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A blowing agent is a substance which is capable of producing a cellular structure via a foaming process in a variety of materials that undergo hardening or phase transition, such as polymers, plastics, and metals. [1] They are typically applied when the blown material is in a liquid stage. The cellular structure in a matrix reduces density ...
Maintaining a fireplace surround is relative straightforward. Simply make a habit of cleaning the fireplace surround with water and a mild cleaner to keep the stone free of dust, dirt, and soot ...
The basic concept of the gas-assisted molding process is quite similar to the regular injection molding process. In gas-assisted molding, the plastic material is injected into the mold cavities like the regular injection molding process but only up to 70%~80% of the mold volume. The melted plastic in contact with the mold walls begins to ...
Also available are firebrick "splits" which are half the thickness and are often used to line wood stoves and fireplace inserts. The dimensions of a split are usually 229 mm × 114 mm × 32 mm (9 in × 4 + 1 ⁄ 2 in × 1 + 1 ⁄ 4 in). [3] Fire brick was first invented in 1822 by William Weston Young in the Neath Valley of Wales.
In this way, the hottest gases are directed into the room that is currently being fired. Then the gases pass into the adjacent room that is scheduled to be fired next. There the gases preheat the brick. As the gases pass through the kiln circuit, they gradually cool as they transfer heat to the brick as it is preheated and dried.
In a fireplace, soot is deposited on the walls of the chimney. Soot particles are aerosolized within volatile organic compounds. These VOCs are in a hot and gaseous state, rising from the fire. When the VOCs come into contact with the walls, they cool, and change to the solid state, without formation of the liquid state.
Some contractors bring the mortar to the very edge, flush with the face of the brick. Others leave it recessed back to allow water to shed off the building. There are three types of recessed mortar: bucket handle, weatherstruck, and simply recessed. The bucket handle is when the mortar is in a curve shape away from the face of the brick.
It is now possible to buy "faux-brick" facades to cover these modern chimney structures. Other potential problems include: "spalling" brick, in which moisture seeps into the brick and then freezes, cracking and flaking the brick and loosening mortar seals. shifting foundations, which may degrade integrity of chimney masonry
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