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The first expanded polystyrene ICF Wall forms were developed in the late 1960s with the expiration of the original patent and the advent of modern foam plastics by BASF. [citation needed] Canadian contractor Werner Gregori filed the first patent for a foam concrete form in 1966 with a block "measuring 16 inches high by 48 inches long with a tongue-and-groove interlock, metal ties, and a waffle ...
The Spanish Ballroom at Glen Echo Park features a sprung floor. A sprung floor is a floor that absorbs shocks, giving it a softer feel. Such floors are considered the best kind for dance and indoor sports and physical education, [1] and can enhance performance and greatly reduce injuries.
Marston Mat, more properly called pierced (or perforated) steel planking (PSP), is standardized, perforated steel matting material developed by the United States at the Waterways Experiment Station shortly before World War II, primarily for the rapid construction of temporary runways and landing strips (also misspelled as Marsden matting).
This type of flooring is typically used indoors and can be used in both high and low-traffic areas. It typically lasts for 15–18 years before it needs to be replaced. The quality of a carpet is usually measured in face weight, or how many fibers there are per square inch. The higher the face weight the more plush a carpet will feel. [3]
[24] The mat can be no thicker than four inches nor thinner than a mat which has the shock-absorbing qualities of at least 1-inch (2.5 cm) PVC vinyl-covered foam. Inside the outer circle is usually an inner circle about 10 feet (3m) in diameter, designated by the use of contrasting colors or a 2-inch-wide (51 mm) line.
EVA is one of the materials popularly known as expanded rubber or foam rubber. EVA foam [ 3 ] [ 4 ] [ 5 ] is used as padding in equipment for various sports such as ski boots , bicycle saddles, hockey pads, boxing and mixed-martial-arts gloves and helmets, wakeboard boots, waterski boots, fishing rods , and fishing-reel handles.