Technical Principles | O-Rings and Static Seals O-Rings and Static Seals Technical Principles ISC O-Rings 550 Static Sealing 552 Dynamic Sealing 558 Further Technical Notes 565 Produkte Products 572 Design Types 573 © Freudenberg Simrit GmbH & Co.
Technical Principles | O-Rings and Static Seals ISC O-Rings Simrit ISC O-Rings are among the most demanded sealing components worldwide. With the ISC (International Specified Certified) seal of approval, Simrit proves consistency in terms of material attributes and compound formulas throughout the entire ISC O-Ring lifecycle. Requirements ■ ■ ■ ■ ■ ■ 550 High resistance vis-à-vis a wide variety of applied media Superior temperature resistance High resistance to pressure, e.g.
Technical Principles | O-Rings and Static Seals Features ■ ■ ■ ■ ■ ■ State-of-the-art materials expertise and variety ISC certification with dependable material mixture ratios Friction-reducing special coatings for fitting and maintenance-friendly procedures High protection against twisting Very extensive offering of standard dimensions Large design variety (O-rings, X-rings, D-rings, Rectangular rings, Oval rings).
Technical Principles | O-Rings and Static Seals Static Sealing The sealing effect of the ISC O-Ring is attributable to its axial or radial change of shape of its cross-section once installed. This change of shape is achieved by a corresponding designing of the installation space. The resultant reactive force provides the seal with the necessary contact pressure, which is additionally supported by pressure from the medium.
Technical Principles | O-Rings and Static Seals Installation in a rectangular groove with radial change of shape For the sealing of mortices, sockets, bolts or covers with centering shoulders, ISC O-Rings are usually installed as in the figure below. The cross-section of the ISC O-Ring (d2) is radially deformed upon installation. Whether the mounting groove is cut into the inner or outer part depends on the processing and installation possibilities.
Technical Principles | O-Rings and Static Seals Groove dimensions for an ISC O-Ring fitting in a rectangular groove with radial deformation Groove dimensions can be found in the following table.
Technical Principles | O-Rings and Static Seals Groove dimensions for an ISC O-Ring fitting in a rectangular groove with axial deformation Ø d1 d2 Tbl.
Technical Principles | O-Rings and Static Seals ISC O-Ring groove dimensions for installation in a triangular groove ISC O-Ring groove dimensions for installation in a triangular groove Ø d1 Ø d1 d2 d2 Groove dimensions Groove dimensions d2 T d2 T 2,62 3,80 ±0,10 12,50 17,13 ±0,50 2,65 3,80 ±0,11 13,00 19,10 ±0,52 3,00 4,30 ±0,12 13,50 18,50 ±0,50 3,50 5,10 ±0,14 14,00 19,18 ±0,50 3,53 5,10 ±0,14 14,50 19,87 ±0,50 3,55 5,10 ±0,14 15,00 22,10 ±0,60 4,00 5,80 ±0,16 4,50
Technical Principles | O-Rings and Static Seals M ±0,05 m ±0,05 R2 Detail X Detail X M m R max 16 T 25 ±1 ° R1 R max 16 Fig. 6 Installation in a trapezoidal groove with axial deformation The trapezoidal groove is used when the ISC O-Ring is to be held firmly in the housing groove. Due to the difficult manufacture of the groove, it is recommended to only use this application with a ring thickness of 3,5 mm or thicker.
Technical Principles | O-Rings and Static Seals Dynamic Sealing With dynamic sealing, a distinction must be made between hydraulics and pneumatics in ISC O-Ring applications. Due to the friction resistance, the deformation is minimised compared with static seals. Sufficient lubrication from the medium to be sealed with hydraulics, or by means of an aerosol lubricator with pneumatics, reduces losses due to friction and wear.
Technical Principles | O-Rings and Static Seals ISC O-Ring groove dimensions for fitting in hydraulics with axial/oscillating movements Ød1 d2 r1 15° 15° t g r2 r1 Z Z b1+0,2 t g r2 b1+0,2 h9 f7 H8 Ød3 Ød9 Ød4 H8 H9 f7 Ød5 Ød10 Ød6 d2 Groove depth t Groove width b1 Chamfer 15° Z 1,50 1,3 ±0,03 1,8 1,2 1,78 1,5 ±0,04 2,2 1,5 1,80 1,5 ±0,04 2,2 1,6 2,00 1,7 ±0,04 2,4 1,7 2,40 2,1 ±0,05 2,8 1,7 2,50 2,2 ±0,05 2,9 1,7 2,62 2,3 ±0,05 3,0 1,8 2,65 2,3 ±0,05 3,1 1,9
Technical Principles | O-Rings and Static Seals Hydraulics – rotating motion The sealing of a rotating shaft should only be attempted with an ISC O-Ring if there is no room for the installation of an effective seal and the operating conditions are not severe. Circumferential speeds of up to approx. 4 m/s can be handled with non-pressurised media, insofar as no greater demands are made with regard to the service life and sealing effect. A Simmerring is in any case more dependable.
Technical Principles | O-Rings and Static Seals possibilities, the deformation of the cross-section is kept low. The deformation is minimised to between 2% and 6%, depending on the ring thickness. The dimensions for the length of the facet are minimum values.
Technical Principles | O-Rings and Static Seals Pneumatics – axial movement – without ISC O-Ring compression under pressure (float-mounted fitting) ISC O-Ring groove dimensions for fitting in pneumatics - axial movement - without compression under pressure Ø d1 The float-mounted fitting is especially suitable for the sealing of pistons. The cross-section of the ISC O-Ring is not deformed by this.
Technical Principles | O-Rings and Static Seals Gap widths for stationary machine components When using back-up rings made of PTFE, gap widths of up to 0,3 mm can be bridged at operating pressures of up to 40 MPa. mm 0,3 Correct 0,25 p OR 0,2 Gap width g 0,15 Back-up ring necessary OR 72 S ho 90 re S ho A re A 0,1 0,05 63 100 160 210 250 bar Incorrect Diagram 1 p Fig.
Technical Principles | O-Rings and Static Seals Surfaces Groove Application Ra Rz Axial (planar) 3,2 12,5 Radial (cylindrical) 1,6 6,3 Under pulsating pressure 1,6 6,3 With SR (back-up ring) 1,6 6,3 Without SR (back-up ring) 0,8 3,2 Under non-pulsating pressure 1,6 6,3 Under pulsating pressure 0,8 3,2 Under non-pulsating pressure Static Groove base and flanks Dynamic Static Rod and cylinder wall Dynamic Lead-in chamfer 0,4 1,6 3,2 12,5 Tbl. 12 5° max.
Technical Principles | O-Rings and Static Seals Further Technical Notes Fitting The entire system should be cleansed of dirt and processing residue prior to fitting of the ISC O-Rings. ISC O-Rings should not be pulled over sharp edges, crooked shafts, threads, grooves, etc. It is recommendable to cover the sharp transitions when mounting in order to avoid damage. The ISC O-Ring may not be positioned distorted – twisted – in the mounting groove. A brief elastic expansion is permissible when mounting.
Technical Principles | O-Rings and Static Seals Tolerances Ø d1 ISC O-Ring are manufactured to extremely close tolerance levels, as specified in DIN 3771. The stated values are only valid for ISC O-Rings made of the standard material 72 NBR 872. With Simrit materials having a different material base or a different hardness, deviations from the nominal dimensions could arise as a result of shrinkage. These, however, are normally so small that they have no effect on the intended ISC O-Ring function.
Technical Principles | O-Rings and Static Seals Cross-section compression 20% 10% 516 /3 AU 140 R NB 6 15 90 AU 80 120 /3 516 781 NBR 872 BR N 72 156 BR N 88 81 BR 7 80 N 872 72 NBR 100 80 60 40 20 2 1 Diagram 4 88 90 Compression force at the O-ring circumference N per cm 160 4 3 5 6 7 9 8 10 Ring thickness d2 [mm] Necessary force of pressure at 10% and 20% cross-sectional shape change under pressure A conical test mandrel (taper 1:10 DIN 254) is used to measure the ring-inside d
Technical Principles | O-Rings and Static Seals Grade attributes according to DIN 3771 ISC O-Rings are supplied in two different design implementation qualities to cover all requirement situations that arise with practical applications. ■ Grade attribute N (Normal quality), quality limit range AQL 1.0 or by agreement. These ISC O-Rings fulfil very high quality demands and are suitable for all conventional application situations. It is irrelevant whether these involve static or dynamic seals.
Technical Principles | O-Rings and Static Seals Tool list according to DIN 3771 9,00 ±0,17 B ±0,17 B ±0,17 B d2 10,60 ±0,18 B 11,20 ±0,18 B1) 11,80 ±0,19 B 12,50 ±0,19 B1) 13,20 ±0,19 B ±0,15 7,00 ±0,13 5,30 1,80 ±0,13 B1) 14,00 ±0,19 B1) B1) 2,00 ±0,13 B1) 15,00 ±0,20 B1) B1) 2,24 ±0,13 B 16,00 ±0,20 B B B ±0,13 B1) 17,00 ±0,21 2,80 ±0,14 B1) 18,00 ±0,21 B1) B1) 1) B1) 3,15 ±0,14 B1) 19,00 ±0,22 B 3,55 ±0,14 B1) 20,00 ±0,22 B1) B1)
Technical Principles | O-Rings and Static Seals ±0,36 95,00 ±0,81 B1) B 38,70 ±0,37 B B1) 97,50 ±0,83 B1) B1) Permis. dev.
Technical Principles | O-Rings and Static Seals d2 1) ±0,15 ±0,13 5,30 7,00 ±0,10 3,55 ±0,15 7,00 ±0,09 ±0,13 5,30 2,65 ±0,10 3,55 B Permis. dev. ±0,08 ±0,09 2,65 B d1 1,80 ±0,08 Permis. dev. 1,80 d1 d2 236,00 ±1,79 600,00 ±4,05 B 243,00 ±1,83 B B 615,00 ±4,13 B 250,00 ±1,88 B B 630,00 ±4,22 B 258,00 ±1,93 B B 650,00 ±4,34 B 265,00 ±1,98 B B 670,00 ±4,46 B 272,00 ±2,02 B B1) 1) 280,00 ±2,08 B B Tbl.
Products I ISC O-Rings and Static Seals Products ISC O-Ring 573 SStatic Seals matikkomponenten Back-Up Ring SRA Back-Up Ring SRI Spiral Back-Up Ring SPR Profiles for Static Applications Usit-Rings U, UA, USF Plug & Seal Plug Connections Merkel Cover Seal PU 82 Merkel Cover Seal PU 83 Merkel Grafiflex® Cover Seal Merkel Cover Lid Seal Type 6324 Sealing Cover GA, GSA Merkel Grafiflex® 6501 Merkel Endless Packing Rings 572 575 576 577 578 584 586 588 590 592 594 595 597 598 © Freudenberg Simrit GmbH & Co
Products I ISC O-Rings and Static Seals ISC O-Ring Product description ISC O-Rings are endless round sealing rings of circular cross section. They are mainly used to seal stationary machine components – static case – against fluid and gaseous media. In certain conditions, they can also be used as a dynamic sealing component for axial, rotating and oscillating movement.
Products I ISC O-Rings and Static Seals Design notes The dimensions of an ISC O-Ring are defined by inside dia. d1 and ring thickness d2. These dimensions represent the parameters for the ISC O-Ring. The code for an ISC O-Ring in standard material with inside dia. 20,2 mm and a ring thickness 3 mm is as follows: ISC O-Ring 20,2–3 72 NBR 872 Ø d1 d2 Drawing with dimensions Please observe our general design notes.
Products I ISC O-Rings and Static Seals Back-Up Ring SRA Material Material Code Unfilled PTFE PTFE00/F52800 or PTFE 177509 Operating conditions Back-Up Ring SRA Product advantages ■ ■ ■ Enlargement of the operating conditions of O-rings High material and product quality Wide selection of standard dimensions.
Products I ISC O-Rings and Static Seals Back-Up Ring SRI Material Material Code Unfilled PTFE PTFE00/F52800 or PTFE 177509 Operating conditions Back-Up Ring SRI ■ ■ Temperature All fluids used in hydraulics –70 … +260 °C* (only valid for PTFE component) * according to the O-ring material used Fitting & installation Product advantages ■ Media Enlargement of the operating conditions of O-rings High material and product quality Wide selection of standard dimensions.
Products I ISC O-Rings and Static Seals Spiral Back-Up Ring SPR Material Material Code Unfilled PTFE PTFE00/F52800 or PTFE 177509 Operating conditions Spiral Back-Up Ring SPR Media Temperature All fluids used in hydraulics –70 … +260 °C* (only valid for PTFE component) * according to the O-ring material used Product description Fitting & installation Spiral-shaped split bearing component with rectangular cross section. The surface finish requirements correspond to the values stipulated.
Products I ISC O-Rings and Static Seals Profiles for Static Applications Product overview ■ ■ ■ ■ ■ Profiles Hat Seals X Profiles Other special profiles Cords Cord Cord rings Hoses Hoses Hose rings.
Products I ISC O-Rings and Static Seals Material Besides the common materials with shorter delivery times, numerous special materials are also offered. These feature outstanding quality and durability. In the following overview, suitable materials can be selected according to their requirements.
Products I ISC O-Rings and Static Seals * Material Colour Operating temperature range 72 FKM 588 Black –10 °C … +200 °C 60 FVMQ 143026 Beige –80 °C … +175 °C 50 VMQ 570 Beige –40 °C … +200 °C 50 VMQ 114721 Yellow transparent –40 °C … +180 °C 58 VMQ 518 Red brown –40 °C … +200 °C 60 VMQ 114722 Yellow transparent –40 °C … +180 °C 70 VMQ 114723 Yellow transparent –40 °C … +180 °C 78 VMQ 526 Red –40 °C … +200 °C Special material on enquiry Design notes Tolerances All profiles, cord
Products I ISC O-Rings and Static Seals X-Profiles X-Profiles are used for sealing rods, cylinders and housings. The lower compression required as a result of the four lip sealing profile makes them favourable to round profiles and results in cost advantages during installation. In addition, X-Profiles can easily be used in a rectangular groove thanks to their contour. The decisive advantage of the X-Profile is that the risk of tilting and twisting is minimised due to the larger bearing surface.
Products I ISC O-Rings and Static Seals 13 8 8 32 15 20 13 15 Profile 2028 Profile 2130 Profile 2295 Profile 2584 7 11, 4 85 24 10 11 7,5 9 Profile 2766 Profile 2817 Profile 2956 Profile 2976 14,5 10 8 16 16 12 20 16 Profile 3009 Profile 3225 Profile 3058 5,4 10 20 Profile 3261 11 16 15,3 12 40 20 Profile 3387 Profile 3274 Profile 20116 12 6 Profile 20121 9 18 30 13 14,2 14 Profile 20124 582 Profile 20128 Profile 20141 Profile 20162 © Freudenberg Simri
Products I ISC O-Rings and Static Seals 13 5,6 55 ,4 42 45° 6 16 72° 28 Profile 20163 Profile 20189 Profile 20197 Profile 20211 Cord Hose rings The endless, extruded cord with O-ring profile serves as base material for cord rings, among others. These are used, for example, for the sealing of larger flanges or tank lids. Hose rings are rings punched from the hose and produced as hose by the metre. Hose rings made from precision hoses have absolute sharp inside and outside edges.
Products I ISC O-Rings and Static Seals Usit-Rings U, UA, USF Material Metal ring Steel SPCC Steel SPCC-1B Stainless steel (SUS 304) Sealing bead NBR rubber 72 NBR 99041 FKM rubber 75 FKM 99104 Other materials are available on enquiry from special production.
Products I ISC O-Rings and Static Seals Design notes Installation Rmax ≤15 µm Ra ≤3 µm Flat surfaces Surface Tolerances on finished parts DM S X d2 d1 Y dM Tolerance DM dM s ≤28 +0,15/–0,10 +0,10/–0,20 1,0 +0,08/–0,15 28 – 50 +0,20/–0,10 +0,10/–0,30 1,5 +0,13/–0,20 >50 +0,25/–0,10 +0,10/–0,40 2,0 +0,13/–0,20 3,0 +0,20/–0,25 3,5 +0,20/–0,30 © Freudenberg Simrit GmbH & Co.
Products I ISC O-Rings and Static Seals Plug & Seal Plug Connections ■ ■ ■ ■ ■ Compensation of middle offset Large tolerances in installation permissible Lower logistical complexity Integration of multiple functions into one component Low total costs. Application ■ ■ Plug & Seal Plug Connections ■ ■ ■ Product description Plug & Seal Plug Connections are pipe sections with a rubberised outer surface with sealing beads and stop dampers.
Products I ISC O-Rings and Static Seals Operating conditions max. 10 bar Operating pressure Higher pressures on enquiry.
Products I ISC O-Rings and Static Seals Merkel Cover Seal PU 82 Material TPU profile ring Material Code Polyurethane 95 AU V142/94 AU 925 Operating conditions Material 95 V142/94 AU 925 Temperature range in °C Merkel Cover Seal PU 82 Hydraulic oils HL, HLP Product description Single-piece, double-acting compact seal made from TPU for static sealing, inner sealing.
Products I ISC O-Rings and Static Seals Design notes Please observe our general design notes. Tolerance recommendation For pressures up to 60 MPa Nominal Ø d Borehole Shaft ≤800 H7 f7 >800 +0,0 +0,1 –0,05 –0,15 Fitting & installation Careful fitting is a prerequisite for the correct function of the seal. Mode of operation O-ring with PTFE back-up ring at 40 MPa operating pressure Cover Seal at 40 MPa operating pressure © Freudenberg Simrit GmbH & Co.
Products I ISC O-Rings and Static Seals Merkel Cover Seal PU 83 Material TPU profile ring Material Code Polyurethane 95 AU V142/94 AU 925 Operating conditions Material 95 V142/94 AU 925 Temperature range in °C Hydraulic oils HL, HLP Merkel Cover Seal PU 83 Product description Single-piece, double-acting Merkel compact seal made from low temperature polyurethane for static sealing, outer sealing.
Products I ISC O-Rings and Static Seals Design notes Please observe our general design notes. Tolerance recommendation For pressures up to 60 MPa Nominal Ø D Borehole Shaft ≤800 H7 f7 >800 +0,0 +0,1 –0,05 –0,15 Fitting & installation Careful fitting is a prerequisite for the correct function of the seal. Mode of operation O-ring with PTFE back-up ring at 40 MPa operating pressure Cover Seal at 40 MPa operating pressure © Freudenberg Simrit GmbH & Co.
Products I ISC O-Rings and Static Seals Merkel Grafiflex®-Cover Seal Product description Merkel Grafiflex cover seals are supplied as prepressed rings and are proven in self-sealing covers, e.g. in large valves and in high-pressure water preheaters. Product advantages Merkel Grafiflex stays elastic even with continually varying temperature and pressure up to 200 N/mm2 surface pressure. It correctly bridges gap widths on large, self-sealing covers up 0,3 mm.
Products I ISC O-Rings and Static Seals Media Hot water, feed water, steam, heat transfer oil, hydro-carbons and many other media. Exceptions: strongly oxidising media. 6581 B s Ø D 6523 6522 6521 6501 B s Ø D s s ØD B 350 20 0,8 350 >20 1,2 >350 20 0,8 >350 25 1,2 >350 >25 1,5 © Freudenberg Simrit GmbH & Co. KG | Technical Manual 2007 S (centr.
Products I ISC O-Rings and Static Seals Merkel Cover Lid Seal Type 6324 Product description Product advantages The Merkel Cover Lid Seal Type 6324 consists of a concentric hose braid and an optional elastomer core. ■ ■ ■ The elastomer core guarantees a constant sealing force over the entire service life. This is ideal for static cover seals with a high number of open/close cycles. The outer braid provides good wear protection and protects against attacks by chemicals.
Products I ISC O-Rings and Static Seals Sealing Cover GA, GSA Flash permissible on outer metal surface H H Ø D Ø D Sealing Cover GA Sealing Cover GSA Sealing Cover GA – Top view Sealing Cover GA – Bottom view Product description Product advantages ■ ■ GA (normal design, rubber outside): sealing cover with vulcanised metal inserts made of sheet steel GSA (special design, rubber/steel outside): sealing cover with vulcanised metal inserts made of sheet steel with metal seat (H8).
Products I ISC O-Rings and Static Seals Application Sealing cover for the static sealing of boreholes in housings with press fitting e.g. shaft pass through walls in gearbox housings. Material Acrylonitrile-butadiene rubber Designation 75 NBR 99004 Colour Black Hardness approx. 75 Shore A Metal insert unalloyed steel DIN EN 10139 (DIN 1624) Sealing covers made of other materials and in other dimensions available on enquiry.
Products I ISC O-Rings and Static Seals Merkel Grafiflex® 6501 Product description Merkel Grafiflex is characterised by the highest level of chemical resistance and temperature resistance as well as an excellent sealing effect and persistent elasticity. Regardless of temperature cycle, there is no cold flow, shrinkage or ageing of the material. Merkel Grafiflex meets the purity requirements for seals in nuclear power station valves (content of soluble chlorides <20 ppm).
Products I ISC O-Rings and Static Seals Merkel Endless Packing Rings Product description Product advantages Simrit manufactures endless packing rings in a whole variety of materials and dimensions. The sealing rings consist of a concentric hose braid and an optional elastomer core. The elastomer core guarantees a constant sealing force over the entire service life. This is ideal for static cover seals with a high number of open/close cycles.
