The tweed ring

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The tweed ring

The guide is an attempt to select the fewest number of elastomers that will give you satisfactory sealing of most of the chemicals we find in the process industry.

The following paragraphs describe the codes used in the chart. The compound specified is the specific one that has some water immersion capability.

E — Ethylene propylene C — Perfluoroelastomers. These are very expensive compounds. The tweed ring testing or plant experience is your best bet. If no elastomer proves to be acceptable a non-elastomer seal may be your only answer.

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Keep in mind that this o-ring selection chart is only a guide to help you in selecting the correct elastomer for your mechanical seal application. It was created from published information, various industry guide lines and many years of practical experience by field sales and engineering people.

Most mechanical seals use at least one dynamic elastomer, so even small amounts of swelling or chemical attack is almost always un-acceptable. When using this chart please keep the following in mind: If the elastomer is located close to the seal face it will see the additional heat that is being generated by rubbing friction.

Elastomers are poor conductors of heat. Cooling one side of the O-ring does not always allow the coolant to conduct to the hot side.

Oxidizers spontaneously emit oxygen at either room temperature or under slight heating. The oxygen can then combine with the carbon in mechanical seal faces or the carbon black used to color O-rings, causing chemical attack.

The largest group of oxidizing materials is comprised of peroxides. Hydrogen peroxide and benzoyl peroxide are typical. Permanganates, chlorates and some nitrates are also strong oxidizing agents.

These materials additionally constitute a dangerous fire hazard so two seals may be required.

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Chemical companies routinely develope new compounds. Check with your seal suplier to learn if any new elastomers have recently come on the market The degree of carbon and elastomer attack is determined by the chemical concentration and temperature. The higher the concentration and the higher the temperature, the more likely the attack.

Plant experience is your best protection, but if you have no experience in handling these chemicals it would be wise to immersion test both the black o-ring and carbon face prior to installing a mechanical seal.

You could duplicate the temperature by placing the test vessel in an oven, or on a hot plate when practical. This chart normally shows only individual chemicals so you may have to rely upon plant experience, or immersion test to determine compatibility. Most plants have prior experience in handling their chemicals, so look for elastomers in other mechanical seals, valves, gages, filters, strainers, hoses, lined pipe, etc.

It is always worth a try. Remember that each of these elastomers has an upper and lower temperature limit. Although the elastomer may be chemically compatible with the sealing fluid it could still fail if the temperature limit is exceeded.

The tweed ring

Excessive temperature is usually indicated by a change in weight, shape or appearance of the o-ring.Classic through and through. Button up this lamb-leather jacket from the Liz Claiborne New York Heritage Collection for instant polish.

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Selecting the correct elastomer (O- ring) for your mechanical seal application This paper is to be used with the O-ring selection guide you’ll find in the chart and data section of this web site. The guide is an attempt to select the fewest number of elastomers that will give you satisfactory sealing of most of the chemicals we find in the process industry.

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