UrePac is a hydraulic and pneumatic seal manufactured using the highest grade thermoplastic polyurethane (TPU). The UrePac is essentially a u-cup design with an o-ring expander (spring) to help maintain a constant load on the sealing lips even under zero to low pressure.  During elevated pressures, the o-ring is also pressurized and expands outward helping to force the ID and OD sealing lips against the sealing surfaces.  When the system is shut down and pressure is no longer in play, the o-ring maintains a "load" on the sealing lips preventing leakage from a shut down system,  which is often identified as "standing" leakage.

UrePacs are available in four (4) lip configurations to accommodate most all applications and can be interchangeable with other types of seal designs such as o-rings, u-packing, chevron (vee) packing, etc. Lip styles are:
(a) Standard A- square cross section with flat lips
(b) Deep A- rectangular cross section with flat lips and the height is more (longer) then the cross section.
(c) Type B- same as the Deep except the sealing lips are beveled (back beveled)
(d) Square B- same as the Type B except cross section and height are the same (square).

UrePacs are also available in a variety other materials as a "special order".

P/N	I.D.	O.D.	c/s	ht	Materials
12500625	.625	.875	.125	--	PU 90-93 + NBR70 o-ring
12501000	1.000	1.250	.125	--	PU 90-93 + NBR70 o-ring
12501000-250B	1.000	1.250	.125	.250	PU 90-93 + NBR70 o-ring
12502750	2.750	1.437	.125	--	PU 90-93 + NBR70 o-ring
12503000	3.000	3.250	.125	--	PU 90-93 + NBR70 o-ring
18701250	1.250	1.624	.187	--	PU 90-93 + NBR70 o-ring
18703250	3.250	3.624	.187	--	PU 90-93 + NBR70 o-ring
18704750	4.750	5.124	.187	--	PU 90-93 + NBR70 o-ring
20001500-375B	1.500	2.000	.250	.375	PU 90-93 + NBR70 o-ring
250001375-375B	1.275	1.775	.250	.375	PU 90-93 + NBR70 o-ring
25002000-375B	2.000	2.500	.250	.375	PU 90-93 + NBR70 o-ring
25002000-375D	2.000	2.500	.250	.375	PU 90-93 + NBR70 o-ring
25002500	2.500	3.000	.250	--	PU 90-93 + NBR70 o-ring
25002500-375D	2.500	3.000	.250	.375	PU 90-93 + NBR70 o-ring
25003500	3.500	4.000	.250	--	PU 90-93 + NBR70 o-ring
25003500-375B	3.500	4.000	.250	.375	PU 90-93 + NBR70 o-ring
25004000-562D	4.000	4.500	.250	.562	PU 90-93 + NBR70 o-ring
25004125	4.125	4.625	.250	--	PU 90-93 + NBR70 o-ring
25004250	4.250	4.750	.250	--	PU 90-93 + NBR70 o-ring
25004500	4.500	5.000	.250	--	PU 90-93 + NBR70 o-ring
25004500-375D	4.500	5.000	.250	.375	PU 90-93 + NBR70 o-ring
25004750	4.750	5.250	.250	--	PU 90-93 + NBR70 o-ring
25005000	5.000	5.500	.250	--	PU 90-93 + NBR70 o-ring
25005000-375D	5.000	5.500	.250	.375	PU 90-93 + NBR70 o-ring
25005000-562D	5.000	5.500	.250	.562	PU 90-93 + NBR70 o-ring
25008250	8.250	8.750	.250	--	PU 90-93 + NBR70 o-ring
25008500	8.500	9.000	.250	--	PU 90-93 + NBR70 o-ring
31201750-500B	1.750	2.374	.312	.500	PU 90-93 + NBR70 o-ring
31203625-500B	3.625	4.249	.312	.500	PU 90-93 + NBR70 o-ring
31204125-562B	4.125	4.749	.312	.562	PU 90-93 + NBR70 o-ring
31206250	6.250	6.874	.312	--	PU 90-93 + NBR70 o-ring
37503000	3.000	3.750	.375	--	PU 90-93 + NBR70 o-ring
37503250	3.250	4.000	.375	--	PU 90-93 + NBR70 o-ring
37503750	3.750	4.500	.375	--	PU 90-93 + NBR70 o-ring
37504000	4.000	4.750	.375	--	PU 90-93 + NBR70 o-ring
37504250-625D	4.250	5.000	.375	.625	PU 90-93 + NBR70 o-ring
37504750-625B	4.750	5.500	.375	.625	PU 90-93 + NBR70 o-ring
37505250-625D	5.250	6.000	.375	.625	PU 90-93 + NBR70 o-ring
37507250	7.250	8.000	.375	--	PU 90-93 + NBR70 o-ring
37507250-625D	7.250	8.000	.375	.625	PU 90-93 + NBR70 o-ring

All sizes listed may not be currently tooled.
Other materials available. Please contact our office to request a quote.