The Importance of Quality & Consistency for Custom Gaskets

February 3rd, 2020 by

A rubber gasket is a mechanical seal that is used to fill the space between two or more mating surfaces during compressions. This crucial sealing component prevents unwanted gas or liquid emissions. They are intended to be resistant to pressure, temperature fluctuations, and in some cases, electrical or electromagnetic forces.


At Harkesh Rubbers, we manufacture custom rubber gaskets and custom rubber seals using a multitude of rubber gasket materials that include: EPDM, Neoprene, Silicone, Nitrile (Buna-N), Viton.


Custom gaskets are on-demand gaskets that are manufactured based on your specifications, tailored to your applications thereby making custom rubber gaskets the ideal solution.


Here are some ways in which custom-made gaskets offer additional benefits over pre-made gaskets:


1. Highly-efficient

It is integral for the gasket to match the exact needs of the system or product for which it is designed.Custom rubber gaskets are usually built matching the specific requirements of the business making them highly efficient.  If you want to be certain that your finished product is a seal that will operate under high stress and compression, a gasket designed to exact specs is the ideal choice. Custom rubber gaskets hold up to the test of time, use, and pressure that purchasers of your finished product demand.


2. Top-Notch Quality 

If you’ve tried custom-made products, you know that the wait is worth it. Because you order products based on your applications, you have a say on the quality you get. What is great is that you get to choose the materials you want to be used in making the gaskets meaning that you get the quality expected.The end result is superior quality systems and finished products that will make your business even more profitable.


3. Saves on Time and Money

As custom gaskets are designed according to your specifications to work with the existing systems, therefore requiring no need to test what will work and what won’t. A big advantage with custom gasket is that equipment failure is extremely rare. With Custom Gaskets, manufacturers don’t have to waste time and energy spent on making modifications. As a result, you end up saving money and time.


4. Customs Gaskets Designed for Every Industry

If you require custom-made gaskets for your equipment, Harkesh Rubber is your ultimate solution. Be it the medical, industrial, agricultural or small engine gaskets, Harkesh Rubbers has the equipment and experts ready to deliver quality.


Harkesh Rubber produces customs gaskets based on your specifications. Your business can benefit from Harkesh rubbers reduced production lead time and the significant savings we offer. Is your business looking for any type of gaskets? Contact us today at Harkesh Rubber.


What is a Viton® (FKM) Gasket & What are its Applications?

April 12th, 2019 by

Many of the most challenging sealing applications require a heavy-duty gasket that can perform exceptionally well in the harshest of conditions. Such applications often call for gaskets made from a family of fluoroelastomers called FKM. While Viton® is the generic name for FKM, it actually is a brand name of DuPont for its synthetic rubber and fluoropolymer elastomer.


What Exactly is FKM?

The FKM family of elastomers consist of copolymers or terpolymers of tetrafluoroethylene (TFE), vinylidene fluoride (VDF) and hexafluoropropylene (HFP), hexafluoropropylene (HFP) and vinylidene fluoride (VDF or VF2) and perfluoromethylvinylether (PMVE). Since DuPont was the first company to really market this material, its brand name Viton® has become the most commonly associated name with FKM.


Majority of synthetic rubbers are composed of long chains of carbon and hydrogen atoms. These rubbers are prone to swelling upon exposure to oil and have a limited temperature range. What’s more, they break down over time with UV exposure (through sunlight).


When fluorine is added to synthetic rubbers, it bonds tightly to the carbon atoms and makes the compound more resistant to other compounds while providing tremendous flexibility. This changes the properties of the material and makes FKM the high-performance rubber compound that is crucial to many applications.


FKM is known for excellent resistance to heat, chemicals, concentrated acids, oils, and aggressive fuels.


Material Grades for Viton® Gaskets

On the basis of material composition and applications, FKM comes in a number of different material grades. Some of these are:


General Use Grades:


Viton® A

Viton® A dipolymers are polymerized from two monomers – vinylidene fluoride (VF2) and hexafluoropropylene (HFP). It is the most widely used Viton® gasket material and has applications as rubber seals for aerospace and automotive lubricants and fuels.


Viton® B

Viton® B is a terpolymer, i.e. polymerized from three monomers – vinylidene (VF2), hexafluoropropylene (HFP), and tetrafluoroethylene (TFE). This material is primarily used in chemical processing, power industries, and utilities.


Viton® F

Viton® F is also a terpolymer, polymerized from three monomers – vinyl fluoride (VF2), hexafluoropropylene (HFP), and tetrafluoroethylene (TFE). F types offer the best fluid resistance out of all other Viton® types. They are extremely useful in applications that require resistance to fuel permeation.


High-performance Grades:


Viton® GB and GBL

Viton GB and GBL are fluoroelastomer terpolymers that are polymerized from three monomers – vinyl fluoride (VF2), hexafluoropropylene (HFP), and tetrafluoroethylene (TFE). These fluoroelastomers use peroxide cure chemistry that leads to a superior resistance to acid, steam, and aggressive engine oils.


Viton® GLT

This fluoroelastomer is specially designed to retain the high heat and chemical resistance properties of general use Viton® grades while improving the low-temperature flexibility. Also, Viton® GLT offers an 8 to 12°C lower glass transition temperature, which is indicative of low-temperature performance in elastomer applications.


Key Properties of a Viton® Gasket

When it comes to gasket materials, good compression set resistance or the ability to spring back after the load is taken off is needed. Other desirable properties include a wide temperature range and good chemical resistance. FKM offers exceptional performance in all these regards.


FKM is graded as ‘HK’ as per the ASTM D2000 standard for classifying elastomers. Here, H indicates that the performance of an FKM Gasket deteriorates very little after prolonged exposure to temperatures of 250°C (480°F). FKM also works well in low-temperature conditions going as low as -40°C (-40°F).


Whereas, the K indicates the resistance to swelling. Since K is the lowest possible rating, it means that FKM swells less than almost all other elastomeric materials. FKM is also highly resistant to chemicals and can withstand ozone, typical automotive fuels, and hydrocarbon lubricating oils. However, FKM doesn’t give as great results against strong acids, alkalis, and ketones.


Applications of Viton® for Rubber Gaskets

Viton® gaskets were first used in the aerospace industry owing to their fuel resistance and low burning characteristics. Now, their application can be found in fluid power, automotive, appliance, and chemical industries. Moreover, with the introduction of FDA grades, the uses of FKM have been extended to the food processing and pharmaceutical industries as well.


Viton® Gaskets are highly recommended for harsh, high-temperature environments. They are often used with lubricating and fuel oils, gasoline, vegetable oils, alcohols, diluted acids, hydraulic oil, and kerosene because of their chemical resistance. In addition, Viton® applications can also be found in fuel seals, cap seals, T-seals, and radial lip seals in pumps. FKM gaskets also offer superior UV resistance that makes them a great choice in applications where prolonged sunlight exposure is expected.


We hope that you found this information useful. If you’re looking for FKM or Viton® gaskets for your application, Harkesh Rubber manufactures top-of-the-line products to fulfil your sealing needs. In fact, we can produce low-temperature FKM gaskets that can withstand up to -50°C! Simply contact us for your Viton® gaskets needs.