880 FRANCEJOINT | Alldatasheet
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Technical content
DESCRIPTION The BECA 880 profile is a machined, U-ring type filled or virgin PTFE shaft seal, pre-stressed by a stainless steel V-spring. It is generally used for helical applications. Derived from the BECA 880 profile, the BECA 889 profile is made specially for food industry applications. It is distinguished by a silicone cord, which completely hides the V-spring, thus preventing food products from accumulating in this hard-to-clean area. ADVANTAGES It is suitable for static, rotating and oscillatory systems Protects against the effects of mechanical twisting Low friction coefficient Excellent abrasion resistance Suitable for a wide temperature range Special profiles for the medical, food industry and pharmaceutical sectors APPLICATIONS Food & Beverage Medical Pharmaceutical General industry MATERIALS Profiled seal Virgin PTFE Carbon-filled PTFE Metal insert Stainless steel - AISI 316 PTFE SHAFT SEALS BECA 880-889 TECHNICAL DATA Temperature -100°C / +260°C Pressure In dynamic applications: 15 MPa In static applications: 25 MPa Speed 2 m/s Media The majority of fluids Gaseous fluids Chemical products The figures above indicate the maximum values and may not be cumulated. They may be developed, depending on the materials used. SHAFT HARDNESS We recommend achieving a minimum hardness of 55 HRC for the correct operation of the BECA 880 seal while rotating. EXTRUSION GAPS Groove width L1 min Radial extrusion gap F/2
2 MPa 10 MPa 20 MPa
3.60 0.25 0.15 0.10 4.80 0.35 0.20 0.15 7.10 0.50 0.25 0.20 9.50 0.60 0.30 0.25 SURFACE ROUGHNESS Fluids Dynamic surface area Static surface area Groove flanks High and low viscosity fluids Ra = 0.2 µm Ra = 0.8 µm Ra = 0.8 µm Rz = 1.6 µm Rz = 5.0 µm Rz = 5.0 µm Rmax = 2.5 µm Rmax = 6.5 µm Rmax = 6.5 µm Gaseous fluids Ra = 0.1 µm Ra = 0.3 µm Ra = 0.3 µm Rz = 0.63 µm Rz = 2.2 µm Rz = 2.2 µm Rmax = 1.0 µm Rmax = 3.5 µm Rmax = 3.5 µm CHAMFERS AND RADIUS Series Chamfer C 880.1 4.50 880.2 5.00 880.3 8.00 880.4 12.00 QUALITY & EXPERTISE FOR YOUR SEALING NEEDS ROTARY SEALS | PTFE SHAFT SEALS | BECA 880 - 889
TABLE MATERIALS Other grades of materials are available depending on your specificities. Profiled seal V-spring Mating surface materialStandard code ISO code Material Colour Characteristics Code Type of material Service temperature DP P Virgin PTFE White Resistance to chemical products Impermeability Dielectric Non-stick Low friction coefficient Food industry I X10 Cr Ni 18-8 -200°C/+260°C Steel Stainless steel Chrome steel Aluminium Bronze Cast iron Treated surface DC C PTFE + 25% Carbon Grey Improvements
- Wear properties
- Compression set Good resistance to chemical products Thermal and electrical conductivity Anti-static High-performing in compression-based dynamic applications I X10 Cr Ni 18-8 -200°C/+260°C CG C PTFE + 23% Carbon + 2% Graphite Black I X10 Cr Ni 18-8 -200°C/+260°C DV V PTFE + 25 % Glass Blue Improvements
- Wear properties
- Mechanical strength Slightly more abrasive, however, this is corrected by adding MOS2 Maintains its chemical and dielectric properties Well-suited to applications with rotational and simultaneous alternating movements I X10 Cr Ni 18-8 -200°C/+260°C Steel Chrome steel Cast iron VM M PTFE + 15 % Glass + 5% MOS2 Grey I X10 Cr Ni 18-8 -200°C/+260°C DX X PTFE GL Blue + Glass + Metal oxides Turquoise blue Resistance to compression Resistance to wear Excellent chemical stability Good thermal conductivity I X10 Cr Ni 18-8 -200°C/+260°C DG G PTFE + 15% Graphite Black Improvements
- Wear properties Reduced wear on metal parts Self-lubricating Thermal and electrical conductivity Low permeability Good friction coefficient Anti-static High performing in dynamic self-lubricating
applications
I X10 Cr Ni 18-8 -200°C/+260°C Steel Stainless steel Chrome steel Aluminium Bronze Cast iron Treated surfaceK1 K PTFE + 10% Ekonol Light brown Improvements
- Better abrasion resistance
- Better dimensional stability at high temperatures Use up to +300°C Good friction coefficient and low permeability I X10 Cr Ni 18-8 -200°C/+260°C K2 K PTFE + 20% Ekonol Light brown I X10 Cr Ni 18-8 -200°C/+260°C DB B PTFE + 60% Bronze Dark brown Improvements
- Wear properties
- Warping resistance and creep strength
- Compression resistance Self-lubricating Electrical and thermal conductivity Does not alter the metal parts Reduced hold with certain chemical products Used for high-compression dynamic seals and has a low level of wear I X10 Cr Ni 18-8 -200°C/+260°C Steel Chrome steel Cast ironB4 B PTFE + 40% Bronze Dark brown I X10 Cr Ni 18-8 -200°C/+260°C www.francejoint.com ROTARY SEALS | PTFE SHAFT SEALS | BECA 880 - 889
C 30° ØD2 ØD1 Ød1 F_2 INSTALLATION DIMENSIONS Series Rod diameter Ød1 f8/h9 Groove diameter Groove width Chamfer Radius BECA 880 Standard range BECA 880 Extended range ØD1 H9 ØD2 H10 L1 min L2 C R * The codes that define the materials are set out in the materials table on the previous page. EXAMPLE OF CODIFICATION STANDARD CODIFICATION Materials ________ : PTFE + 25% Carbon profiled seal - Code DC Shaft diameter ____: Ød1 + 20.00 mm Groove diameter __ : ØD1 = 27.00 mm Groove diameter __ : ØD2 = 32.50 mm Part number ______: 880.2020DCI Family Shaft diameter Profiled seal material* V-Shaped spring material* 880.2 020 DC IPart number - FRANCE JOINT SAS Zone Artisanale Le Mortier - B.P . 50009 - Cugand - 85613 Montaigu Cedex - France Ph. +33 (0)2 51 42 13 76 - Fax +33 (0)2 51 43 61 14 - Email: contact@francejoint.fr - Website: www.francejoint.com ROTARY SEALS | PTFE SHAFT SEALS | BECA 880 - 889