Write the properties and applications of epoxy resin.

1 Answer

Answer :

Properties:

i) They have good chemical resistance.

ii) They have low shrinkage during curing.

iii) They possess good electrical resistance.

iv) These compounds can be used in solid and liquid form.

v) They have good adhesive property as they can be cured without application of heat.

Applications :- 1. Epoxy resins are best suited for bonding of insulating materials such as porcelain, wood, metal, ceramic, glass articles. 2. Laminates as well as insulating varnishes are prepared from epoxy resins. 3. A trade name for common epoxy resin type adhesive is araldite which is used in air-craft industry, automobiles, bicycles, golf club, snow boards etc. 4. Due to their electrical resistance they are widely used in making insulators, bushings etc. for high voltage. 

Related questions

Description : Write four properties and four applications of urea formaldehyde resin.

Last Answer : Properties: 1) The bond film produced by Urea - Formaldehyde resin is quite rigid & transparent. 2) It is good resistant to moisture, insects & fungi. 3) However action of acids & alkalies ... 3) Used as bonding articles in aircraft. 4) Used as bonding articles in ship building industries etc.

Description : Give the applications of phenol formaldehyde resin.

Last Answer : 1) For making electric insulator parts like switches, plugs, switchboards, heater-hands, sockets for light bulb, etc. and in wire insulation. 2) Used for making moulded articles like telephone parts, ... ) In paints and varnishes. 7) It is used as hydrogen- exchanger resin in water softening.

Description : Write two applications and two properties of Rose metal.

Last Answer : Properties: 1. It is easily fusible alloy. 2. It’s melting point is 89 0C. Applications: 1. It is used for making fire – alarms, fuses wires. 2. It is used for casting dental works 3. It is used in automatic sprinkler system.

Description : State composition, properties and applications of Tinmann’s solder

Last Answer : Composition, properties and applications of Tinmann’s solder :

Description : Describe metal spraying process for protection of metal from corrosion .Write its two applications.

Last Answer : Process:- i) In this method, coating metal sprayed on the surface of base metal with the help of spraying gun or pistol. ii) The spraying gun consist of a duct for compressed air and is fitted with the oxy- ... 4) Coating of metals like Al, Zn, Ni, Sn, Pb etc. is made by the method of spraying.

Description : Write two applications of copper.

Last Answer : 1) For making electrical wires, cables and conducting apparatus. 2) As a coinage metal and in ornaments, jewelry for making them hard. 3) For making water stills, kettles, vacuum pans, steam pipes ... such as hypsometers, colorimeters, etc. 7) For making alloys like brass, bronze, gun metal, etc.

Description : Write any two applications of silicon fluid. 

Last Answer : Applications:- 1) As a lubricant: excellent lubrication for plastic and elastomeric surfaces. 2)In polishes and chemical specialities: It is used in automobile and furniture polishes due to its high ... ,non-toxic , non-carbonizing moulds release for rubber, plastics and metal die castings. 

Description : Describe the tinning process. Write its two applications.

Last Answer : Tinning: -The process of covering iron or steel sheets with a thin coat of tin to prevent it from rusting is called as tinning.   Process: i) The sheet of steel to be ... Tinned copper sheets are used for cooking utensils and refrigeration equipment. Cu tubes are used in refrigeration. 

Description : Write two applications of Teflon

Last Answer : Applications of Teflon: i) Teflon used as capacitor dielectrics & insulating material for all kinds of windings. ii) Heat resistant materials are prepared by combining Teflon with glass cloth. iii ... . vii) Teflon coating is applied on vehicle to protect them from corrosion and scratches. 

Description : Write two applications of aluminum

Last Answer : 1) For preparing utensils, surgical instruments, heating appliances, parts of aeroplanes, containers for chemical industry etc. 2) For making electric wires and cables for transmission lines. 3) ... storing nitric acid. 13) As refractory for lining of furnace and for making refractory bricks.

Description : Write two properties and two uses of Bakelite.

Last Answer : Properties Uses Hard,Rigid,strong,scratch resistant & brittle material. insulation of electrical wires & cables electrical switches, switch board sockets, plugs for ... Rolling mills, Decorative laminates wall covering & industrial laminates for electrical parts. 

Description : Which of the following polymers shows the highest anti-tacking properties? (A) Melamine formaldehyde resin (B) Phenolic resin (C) Epoxy resin (D) Alkyd resin

Last Answer : (A) Melamine formaldehyde resin

Description : What are applications of sherardizing process?

Last Answer : Applications:- i)Sherardizing is used especially for protecting small odd shaped steel articles like bolts, screws, nuts, threaded parts washers, valves, gauge, tools etc.against atmospheric corrosion. ... has crevices or depression and there is practically no change in the dimensions of articles.

Description : State two applications of lead acid storage cell.

Last Answer : Applications of lead acid storage cell: 1. Lead acid storage cellis commonly used in automobiles. 2. To Supply current for electric vehicles 3. In Gas engine ignition 4. In telephone exchanges ... hospitals 7. In broad casting stations, power stations 8. For distribution work 9. In inverters

Description : Define photo conductive polymer. Give its examples and applications.

Last Answer : Photo conductive polymer: These are the polymers which conduct electricity only in the presence of light. Examples: i) PVK or poly(N-vinyl carbazole ) ii) Poly (vinylpyrene),iii) poly(2- ... resistors are often used include camera light meters, street lights, clock radios and infrared detectors.  

Description : State two properties and two uses of silicone fluids.

Last Answer : Properties :- 1. They can be used in temperature range of -90 0C to 220 0C 2. They have excellent dielectric properties over a wide range of temperature 3. They have ... release material: an odourless, non-toxic, noncarbonizing moulds release for rubber, plastics and metal die castings.

Description : Define paint. Give its two properties

Last Answer : Paint: - Paint is a mechanical dispersion mixture of one or more pigment in a vehicle. Properties of paint: 1) Paint imparts opacity and colour to the surface on which it is applied. 2) It ... and weather. 4) Paint imparts luster, gloss and durability to the surface on which it is applied.

Description : State the properties of liquid crystal polymer.

Last Answer : 1) They have high mechanical strength at high temperature. 2) They are extreme chemical resistance. 3) They have good weatherability. 4) They are inert. 5) They resist stress, cracking in the ... temperatures. 6) It has high coefficient of thermal expansion. 7) It is highly resistant to fire.

Description : Write the action of Nitric acid on Aluminium.

Last Answer : Aluminium metal does not react with dilute as well as concentrated Nitric acid 

Description : Write two characteristics and two uses of Ni-Cd battery.

Last Answer : Characteristics: 1. The e.m.f. of cell is 1.4 V when fully charged. 2. It has low internal resistance & longer life span (5 years). 3. It is expensive in cost. 4. It can be ... lighting and air conditioning because of its long life & low maintenance cost. 3. It is widely used in calculators.

Description : Define specific conductance. Write its unit.

Last Answer : Specific conductance is the conductance offered by 1 cm3 of the substance or 1ml solution.  OR The conductance offered by a solution or a conducting material having unit length & unit area of cross ... conductance. Unit of specific conductance: ohm-1 cm-1 or mhos-cm-1 or S.cm-1

Description : Write the action of water on Aluminium.

Last Answer : Pure aluminium is not affected by pure water. However, impure aluminium is readily corroded by water containing salts (seawater). It decomposes boiling water with evolution of hydrogen.

Description : Write the mechanism of corrosion of metal due to action of oxygen.

Last Answer : Mechanism: Metallic surfaces when exposed to air undergo oxidation and the process of corrosion is represented by the equation.   A thin oxide layer is formed on the metal surface and the nature of this film decides further action depending upon the film so produced.   

Description : Write any four uses of aluminium.

Last Answer : 1) For preparing utensils, surgical instruments, heating appliances, parts of aeroplanes, containers for chemical industry etc. 2) For making electric wires and cables for transmission lines. 3) ... furnace and for making refractory bricks. 14) For preparation of mirrors for telescope

Description : Write the different types of oxide films formed on the metal surface. Explain the oxide film which is more protective against corrosion.

Last Answer : Types of oxide films 1. Stable porous oxide film 2. Stable non porous oxide film 3. Unstable oxide film 4. Volatile oxide film i) Stable nonporous oxide film ii) Unstable oxide films are protective ... . Example: - Such type of oxide film is formed in the metals like Ag, Au, and Pt.

Description : Write four characteristics of good paint.

Last Answer : i) It should be able to resist the atmospheric conditions. ii) It should have desired consistency. iii) It should have high hiding power. iv) Its film should be washable. v) Its film ... adherent, durable and glossy film.  vii) When paint is applied on a metal, it should resist corrosion.

Description : Define adhesive. Write two characteristics of Adhesive.

Last Answer : Adhesives- Any substance which is capable of holding the materials together by surface attachment is called as an adhesive Characteristics:-  i) Adhesive should form rigid, strong and durable bond. ii ... the adhesion property on storage. v) It should be resistant to heat, chemicals and water.  

Description : Write any two examples of sacrificial anodic protection.

Last Answer : Examples: 1) To protect buried water or gas pipelines. 2) To protect buried cables. 3) To protect hot water tank, etc. 4) Mg or Zn rods are bolted along the sides of ship, hot water ... protect open water box coolers. 6) To protect water tanks. 7) To protect transmission line towers, etc. 

Description : Define atmospheric corrosion. Write mechanism of atmospheric corrosion with diagram.

Last Answer : Atmospheric corrosion: This type of corrosion occurs when metal surface comes in immediate contact directly with atmospheric gases like O2, Cl2, Br2, I2, H2S, CO2, SO2, NO2 etc.

Description : Write any two advantages of Adhesives.

Last Answer : i) Adhesives have an advantage of joining material such as glass & metal, metal metal, metal & plastic, plastics-plastic, ceramic & ceramic. ii) Surfaces are easily & rapidly attached to each ... are leak proof for gases & liquids. So adhesive bonding is used in preparing water tight wood boats

Description : Define the term equivalent conductance. Write its unit

Last Answer : Equivalent conductance (λv): It is the conductance of the solution containing 1 gm equivalent of solute / electrolyte when placed between two sufficiently large electrodes 1 cm apart. Unit: ohm-1 cm2 / equivalent OR mhos.cm2 /equivalent 

Description : Write two application of metal cladding process.

Last Answer : Applications : 1) Al clad sheets used in aircraft industry in which a plate of duralumin is sandwiched between two layers of 99.5% pure Al. 2) Cu clad steel wire is obtained by ... cu-tube is used for electrical conductors possessing combining strength of steel with the high conductivity of Cu.

Description : Write the action of Conc. HNO3 on Aluminium metal.

Last Answer : Aluminum metal does not react with dilute as well as concentrated Nitric acid.

Description : Write two points of similarity between sherardizing and galvanising process.

Last Answer : 1) Sherardizing and galvanizing are the processes of avoiding corrosion of metal. 2) Zinc is used as coating metal on iron base metal.

Description : Write the action of water on copper.

Last Answer : Water at ordinary temperature has no action on copper. If it is heated to white heat, steam gives Cupric oxide.

Description : Is it possible to treat a stretchered canvas with polyurethane, epoxy resin or some such, to make it waterproof enough to hang over the bathroom shower?

Last Answer : answer:If you put on enough coats to be certain that there weren't any untreated areas, no matter how small, I don't see why not. Isn't this what they do with fiberglass coatings to make ... to boating people and ask them what they would recommend. Is this an Acrylic painting you're talking about?

Description : What do you think about my using epoxy resin coating and flooring in all areas of my home and office, and why?

Last Answer : If the epoxy resin coating works well and safely, it should be fine. As long as the walls won't fall apart or aren't 'peeling' away. But check out the ingredients/chemical fumes of the epoxy that might affect your health. Open the windows at all times.

Description : Are epoxy resin countertops scratch proof?

Last Answer : Epoxy resin can be used as a sealant on counter tops to help make them resistant to scratches. There are no countertops made of epoxy resin

Description : What are the advantages of epoxy resin as a fixative?

Last Answer : Expoxy resin is very stable and that is exactly what you need in a goo fixative. The last thing you need is an unstable mix of chemicals,that can end in disaster. The advantages of epoxy ... it is durable, long-lasting, and inexpensive. Epoxy resin also resists cracking, unlike many older adhesives.

Description : Polyhexamethylene adipamide is also known as (A) Bakelite (B) Nylon-66 (C) Epoxy resin (D) Silicone rubber

Last Answer : (B) Nylon-66

Description : Which of the following polymers are produced by employing all bulk polymerisation, solution polymerisation & suspension polymerisation technique of addition (chain) polymerisation (A) PVC (B) Bakelite (C) PTFE (D) Epoxy resin

Last Answer : (A) PVC

Description : Which of the following is a polymer of Hexamethylene diamine and adipic acid? (A) Nylon-6 (B) Nylon-66 (C) Nylon-6, 10 (D) Epoxy resin

Last Answer : (B) Nylon-66

Description : Epoxy resin is (A) Not used for surface coating (B) A good abrasive (C) An elastomer (D) A polyester

Last Answer : (B) A good abrasive

Description : __________ scrap can be recycled & reutilised. (A) Bakelite (B) Epoxy resin (C) Polythene (D) None of these

Last Answer : (C) Polythene

Description : Polycondensation of saturated dicarboxylic acid with polyhydric alcohol produces (A) Epoxy resin (B) Polyamide (C) Alkyd resin (D) Phenolic resin

Last Answer : (C) Alkyd resin

Description : Polymerisation product of C2F4 (carbon tetrafluoride) is called P.T.F.E. (poly chloro tetra fluoro ethylene). It is also called (A) Polyurethane (B) Silicone rubber (C) Teflon (D) Epoxy resin

Last Answer : (C) Teflon

Description : Cation exchange resins used in water treatment is made from __________ resin. (A) Urea formaldehyde (B) Epoxy (C) Amino (D) Phenolic

Last Answer : (A) Urea formaldehyde

Description : __________ practically possess no elasticity. (A) Vulcanite or ebonite (B) Spandex fibre (C) Polysulphide rubber (D) Epoxy resin

Last Answer : (A) Vulcanite or ebonite

Description : Epoxy resin is a polymer containing two or more groups of the bellow fig. is called epoxide group or ethoxyline group. It is a (A) Polyamide & an elastomer (B) Good adhesive (C) Surface coating agent (D) Both (B) and (C)

Last Answer : (D) Both (B) and (C)

Description : Epoxy resin (A) Is a good adhesive (B) Is an elastomer (C) Cannot be used for surface coatings (D) Is a polyester

Last Answer : (A) Is a good adhesive