EN 13938-2:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Explosives for civil uses - Propellants and rocket propellants - Part 2: Determination of resistance to electrostatic energyExplosifs a usage civil - Poudres propulsives et propergols pour fusées - Partie 2 : Détermination de la résistance a l'énergie électrostatiqueExplosivstoffe für zivile Zwecke - Treibladungspulver und Raketentreibstoffe - Teil 2: Bestimmung der Widerstandsfähigkeit gegen elektrostatische EnergieTa slovenski standard je istoveten z:EN 13938-2:2004SIST EN 13938-2:2005en71.100.30ICS:SLOVENSKI
STANDARDSIST EN 13938-2:200501-februar-2005

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13938-2October 2004ICS 71.100.30 English versionExplosives for civil uses - Propellants and rocket propellants -Part 2: Determination of resistance to electrostatic energyExplosif à usage civil - Poudre propulsive et propergol pourfusée - Partie 2 : Détermination de la résistance à l'énergieélectrostatiqueExplosivstoffe für zivile Zwecke - Treibladungspulver undRaketentreibstoffe - Teil 2: Bestimmung derWiderstandsfähigkeit gegen elektrostatische EnergieThis European Standard was approved by CEN on 23 August 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13938-2:2004: E

Range of applicability of the test method.8 Annex B (normative)
Sieving method.9 Annex C (normative)
Calibrating procedure for electrostatic discharge generator.10 C.1 General.10 C.2 Device to be tested.10 C.3 Apparatus.10 C.4 Procedure.11 C.4.1 Voltage and capacitor calibration.11 C.4.2 Discharge circuit calibration.11 C.4.3 Additional calibration in case of an additional series resistance.12 C.5 Requirements for the generator.13 Annex D (normative)
Screening method for electrostatic discharge generator.14 D.1 Material.14 D.2 Procedure.14 Annex ZA (informative)
Clauses of this European Standard addressing essential requirements or other provisions of EU Directives.15

Part 1: Requirements. EN13938-3
Part 3: Determination of deflagration to detonation transition. EN13938-4
Part 4: Determination of burning rate under ambient conditions. EN13938-5
Part 5: Solid rocket propellants. Determination of voids and fissures EN13938-6
Part 6: Solid rocket propellants. Guide for the determination of integrity of inhibitor coatings. EN13938-7
Part 7: Determination of properties of black powder. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

NOTE: If the mass fraction of particles smaller than 1 mm size is less than 5 % the propellant is considered to be insensitive to electrostatic energy and this test is not performed. 2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies EN 13857-1:2003, Explosives for civil uses — Part 1: Terminology. EN ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories (ISO/IEC 17025:1999). ISO 565, Test sieves; Metal wire cloth, perforated metal plate and electroformed sheet - Nominal sizes of openings
3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 13857-1:2003 and the following apply. 3.1 reaction occurrence of report, crackling, sparkling and/or flame 3.2 partial reaction change of colour, opening of the cell or heat traces at the surface of the cell 4 Apparatus
4.1 Cells and covers (see Figure 1).
The cell consists of:
− a plastics disc, e.g. polyvinylchloride, thickness (3,0 ± 0,1) mm, diameter (32 ± 1) mm, with a centred drilled hole, diameter (6,3 ± 0,1) mm; − a copper disc, thickness approximately 1 mm, diameter (19 ± 1) mm, which forms the cell base.
The plastics disc is fixed to the copper disc by means of a bead of adhesive around the outer edge.
The cover consists of a copper disc, thickness approximately 0,1 mm, diameter (16 ± 1) mm which is fixed to the upper part of the plastics disc by means of a double-sided adhesive tape.

The electrostatic energy supply consists of: − generator capable of applying a 10 kV continuous voltage; − three capacitors: capacitance 0,001 µF, 0,01 µF and 0,1 µF, each with a relative tolerance of ± 10 %; − coaxial cable, length 1,85 m, characteristic impedance 50 Ω, capacitance 100 pF/m, attenuation 95 × 10-3 dB/m at 200 MHz; − two brass electrodes. and, if necessary: − selector switch; − change-over relay (in vacuum). 5 Preparation of test sample
Take a 100 g sample and sieve it according to the sieving method given in annex
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