Seal Tech: Technical resources

Dash No.	I.D. (Inches)	Tol. +/-	C.S. (Inches)	Tol. +/-
001	0.029	0.004	0.040	0.003
002	0.042	0.004	0.050	0.003
003	0.056	0.004	0.060	0.003
004	0.070	0.005	0.070	0.003
005	0.101	0.005	0.070	0.003
006	0.114	0.005	0.070	0.003
007	0.145	0.005	0.070	0.003
008	0.176	0.005	0.070	0.003
009	0.208	0.005	0.070	0.003
010	0.239	0.005	0.070	0.003
011	0.301	0.005	0.070	0.003
012	0.364	0.005	0.070	0.003
013	0.426	0.005	0.070	0.003
014	0.489	0.005	0.070	0.003
015	0.551	0.007	0.070	0.003
016	0.614	0.009	0.070	0.003
017	0.676	0.009	0.070	0.003
018	0.739	0.009	0.070	0.003
019	0.801	0.009	0.070	0.003
020	0.864	0.009	0.070	0.003
021	0.926	0.009	0.070	0.003
022	0.989	0.010	0.070	0.003
023	1.051	0.010	0.070	0.003
024	1.114	0.010	0.070	0.003
025	1.176	0.011	0.070	0.003
026	1.239	0.011	0.070	0.003
027	1.301	0.011	0.070	0.003
028	1.364	0.013	0.070	0.003
029	1.489	0.013	0.070	0.003
030	1.614	0.013	0.070	0.003
031	1.739	0.015	0.070	0.003
032	1.864	0.015	0.070	0.003
033	1.989	0.018	0.070	0.003
034	2.114	0.018	0.070	0.003
035	2.239	0.018	0.070	0.003
036	2.364	0.018	0.070	0.003
037	2.489	0.018	0.070	0.003
038	2.614	0.020	0.070	0.003
039	2.739	0.020	0.070	0.003
040	2.864	0.020	0.070	0.003
041	2.989	0.024	0.070	0.003
042	3.239	0.024	0.070	0.003
043	3.489	0.024	0.070	0.003
044	3.739	0.027	0.070	0.003
045	3.989	0.027	0.070	0.003
046	4.239	0.030	0.070	0.003
047	4.489	0.030	0.070	0.003
048	4.739	0.030	0.070	0.003
049	4.989	0.037	0.070	0.003
050	5.239	0.037	0.070	0.003
102	0.049	0.005	0.103	0.003
103	0.081	0.005	0.103	0.003
104	0.112	0.005	0.103	0.003
105	0.143	0.005	0.103	0.003
106	0.174	0.005	0.103	0.003
107	0.206	0.005	0.103	0.003
108	0.237	0.005	0.103	0.003
109	0.299	0.005	0.103	0.003
110	0.362	0.005	0.103	0.003
111	0.424	0.005	0.103	0.003
112	0.487	0.005	0.103	0.003
113	0.549	0.007	0.103	0.003
114	0.612	0.009	0.103	0.003
115	0.674	0.009	0.103	0.003
116	0.737	0.009	0.103	0.003
117	0.799	0.010	0.103	0.003
118	0.862	0.010	0.103	0.003
119	0.924	0.010	0.103	0.003
120	0.987	0.010	0.103	0.003
121	1.049	0.010	0.103	0.003
122	1.112	0.010	0.103	0.003
123	1.174	0.012	0.103	0.003
124	1.237	0.012	0.103	0.003
125	1.299	0.012	0.103	0.003
126	1.362	0.012	0.103	0.003
127	1.424	0.012	0.103	0.003
128	1.487	0.012	0.103	0.003
129	1.549	0.015	0.103	0.003
130	1.612	0.015	0.103	0.003
131	1.674	0.015	0.103	0.003
132	1.737	0.015	0.103	0.003
133	1.799	0.015	0.103	0.003
134	1.862	0.015	0.103	0.003
135	1.925	0.017	0.103	0.003
136	1.987	0.017	0.103	0.003
137	2.050	0.017	0.103	0.003
138	2.112	0.017	0.103	0.003
139	2.175	0.017	0.103	0.003
140	2.237	0.017	0.103	0.003
141	2.300	0.020	0.103	0.003
142	2.362	0.020	0.103	0.003
143	2.425	0.020	0.103	0.003
144	2.487	0.020	0.103	0.003
145	2.550	0.020	0.103	0.003
146	2.612	0.020	0.103	0.003
147	2.675	0.022	0.103	0.003
148	2.737	0.022	0.103	0.003
149	2.800	0.022	0.103	0.003
150	2.862	0.022	0.103	0.003
151	2.987	0.024	0.103	0.003
152	3.237	0.024	0.103	0.003
153	3.487	0.024	0.103	0.003
154	3.737	0.028	0.103	0.003
155	3.987	0.028	0.103	0.003
156	4.237	0.030	0.103	0.003
157	4.487	0.030	0.103	0.003
158	4.737	0.030	0.103	0.003
159	4.987	0.035	0.103	0.003
160	5.237	0.035	0.103	0.003
161	5.487	0.035	0.103	0.003
162	5.737	0.035	0.103	0.003
163	5.987	0.035	0.103	0.003
164	6.237	0.040	0.103	0.003
165	6.487	0.040	0.103	0.003
166	6.737	0.040	0.103	0.003
167	6.987	0.040	0.103	0.003
168	7.237	0.045	0.103	0.003
169	7.487	0.045	0.103	0.003
170	7.737	0.045	0.103	0.003
171	7.987	0.045	0.103	0.003
172	8.237	0.050	0.103	0.003
173	8.487	0.050	0.103	0.003
174	8.737	0.050	0.103	0.003
175	8.987	0.050	0.103	0.003
176	9.237	0.055	0.103	0.003
177	9.487	0.055	0.103	0.003
178	9.737	0.055	0.103	0.003
201	0.171	0.005	0.139	0.004
202	0.234	0.005	0.139	0.004
203	0.296	0.005	0.139	0.004
204	0.359	0.005	0.139	0.004
205	0.421	0.005	0.139	0.004
206	0.484	0.005	0.139	0.004
207	0.546	0.007	0.139	0.004
208	0.609	0.009	0.139	0.004
209	0.671	0.009	0.139	0.004
210	0.734	0.010	0.139	0.004
211	0.796	0.010	0.139	0.004
212	0.859	0.010	0.139	0.004
213	0.921	0.010	0.139	0.004
214	0.984	0.010	0.139	0.004
215	1.046	0.010	0.139	0.004
216	1.109	0.012	0.139	0.004
217	1.171	0.012	0.139	0.004
218	1.234	0.012	0.139	0.004
219	1.296	0.012	0.139	0.004
220	1.359	0.012	0.139	0.004
221	1.421	0.012	0.139	0.004
222	1.484	0.015	0.139	0.004
223	1.609	0.015	0.139	0.004
224	1.734	0.015	0.139	0.004
225	1.859	0.018	0.139	0.004
226	1.984	0.018	0.139	0.004
227	2.109	0.018	0.139	0.004
228	2.234	0.020	0.139	0.004
229	2.359	0.020	0.139	0.004
230	2.484	0.020	0.139	0.004
231	2.609	0.020	0.139	0.004
232	2.734	0.024	0.139	0.004
233	2.859	0.024	0.139	0.004
234	2.984	0.024	0.139	0.004
235	3.109	0.024	0.139	0.004
236	3.234	0.024	0.139	0.004
237	3.359	0.024	0.139	0.004
238	3.484	0.024	0.139	0.004
239	3.609	0.024	0.139	0.004
240	3.734	0.028	0.139	0.004
241	3.859	0.028	0.139	0.004
242	3.984	0.028	0.139	0.004
243	4.109	0.028	0.139	0.004
244	4.234	0.030	0.139	0.004
245	4.359	0.030	0.139	0.004
246	4.484	0.030	0.139	0.004
247	4.609	0.030	0.139	0.004
248	4.734	0.030	0.139	0.004
249	4.859	0.035	0.139	0.004
250	4.984	0.035	0.139	0.004
251	5.109	0.035	0.139	0.004
252	5.234	0.035	0.139	0.004
253	5.359	0.035	0.139	0.004
254	5.484	0.035	0.139	0.004
255	5.609	0.035	0.139	0.004
256	5.734	0.035	0.139	0.004
257	5.859	0.035	0.139	0.004
258	5.984	0.035	0.139	0.004
259	6.234	0.040	0.139	0.004
260	6.484	0.040	0.139	0.004
261	6.734	0.040	0.139	0.004
262	6.984	0.040	0.139	0.004
263	7.234	0.045	0.139	0.004
264	7.484	0.045	0.139	0.004
265	7.734	0.045	0.139	0.004
266	7.984	0.045	0.139	0.004
267	8.234	0.050	0.139	0.004
268	8.484	0.050	0.139	0.004
269	8.734	0.050	0.139	0.004
270	8.984	0.050	0.139	0.004
271	9.234	0.055	0.139	0.004
272	9.484	0.055	0.139	0.004
273	9.734	0.055	0.139	0.004
274	9.984	0.055	0.139	0.004
275	10.484	0.055	0.139	0.004
276	10.984	0.065	0.139	0.004
277	11.484	0.065	0.139	0.004
278	11.984	0.065	0.139	0.004
279	12.984	0.065	0.139	0.004
280	13.984	0.065	0.139	0.004
281	14.984	0.065	0.139	0.004
282	15.955	0.075	0.139	0.004
283	16.955	0.080	0.139	0.004
284	17.955	0.085	0.139	0.004
309	0.412	0.005	0.210	0.005
310	0.475	0.005	0.210	0.005
311	0.537	0.007	0.210	0.005
312	0.600	0.009	0.210	0.005
313	0.662	0.009	0.210	0.005
314	0.725	0.010	0.210	0.005
315	0.787	0.010	0.210	0.005
316	0.850	0.010	0.210	0.005
317	0.912	0.010	0.210	0.005
318	0.975	0.010	0.210	0.005
319	1.034	0.010	0.210	0.005
320	1.100	0.012	0.210	0.005
321	1.162	0.012	0.210	0.005
322	1.225	0.012	0.210	0.005
323	1.287	0.012	0.210	0.005
324	1.350	0.012	0.210	0.005
325	1.475	0.015	0.210	0.005
326	1.600	0.015	0.210	0.005
327	1.725	0.015	0.210	0.005
328	1.850	0.015	0.210	0.005
329	1.975	0.018	0.210	0.005
330	2.100	0.018	0.210	0.005
331	2.225	0.018	0.210	0.005
332	2.350	0.018	0.210	0.005
333	2.475	0.020	0.210	0.005
334	2.600	0.020	0.210	0.005
335	2.725	0.020	0.210	0.005
336	2.850	0.020	0.210	0.005
337	2.975	0.024	0.210	0.005
338	3.100	0.024	0.210	0.005
339	3.225	0.024	0.210	0.005
340	3.350	0.024	0.210	0.005
341	3.475	0.024	0.210	0.005
342	3.600	0.028	0.210	0.005
343	3.725	0.028	0.210	0.005
344	3.850	0.028	0.210	0.005
345	3.975	0.028	0.210	0.005
346	4.100	0.028	0.210	0.005
347	4.225	0.030	0.210	0.005
348	4.350	0.030	0.210	0.005
349	4.475	0.030	0.210	0.005
350	4.600	0.030	0.210	0.005
351	4.725	0.030	0.210	0.005
352	4.850	0.030	0.210	0.005
353	4.975	0.037	0.210	0.005
354	5.100	0.037	0.210	0.005
355	5.225	0.037	0.210	0.005
356	5.350	0.037	0.210	0.005
357	5.475	0.037	0.210	0.005
358	5.600	0.037	0.210	0.005
359	5.725	0.037	0.210	0.005
360	5.850	0.037	0.210	0.005
361	5.975	0.037	0.210	0.005
362	6.225	0.040	0.210	0.005
363	6.475	0.040	0.210	0.005
364	6.725	0.040	0.210	0.005
365	6.975	0.040	0.210	0.005
366	7.225	0.045	0.210	0.005
367	7.475	0.045	0.210	0.005
368	7.725	0.045	0.210	0.005
369	7.975	0.045	0.210	0.005
370	8.225	0.050	0.210	0.005
371	8.475	0.050	0.210	0.005
372	8.725	0.050	0.210	0.005
373	8.975	0.050	0.210	0.005
374	9.225	0.055	0.210	0.005
375	9.475	0.055	0.210	0.005
376	9.725	0.055	0.210	0.005
377	9.975	0.055	0.210	0.005
378	10.475	0.060	0.210	0.005
379	10.975	0.060	0.210	0.005
380	11.475	0.065	0.210	0.005
381	11.975	0.065	0.210	0.005
382	12.975	0.065	0.210	0.005
383	13.975	0.070	0.210	0.005
384	14.975	0.070	0.210	0.005
385	15.955	0.075	0.210	0.005
386	16.955	0.075	0.210	0.005
387	17.955	0.085	0.210	0.005
388	18.955	0.090	0.210	0.005
389	19.955	0.095	0.210	0.005
390	20.955	0.095	0.210	0.005
425	4.475	0.033	0.275	0.006
426	4.600	0.033	0.275	0.006
427	4.725	0.033	0.275	0.006
428	4.850	0.033	0.275	0.006
429	4.975	0.037	0.275	0.006
430	5.100	0.037	0.275	0.006
431	5.225	0.037	0.275	0.006
432	5.350	0.037	0.275	0.006
433	5.475	0.037	0.275	0.006
434	5.600	0.037	0.275	0.006
435	5.725	0.037	0.275	0.006
436	5.850	0.037	0.275	0.006
437	5.975	0.037	0.275	0.006
438	6.225	0.040	0.275	0.006
439	6.475	0.040	0.275	0.006
440	6.725	0.040	0.275	0.006
441	6.975	0.040	0.275	0.006
442	7.225	0.045	0.275	0.006
443	7.475	0.045	0.275	0.006
444	7.725	0.045	0.275	0.006
445	7.975	0.045	0.275	0.006
446	8.475	0.055	0.275	0.006
447	8.975	0.055	0.275	0.006
448	9.475	0.055	0.275	0.006
449	9.975	0.055	0.275	0.006
450	10.475	0.060	0.275	0.006
451	10.975	0.060	0.275	0.006
452	11.475	0.060	0.275	0.006
453	11.975	0.060	0.275	0.006
454	12.475	0.060	0.275	0.006
455	12.975	0.060	0.275	0.006
456	13.475	0.070	0.275	0.006
457	13.975	0.070	0.275	0.006
458	14.475	0.070	0.275	0.006
459	14.975	0.070	0.275	0.006
460	15.475	0.070	0.275	0.006
461	15.955	0.075	0.275	0.006
462	16.455	0.075	0.275	0.006
463	16.955	0.080	0.275	0.006
464	17.455	0.085	0.275	0.006
465	17.955	0.085	0.275	0.006
466	18.455	0.085	0.275	0.006
467	18.955	0.090	0.275	0.006
901	0.185	0.005	0.056	0.003
902	0.239	0.005	0.064	0.003
903	0.301	0.005	0.064	0.003
904	0.351	0.005	0.072	0.003
905	0.414	0.005	0.072	0.003
906	0.468	0.005	0.078	0.003
907	0.530	0.007	0.082	0.003
908	0.644	0.009	0.087	0.003
909	0.706	0.009	0.097	0.003
910	0.755	0.009	0.097	0.003
911	0.863	0.009	0.116	0.004
912	0.924	0.009	0.116	0.004
913	0.986	0.010	0.116	0.004
914	1.047	0.010	0.116	0.004
916	1.171	0.010	0.116	0.004
918	1.355	0.012	0.116	0.004
920	1.475	0.014	0.118	0.004
924	1.720	0.014	0.118	0.004
928	2.090	0.018	0.118	0.004
932	2.337	0.018	0.118	0.004

Elastomer Family	ASTM Abbreviation	Recommended Shelf Life
Aflas®	–	Unlimited
Butyl Rubber, Isobutylene Isoprene	IIR	Unlimited
Chloroprene (Neoprene®)	CR	15 Years
Epichlorohydrin (Hydrin®)	ECO	N/A
Ethylene Acrylic (Vamac®)	AEM	15 Years
Ethylene Propylene, EPDM or EP	EP	Unlimited
Fluorocarbon (Viton®)	FKM	Unlimited
Fluorosilicone	FVMQ	Unlimited
Hydrogenated Nitrile, HNBR or HSN	HNBR	15 Years
Nitrile (Buna-N or NBR)	NBR	15 Years
Perfluorelastomer	FFKM	Unlimited
Polytetrafluoroethylene (Teflon®)	PTFE	N/A
Polyacrylate	ACM	15 Years
Polyurethane (Polyester or Polyether)	AU / EU	5 Years
Silicone	VMQ	Unlimited
Styrene Butadiene (Buna-S)	SBR	3 Years

ASTM Specifications

Most quality manufacturers of O-rings specify the physical properties of their product through ASTM (American Society of Testing and Materials) and/or SAE (Society of Automotive Engineers) designations. The purpose of doing so is to provide a standardized method of calling-out the required physical properties of a rubber product, based primarily on its type (heat resistance) and class (oil resistance). An example of an ASTM specification for a general purpose, sulfur-cured, 70 Duro Nitrile may be:

ASTM D2000-99 M2BG714 B14 EA14 EF11 EF21 EO34 Z1

How to read this ASTM call-out?

Revision Year

In this case, the document date is 1999.

If the M is present, the unit of measure is expressed in Metric units. If the letter M is not present however, the unit of measure is in English units (as in psi for the tensile strength). Prior to 1980, all ASTM specifications were in English units. Beginning in 1980, the Metric unit call-outs became the standard.

Grade Number

The grade number designates instances where more extensive tests are required. Any grade other than 1 mandates additional requirements that are spelled out in Table 6 of the D2000 document.

Type

Indicates the heat resistance properties of the elastomer.

Class

Indicates the oil resistance properties of the elastomer.

Hardness

The Shore A Durometer hardness requirement of the elastomer. In this case the 7 calls out 70 +/- 5 Durometer.

Tensile Strength

This indicates the minimum tensile strength of the elastomer. If the designation has an M after the revision year, then this call-out is stated in Metric units, megapascals (MPa). If no M is present, then the call-out is specifying the English unit, pounds-per-square inch (psi). In this example, the 14 is calling-out 14 MPa. The conversion to psi is: MPa x 145 = psi. Therefore, the psi tensile strength requirement of this designation is 14 x 145 = 2030psi.

Suffix Requirements

These indicate the additional testing requirements needed to satisfy this specification call-out. Each requirement is comprised of a suffix letter, calling out the property being tested, and the suffix numbers, which call out the the test method and test temperature. Z suffix tests denote a customer added or specific test that is not necessarily covered by the D2000 document.

Rubber Compound Profiles

Aflas®

Aflas® is the trade name (Asahi Glass Co.) for a non-conventional fluoroelastomer (FKM) material which has a different chemical structure than other fluoroelastomers. It is considered a "cousin" of the fluoroelastomers, but offers significant advantages over them. Aflas® exhibits excellent heat resistance; 3 months @ 446F, 30 days @ 500F and intermittent tolerance @ +572F. It also offers excellent chemical resistance to high concentrations of acids, alkali and oxidants under high temperatures. In addition, it offers exceptional electrical insulation properties, similar to those of Silicone and EPDM rubber. Aflas® is primarily used for automotive oil sealing components.

Butyl (IIR):

Butyl, also known as isobutylene isoprene, has exceptional resistance to gas permeation, along with excellent water and steam resistance. Butyl has a temperature range of -65F to +200F. For most O-ring applications, Ethylene Propylene (EP) has replaced Butyl due to similar properties, but with better heat and compression set resistance.

Chloroprene, Neoprene®(CR):

Chloroprene (Neoprene®) was one of the first synthetic materials developed as an air-oil resistant substitute for natural rubber. It has the unusual characteristic of being resistant to both petroleum lubricants and oxygen over a temperature range of -40F to +225F. It also provides good resilience and flex resistance.

Epichlorohydrin, Hydrin® (ECO):

Hydrin® is a specialty compound, acceptable for use over a temperature range of -40F to +275F. This compound combines good petroleum oil and fuel resistance, with good resistance to sunlight, ozone and weathering. Hydrin® has good chemical resistance, but may be corrosive to adjacent metal parts. It is frequently used for fuel and oil seals which may be exposed to weather.

Ethylene Acrylic, Vamac® (AEM):

Ethylene acrylic (Vamac®) is a specialty Dupont-Dow elastomer offering a temperature range of -40F to +300F. It provides low temperature flexibility for automotive applications including automatic transmission seals, power steering seals and gear box seals. It also exhibits excellent resistance to weathering, ozone and air aging.

Ethylene Propylene, EPDM, or EP (EP):

EP is a copolymer of ethylene and propylene, while EPDM is a terpolymer combining ethylene, propylene and a diene monomer. EP materials offer a temperature range of -65F to +300F and offer excellent resistance to ozone, weathering, steam, water and phosphate ester type hydraulic fluids. EP can be manufactured to conform to FDA requirements, making it ideal for use with foods and medical devices.

Fluorocarbon, VITON® (FKM):

VITON® is the trade name for DuPont-Dow elastomers fluorocarbon or FKM material. VITON® has a temperature range of -20F to +400F, and provides excellent resistance to a wide variety of chemicals, weather and compression set requirements. The relatively high level of fluorine in VITON® materials allows for exceptional resistance to chemical attack, but with limited low temperature capabilities. Intermittent exposure to +600F can be tolerated for brief periods of time. Many industrial products are now switching to O-rings made of VITON®, making it the most significant elastomer development in 50 years.

Fluorosilicone (FVMQ):

Fluorosilicone combine the best properties of fluorocarbons and silicones. Fluorosilicone resist solvents, fuel and oil (similar to Viton®); but also provide stability over a broad temperature range of -100F to +350F. This elastomer is frequently used in aircraft fuel systems. However, it is limited to static seal applications due to poor tear resistance.

Hydrogenated Nitrile, HNBR:

HNBR, sometimes referred to as Highly Saturated Nitrile (HSN), offers a temperature range of -25F to +350F. HNBR is often used in automotive refrigeration systems using Freon 134A, and in power steering seals using Type A Fluid. To manufacture HNBR, Nitrile is first dissolved in a solvent, then a catalyst is used and hydrogen gas hydrogenates the Nitrile. While HNBR is in the Nitrile family, it undergoes this extensive, and consequently expensive, process to become HNBR.

Nitrile, Buna-N (NBR):

Nitrile, also known as Buna-N or NBR, is a copolymer of Butadiene and Acrylonitirle. It is the most commonly used elastomer for sealing products. It has a temperature range of -40F to +250F and is exceptionally resistant to petroleum base oils and hydrocarbon fuels. Nitrile materials also exhibit excellent tensile strength and abrasion resistance properties. This material performs well with most dilute acids, silicone oils and lubricants and in water applications. It is not recommended for use with ketones, aromatic hydrocarbons and phosphate ester hydraulic fluids. Ozone resistant nitriles are recommended where extended exposure to air and ozone are anticipated. More than 50% of the O-rings sold are nitrile O-rings, commonly used in hydraulic/pneumatic motors, cylinders, pumps and valves.

Perfluoroelastomers (FFKM):

Perfluoroelastomers combine the chemical resistance of Teflon with the elasticity of Viton to make a fully fluorinated polymer with superior chemical resistance over traditional elastomers. Saturation by Fluorine along the polymer backbone provides exceptional immunity from chemical attack and temperature range from -25F to +590F. These compounds are usually used in high temperature or caustic chemical applications where traditional elastomers degrade or show reduced product life.

Polyacrylate (ACM):

Polyacrylate offers a broad temperature range of -20F to +350F. Often used in automobile transmissions and power steering seals using type A fluid, it has excellent resistance to petroleum fuel and oils. It also exhibits good ozone and oxidation resistance, as well as good flex cracking resistance.

Polyurethane (AU/AE):

Polyurethane compounds offer exceptional abrasion and wear resistance and are offered in two distinctively different variations. For use in oil, use a polyester type which has low volume swell, but softens dramatically when exposed to water. For water sealing applications, use the polyether type which retains its integrity in water, but swells significantly when exposed to oil. A hybrid version that is acceptable for both applications is available at a substantially higher cost.

Polytetrafluoroethylene, Teflon ® (FEP):

Polytetrafluoroethylene is a completely fluorinated polymer that is the most chemically resistant polymer available. PTFE can withstand a very wide temperature range from -300F to +500F. It is inert to most chemicals and solvents with very few substances that degrade the material (notably fluorine, chlorine trifluoride and molten alkali metal solutions) PTFE is also very slippery and repels virtually everything making it perfect for applications that require a high coefficient of friction. PTFE is not crossed-linked like a regular elastomer and therefore has poor elastic memory, can deform under constant compressive load and can be damaged during installation.

Silicone (VMQ):

Silicone materials offer outstanding temperature resistance across a broad range, from -80F to +400F. Silicone materials provide excellent resistance to sunlight, ozone, oxygen, UV light and moisture. It's inert qualities make it the preferred material for use with food handling and medical applications. Silicones offers poor tensile, tear and abrasion resistance, and are not recommended for use in dynamic applications.

SBR:

SBR, styrene butadiene, or Buna-S, was originally developed to replace natural rubber in tires. While sometimes used for automobile brake system seals, it has been replaced in most applications by ethylene propylene which offers superior heat and compression set resistance.

PureSlip (ILC):

PureSlip is Seal Tech's proprietary internal-lubricant for Nitrile (Buna-N) and ethylene propylene (EP or EPDM) O-ring compounds. It was developed for use in applications where incredibly low breakout friction and low running friction are required. This specially formulated internal-lubricant provides the lowest coefficient of friction for any O-ring when compared to compounds filled with Teflon, moly-disulfide, silicone or wax. It also conforms to FDA per CFR 177.2600.

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