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4 From : BLUE LINE TECHNO ' ES 530 671 5208 01/""0003 18:10 #289 P-002/005 e L t t c # K t�. glxli'2i(1� l T E C N N O Eur 0 Q I E S. Chemical Resistance Analysis summary: In this study it was our objective to look at the materials used in most of the fittings we see in the petroleum market currently. It was observed that there are some significant problems with most of the entry fittings used in the petroleum fittings market. Two problems are most significant. 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 effects of ozone and aromatic hydrocarbons, Nitrile rubber is heavily used in this application and this ozone issue is the reason we see such widespread failure in boots constructed of this type of material, We looked at both the effects of immorsion tests 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 second major issue is the effects of water on Estano 58300 elastomer. Though each different elastomer demonstrates differing properties, 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 due to there roslatance to chemicals, water, ozone, and hydrocarbons, but in the case of Estane the potential effects of water ware significant as demonstrated in our support material. It was Important in doing this evaluation that we look closely at the major causes of the failures we have seen and at the overall general physical property changes that occurred to these various materials when exposed to a variety of different fuels and conditions, In general if we observed a significant physical property change in the material after exposure then we concluded that the material was likely to suffor degradation as a result of long term exposure to water, fuels, and ozone. Nitrilo, A.lcryn, and Estane 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. Pellethans for all Bluslins fittings, Ilia is the only product famlly that demonstrated strong resistance to physical property change after exposure to fuels end 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 Pollethane 2102.was excellent, Dow Chemical reconunends that we use their latest Pellethane technology (2355-75) as It has additionally improved upon its water and fuel resistance properties, It has also proven this point in our in house testing, Blueline Technologies Confidential 6/5/02