Caskets are mostly nailed shut, or screwed into place.
Some higher end metal caskets have a rubber gasket that seals the casket when the lid is closed and locked down. These type's of caskets do not protect the body from decomposition. In fact, it will actually speed up the process substantially. You can find more information on the controversy by searching for "sealer caskets controversy" on Google.
Only those caskets are air (and water) tight which are "sealer" caskets, meaning that they are provided with a rubber like sealing gasket between the lid and the base of the caskets. Usually only metal caskets can be sealer caskets.
Probably some years after the Second World War. Before that, usually rather expensive glass sealer caskets were used if a "protective" casket was requested. After the war, the Batesville Casket Company pioneered the use of reasonably priced gasket sealer caskets.
Probably because steel caskets (or caskets made of other metals) can be sealed hermetically, meaning that they can be made airtight and watertight, which is requested for long distance shipments of remains.
Only those caskets are air (and water) tight which are "sealer" caskets, meaning that they are provided with a rubber like sealing gasket between the lid and the base of the caskets. Usually only metal caskets can be sealer caskets.
"Glass sealer" caskets (protective caskets with an inner glass lid) are an older type of "sealer caskets" (caskets providing an air and watertight seal). Later (for example in the Gulf War) the remains of soldiers were shipped back in glassless "gasket sealer" caskets.
One can find caskets for sale at mortuaries and funeral supply stores, for example Costco. Caskets are also for sale at Sears, Walmart, and Caskets By Design.
Usually yes - as long as one compares caskets of similar design, similar thickness of wood and similar interiors.
In the United States, standard caskets for adults have a length between 80 and 83 inches. Industrially manufactured oversize caskets are up to 96" long. Hand crafted caskets can be even longer.
For metal caskets usually a crank. With old style wooden caskets, the lid often has to be unscrewed.
Hands on History - 2001 Caskets was released on: USA: 23 October 2004
Metal caskets are available in carbon steel, copper, bronze, and stainless steel. Carbon steel caskets are available in different gauges, ranging from 20 gauge (the thinnest) to 16 gauge (the thickest)
Not always and never in countries where the graves are used over again. In the US the practice of placing the caskets in concrete (or metal) containers is very common although there is no law requiring it. Many cemeteries demand grave liners or burial vaults (hermetically sealed grave liners) to prevent the grave from caving in when heavy machinery is used on the lawn or when wooden caskets deteriorate.