:
  • R&D assessment of pigment stability and formulation adjustments;
  • Incoming quality inspection and batch verification;
  • Comparative evaluation of additives, thickeners or dispersants to reduce sedimentation;
  • Supporting product specifications and supplier acceptance criteria.

Related Standards

• ISO 2431 - Paints and varnishes: determination of flow time by use of flow cups (referenced for viscosity/flow-time control).
• EN 3847 is part of aerospace coatings standardization and should be applied alongside relevant product and performance standards for aerospace paints.

Keywords: EN 3847:2019, sedimentation rating, paints and varnishes, aerospace coatings, pigment sedimentation, ISO 2431, measuring cylinder, flow time, quality control.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2019
Aeronavtika - Barve in laki - Določevanje vrednosti sedimentacije
Aerospace series - Paints and varnishes - Determination of sedimentation rating
Luft- und Raumfahrt - Lacke und Anstrichstoffe - Bestimmung der Verlandungszahl
Série aérospatiale - Peinture et vernis - Détermination de l'indice de sédimentation
Ta slovenski standard je istoveten z: EN 3847:2019
ICS:
49.040 Prevleke in z njimi povezani Coatings and related
postopki, ki se uporabljajo v processes used in aerospace
letalski in vesoljski industriji industry
87.040 Barve in laki Paints and varnishes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 3847
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2019
EUROPÄISCHE NORM
ICS 49.040
English Version
Aerospace series - Paints and varnishes - Determination of
sedimentation rating
Série aérospatiale - Peinture et vernis - Détermination Luft- und Raumfahrt - Lacke und Anstrichstoffe -
de l'indice de sédimentation Bestimmung der Verlandungszahl
This European Standard was approved by CEN on 14 July 2019.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3847:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle . 4
5 Apparatus. 4
6 Preparation of the test material . 4
7 Procedure . 5
8 Expression of results. 5
9 Test report . 5

European foreword
This document (EN 3847:2019) has been prepared by the Aerospace and Defence Industries Association
of Europe - Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Standard has
received the approval of the National Associations and the Official Servi
...