Plastic

Properties & Uses of PLASTIC Prepaid By: Mohd Rafiq Razali Nur Hazizi Amir Hamzah Nur Amalina Daud

Properties • Plastic properties are classified by 5 criteria. • These properties are subject to change due to temperature or humidity changes. • Therefore, it is necessary to account for changes in environmental conditions on selection of plastics.

• Mechanical properties • Mechanical properties refer to displacement or breakage of plastic due to some mechanical change such as applying some load. • Mechanical properties are dependent on the temperature, force (load), and the duration of time the load is applied. • It may also be affected by ultra-violet radiation when used outside.

• Thermal properties • Thermal properties include heat resistance or combustibility. • Thermoplastic has a larger coefficient of thermal expansion or combustibility and a smaller thermal conductivity or specific heat than other material such as metals.

Chemical properties • Chemical resistance, environmental stress crack resistance , or resistance to environmental change are referred as chemical properties. • When a plastic contacts chemicals, there is some kind of change. • After having a plastic in contacted with chemicals under no stress for about a week, changes in appearance, weight and size of the plastic are examined.

• Electric properties • Electric properties are also referred to as electromagnetic properties. • Electric properties include insulation, conductivity and electro-static charges. • Due to their good insulation property, plastics are often used in electric fields. • However, plastics do have a defect; they are easily electrified.

• Physical properties • Specific gravity, index of refraction and moisture absorption are called physical properties. • The specific gravity of the plastic is small, and it varies depending on the character of high polymer , or thermal and mechanical treatment of the plastic.

USES OF PLASTIC

• Plastics are "one of the greatest innovations of the millennium" (on the cover of Newsweek) and have certainly proved their reputation to be true. • It has been the most used material in the United States since 1976. There are a myriad ways that plastic is and will be used in the years to come. • The fact that plastic is lightweight, does not rust or rot, helps lower transportation costs and conserves natural resources is the reason for which plastic has gained this much popularity. Plastics are everywhere and have innumerable uses!

Packaging • Increasingly used in primary packaging by retailers and branded manufacturers for bottles and trays. • Household names such as Coca Cola, M&S, Boots, The Body Shop, Innocent Drinks and Halfords all currently use recycled plastic in selected product lines. • Use of recycled plastic helps demonstrate a commitment to sustainable resource use.

Construction • Plastic is widely used in mainstream construction products such as damp proof membrane, drainage pipes, ducting and flooring. • It is also used in innovative products such as scaffolding boards or kerbstones, where its durability and weight has significant Health & Safety benefits.

Landscaping • Walkways, jetties, pontoons, bridges, fences and signs are increasingly being made from plastic. • Durability, low maintenance, vandal resistance, and its resistance to rot are all key reasons for plastic being used.

Textile fibre / clothing • Polyester fleece clothing and polyester filling for duvets, coats etc is frequently made from recycled PET bottles (e. g. soft drink and water bottles). • Polyester fibre is the largest single market for recycled PET bottles worldwide.

Bin liners/refuse sacks • Plastic film from sources such as pallet wrap, carrier bags, and agricultural film are made into new film products such as bin liners, carrier bags and refuse sacks on a large scale.

Street furniture • Street furniture, seating, bins, street signs and planters are frequently made from plastic. • They are cost competitive and resistant to vandalism. • Local authorities and schools are able to demonstrate recycling in action by specifying recycled products.

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Sink stoppers: placing a plastic lid over a drain will create a vacuum and keep the water in sink or tub. Kid coasters: let the tykes monogram plastic lids to keep their glasses from getting mixed up and from sweating all over the table tops. Cupboard and refrigerator drip pans: shove one under your pepper mill to catch the excess pepper that sifts out the bottom. Ditto for honey containers and all those other drippy things in the fridge. Glue catchers: slip a lid under hot glue gun to catch drips.

• Plant coasters: not only will they catch leaks, they’ll prevent rings on furniture. • Non-stick pan scrapers: they’ll remove the yuck without damaging pan’s surface. • Hamburger separators: slip lids between shaped patties before freeze them, and then when it’s time to thaw them, they’ll be easy to separate. • Rust ring presenters: placing a plastic lid under shaving cream will prevent the bottom of the can from making rust rings on shower shelf or tub edge.

• Paint catchers: cut a hole in a lid, slip the handle of paint brush through it, and voila, a paint catcher thing. • Plastic garbage bag closers: cut a slit in a plastic lid and then feed the top of garbage bag through it for a securely closed bag. • Paint palettes: plastic lids are a great way to manage paints while doing those little craft projects. • Glitter and bead management: if using loose glitter or beads for a project, keep them under control with an inverted plastic lid.

INTRODUCTION

• Plastic surgery is a molding of the surface and sometimes deep structures of the human body. • Techniques developed in plastic reconstructive surgery have been adapted for the purpose of rejuvenation and aesthetic enhancement of the patients. • The plastic surgery has also been assisted by developments in the technology.

Ear PLASTIC SURGERY Materials : • Polypropylene • Metallic Wire. • Proplast. • Bioglass. • Stainless Steel. • Silicone Rubber.

• One of the material is Polypropylene or polypropene (PP) is a thermoplastic polymer.

• It is made by the chemical industry and used in a wide variety of applications, including packaging, textiles (e.g., ropes, thermal underwear and carpets), stationery, plastic parts and reusable containers of various types, laboratory equipment, loudspeakers, automotive components, and polymer banknotes.

• Polypropylene is unusually resistant to many chemical solvents, bases

• Polypropylene can be manufactured to a high degree of purity, making it useful for the semiconductor industry. • It is also resistant to bacterial growth, making it suitable for disposable syringes and other medical equipment. • It can be injection molded or fabricated (machined and welded). • Other applications are piping, filter material and plastic products that require a higher quality than

Properties of polypropylene • Light in weight • Excellent resistance to stress and high resistant to cracking (i.e. it has high tensile and compressive strength) - High operational temperatures with a melting point of 160°C

• Excellent dielectric properties - It is highly resistant to most alkalis and acid, organic solvents, degreasing agents and electrolytic attack. On the contrary is less resistance to aromatic, aliphatic and chlorinated solvents and UV. - Non-toxic - Non-staining - Easy to produce, assembly and an economic material