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TECHNICAL DOCUMENTATION

Application Characteristics of Non-Metallic Seals and Gaskets

Release Date:

2026-06-18

1> Maximum Working Pressure for Rubber O-Rings and Star Seals—Clearance Values Table/Groove Dimensions
1. Gaps and Extrusion: Fluid pressure can cause the O-ring to extrude from the groove and become damaged. Extrusion is determined by the fluid pressure, the gap width b, and the hardness of the rubber.

2. Measures to prevent extrusion: When pressure or clearance exceeds the allowable limits, use a PTFE retaining ring. With pressure applied on both sides, install the ring on either side of the O-ring; when pressure is applied from one side, install it on the opposite side.

3. O-Ring Groove Dimension Table [mm]

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O-ring Wire diameter	T (inner diameter ≤50)	r	Static seal					Dynamic seal
			Rough Degree Ra	a	L ⁺ ⁰ ^. ²			Rough Degree Ra	a	L ⁺ ⁰ ^. ²
			Rough Degree Ra	a	Without retaining ring	Single snap ring	Double snap ring	Rough Degree Ra	a	Without retaining ring	Single snap ring	Double snap ring
1.50mm	1.0	0.1	1.6	1.12	2.0	3.1	4.2	≤0.8	1.28	1.9	3.0	4.1
1.78mm	1.2	0.1	1.6	1.34	2.4	3.7	5.0	≤0.8	1.54	2.3	3.6	4.9
2.00mm	1.2	0.2	1.6	1.50	2.7	4.0	5.3	≤0.8	1.72	2.5	3.8	5.1
2.62mm	1.2	0.2	1.6	2.02	3.6	4.9	6.2	≤0.8	2.30	3.2	4.5	5.8
3.00mm	1.2	0.2	1.6	2.30	4.0	5.3	6.6	≤0.8	2.64	3.7	5.0	6.3
3.53mm	1.2	0.2	1.6	2.72	4.7	6.0	7.3	≤0.8	3.10	4.3	5.6	6.9

Star-shaped ring Wire diameter	T (inner diameter ≤50)	r	Rough Degree Ra	a	L ⁺ ⁰ ^. ²
Star-shaped ring Wire diameter	T (inner diameter ≤50)	r	Rough Degree Ra	a	Without retaining ring	Single snap ring	Double snap ring
1.78mm	1.2	0.1	≤0.8	1.56	2.2	3.5	4.8
2.62mm	1.2	0.2	≤0.8	2.30	3.2	4.5	5.8
3.53mm	1.2	0.2	≤0.8	3.14	4.2	5.5	6.8

Valve seat material	POM	PTFE	PEEK	PVDF	PCTFE	UHMWPE
Temperature (°C)	Maximum working pressure (bar)
-20～+30	450	87	650	200	290	105
~+65	300	66	620	190	195	88
~+93	160	50	590	175	123	54
~+121	——	40	480	160	62	——
~+148	——	28	385	120	——	——
~+176	——	22	290	--	——	——
~+204	——	15	215	--	——	——
~+232	——	7	140	--	——	——