Search results
Results from the WOW.Com Content Network
Molded Bakelite forms in a condensation reaction of phenol and formaldehyde, with wood flour or asbestos fiber as a filler, under high pressure and heat in a time frame of a few minutes of curing. The result is a hard plastic material. [27] Asbestos was gradually abandoned as filler because many countries banned the production of asbestos.
Front cover of a brochure for Hatscheks Eternit Schiefer (asbestos cement roof tiles) Fibre-reinforced cement products were invented in the late 19th century by the Austrian Ludwig Hatschek . Principally he mixed 90% Portland cement and 10% asbestos fibres with water and ran it through a cardboard machine.
Pressed tin ceiling over a store entrance in Bellingham, Washington, U.S.A.. A tin ceiling is an architectural element, consisting of a ceiling finished with tinplate with designs pressed into them, that was very popular in Victorian buildings in North America in the late 19th and early 20th century. [1]
Oldcastle Materials Inc. is a supplier of asphalt, concrete, and other building materials, and also offers construction and paving services. The Atlanta-based company is a subsidiary of CRH plc, a publicly traded international group of diversified building materials businesses, [2] [3] and has approximately 18,000 employees at 1,200 locations, as of March 2018.
A slate roof in Cardiff, Wales A slate-faced church and homes in Wurzbach, Germany A fine slate tile work, Saint Leonhard's Church in Frankfurt am Main, Germany Slates with holes at a farm in Tremedda, Cornwall, England. Slate can be made into roofing slate, a type of roof tile which are installed by a slater. Slate has two lines of ...
They often resemble slate shingles and were mass-produced during the 20th century as these were more resilient to weathering than traditional slate shingles for the reason that slate is very soft and prone to weathering. Due to health risks of asbestos products, the European Union has banned all use of asbestos, including asbestos roof shingles ...
QAPF diagram showing the basanite/tephrite field in yellow TAS diagram with basanite/tephrite field highlighted. Basanite is an aphanitic (fine-grained) igneous rock that is low in silica and enriched in alkali metals.
The peg stops the slate slipping downwards, the weight of the slates above it hold the slate down. Later roofs replaced the peg by an iron nail driven into the lath, but the nail is always primarily a hook and it is the weight of the slates above that hold the roof covering down onto the frame.