British Columbia based Northstar Clean Technologies Inc. (TSXV: ROOF) (OTCQB: ROOOF) recently announced that it has received positive testing results from an independent third-party testing facility for two of its outputs, liquid asphalt and aggregate from used asphalt shingles.

After initiating steady state production, liquid asphalt and aggregate were produced through the reprocessing of single-use asphalt shingles currently stockpiled on-site at Northstar’s fully constructed asphalt shingle reprocessing facility in Delta, BC. These independent third-party test results for liquid asphalt and aggregate confirm that these products meet the Company’s end product specification objectives.

The table below compares the test results for Northstar’s liquid asphalt with common liquid asphalt specifications in Canada for the three major specification criteria for liquid asphalt:

  1. Softening point – the temperature at which the asphalt reaches a specific viscosity;
  2. Penetration – the hardness of the asphalt; and
  3. Flash point – the temperature at which vapours from the asphalt will ignite in the presence of a flame.

Table 1: Comparison



Shingle Asphalt

Type III

Type IV

Road 80-

Softening Point (°C)



88 – 113

85 – 96

99 -107


Penetration (dmm)
@ 25°C & 100g




15 – 35

12 – 25

80 – 100

Flash Point (°C)







1.       The specifications listed above are not exhaustive for all asphalt specifications.
2.       Any test requirement identified as N/A indicates that the test is not required for that product specification.

The Northstar specification analysis is as expected and designed and confirms that:

  • Northstar’s liquid asphalt specification most closely resembles shingle liquid asphalt. Also as expected, given the weathering of the asphalt shingle feed, Northstar’s liquid asphalt falls just outside of the penetration test results for shingle asphalt. Modification by shingle manufacturers to increase the penetration grade of liquid asphalt is a routine process and would be expected to involve minor blending operations of 0.5-2.0% rejuvenation product added to Northstar’s liquid asphalt to meet full specification.

  • Northstar’s liquid asphalt specification is also very close to that of Type III/IV bulk roofing liquid asphalt. Again, it is expected that minor blending operations of 2.0-5.0% rejuvenation product added to Northstar’s liquid asphalt would be required to meet full specification.

  • Paving liquid asphalt has the highest specification requirements and is generally much softer than roofing and shingle liquid asphalt. As expected, Northstar’s liquid asphalt will therefore be suitable for paving application by blending 5.0-10.0% of Northstar’s liquid asphalt into virgin asphalt to meet full paving specification.

Mr. Aidan Mills, President & CEO and Director of Northstar, stated, “We have always believed that the outputs created through our proprietary bitumen extraction and separation technology (“BEST”) design process were of high quality and now we have the independent test results to support this. Through commissioning and steady state production, we are now fully extracting liquid asphalt from asphalt shingles as designed and producing high quality end products, as expected. We believe this testing confirms that our two primary products will be able to re-enter the manufacturing process for asphalt shingles, creating a circular economy, and used in the hot-mix asphalt manufacturing process for road paving.”

As outlined by the results above, Northstar believes its liquid asphalt can be used for a number of purposes including asphalt shingle production, waterproofing applications, and hot-mix asphalt production.

About Northstar

Northstar Clean Technologies Inc. is a Vancouver-based clean technology company focused on the sustainable recovery and reprocessing of asphalt shingles. Northstar has developed a proprietary design process for taking discarded asphalt shingles, otherwise destined for already over-crowded landfills, and extracting the liquid asphalt, aggregate and fiber for usage in new hot mix asphalt, construction products and other industrial applications.

SOURCE: Northstar Clean Technologies Inc.