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From ; BLUE LINE TECHN 6 IES 530 671 5208 0l 2003 18.10 #289 P , 002/005 T E C H N O L 0 Q I E g Chemical Resistance Analysis Summary; In this study it was our objective to look at the materials used in most of the fittings we are in the potroloum market currcndy. It was *iorvod that there are some significant problems with most of the entry fittings used in the petroleum fitlirtgs market. Two problems aro most slgnlficant, It was determined in our study that Natural and Nitrile Rubber elastomers generally have good chemical and water resistance but poor resistance to the deteriorating offocts of ozone and aromatic hydrocarbons, Nitrile tubber is heavily used in this application and this ozone issue is the reason we sea such widespread failure in boots constructed of this type of material. Wo looked at both the effects of immorsion Posts as well as ozone exposure and found that there really aren't any Nitrile rubber formulations that demonstrate a good resistance to ozone or hydrocarbons. The socond major issue is the effects of water on Estano 58300 elastomor. Though each different olastomor demonstrates differing propertlos, the general effect is a poor resistance to water especially when the temperature is raised to 100 degrees F. In general we found that polyurethanes were the best choice for this application duo to there rosl;tance to chemicals, water, ozone, and hydrocarbons, but in the case of Estano the potentisd effects of water were significant as demonstrated in our support material. It was important in doing this evaluation that wo look closely at the major causes of the failures wo have icon and at the overall general physical property changes that occurred to those various materials when exposed to a variety of different fuels and conditions, In general if we observed a significant physical property chango in the material after exposure then we concluded that the material was likely to suffer degradation as a result of long terra exposure to water, fuels, and ozone. Nitrilo, AJcryn, and Bstane all demonstrated weaknesses in some areas, It is also important to point out that physical property loss seems to be accelerated once there begins to be some change caused in the material, making it difficult to pinpoint the exact causes, Our recommendation is that we use. Pollothane for all Bluellne fittings, This is the only product family that demonstrated strong resistwice to physical property change after exposure to Nels and water as well as having the ozone and hydrocarbon resistance inherent in most of the urethane family of elastomers, Although the data we compiled on the Follothane 2102.was excellent, Dow Chemical recommends that we use their latest Pellethane technology (2355.75) as it has additionally improved upon its water and fuel resistanco properties, It has also proven this point in our in house tasting, Blueline Technologies Confidential 6/5/02