D. V. Polymers India Private Limited
Patancheru, Hyderabad, Telangana
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Technical Information

Corrosion Introduction:

 

The gradual destruction of material, usually metals, due to chemical reaction with its environment. In an electrochemical reaction metals will get corrode resulting in metal loss as oxidation at the anode side and plating out of the metals at the cathode side. According to chemical engineers in an industry two types of corrosion happens to the metals with its interaction with electro chemical reaction they are general corrosion and localized corrosion.

The slow degradation of materials with the interaction of chemical and due to electro chemical reaction is known as generalized corrosion. In generalized corrosion there is a uniform loss of metal thickness. This degradation is usually measured by the loss of thickness and corrosion rate per year.

Localized corrosion usually confined to one area of at the area near to the joints of the metals or pipes fittings hence the name.  Localized corrosion usually classified into three types they are pitting corrosion, inter granular corrosion and crevice corrosion. The most damaging form of corrosion pitting corrosion is usually the corrosion of metals surface at the confined point or small surface. This type of corrosion usually takes place in the form of cavities. Inter granular type of corrosion requires a microscopic investigation and is the result tress. Inter granular corrosion is also known as Inter crystalline corrosion or inter centric corrosion. As the name suggests this type of corrosion usually takes place between grains or crystals. In Industrial terminology this corrosion is generally known as "inter granular stress corrosion cracking (IGSCC)". When the metal is corrosion resistant but the joints between the metals is ignored the most common corrosion is crevice corrosion. This corrosion is a result of localized attack on a metal surface at the gap or crevice between two joining areas.


About Fluoropolymers:


Discovered by Roy Plunk a research chemist at DuPont, Fluoropolymers are sell under the brand name Teflon by DuPont. Fluoropolymers has the ability to withstand chemical reactions at high temperature. Fluoropolymers are capable of withstanding chemical reaction at up to 260 Celsius. Fluoropolymers are selected on the basis of established criteria of required life, mean time between inspection, ease of fabrication, frequency of inspection, extent of maintenance and fabrication cost.

The end user often makes the decision based on the initial cost rather than the life cycle of the equipment however the decision should be made according to the life of the equipment.

Corrosion of Polymers:


The chemical structure of polymers makes it the most suitable candidate in the industry for applying it in preventing the corrosion of metals. The Polymers don’t get corrode easily by electro chemical reaction and processes. In the corrosion following descriptions are used cracking, blistering, chalking, swelling, discoloration. The metals in the industry gets corrode after experiencing electro chemical reaction at a specific rate but this is not the case in case of Polymers. Polymers don’t corrode easily or gets corrode rather very slowly.

About Selection of Polymers:


Fluoropolymers are fundamental to many metallic and non metallic materials in industrial and non industrial uses. The Selection of Fluoropolymers like any other component or material is usually degradation mechanism, its rate and criteria based on the expected life of the unit. The ability to fabricate the Fluoropolymers in the required shape is another consideration in its selection.

About Flouro Polymers

About Flouro Polymers:

After the introduction of Fluoro Polymers by US Research Chemist at DuPont, various researches suggest shows the importance of Fluoro Polymers in preventing the corrosion of metals. Fluoro Polymers are instrumental in building much equipment in industrial and household purposes. Fluoro Polymers are sold by various brand names by different companies and are classified according to melting point and chemical structure.

Poly Tetra Fluoro Ethylene (PTFE):

PTFE is a fluorocarbon solid, as it is a high-molecular-weight compound consisting wholly of carbon and fluorine. Due to its non reactive nature it is most commonly used in building the containers and pipe work for reactive and corrosive chemicals. At the normal temperature there are hardly few chemicals that may attack PTFE. PTFE is instrumental in making corrosion protected products. Applications in the automotive industry take advantage of the low surface friction and chemical stability using it in seals and rings for transmission and power steering systems and in seals for shafts, compressors and shock absorbers.

Fluorinated Ethylene–Propylene (FEP):

Fluorinated Ethylene–Propylene (FEP) is sold under the trade name Teflon® FEP by DuPont is a fully pollinated thermo plastic with some branching. FEP has a resistance to temperature at 375 F and after prolonged exposure to 400 F it experience changes in physical strength. The most common application of FEP is Medical Tubing, Telephone Primary wire coating insulation, laboratory equipment and coating for vessels.

Per Fluoro Alkoxy (PFA):

PFA is sold under the trade name Teflon® PFA by DuPont is a type of fluoro polymer with properties similar to PTFE. PFA is inert to Strong Mineral acids and is also inert to inorganic bases, organic acids, alcohols and salt solutions. The Oxygen atom at Branch in Chain helps in Thermal stability similar to PTFE and Increased melting helps in Upper Use Temperature similar to PTFE. PFA has a tensile strength and Flexural Strength of 73C and has a coefficient of linear expansion of 20 to 100 C. PFA is most commonly used in Chemical Equipment lining, Drum Liners and Foamed plenum wires.

About Selection of Polymers:

Fluoro Polymers are fundamental to many metallic and non metallic materials in industrial and non industrial uses. The Selection of Fluoro Polymers like any other component or material is usually degradation mechanism, its rate and criteria based on the expected life of the unit. The ability to fabricate the Fluoro polymers in the required shape is another consideration in its selection.

ETFE:

ETFE is a fluorine based plastic which is designed to have high corrosion resistance properties at high temperatures. The tensile strength of ETFE is 42 N/mm2 with a working temperature range of 89k to 423K. ETFE film is 1% of the weight of the glass, transmits more light and is less to install by 24% to 74%. The most common feature of ETFL is its resistivity; ETFE is resistible up to 400 times its own weight.

ECTFE:

ECTFE is part of fluoro polymer family. ECTFE (Ethylene Chloro Trifluoro Ethylene) is a fluorocarbon based polymer. ECTFE offers high impact strength, chemical and corrosion resistance over wide range of temperature ranging from - 76 degree to +150 degree. ECTFE have high resistivity and low dielectric constant. ECTFE is used to minimize wear in high-friction applications, where dimensional stability is a requirement.

Product Traceability

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Product Traceability and Testing:

As an organization adhering to all the international standards and procedures DV Polymers follows strong record of all the products in the system. DV Polymers maintains a strong trace of all the materials right from incoming goods to the finished goods. DV Polymers also maintains a separate log of the drawings of the materials and each drawing will pass through strict checks. DV Polymers procure the raw products in the form of Teflon, (PTFE, FEP, PFA and ETFE) from DuPont.  After procuring the product the respective raw material will be sent to the respective departments after entering into the log.

DV Polymers maintains a log of all the inventory by punching all the materials by the company name, serial number, batch number etc.  The finished products will also be maintained in the standard format of batch number, serial number and client name.

Testing:

DV Polymers follows a stringent set of tests for its finished products. The tests followed by DV Polymers are Visual, Dimensional, Tensile and Specific Gravity Test.

About Selection of Polymers:

Fluoro Polymers are fundamental to many metallic and non metallic materials in industrial and non industrial uses. The Selection of Fluoro Polymers like any other component or material is usually degradation mechanism, its rate and criteria based on the expected life of the unit. The ability to fabricate the Fluoro polymers in the required shape is another consideration in its selection.
 

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D. V. Polymers India Private Limited

D. V. Prasad(Managing Director)
17C, Part III, Phase I, IDA, Patancheru Medak District
Hyderabad - 502319
Telangana, India
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