1、UDC 62-762.444-036.71 .8: 661.22 : 620.22 DEUTSCHE NORM December 1984 Symbol used as in IS0 1629 O-rings for use in fluid power systems Materials and fields of application Hardness (IRHD) as in DIN 53 51 9 Part 1 or 2 (f5) Basic elastomer - DIN 3771 - Part 3 NBR Acrylonitrile butadiene rubber Fluidt
2、echnik; O-Ringe; Werkstoffe, Einsatzbereiche 70 1 Scope and field of application This standard specifies materials along with their hardness and provides information on the application of O-rings as covered in DIN 3771 Pari 1. FPM EPDM 2 Materials O-rings are made of elastomeric materials based on s
3、ynthetic rubbers as specified in table 1. Fluorocarbon rubber 85 Ethylene propylene diene rubber 70 Table 1 I NBR I Acrylonitrile butadiene rubber I 90 I I MVQ I Silicone rubber I 70 I I ACM I Polyacrylate rubber I 70 I 3 Field of application Table 2 specifies fields of application of O-rings made o
4、f the materials given in table 1 and their compatibility with a range of service fluids. Although these have been grouped, they may vary in their compositions. More details with regard to application and continuous service temperatures are to be agreed between the user and the manufacturer. Continue
5、d on pages 2 and 3. eulh Verlag GmbH, Berlin, has the exclusive right of sale for German Standards (DIN-Normen) 06.95 DIN 3771 Part 3 Eng/. Price group 5 Sales NO. 0105 Page 2 DIN 3771 Part 3 Table 2 Service fluids3) Other service fluids Fluids based on mineral oil Fire-resistant hydraulic fluids “C
6、 Maximum continuous temperature of service fluid. in OCP) - 1 O0 NBR 70 IRHD NBR 90 IRHD FPM 85 IRHD - -30 - -15 90 - 150 1 O0 - 150 - - 1 O0 60 60 1 O0 150 - - 150 1 O0 - 140 200 EPDM 70 IRHD - 40 130 130 - 200 MVQ 70 IRHD - 50 130 150 1 O0 O ACM 70 IRHD - 130 -15 130 130 130 Yhere the continuous s
7、ervice temperature has not been specified, o denotes that the elastomers of this group exhibit a differ- !nt behaviour towards all or particular service fluids. . denotes that the elastomer is not suitable for this group of service fluids. ) The materials specified characterize a particular type of
8、elastomer. From the basic elastomer, a number of mixtures may be prepared which exhibit similar basic characteristics but differ widely in their specific properties (e.g. tensile strength, elonga- tion at break, rebound resilience, compression set and resistance to low and high temperatures). ) The
9、information on service temperatures has been given for guidance only. It should be noted that if the upper temperature limit is exceeded, a shorter service life may be expected. On the other hand, it may be necessary to lower this limit when using aggressive service fluids. The fact that elastomeric
10、 material, when exposed to low temperatures, usually tends to excessive hardening without embrittlement, does not allow conclusions to be drawn on the service temperature since this is a function of other factors and should be agreed between the user and the manufacturer. There are special materials
11、 for use at lower temperatures. ) Although the behaviour of a mixture towards service fluids is mainly a function of the basic elastomer, the nature and the quantity of the other mixture components, such as plasticizers, fillers, curing agents and antioxidants are of relevance. Large quantities of e
12、xtractable plasticizers, for example, may change the swelling properties of the elastomer so that it swells substantially less or even shrinks when used in mineral oils or solvents. Therefore, the data given is for general information only and intended to facilitate the selection of seal material fo
13、r particular applications. In case of doubt, the manufacturer should be contacted. DIN 3771 Part 3 Page 3 Standards and other documents referred to DIN 3771 Part 1 DIN 24 320 DIN 51 524 Part 1 DIN 51 525 DIN 51 600 DIN 51 601 DIN 51 603 Part 1 DIN 51 603 Part 2 DIN 53 519 Part 1 DIN 53 519 Part 2 IS
14、0 1629 : 1994 VDMA-finheifsblatt (VDMA Code of practice) 24 317 guidelines *) O-rings for use in fluid power systems; dimensions to IS0 3601-1 Type HFAE fire-resistant hydraulic fluids; requirements Type HL hydraulic oils; minimum requirements Type HLP hydraulic oils; minimum requirements Leaded pet
15、rol; minimum requirements*) Diesel fuel; minimum requirements*) EL type fuel oils; minimum requirements Types L, T and M fuel oils; requirements and testing Determination of indentation hardness (IRHD) of soft rubber using standard specimens Testing of elastomers; determination of indentation hardne
16、ss (IRHD) of soft rubber; microhardness testing of small specimens Rubber and latices; nomenclature*) Fluid power systems; hydraulics; fire-resistant hydraulic fluids, Other relevant standards DIN 3771 Part 2 DIN 3771 Part 4 DIN 50 049 DIN 53 479 DIN 53 504 DIN 53 507 DIN 53 517 DIN 53 521 DIN 53 53
17、8 series DIN 53 670 Part 1 O-rings for use in fluid power systems; testing and marking O-rings for use in fluid power systems; surface imperfections Inspection documents for the delivery of metallic products Determination of density of plastics and elastomers Determination of tensile stressistrain p
18、roperties of rubber Testing of rubber and elastomers; Determination of tear strength of rubber using trouser test piece Determination of compression set of rubber at constant strain Determination of the behaviour of rubber when exposed to fluid and vapours Standard reference elastomers Testing of ru
19、bber in the form of standard test mixes; apparatus and methods Explanatory notes In respect of the material characteristics which vary from one manufacturer to the other, only basic properties and fields of appli- cation, but no methods of test have been specified. Data on material characteristics i
20、s available from the manufacturer. The relevant standards for testing elastomers are DIN 50 049, DIN 53 479, DIN 53 504, DIN 53 507, DIN 53 517, DIN 53 521, DIN 53 538 series and DIN 53 670 Part 1. International Patent Classification F 16 J 15-14 *) Obtainable from Beufh Verlag GmbH, D-10772 Berlin. *) Withdrawn. *) Superseded by DIN EN 590. *) At present at the stage of draft.
