7900 O-Profiles

Several types of O-profiles have been developed for different applications, each with their own benefits. O-profiles were developed for high performance shielding mainly for military applications. They are used where environmental and EMI screening is required but were little space is available. 

Four kinds of cores are available: solid, hollow extrusion, cell rubber and small rectangular shapes. These can be covered with metallized fabric foils or made out of conductive rubber. For optimal shielding performance a compression of 5-10% is recommended for solid elastomers and 10-50% for hollow extrusions and cell rubbers.

How to use

Solid elastomers are almost not compressible. They are easily deformed but do not change in volume as do sponge elastomers (PVC, EPDM, Neoprene) (See picture below). Therefore, allowance for material flow must be considered in the groove design.

The figure below shows the design for two different grooves. The left groove shows a typical rectangular groove, while the other shows a design which can mechanically retain circular cross section gaskets by side friction.

Shielding performance

Shielding effectiveness depends on surface, shape of gaskets and materials used.

Techical specifications solid elastomers

 Material options

Standard dimensions
Profiles

Hollow	Solid	Cell Rubber	Rectangular
0.3 x 0.9	1.0	2.1	0.25 x 1
0.5 x 1.2	1.4	3.0	0.25 x 1.5
0.5 x 1.6	1.6	3.5	0.25 x 2
0.7 x 1.9	1.8	4.0	0.25 x 2.5
1.5 x 2.6	2.0	4.5	0.25 x 3
1.5 x 3.1	2.4	5.0	0.5 x 1
1.5 x 3.6	2.6	5.5	0.5 x 1.5
2.0 x 4.1	2.8	6.0	0.5 x 2
2.4 x 0.8	3.0	6.5	0.5 x 2.5
3 x 5	3.5	7.0	0.5 x 3
3.2 x 1.1	4.0	7.5	0.8 x 1
4 x 6	5.0	8.0	0.8 x 1.5
6 x 3.2	5.4	8.5	0.8 x 2
6 x 8	6.0	9.0	0.8 x 2.5
7 x 10	7.0	9.5	0.8 x 3
8 x 12	8.0	10.0	1 x 1
9.5 x 6.4	9.0	11.0	1 x 1.5
12 x 15	10.0	12.0	1 x 2
12 x 16	11.0	15.0	1 x 2.5
16 x 20	12.0	18.0	1 x 3
	15.0	20.0	1.5 x 1
	18.0	22.0	1.5 x 2
	20.0	25.0	1.5 x 3

Standard dimensions
Jointed O-rings

A mm B mm 14.00 1.8 17.2 1.8 18.8 1.8 20.4 1.8 21.9 1.8 25.1 1.8 28.3 1.8 31.5 1.8 34.7 1.8 37.8 2.6 41.0 2.6 44.1 2.6

Benefits

• Easy to fit into grooves
• Deflection up to 50%
• Low closure force

Options

• Cut into accurate lengths or endless O-rings
• Drop out prevention fixtures
• UL94V-0 flame retardant core
• Silicone core for high temperatures up to 220°