QUALITY & EXPERTISE FOR YOUR SEALING NEEDS



EXTRUSION GAPS

Radial section

S

Radial gap

F/2

10 MPa

20 MPa

40 MPa

2.45

0.30

0.20

0.15

3.75

0.40

0.25

0.15

5.50

0.40

0.25

0.20

7.75

0.50

0.30

0.20

10.50

0.60

0.35

0.25

12.25

0.60

0.35

0.25

14.00

0.70

0.50

0.30

19.00

1.00

0.70

0.60



SURFACE ROUGHNESS

Roughness

Dynamic surface area

Static surface area

Groove flanks

Ra

0.05 - 0.2 µm

≤1.6 µm

≤3.2 µm

Rz

0.4 - 1.6 µm

≤6.3 µm

≤10.0 µm

Rmax

0.63 - 2.5 µm

≤10.0 µm

≤16.0 µm



CHAMFERS AND RADIUS

Radial section

S

Radius

R1

Radius

R2

Chamfer

C

2.45

0.30

0.40

3.00

3.75

0.30

0.60

3.00

5.50

0.30

1.00

3.00

7.75

0.30

1.30

5.00

10.50

0.30

1.80

6.00

12.25

0.30

1.80

8.00

14.00

0.30

2.50

10.00

19.00

0.30

3.00

12.00



DESCRIPTION

The BECA 500 - 502 - 504 profiles

are double acting composite piston

seals composed of a filled PTFE

friction ring and pre-tightened rubber

O'Ring. They can be assembled

in grooves according to standard

ISO 7425/1. Option of connecting

the seal to 1 or 2 back-up rings.



ADVANTAGES

Optimal sealing in static and

dynamic applications

Low friction coefficient;

no stick-slip effect

Excellent abrasion and

extrusion resistance

Wide temperature range and excellent

chemical resistance, depending on

the material selected for the O'Ring



APPLICATIONS

Mobile hydraulics

Injection presses

Machine tools

Presses

Standard cylinders



MATERIALS

Friction ring

Bronze-filled PTFE

Carbon-filled PTFE

Blue GL PTFE

O'Ring

NBR 70 Shore A

FKM 70 Shore A

Other grades of materials are

available. Please refer to the

materials table on the next page.



TECHNICAL DATA

Temperature

-30°C / +200°C

Pressure

50 MPa

Speed

5 m/s

Media

Mineral hydraulic oils

Fire-resistant liquids

Biocompatible fluids

Water

Others (contact our experts)

The figures above indicate the maximum values and may not be cumulated. They may be

developed, depending on the materials used.

PISTON SEALS

BECA

500-502-504

HYDRAULIC SEALS | PISTON SEALS |

BECA 500 - 502 - 504