1、November 2014 English price group 5No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 23.040.80!%C%k“2320272www.din.de
2、DIN 28091-2Technical delivery conditions for gasket sheets Part 2: Requirements and testing for fibrebased gasket materials (FA),English translation of DIN 28091-2:2014-11Technische Lieferbedingungen fr Dichtungsplatten Teil 2: Anforderungen und Prfung fr Dichtungswerkstoffe auf Basis von Fasern (FA
3、),Englische bersetzung von DIN 28091-2:2014-11Spcifications techniques pour plaques isolantes Partie 2: Exigences et essais pour matriaux dtanchit base de fibres (FA),Traduction anglaise de DIN 28091-2:2014-11SupersedesDIN 280912:199509www.beuth.deDocument comprises 6 pagesDTranslation by DIN-Sprach
4、endienst. In case of doubt, the German-language original shall be considered authoritative. 02.16 DIN 28091-2:2014-11 2 A comma is used as the decimal marker. Contents Page Foreword . 3 1 Scope 4 2 Normative references 4 3 Requirements 4 4 Testing . 5 4.1 General 5 4.2 Cold compression set KSW, KSWk
5、5 4.3 Compression set at elevated temperature WSW/T, WSWk/T. 5 4.4 Determination of leak rate . 5 5 Material . 5 5.1 Main components 5 5.2 Material designation system . 6 5.3 Designation for ordering 6 DIN 28091-2:2014-11 3 Foreword This document (DIN 28091-2:2014) has been prepared by Working Commi
6、ttee NA 082-00-16 AA Flansche und ihre Verbindungen of the DIN-Normenausschuss Rohrleitungen und Dampfkesselanlagen (NARD) (DIN Standards Committee Piping and Boiler Plant). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. DIN and/
7、or DKE shall not be held responsible for identifying any or all such patent rights. DIN 28091 consists of the following parts under the general title Technical delivery conditions for gasket sheets: Part 1: General requirements for gasket materials Part 2: Requirements and testing for fibre-based ga
8、sket materials (FA) Part 3: Requirements and testing for PTFE-based gasket materials (TF) Part 4: Requirements and testing for expanded graphite-based gasket materials (GR) Amendments This standard differs from DIN 28091-2:1995-09 as follows: a) normative references have been updated; b) short-term
9、test values in accordance with DIN 28090-2 have been added; c) non-relevant properties (recovery, compressive creep strength, resistance to chemicals) have been deleted; d) the standard has been editorially revised. Previous editions DIN 28091-2: 1995-09 DIN 28091-2:2014-11 4 1 Scope This standard s
10、pecifies requirements and methods of testing for compressed fibre-based gasket materials (FA). This standard, in conjunction with DIN 28091-1, applies to gasket sheets based on compressed fibre materials (FA) and the gaskets produced from such materials. Gaskets produced using other methods can also
11、 be tested according to this standard. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the r
12、eferenced document (including any amendments) applies. DIN 28090-2, Static gaskets for flange connections Gaskets made from sheets Part 2: Special test procedures for quality assurance DIN 28091-1:2014-11, Technical delivery conditions for gasket sheets Part 1: General requirements for gasket materi
13、als DIN ISO 1629, Rubber and latices Nomenclature 3 Requirements Table 1 contains requirements for gasket sheets based on compressed fibre materials (FA). Table 1 Requirements Item No. Property Unit Requirements 3.1 Appearance of the surface The material shall be free of cracks, delamination, indent
14、ations, grooves or clusters. Its thickness shall not exceed the limit deviations given in Table 1 of DIN 28091-1:2014-11. Given the wide variety of possible defects, comparison with reference specimens need to be agreed upon. 3.2 Density as in DIN 28090-2 g/cm3To be specified by the supplier. Tolera
15、nces 5 % 3.3 Cold compression set KSWas in DIN 28090-2 (long-term test) % 4 to 20 3.4 Cold compression set KSWkas in DIN 28090-2 (short-term test) % To be specified by the supplier (optional) 3.5 Recovery at ambient temperature KRWas in DIN 28090-2 % To be specified by the supplier 3.6 Compression s
16、et at elevated temperature WSW/Tas in DIN 28090-2 (long-term test) % 30 3.7 Compression set at elevated temperature WSWk/Tas in DIN 28090-2 (short-term test) % To be specified by the supplier (optional) 3.8 Leak rate as in DIN 28090-2 mg/(s m) 2,0 0,1 DIN 28091-2:2014-11 5 4 Testing 4.1 General The
17、specimen sheet should be 2 mm thick. 4.2 Cold compression set KSW, KSWkChoose a preload that will result in a compressive stress of 1,0 MPa being reached. The main load FHKshall produce a compressive stress of 35 MPa (short-term test 50 MPa). 4.3 Compression set at elevated temperature WSW/T, WSWk/T
18、The test shall be carried out according to DIN 28090-2 at 200 C (long-term test) or respectively at 300 C (short-term test). The main load FHWshall produce a compressive stress of 50 MPa. NOTE The maximum testing temperature in particular does not allow conclusions to be drawn as to the continuous s
19、ervice temperature of a given gasket, which is normally well under 300 C. 4.4 Determination of leak rate For the determination of leak rate , see DIN 28090-2. 5 Material 5.1 Main components Compressed fibre gasket materials (FA) are composite materials made from elastomer binders or a mixture of ela
20、stomer binders which are reinforced by the inclusion of fibres, and fillers. NOTE: Usually, the material is based on a composition of the following (by mass): fibres: 5 to 50 % binder: 10 to 30 % fillers: 10 to 85 % Gasket materials in accordance with this standard are to be designated according to
21、5.2. The material designations indicate the fibre and binder components that have a decisive impact on the technical properties. Indication of the main fibre and binder components is optional. The order of the letters in the material designation indicates the mass of fibre(s), binder(s) and filler(s
22、) in decreasing percentage. DIN 28091-2:2014-11 6 5.2 Material designation system The designation is based on the letter symbol FA (for compressed fibres), followed by the symbols given in Table 2. Table 2 Symbols Type of fibre Symbol Type of binderaSymbol Type of filler Symbol Aramide A NBR 1 No fi
23、llers used O Glass G SBR 2 Steel St Carbon C NR 3 Nickel-chromium steel Cr Mineral M IIR 4 Nickel Ni Natural N Other Z Aluminium Al Other Z Other Z aSymbol as in DIN ISO 1629 EXAMPLE For structuring a material designation: FA A G 2 3 Cr According to Table 2, the symbols in this designation have the
24、following meaning: FA gasket material; A type of fibre (main component); G type of fibre (secondary component); 2 type of binder (main component); 3 type of binder (secondary component); Cr type of filler. NOTE The components used do not permit conclusions to be drawn as to the performance of gasket materials. 5.3 Designation for ordering EXAMPLE For structuring a material designation for ordering: Gasket sheets DIN 28091 Dimensions FA A G 2 3 Cr Name of manufacturer Type
