Plastic is one of the more commonly used materials for prototyping. Product development engineers, production consultants, inventors, special project leaders, and retail and production prototype specialist turn to plastics to create their moldings and prototypes. This is all different types of plastics.

ABS : a terpolymer made from three monomers, acrylonitrile, butadiene and styrene. Acrylonitrile and styrene provide chemical resistance, butadiene adds impact resistance and makes the plastic suitable for furniture, computer housings etc.

Acrylic: a hard thermoplastic made from acrylic acid or a derivative of acrylic acid. Best known as a glass substitute, typically under the trade names Perspex, Lucite and Plexiglas.

Amino plastics: Plastics made from ammonia based compounds, namely urea formaldehyde and melamine formaldehyde.

Bakelite : really a trade name but frequently used as a generic name for phenol formaldehyde (phenolic).

Cellophane : A Du Pont trade name for film made from regenerated wood pulp (cellulose).

Cellulose : The fibrous matter in all plant cells, with a long chain molecular structure. The most common sources used for making plastics are cotton fibres and wood pulp

Cellulose acetate: A tough thermplastic made from cellulose in the form of cotton linters, treated with acetic acid and acetic anhydride. Used for many domestic mouldings such as spectacle frames, toothbrush handles, and as transparent packaging film.

Cellulose acetate butyrate: A thermoplastic made from cellulose treated with acetic and butyric acids. Transparent, opaque or coloured, with excellent moulding qualities, used where more moisture resistance and dimensional stability than cellulose acetate is required.

Copolymer: A plastic made by polymerizing two monomers, eg styrene and acrylonitrile .

Elastomer: A synthetic plastic with the flexible properties of rubber.

Epoxy resin: A very tough thermosetting resin used as a coating, or reinforced to make mouldings or laminates.

Ester : A compound produced by the reaction between an acid and an alcohol.

GRP : Glass reinforced polyester, ie polyester resin strengthened by glass fibres, making the resin, which has no strength of its own, into a very tensile material. Widely used to build boats, furniture and cars.

HIPS : High impact polystyrene

LLDPE : Linear low density polyethylene, a new type of low density polythene.

Melalmine : Melamine formaldehyde, a thermoset produced by reacting (triaminotriazine) with formaldehyde. A tough glossy plastic usually strengthened with a filler of wood pulp.

Monomer: A simple low molecular weight compound. Polymerization links monomers together to form high molecular weight polymers.

Nylon: Not one material but a group of very tough and flexible materials called polyamides. Thermoplastic and usually found as fibres or used solid, as gears, zips and more recently as dyed jewellery.

Phenolic: abbreviated version of phenol – formaldehyde. Phenolic is usually reinforced with a filler, but cast phenolic has no filler and can be translucent. It can be easily coloured and is used decoratively for jewellery, radio cabinets and all kinds of ornaments.

Polycarbonate : A very tough thermoplastic, usually found as a substitute for glass, eg: vandal proof telephone kiosks,bullet proof shields, baby bottles and picnicware.

Polyesters : Complex ester compounds which are thermosetting and can be polymerized at room temperature, eg GRP.

Polymer : Another word for a plastic material: one which has been made from chains of molecules of one or more monomers. Polymers (plastics) are organic substances, made from hundreds or thousands of molecules linked together in a repeating chain pattern (also known as macromolecules).

Polymerization : The chemical process of linking monomers to form new compounds called polymers. For example,ethylene is polymerized into polyethylene, (polythene for short).

Polypropylene : A thermoplastic polymerized from propene, very close to polythene in molecular structure, but harder, stronger and less flexible.

Polystyrene : A brittle.water white thermoplastic polymerized from styrene – (phenylethylene). The brittleness is overcome by adding some butadiene, which results in toughened polystyrene also known as high impact polystyrene (HIPS), a copolymer of butadiene and styrene. Expanded polystyrene is the rigid white foam used for packaging.

Infrastructures are carefully studied before they are even built. Everyone who is involved has a thing to say about the project and every concern in whatever aspect has to be discussed. The project team often headed by an engineer plan ever corner of the project to make sure that apart from finishing on time, the entire process will be smooth sailing and the finished product something that the team can be proud of. Once everything is settled and there is someone to finance the project already then the city engineer’s office approves the plan. With a new building or infrastructure or underway, everybody is on their toes not until the very last piece is completed. Therefore, government offices tasked to do regular check-ups and rounds to all establishments, roads, bridges and the like to ensure that there are still safe to use or occupy. The establishments and contracted companies have administration officers that do their own checking to make sure they pass the government’s tests.

One of the tools used in checking are industrial metal detectors. Industrial metal detectors are the devices used to look for any trace of presence of metal in nonconductive materials like textiles, rubber sheet, oils or liquids, plastics, powder, wood products and concrete. It is usually difficult to look for metal among these sorts of things but industrial metal detectors will do that job for you. Now the responsibilities of people do not end on the blessing of the new building or whatever it is that was built, it actually goes on forever. The infrastructure has to stand the test of time, weather and natural disasters. Certainly there will be accidents but hopefully as a result of careful planning and execution it will not be attributed to the infrastructure and the people behind it.

Important elements in an infrastructure that can be detected by an industrial metal detector include buried electrical lines, piping behind a wall or reinforcing metal bar in concrete. These are important because even if they are not seen, if these things go wrong then any infrastructure will be in danger. It is best to make sure that they are well in place and are functioning well. There are special industrial metal detectors like underwater metal detectors obviously for use underwater. An airport metal detector is also a special kind of industrial metal detector because these kinds of industrial metal detector usually have specifications unique to them.

Metal detectors are the sort of things that will catch the fancy of little kids wanting to be scientists. Science television series or movies always has a thing or two about magnets and how it is so cool that nails get attached to them or on a more complex note how magnets can actually move an entire land mass.
These sorts of things ignite a certain degree of curiosity to young kids watching which is actually good because that means there is a bright future to the world of science. As time goes by technology sets in and magnets are not just the U-shaped objects during science class. Now magnets can be part of a new device without being obvious like metal detectors.

Metal detectors are like magnets because these devices can detect metal objects like guns and anything else that should be detected that maybe parts of weapons of destruction whether small scale or big scale. The usefulness of metal detectors is the reason why establishments, big and small alike, invest in things like walk through metal detector doors or hand held metal detectors. Just like spy cameras, these metal detectors makes it more comfortable for the owner to ensure the safety of his or her customers.