BS EN 3746-2003 pdf download.O-rings , in fluorosilicone rubber FVMQ – Hardness 80 IRHD.
This BS EN 3746 specifies the characteristics of 0-rings in fluorosilicone rubber (FVMO), hardness 80 IRHD for aerospace applications.
2 Normative references
Iso 3601-1 Fluid systems – Sealing devices – 0-rings – Part 1 : inside diameters, cross-sections, tolerances and size identification code
EN 3376 Aerospace series – Limits of surface imperfections of elastomeric toroidal sealing rings (0-rings) 1) EN 3747 Aerospace series – 0-rings, in tluorosilicone rubber (FVMQ) – Technical specification
EN 3827 Aerospace series- Fluorosilicone rubber (FVMQ) – Hardness 80 IRHD 2)
3 Application
3.1 Typical use
These 0-rings are intended to be used in air, mineral and synthetic oil and fuel systems.
NOTE: Not to be used with phosphoric ester type hydraulic fluids (permanent or temporary immersion).
1) Published as AECMA Prestandard at the date of publication of this standard
2) In preparation at the date of publication of this standard
3.2 Temperature range
– Continuous service: from -55 °C to + 150 °C;
• Intermitent service: from -55 °C to + 200 °C.
4 Required characteristics
4.1 Configuration – Dimensions – Tolerances — Masses Dimensions and tolerances are in millimetres.
4.1.1 Configuration code A
Section diameter d2 1.8 ± 0,08 3)
See figure 1 arid table 1
7 Marking
EN 3747
8 Technical specification
EN 3747.BS EN 3746-2003 pdf download.

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