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NORA Specifications for Vacuum Tower Asphalt Extender Available

Friday, July 10, 2015  
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NORA, An Association of Responsible Recyclers has developed two specifications related to Vacuum Tower Asphalt Extender (VTAE), one for use in pavement construction and one for use in roofing. 

The specifications are intended to assure the reliability and quality of VTAE products.  The proposed specifications are performance based and are not intended to preclude the use of any particular VTAE product. 


VTAE is derived from used oil distillation. According to the producers of VTAE, the product provides the critical element of flexibility to “hard asphalt” and enhances the performance of ordinary asphalt with adhesive strength, joint sealing and other qualities such as water proofing.  VTAE, which has been referred in the past to asphalt flux, asphalt extender, vacuum tower bottoms and other names, has been successfully used as an ingredient in asphalt pavement and roofing since at least 1983.  

In 2014, certain states issued bans related to the use of VTAE in asphalt pavement because of concerns of negative impacts from the use of the product.  NORA has taken a leadership role in bringing various sectors (NORA members as well as non-members) from the industry together to develop the VTAE specifications. In addition, research is currently underway that will address the concerns of the states that have banned these materials.



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