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Updated: July 8th, 2008 05:26 PM EDT

Understanding sealer options

Sealer producers already reporting significant price increases.

Coal tar might be the best, but contractors have other alternatives when it comes to pavement sealer.
Asphalt-based sealer
Unlike a number of years ago, most sealer producers manufacture both a refined coal tar sealer and an asphalt-based sealer. Many sealer producers also offer a blended product containing both asphalt and coal tar. Neyra Industries, however, does not produce a blended product because the company feels the two materials are incompatible.
Sealer Test Stripes
Test strips at Gem Seal where the sealer producer monitors how various formulations of its asphalt-based product and its blended product hold up relative to its coal tar material.
asphalt-based sealers
Two of the newest options for sealcoating contractors are asphalt-based sealers that contain extremely small ceramic particles which the producers say strengthen the asphalt-based material and enable it to cure quicker than a pure asphalt-based material or a coal tar material.

Allan Heydorn
By Allan Heydorn
Editor

"The system that is created through the carbonyte process is predisposed to do a lot of things that a normal asphalt sealcoat can't do, with the target being an engineered composite that corrects potential deficiencies in asphalt systems," Rayner says.

He says Raynguard heats the asphalt, then adds Bitusperse during the emulsification process. The Bitusperse deposits small ceramic particles within the asphalt particle while it's still hot. He says that when the asphalt cools the molecules retain the ceramic particles, which he says is referred to as pre-nucleating the asphalt particles.

"That process and those ceramic particles allow further enhancement of the properties of the asphalt," Rayner says.

Additives and minerals are added, and all that cross-links within the material.

"You end up with a sealer that has balanced ion charges - an equal number of positive and negative ions - and that balance maintains suspension of the asphalt, aggregate, and minerals without the use of artificial thickeners and without the use of paper fibers."

He says once the sealer is applied to the pavement, the water begins evaporating, upsetting the ion balance.

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