by Nick Gromicko, CMI®
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material because of its superior ability to block heat and sound. Rockwool insulation is commonly used in building construction, industrial plants, and in automotive applications.Rockwool refers to a type of thermal insulation made from actual rocks and minerals. A wide range of products can be made from thismaterial because of its superior ability to block heat and sound. Rockwool insulation is commonly used in building construction, industrial plants, and in automotive applications.
The term &#;rockwool&#; is sometimes used interchangeably with &#;mineral wool,&#; although the latter term is, in fact, a larger category of thermal insulators that includes rockwool, slag wool and fiberglass.
Production
Rockwool is produced naturally during volcanic eruptions when high winds flow upon lava streams of basalt or diabase. This was the case when, in the early s, Hawaiian volcanologists found an unusual, wool-like rock fiber hanging from trees near Mount Kilauea, and it wasn&#;t long before the fiber&#;s exceptional qualities were discovered.
Today, this process is replicated in commercial furnaces where minerals and other raw materials are heated to roughly 2,910° F (1,600° C) and subjected to a current of steam or air. Oil is also added during production to decrease the formation of dust. More advanced techniques require rotating the molten rock at high speeds in a spinning wheel, resembling the way that cotton candy is made. Finished rockwool is a mass of fine intertwined fibers that are bound together with starch and used as loose fill or assembled into blankets (batts and rolls). The main producers of rockwool in the U.S. are located in North Carolina, Texas, Washington and Indiana.
Rockwool's Performance as an Insulator
The individual fibers that compose rockwool insulation are good conductors of heat on their own, but sheets and rolls of this insulation are efficient at blocking the transfer of heat. They are often used to prevent the spread of fire in buildings, in light of their extremely high melting point of 1,800° F to 2,000° F. With an R-value of 3.10 to 4.0, rockwool can play a significant role in reducing energy consumption in homes and businesses. Problems sometimes arise because rockwool can retain a large amount of water, although gravity will allow it to drain, as long as it has a path to escape.
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Common Applications
Safety
While many man-made mineral fibers are considered dangerous to humans, the danger is limited mostly to biopersistant materials, such as special-purpose glass wools and refractory ceramic fibers. The more common types of rockwool used as insulation are considered by the International Agency for Research on Cancer to be "not classifiable as carcinogenic in humans." Rockwool can cause skin irritation, although this condition is a temporary mechanical irritation, rather than a more serious chemical irritation. Regardless, it is always good practice for homeowners, inspectors and contractors to wear quality gloves and other personal protective equipment while handling rockwool, or any other insulation.
In summary, rockwool is a type of thermal insulation made from heated, naturally-occurring minerals. It is generally considered to be safe and effective.
ROCKWOOL (ROXUL Inc.) Terms and Conditions regarding Limited Warranty
Here at ROCKWOOL (ROXUL Inc.), we are committed to ensuring the highest standard of quality possible in everything we do. We are proud of our constant, consistent efforts to improve our operations to ensure we exceed your expectations on every product that leaves any of our facilities. As ROCKWOOL has no control over installation design and workmanship, accessory materials or application conditions, ROCKWOOL does not warrant the performance or results of any installation containing ROCKWOOL products. ROCKWOOL's overall liability and the remedies available are limited by the general terms and conditions of sale.
The limited warranty in the terms and conditions is in lieu of all other warranties and conditions expressed or implied, including the warranties of merchantability and fitness for a particular purpose.
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