O-Ring P Series

Type		JIS Nominal Number	W	Inner Diameter			Compatible Materials
Type	No.			do	NPA·NPB Tolerance	NPF·NPFH Tolerance	d	Tolerance	D	Tolerance
E-PACK-NPA (Nitrile Rubber, Black) E-PACK-NPF (Fluoro Rubber, Black) E-PACK-NPFH (Fluoro Rubber, Black) E-PACK-NPF (Fluoro Rubber, Black) E-PACK-NPFH (Fluoro Rubber, Black)	3	P3	1.9±0.08	2.8	±0.14	±0.16	3	0 -0.05	6	0.05 0
	4	P4		3.8			4		7
	5	P5		4.8	±0.15	±0.18	5		8
	6	P6		5.8			6		9
	7	P7		6.8	±0.16	±0.19	7		10
	8	P8		7.8			8		11
	9	P9		8.8	±0.17	±0.20	9		12
	10	P10		9.8			10		13
	10A	P10A	2.4±0.09	9.8			10	0 -0.06	14	0.06 0
	11	P11		10.8	±0.18	±0.21	11		15
	11.2	P11.2		11			11.2		15.2
	12	P12		11.8	±0.19	±0.22	12		16
	12.5	P12.5		12.3			12.5		16.5
	14	P14		13.8			14		18
	15	P15		14.8	±0.20	±0.24	15		19
	16	P16		15.8			16		20
	18	P18		17.8	±0.21	±0.25	18		22
	20	P20		19.8	±0.22	±0.26	20		24
	21	P21		20.8	±0.23	±0.27	21		25
	22	P22		21.8	±0.24	±0.28	22		26
	22A	P22A	3.5±0.1	21.7			22	0 -0.08	28	0.08 0
	22.4	P22.4		22.1			22.4		28.4
	24	P24		23.7			24		30
	25	P25		24.7	±0.25	±0.30	25		31
	25.5	P25.5		25.2			25.5		31.5
	26	P26		25.7	±0.26	±0.31	26		32
	28	P28		27.7	±0.28	±0.33	28		34
	29	P29		28.7	±0.29	±0.34	29		35
	29.5	P29.5		29.2			29.5		35.5
	30	P30		29.7			30		36
	31	P31		30.7	±0.30	±0.36	31		37
	31.5	P31.5		31.2	±0.31	±0.37	31.5		37.5
	32	P32		31.7			32		38
	34	P34		33.7	±0.33	±0.39	34		40
	35	P35		34.7	±0.34	±0.40	35		41
	35.5	P35.5		35.2			35.5		41.5
	36	P36		35.7			36		42
	38	P38		37.7	±0.37	±0.44	38		44
	39	P39		38.7			39		45
	40	P40		39.7			40		46
	41	P41		40.7	±0.38	±0.45	41		47
	42	P42		41.7	±0.39	±0.48	42		48
	44	P44		43.7	±0.41	±0.49	44		50
	45	P45		44.7			45		51
	46	P46		45.7	±0.42	±0.50	46		52
	48	P48		47.7	±0.44	±0.52	48		54
	50	P50		49.7	±0.45	±0.54	50		56
	50A	P50A	5.7±0.13					0 -0.1	60	0.1 0
	52	P52		51.6	±0.47	±0.56	52		62
	53	P53		52.6	±0.48	±0.57	53		63
	55	P55		54.6	±0.49	±0.58	55		65
	56	P56		55.6	±0.50	±0.60	56		66
	58	P58		57.6	±0.52	±0.62	58		68
	60	P60		59.6	±0.53	±0.63	60		70
	62	P62		61.6	±0.55	±0.66	62		72
	63	P63		62.6	±0.56	±0.67	63		73
	65	P65		64.6	±0.57	±0.68	65		75
	67	P67		66.6	±0.59	±0.70	67		77
	70	P70		69.6	±0.61	±0.73	70		80
	71	P71		70.6	±0.62	±0.74	71		81
	75	P75		74.6	±0.65	±0.78	75		85
	80	P80		79.6	±0.69	±0.82	80		90

 

When synthetic rubber comes into contact with different liquids, the following phenomena may occur depending on the type of liquid.
● Swelling after absorbing liquid (swelling)
● Bond breakdown due to chemical reaction (decomposition)
● Product becomes thinner after additives precipitate (extraction)
These adverse reactions in rubber often lead to poor sealing performance in sealing products. It is recommended to first confirm whether the material and the sealing medium will react when selecting materials for sealing products.
In addition, temperature and the type of additives will also affect the reaction results; even the same medium may react differently at different temperatures. When liquids are mixed, the effect on rubber is multiplied due to the combined effect.