PLASTICS

Document Sample
PLASTICS Powered By Docstoc
					         ASSALAMUALAIKUM & GOOD MORNING




  FOR MUSLIM: ALWAYS FOLLOW THE WAY OF ISLAM COMPLETELY
FOR NON MUSLIM: ALWAYS SET GOAL BEFORE WORKING TOWARDS IT
PLASTICS
         TYPES OF PLASTIC
 There are 2 types of plastic that is:
 a) Thermoplastics
    - A polymer that softens ans melts gradually
      when heated and it can be reshaped when
      still warm.
  b) Thermosets
    - A polymer that can’t be reshaped after
      manufacture
              Thermoplastics
 polyethylene, polypropylene, polystyrene
  & polyvinyl chloride (PVC) most common
  thermoplastics
 Any object made from thermoplastic can be
  remolded into a new shape.
 Thermoplastics creep considerably more than
   thermosets, particularly at higher temperature
 Can be used for light structural properties
                Polystyrene
 has specific gravity of 1.05
 It tensile strength is low, less than 48.5 MPa
 Modulus of Elasticity is low
 has good water resistance and dimensional
  stability and inexpensive (cheap)
 But it possesses poor heat resistance, limited
  weather resistance.
 It is brittle and lacks toughness
 Pure polystyrene that is crystal clear used
  for storage container and cups.
 Polystyrene and expanded polystyrene used
  in tiles, packaging, containers, foams and
  housewares.
 Foamed polystyrene used in poured-in-
  place concrete wall systems & as insulation
  boards for foundation walls, masonry and
  wood walls and roofing.
Polystyrene Sheeting
In-situ concrete flooring on 300mm of Expanded
Polystyrene insulation.
Polystyrene Block ( Usage In Construction )
       Polyvinyl Chloride (PVC)
   Specific gravity about 1.39
   It’s made from monomer, vinyl chloride
   Tensile strength low nearly like polystyrene
   It’s an excellent insulator
   Used in raincoats and shower curtains
   Extensively used in floor tiles, electric
    cables, flexible sheeting, hoses, pipes,
    expansion joint filler, ,moldings, luggage,
    decorative wall coverings,
Multi-Lock Industrial Warehouse Floor Tile Made Using
PVC
PVC Vinyl Floor Tile
PVC pipe
              Polyethylene
 Specific gravity of 0.92
 Tensile strength very low, less than 13.8
  Mpa
 Modulus of Elasticity is very low
 It’s tough, weather-resisting plastic &
  durable
 Has excellent electrical properties
 Has favorable chemical resistance
 It’s common application is as polyethylene
  bags
 Polyethylene used in manufacture of films,
  sheets, pipings, tanks, foams, electrical
  conduit and moldings.
 Polyethylene films & sheets used as
  dampproof courses, membranes & curing
  membranes
Polyethylene Plastic
Polyethylene Bags
Product Made Using Polyethylene
             Polypropylene
 Has low specific gravity like polyethylene
 Low modulus of elasticity
 lightest material of all thermoplastics
 Has a higher softening point and shinier
 Good heat resistance but degrades under
  exposure to sunlight
 Has good abrasion resistance and hardness
 Used for pipes, sheets, geomembranes
Polypropylene Sheets Protector Pack
Geomembranes Made Using Polypropylene
Polypropylene Pipe Fittings
                 Acrylics
 Crystal clear in natural form
 has good weather resistance and ease of
  forming
 Tensile strength higher than other
  thermoplastic material
 Used in light fittings, skylights, screen
  doors, paints and adhesives
Acrylic
Acrylic Shower Base, Screen and Door
               Thermosets
 Most popular thermosets are unsaturated
  polyester, epoxides, phenol-formaldehyde
  and polyurethane.
 Polyester used in manufacture of fiberglass
  product and composite materials
 Phenol-formaldehyde used in lavatory seats,
  electrical fittings and equipment decorative
  laminates.
Rope Made Using Polyester
Beaker Made Using Phenol Formaldehyde
         Advantages Of Plastic
 It has high damping capacity ( ability to
  absorb part of the vibrational energy) that
  makes it suitable in application where
  vibration is encountered.
 Excellent water resistant.
  - It have low water-absorption properties
    making suitable as impervious membrane
    layers that could prevent movement of
    water. Application in foundation, water
    supply installation, for concrete curing
 It’s lower prices have contributed to the
  universal application of plastic. Low cost
 Plastics have a favorable strength / weight
  ratio. It has low density (less than half of the
  concrete and 1/7 steel)
 Since plastic is light, it present ease in
  handling, transportation, storage and assembly.
 Most plastics are generally maintenance free
  and have good corrosion resistance
 Thermal insulation of plastic is higher than
  other material.
  - used extensively as wall & ceiling insulation in both
    cast-in-place (as foamed insulation) and precast
    constructions (as rigid insulation)
 Plastics can be molded to any shape and pattern.
 Plastic products come in variety of colors & textures.
  - Manufactured plastics have good surface finish and
     may not require maintenance.
  - It’s availability in many color & texture makes it
    commonly used for floor, wall tiles & countertops.
 Plastics can be manufactured with consistent quality.
       Disadvantages Of Plastic
 It has low stiffness and strength which make
  it can be used for load bearing construction
   - It is subject to creep, that is the increase in
     deformation, under load, with time
  - Rate of creep of plastic higher than concrete
  - Creep deformation increases with stress level
  - Therefore, plastics become dimensionally
    unstable under load.
 Plastics are combustible/flammable material.
 Plastics emits toxic gases such as carbon
  monoxide during burning.
 Plastics may emit dense smoke, thereby
  making escape more difficult.
  - Shouldn’t be used in exits areas of building
   such as around stairways and corridors
 Expensive and subject to uncertainties arising
  for the oil price fluctuations.
 Acoustical insulation of plastic is poor.
            Modified Plastic
 Addition substances can be added to the
  plastic during manufacturing process to
  improve the properties of the plastic.
 Plasticizers to soften the plastic & make it
  easier for shaping.
 Antioxidants prevent degradation by light
  and heat.
 Colorants give color to plastic
 Fibers to improve strength of thermoplastic &
  thermosets
         Fiber Reinforced Plastic
 For application requiring very high tensile strength
 Fibers added not only increase stiffness & strength
  but also reduce shrinkage, improve abrasion
  resistance & provide dimensional stability to plastic
  resin.
 This is a light weight, high strength & corrosion
  resistance material.
 In civil engineering application for pedestrian
  bridges, bridge repair and as prestressing tendons.
ALWAYS SAY THANKS AS A SIGN OF APPRECIATION TO OTHERS WHO HELP YOU




                          GOOD LUCK

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:22
posted:8/4/2011
language:Malay
pages:36