3M's innovative smog-reducing roofing granules
that reduce air pollution have a new champion.
Screened and washed, carefully sized quartz grains are used as filter media and roofing granules
. Quartz sands are used for traction in the railroad and mining industries.
Key statement: The present invention provides shaped articles comprising one or more composite layer of (i) a vulcanizate encapsulated in a colored or uncolored thermoplastic polymer matrix containing one or more passivating agent and (ii) a reflective material chosen from colored fluidizable particles of a thermoplastic reflective colorant encapsulated vulcanizate, roofing granules
, thermoplastic encapsulated roofing granules
, the colored thermoplastic polymer matrix and combinations thereof.
OSHA personnel visited the plant, which turns the slag into blasting abrasives and roofing granules
, three times in the fall of 2015 in response to a complaint.
Known for their durability, reliability and accuracy of separation, GyraMax sifters are used throughout the world to handle the most demanding screening applications such as activated carbon, fertilizer, frac sand, limestone, petroleum coke, plastic pellets, PVC powder, roofing granules
, salt, sugar, and more.
But for a few surface blemishes, where there's only a shallow gouge or the roofing granules
have been rubbed off, try the simple cosmetic fix shown in Photos 1 and 2.
The glass that is produced is sold for blastcleaning media, aggregate filler, filter media, roofing granules
, cast glass shapes and insulation.
A layer of silicone coating is then applied with a silicone topcoat featuring imbedded roofing granules
. Installation was fast and caused no interruption to the building's normal operations.
It is estimated that about 44 percent of construction sand and gravel was used as concrete aggregates; 25 percent for road base and coverings and road stabilization; 13 percent as asphaltic concrete aggregates and other bituminous mixtures; 12 percent as construction fill; 1 percent each for concrete products, such as blocks, bricks and pipes; plaster and gunite sands; and snow and ice control; and the remaining 3 percent for filtration, golf courses, railroad ballast, roofing granules
and other miscellaneous uses.