Spinal Cord, Nerves, and the Brain. Communication central. The spinal cord is a tube-like structure filled with a bundle of nerves and cerebrospinal fluid, which protects and nourishes the cord. Other protectors of the spinal cord include linings called meninges and vertebral bones. The spinal cord is about an inch across at its widest point and about 18 inches long.
Thermoplastic elastomers (TPE), sometimes referred to as thermoplastic rubbers, are a class of copolymers or a physical mix of polymers (usually a plastic and a rubber) which consist of materials with both thermoplastic and elastomeric properties.hermoplastic elastomers show advantages typical of both rubbery materials and plastic materials. The principal difference between thermoset elastomers and thermoplastic elastomers is the type of cross-linking bond in their structures.
HDPE stands for high density polyurethane, a plastic product that is made from petroleum. Currently, about 4% of petroleum is used for the production of plastics.As an example of its production volume, in 2007 the global production of HDPE reached 30 million tons.DPE is a lot stronger than the standard polyurethane, it retains its solidity in room temperature and is an effective barrier against moisture. It is also not susceptible to rotting, is resistant to insects and is usually not eaten away by chemicals.