What Makes Cryogenic Deflashing Method a Cut Above The Rest?

Before the final inspection and packing, moulded rubber parts must undergo a finishing process to remove excess flashes. “FLASH” is an excess amount of rubber that oozes out between the two halves of a mould during the moulding of rubber parts.


The flash occurs in areas where different sections of the mould join together and are called the ‘parting line flash’. The remaining part of the mould flash traces around where the different sections of the mould join together.


Flashes cannot be avoided no matter what technique has been used to manufacture these rubber products. While manufacturing high-performance materials for growing markets like electronics and automotive, intricate finishes, consistency and strict tolerance must be met.


Importance of Cryogenic Deflashing



This is the only method that makes it possible to eradicate complex flash at the inner dimensions. Parts with a thin flash can be removed through cryogenic deflashing quickly. The traditional deflashing methods generally deliver a poor deflashing effect as it is done manually with the help of blades, scissors or knives. The manual trimming method has a high variability in quality and the production rate due to the geometry of the parts. Since the finish quality is not up to the mark, it leads to high rejection rates. Unevenly deflashed products when used can affect and damage the machine it is used in.


The Process of Cryogenic Deflashing



Cryogenic Deflashing is a combination of rapid rotation, nitrogen and plastic blast media is used to get rid of the flash in an extremely precise and economical way. The rubber parts are arranged in a perforated container which is then inserted in a blast enclosure.


The containers rotate and evenly expose all sides towards the blast media. The enclosure is insulated with firm polyurethane foam for stable temperatures. The liquid nitrogen decreases the temperature inside and freezes the flashing to make it fragile.


With the use of pure nitrogen with zero moisture the requirement of a dryer is eliminated. A fast-moving impeller shoots the polycarbonate pellets in the container. These high-speed pellets trim the inner as well as the outer diameter flashing neatly in a single operation. The effective lubricity and hardness lessens the impeller’s wear and increases its durability.


Parting- line flash thickness determines the capability of the system to finish the moulded part in concurrence with the cycle time and LIN consumption. A thicker flash is more difficult to get rid of and requires lengthier deflash cycle time which results in higher LIN consumption. The optimum parting-line flash thickness is 0.001” to 0.005”. Optimum finish quality and LIN consumption are based on the mould design and condition.



Advantages of Cryogenic Deflashing



Cryogenic deflashing offers numerous advantages over other traditional or manual deflashing methods:


● This process maintains an element of integrity and precision and ensures greater productivity.

● Due to this using a batch process, the cost of per piece is lesser as the number of parts processed in a specific time increases. This makes the manufacturing process economical and cost-efficient.

● Repairing or replacing a mould rises up the expenses bracket. In this method, the moulds can bede-flashed which extends their durability.

● It delivers consistent results in every lot.

● This technique is completely non-abrasive.

● The entire procedure is highly automated which eliminates the need of a human operator.

● This method eradicates the use of any toxic chemicals and is enclosed to a minimum sound which proves it to be environmental-friendly.


Harkesh Rubber uses cryogenic deflashing which is the most advanced deflashing process, unlike most of the other OEM’s. This method polishes the parts (typically O-Rings) and minimizes any sign of the flash or parting line delivering an efficient and precise product.


With this process, we ensure precision and fulfill our commitment of delivering a quality product. This technique not only improves the performance of the product but also saves the time and effort invested which eventually reduces the cost of production as well.

Case Study – Special EPDM Compound Diaphragm for Aircraft Engine Application


The Client is an established Control Valve Manufacturer from America.




The vendor who provided the rubber seals for the client for almost 5 decades was acquired by the competition. Since the vendor had to comply to military secrecy, they stopped sharing the information with the client regarding the base polymer, physical properties required, and other necessary details.


This put the client in a fix as they did not have the required details about the parts supplied by the vendor. They also needed to manufacture a special diaphragm to support a huge military account in the USA.




Harkesh Rubber came in contact with the valve manufacturer. Since we had the experience to meet their moulding requirement, we soon figured out the need to develop a suitable compound formulation for this application.


Once we took the feedback from the customer regarding the application and approval tests required, we determined that the compound needed to work in Aviation Turbine Fuel. After that, we selected the EPDM material for the application. We also reviewed the old material test certificates of the previous vendor and deciphered the special needs the compound would require, like the use of silicone oil and very high elongation.




With our analysis and research, we developed a special EPDM compound that was suitable for work in Aviation Turbine Fuel at high temperatures and with a work cycle in excess of 10,000 hours. We created diaphragm samples from the compound and supplied them to the client. They assembled the components and delivered them to the leading Aircraft Engine Manufacturer. Once the trials were conducted over a year, the diaphragm and the compound were approved.




The client was able to retain their account with the leading Aircraft Engine Manufacturer.


Since 1982, we have built a reliable reputation in the rubber industry on our unique solution based approach that has made us the preferred partner for critical sealing solutions. We provide high precision, cost-effective sealing solutions for technically demanding applications.

The Significance Of O-Rings For Sealing Solutions

Since the first one was registered in 1896, it won’t be wrong to say that o-rings were one of the oldest inventions! This ring-like designed loop helps in the prevention of gases or liquids. It is known to be one of the easiest precision mechanism objects ever manufactured and they continue to be the most widely used products for sealing solutions.


The production of o-rings requires carious manufacturing techniques like compression moulding, transfer moulding, extrusion, injection moulding or machining. As per the application requirements they can be made using different rubber materials. While designing o-rings a number of factors need to be kept in mind like the cost, quality, quantity, sealing pressure, application temperature, movement, chemical compatibility, lubrication, action and much more.


In some scenarios, o-rings are required to be exposed to tremendous heat or toxic chemicals. This is why different materials are used to make o-rings to fit the requirements depending on the application. Similarly, the o-ring sizes may vary according to the usage requirements.


O-rings are basically used to place into a groove for it to hold the air or fluid in place and then squeeze it between the two surfaces. When this action is performed, the pathway where the air or fluid is escaped from is blocked. The speciality of a rubber o-ring is its muscle-memory, which means it goes back to the original shape. This feature is what helps o-rings function with sealing under low or no pressure. When pressure is applied, the o-ring is squeezed in opposition to the wall of the groove which forces it to expand in the opposite direction. This technique helps o-rings perform the sealing function against the ends of the groove.


There are a number of industries that extensively use o-rings. Some of these are listed below:


1) Aerospace:


The aerospace industry is highly dependent on o-rings. They need to use o-rings with the design and material which provide flexibility to fulfil their demands. Extreme temperatures and radical fluctuations in temperatures are a few concerning conditions in the aerospace industry. The utilization of o-rings is done for hydraulic systems, landing gear systems, gas turbine engines, braking and many such purposes.


2) Automation:


The various automobile products are of different natures. They consist of gas and liquid, refrigerant gases and liquids and lubricant oils of various nature. Adding to these is the difference in temperatures. To these, we must add the dissimilarities in the different temperatures that the fluids are put to work in along with the speed that can vary the exercise conditions. O-rings are of great use for the braking circuits, lubricant circuits and the air-conditioning systems.


3) Oil & Gas:


he oil and gas industry portray extreme conditions which need the o-rings to operate in these conditions accordingly. The mechanical, fluid phase and thermo-chemical conditions need to be accommodated in order to maintain the required integrity of the o-rings. They are required to be resistant to sour gas, explosive decompression, aggressive chemicals and extreme temperatures.


4) Chemical Processing:


The applications in chemical processing industries are often critical. Besides the wide chemical resistance in o-rings, the resistance to the difference in changing temperature also holds great importance. They requisite to have the ability to eliminate cold flow and drift and are able to pass over the portholes without any damage.


5) Food & Beverage:


The food and beverage industries require o-rings to be able to withstand the thermal and chemical environments that are present in the equipment. They also need to hold back any unknown or unwanted contaminants in the process. Since they may come into contact with consumption items, these o-rings need to be capable of remaining hygienic and receive an effective bacterial treatment while they still maintain their physical properties.


Sealing solutions among all kinds of industries require o-rings in various forms for different applications as per their custom requirements. We manufacture o-rings that are capable to resist high temperatures and pressures that do not bulge and are flexible and suitable for all kinds of environments.

Custom Seals That Provide Trusted Results for the Automotive Industry

The exteriors and interiors of the automotive transit vehicles portray a variety of sealing challenges. In many cases, the o-ring does not suffice as a definite sealing solution, which can prove to be fatal. And that itself cannot be allowed to happen since people invest their trust in automobiles with their life.


Therefore, Harkesh Rubber with their specialized technical skills and empowered knowledge about the industry manufactures customized rubber seals as a solution to these common problems.  We make sure that the custom seals are of the highest quality with equal priority given to each of them individually.


Oil Seals:


The oil seal is an element used for excluding dirt, dust, water or other such contaminants while retaining the lubricity in the rotary shaft equipment. It is extremely useful as it offers protection to the bearings of rotating shafts. The basic principle of an oil seal is that the flexible rim is held against the rotating section while the shell is pushed into the cover as it confines it. The sealing edge requires some manner of lubrication to evade overheating and is frequently energized with the help of a garter spring.


There are the two main types of oil seals:


  • Dynamic Oil Seals


Dynamic oil seals are used between surfaces that have relative motion, such as, a shaft and a case. The dynamic oil seals keep gases and liquid in and prohibit contaminants. Oil seals should be smoothly placed against the moving parts to reduce surface wear and provide minimal friction or drag.


A seal is selected after taking the chafing speed, operating temperature, fluid pressure, space available and the shaft surface requirements into consideration. A few dynamic seals like the piston rings are designed to endure extreme pressure, while others seal against little pressure. Seals that are used around rotating shafts in an engine are known as radial positive contact seals.


Dynamic seals that are used in automotive engines are generally made from rope packing or synthetic rubber. Rope packing is the less expensive type of dynamic seal and has incredibly low friction and wear characteristics.


Lip-type dynamic seals that are used in automobile engines are prepared from synthetic rubber. They have the ability to withstand additional shaft eccentricity and run-out when compared to the rope type seals. They are capable of operating at higher shaft speeds. However, they need a finer shaft finish for a longer sealing life. Lip seals put more load on the shaft than the rope type seal.  Therefore, they seal in a better way.


  • Static Oil Seals


Static oil sealing is the operation against two surfaces that have no relative motion between each other. Depending on the direction of compression, static seals can be either axial or radial. In accordance to the working pressure, it can be divided into low voltage static sealing and high-pressure static sealing.


In a static sealing function, they are located in a groove and there is no movement between the sealing surfaces or between the seal surface and its mating surface. Static oil seals are the universal sealing elements that impress with easy installation, small footprint, and versatile application. Due to these qualities and convenience, they are used frequently.


Examples for static oil seals include seals for plugs, flanges, and tubing. As the pressure increases, it deforms and reshapes the seal so that sealing pressure increases to withstand the larger containment requirements.



An oil seal consists of three simple components which are the sealing element, the metal case, and spring. As the function of an oil seal is to preclude leakage along the shaft, this challenge is mainly achieved by the sealing element. The metal case flexes and grips the seal when it is held at the low-level channel. The spring ensures that the sealing element operates smoothly.


This proves that custom seals are a boon to the automotive industry. They have not only benefited the automotive industrialists but have also been a great help to the consumers.

Valve World Expo: The Biggest Valve Industry Affair Under One Roof!

The Valve World Expo is the biggest ground to showcase and encounter the experts from the valve industries around the world. It is a one-stop shop that will assemble many great minds and act as a platform to meet proficient valve industrialists who will display their products at a large scale. It is a substantial interactive platform that focuses on individual communication. Valve World Expo brings together valve expertise from the:


● Oil, Gas, Petrochemical, and Chemical Industry

● Food Processing Industry

● Marine and Offshore Industry

● Water and Waste Water Management Industry

● Automotive and Machine Construction Industry

● Pharmaceutical Industry

● Power Generation Industry


The Valve World Expo is undoubtedly the most prestigious event for anyone who uses valve technology in their business.


Harkesh Rubber has been serving the valve needs for all kinds of engineering industries for the past 35 years. Our services employ a combination of well-established product mastery and ingenious engineering. What makes us idiosyncratic are the custom-made solutions we provide with optimum quality service.


We, at Harkesh Rubber, are experienced at fulfilling the technical merchandise requirements for multiple industries within strict timelines. With a reputation for excellence around the world, we have served clients in Asia, Europe, the Middle East, the USA and many other countries.


We provide expert solutions for:


Rubber Diaphragms


The Rubber Diaphragm is a multifaceted tool that is used as a sealing agent between two elements. It has a huge demand in industries like power generation, aerospace, chemical and process, and more.




O-Rings have a variety of purposes in different application areas. They are used to stop the air from passing between the two ends. They are available in various metric and inch standard sizes. O-Rings are commonly used for plumbing purposes, automobile requirements, air-conditioning technology, and more.




The seal is used in rotary shaft equipment to keep dust, dirt, oil or any other contaminants out while keeping it lubricated. The sealing element, the metal case, and the spring are what form the oil seal.




We are well-renowned for the production of custom-made rubber gaskets. They are used to prevent leakage between two articles under compression. These gaskets are made to withstand and handle extreme pressure and wear.


Harkesh Rubber is proud to exhibit at Valve World Expo 2018. The event will be held from the 27th-29th November 2018 in Düsseldorf, Germany. Make sure to visit our booth, located at Hall 4 / F22 at the venue!


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