Engineering plastics, Mechanical Engineering

Assignment Help:

Engineering Plastics

In this time this has become clear to know, the plastics are utilized as engineering materials for machine parts, casting and bodies and for structure mainly due to low density though their strength is much less than such of metal. In the electrical engineering field the plastics are utilized caused their excellent insulating properties, normally measured in forms of dielectric strength in V/m. Their low melting point is a weakness or negative advantage and in a lot of applications the maximum employ temperature is a yardstick also. The impact strength of plastics is other important characteristic and in applications, here vibration is likely to arise plastics of low impact strength are not favored. The capability of plastics to be made in thin walled bags so foamed structure, in various colours and to be recycled or thermoplastics are added advantages. Their non-degradability has undoubtedly that provide ascend to problems of last applications and disposal, at this time they can be discarded via users in public places is to discouraging. Table no.1 illustrates a few plastics, their applications and properties.

                                                                                                                       Table no.1

 Sl. No.

Plastic

Density

(g/cm3)

Tensile Strength (MPa)

Iozed Impact Strength (J/m)

Dielectric Strength (V/m)

Maximum Use Temperature (oC)

Applications

1

Polyethylene Low Density High Density

 

0.92-0.93

0.95-0.96

 

6.0-17

20-37

 

-

21-748

 

18912

-

 

82-100

80-120

Corrosion resistant, Containers, Tubing, Houseware and Electrical insulation, Packaging film.

2

Rigid Chlorinated

PVC

1.49-1.58

50-68

53-400

-

110

Chemically resistant, Building material, Auto upholstery, Shoes, Suitcases, Refrigerator gasket, Electrical wire insulation.

3

Polypropylene

0.90-0.91

33-38

21-117

25610

107-150

Bottles, Laboratory ware, Packaging, Fan shrouds, Heater ducts, Battery housing in automobiles.

4

Styrene Acrylonitrile (SAN)

1.08

70-83

21-27

69935

60-104

Instrument lens and dash board components in automobile, Medical syringes, Blood aspirators, Blender and mixer bowls.

5

ABS

1.05-1.07

40

320

15169

71-93

Pipe and fittings in drain waste and vent of buildings, Business machines, Computer housing, Electrical conduits.

6

Polymethyl Methacrylate (PMMA)

1.11-1.19

76

123

18715

54-110

Transparent like glass, Good weatherability, Glazing in aircrafts and boats, Skylight, Exterior lighting, Advertising signs, Auto tail light, Protective goggles.

7

Polytetrafluoro ethylene (PTFE, Teflon)

2.19

7.0-9.8

133-210

17730

288

High chemical resistance, Chemical piping, Pump parts, Electrical components, Cable insulation, Non-stick cooking utensile lining, Bearing seals, Bushings.

8

Phenolic (wood flour filled/glass filled/mica filled)

1.34-1.95

5-18

10.6-955

10,000-

15000

150-288

Connectors, Electrical switch gear, Telephone relays, Adhesive in

plywoods and binder of sand in foundary.

9

Polyster

(glass filled)

1.7-2.3

5-18

425-1150

1200-

1400

150-177

Good corrosion resistance, Pipes, Tanks, Ducts, Automobile body parts, Small boat hulls.

10

Melamine

1.5

5-13

10.6-26.5

6700-

1500

77-200

Knobs and handles, Moulded dinner wares, Binder in particle board, Boat hulls, Flooring.

11

Epoxy (without filler, glass/ mineral filled)

1.06-2.0

4-30

10.6-55

10700-

22000

120-260

Protective and decorative coating, Primer on automobile bodies, High voltage insulators in Switchgears


          Notice: Materials from Sl. No. 1 to 7 such are thermoplastics and Sl. No. 8 to 11 such are thermosetting plastics.Along with filler thermosetting plastics are used.


Related Discussions:- Engineering plastics

Fuels and lubrication technology, minimum mass of air required for complete...

minimum mass of air required for complete combustion of the HFO

When was pddi developed, When was PDDI developed The PDDI interface was...

When was PDDI developed The PDDI interface was developed in connection with the ICAM project which was funded by the Air Force in order to improve the manufacturing methods in

Show the design of the control rooms, Q. Show the design of the control roo...

Q. Show the design of the control rooms? The design of the control rooms in any plant is very important. The control room operator(s) must be able to control and manage safety

Computer aided manufacturing, Computer systems to plan manage, and control...

Computer systems to plan manage, and control the operations of a manufacturing plant through either direct or indirect computer interface with the plants production resource

Determine the net rate of work output, A piston and a cylinder machine obta...

A piston and a cylinder machine obtains a fluid system, which passes through a complete cycle of four processes. In the mean while a cycle the sum of all heat transfer is 150KJ and

What do you mean by terms change of state, (a) Illustrate reversible, irrev...

(a) Illustrate reversible, irreversible and Quasi-static process with examples. (b) What do you mean by terms change of state, path, process, property, cycle. (c) Distinguish

Determine the actual absolute velocity, Question: As shown in the figur...

Question: As shown in the figure, the jet transport B is flying north with a velocity v B = 600 km/h when a smaller aircraft A passes underneath the transport headed in the 60

#Parallel Flow ., #Our company currently produces the evaporator fins and s...

#Our company currently produces the evaporator fins and screen. Production is planned to flow parallel evaporator. In this case we need more information.#

Explain the lip clearance angle - angle of drills, Normal 0 fal...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Manual metal arc-welding, Manual Metal Arc Welding Manual metal arc (MM...

Manual Metal Arc Welding Manual metal arc (MMA) welding, is a type of manual arc welding process that uses a consumable electrode coated with flux to lay the weld. An electric

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd