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HDPE pipe is a type of flexible plastic pipe used to transfer fluids and gases. It is often employed for replacing aging concrete or steel main pipelines . Constructed from the thermoplastic HDPE (high-density polyethylene ), it has low permeability and robust molecular bonding, making it suitable for high-pressure pipelines .
HDPE is known for its high strength-to-density ratio. [4] The density of HDPE ranges from 930 to 970 kg/m 3. [5] Although the density of HDPE is only marginally higher than that of low-density polyethylene, HDPE has little branching, giving it stronger intermolecular forces and tensile strength (38 MPa versus 21 MPa) than LDPE. [6]
The CPSC warns against buying fireworks that are packaged in brown paper because it is a sure sign the fireworks were made for professional displays and could be dangerous for consumers to use.
The firework was tube-shaped and looked potentially like a pipe bomb, Nunley said. Investigators believe it was an isolated incident, he said. The Orange County Fire Authority said it responded to ...
Any fireworks that exceed these limits are not considered consumer fireworks and need an ATF license. The American Pyrotechnics Association maintains a directory of state laws pertaining to fireworks. One state — Massachusetts — bans the sale and use of all consumer fireworks, including novelties and sparklers.
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The salute may be fired on the ground (ground salute) or launched from a mortar as a shell (aerial salute). Due to the nature of the effect, large salutes are some of the more hazardous fireworks. Most of the "salutes" are made with flash powder. Flash powder has a fast burn rate, unlike black powder.
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