Blogs Archives - Hi-Tech Seals

Hydraulic Seals and Pneumatic Seals

Client Web3 — Wed, 04 Feb 2026 15:25:27 +0000

Hydraulic seals and pneumatic seals are precision-engineered components used in cylinder systems in static and dynamic applications. They are designed to prevent leakage, protect internal components, and maintain system pressure. Their role is crucial to maintain the efficiency and performance of the system, while extending the cylinder’s life cycle. Hi-Tech Seals provides an extensive selection of rod seals and piston seals for single-acting and double-acting systems. They are available in numerous materials and lip configurations to suit different pressures, temperatures, media, and application requirements.

Main Functions

1.) Prevent Leakage – These sealing components maintain internal pressure and prevent media leakage by creating pressure barriers between moving parts. Piston seals prevent pressurized media from bypassing to the opposite side of the chamber, while rod seals stop internal media from escaping the cylinder as the rod extends and retracts. They can adapt to withstand different pressures demanded in the application. When system pressure presses onto the elastomer, it causes the elastomer to expand, conforming to the surfaces being sealed, providing a tighter seal. Back-up rings can help support the elastomer to withstand high pressures by keeping the elastomer in place and preventing it from entering the clearance gap. 2.) Prevent Contamination – Wipers, in particular, act as a barrier to keep dirt and debris out of the cylinder, preventing external contaminants from entering the system and protecting internal components.

Common Seals for Hydraulic and Pneumatic Cylinders

O-Rings O-Rings grooves allow the O-Ring to be squeezed diametrically out-of-round even before the pressure is applied. The distortion of the O-Rings is a resilient elastic compound that fills the leakage path, thus creating a seal.

Wipers Wipers prohibit contaminants from entering the cylinder and damaging the internal seals and components. They scrape the system’s surface when it moves, eliminating any debris or elements that may have gathered. They can also act as a secondary rod seal.

Loaded U-Cups Loaded U-Cups are primarily used for dynamic reciprocating applications. They are an excellent seal in low pressure piston or rod applications. The loading lip forces increases as the system pressure increases, automatically compensating for the higher pressure while maintaining a positive seal. Unloaded U-Cups and Homogenous U-Cups are available as style options.

Wear Rings Wear rings help keep the piston and rod centered and prevent metal-to-metal contact between components. This allows for even distribution of pressures to limit the chances of damaging the components and seals.

Piston Rings Piston rings’ main function is to form a seal between the cylinder rod and piston, preventing lubricants and gases from leaking. They also support the movement of the piston by maintaining the pressure within the cylinder.

Buffer Seals Buffer Seals are commonly used in combination with another rod or piston seal, typically a U-cup style seal. Buffer seals in rod applications are designed to absorb pressure fluctuations when working under high-load conditions, which increases the lifespan of a rod seal.

Machined Seals Machined seals provide users with custom sealing solutions to precisely fit their specific requirements. Rapid Seal is Hi-Tech Seals’ in-house elastomer and plastic machining service. Our sealing specialists are able to quickly design and manufacture new, replacement, and prototype components. Customers have the option to select from standard pre-programmed profiles or collaborate with our team to design a precision-machined sealing solution.

Seal Kits Seal kits provide customers with seal replacements to help them stay organized, increase installation efficiency, and simplify the ordering process for cylinder maintenance.

Conclusion

These seals play a critical role in hydraulic and pneumatic cylinder performance. Proper seal selection, considering environmental exposure and operating conditions, supports improved cylinder integrity, reliability, and long-term performance. Connect with our sealing specialists to find the right solution for a hydraulic or pneumatic cylinder application.

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Understanding O-Ring Extrusion Failure

Client Web3 — Wed, 21 Jan 2026 21:20:12 +0000

O-rings are among the most widely used sealing solutions in industrial applications due to their simplicity, cost-efficiency, and ease of installation. However, O-rings can experience failure in various ways. One of the most common O-ring failures is extrusion. What is O-Ring Extrusion Failure? Extrusion occurs when the elastomer is forced into the clearance gap between mating components under high pressure. This causes the material to become visibly nibbled, chipped, or ragged, leaving the O-ring looking tattered, while also negatively affecting the elastomer’s sealing performance. Causes of Extrusion Contributing factors to extrusion include:

Excessive pressure
Excessive clearances
Excessive gland fill
Low modulus or hardness elastomer
Irregular clearance gaps
Sharp gland edges
Improper sizing

The relationship between fluid pressure, clearance, and durometer is expressed visually in the graph below. Common Preventions There are numerous ways to prevent extrusion from occurring. One solution is reducing the clearance gap between the mating components. A reduced clearance gap gives little to no room for the elastomer to extrude. Precision machining can help achieve this tight tolerance. Proper gland dimensions and correct O-ring sizing are critical, with consideration of gland fill. Gland fill is the percentage of the gland (groove) volume occupied by the compressed O-ring. The gland fill of the installed O-ring should not exceed 85% to allow space for compression, volume swell, and thermal expansion of the O-ring. If gland fill is too high, the O-ring occupies excessive space within the groove, leading to over compression and an increased risk of extrusion. If gland fill is too low, the O-ring may not compress adequately, resulting in an ineffective seal. Using elastomer materials with a higher hardness durometer helps minimize the risk of extrusion. Harder elastomers are less malleable under high operating pressures, making them less prone to extrusion. In contrast, softer elastomers deform more easily and are more susceptible to being forced into clearance gaps. Back-Up Rings or sometimes called anti-extrusion rings are an effective way to prevent elastomers from extruding into clearance gaps. These are thin rings made of hard durometer elastomers or hard plastic materials such as KasPex™ PEEK, PTFE, and nylon. Once in place these rings will provide essentially zero clearance. They support the elastomer by increasing its ability to withstand high pressures. A single backup ring is sufficient for one-directional pressure, whereas when pressure is bi-directional, backup rings are recommended on both sides of the O-ring. Conclusion Extrusion is preventable when following the correct measures. By understanding these solutions, it will significantly reduce the probability of encountering an O-ring extrusion failure. If O-Ring extrusion failure occurs, reach out today for support in identifying and preventing this and other O-Ring failures.

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V9M2 material compound for Rapid Gas Decompression

Client Web3 — Thu, 11 Sep 2025 19:27:54 +0000

Under high pressure, gases tend to permeate the surface of an elastomer, seeping into the material’s core. This happens until the internal pressure of a material creates an equilibrium with the external pressure of the fluid media. If the external pressure experiences a sudden and significant drop, the gases that had permeated the elastomer escapes to maintain equilibrium. The gases migrate rapidly and beyond the elastomer’s capacity to handle that change. This causes fissures and ruptures, as shown in the pictures above, and is referred to rapid gas decompression (RGD) or explosive decompression (ED). It is well-known that fluorocarbon (FKM), despite being a widely used material, typically has poor low-temperature capabilities. To provide our customers with a low-temperature FKM sealing solution that resists rapid gas decompression, we have formulated the V9M2 compound using Viton™ GLT polymer. This specialty compound combines the high-temperature resilience of FKM with enhanced performance at lower temperatures, delivering a more versatile sealing solution. Its extremely low compression set is ideal for temperature and pressure cycling environments. It also has a strong resilience to a broad range of chemicals, including hot water and steam. V9M2 has undergone third-party testing for low-temperature valve sealing performance. It achieved an outstanding result at a temperature of -40°C per MESC 77/312 standards for Fugitive Emission Production Testing. V9M2 Advantages:

Enhanced low-temperature capabilities
Proven resistance to rapid gas decompression (RGD)
Low gas permeability
Outstanding mechanical properties
Exceptional resistance to petroleum, oil, and gas
Resistant to a broad range of chemicals, including hot water and steam
Good resistance in corrosive environments • Superior performance in pressure and temperature cycling applications

V9M2 also has undergone thirdparty testing set by some of the industry’s most respected regulating bodies, including:

NORSOK M-710 (Rev.2) RGD
API 6A Sour Gas Service
NACE TM0297 RGD
TOTAL GS EP PVV 142 RGD

V9M2 is used in critical applications across numerous markets, including, drilling, completions, pumps, workovers, compressors, and valves. It is is ideal for O-rings, loaded U-cups, hammer union seals, and custom moulded products. See our V9M2 flyer for more technical information or contact us to inquire about this compound.

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V9MG & V9MY: Formulated for Extreme Downhole Conditions

Client Web3 — Thu, 11 Sep 2025 18:03:00 +0000

The range of oil and gas-related applications that elastomeric products encounter is continuously growing. As demand grows, seals need to withstand extreme temperatures, abrasive media, tremendous pressures, and hostile chemical environments. Our V9MG and V9MY fluorocarbon (FKM) compounds are formulated with a Viton™ polymer. These compounds are an ideal solution for the increasing requirements of the oil and gas industry. Both compounds can handle high temperature applications and harsh downhole environments. Our V9MY compound has been tested in accordance with NACE TM0187 for sour gas. V9MG and V9MY provide similar performance when compared with hydrogenated nitrile compounds; however, they possess improved high-temperature capabilities. Compounds formula-ted with Viton™ polymers can handle harsh applications while maintaining performance capabilities. V9MG and V9MY Advantages:

Remarkable performance in high-temperature applications
Good resistance to petroleum oils and gases
Increased wear properties
Superior chemical resistance
Improved extrusion resistance
Good compression set

V9MG and V9MY are used in various oil and gas applications, including:

Drilling
Completions
Pumps
Workovers
Compressors
Valves

Our V9MG & V9MY compounds were first introduced to the industry through our loaded U-cup offering. As they gained popularity, usage of these compounds expanded into product lines such as O-rings, back-up rings, wipers, D-ring seals, T-Seals, and custom moulded products. See our V9MG & V9MY flyer for more technical information or contact us to inquire about these compounds.

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Improving Mud Motor Boots Performance with H7B1, H8B1, and H8B2

Client Web3 — Tue, 09 Sep 2025 15:29:55 +0000

Historically, mud motor boots have been a limiting factor in performance for downhole tools. The boots can encounter issues during the installation process or while in application. Tension and torque forces that are involved in the installation of standard mud motor boots require usage of equipment that can accidentally damage the product. While in an application boots undergo extreme tension and com-pression forces in addition to encountering various fluids and co-contaminants. Furthermore, thermal forces result in expansion of the grease packing and can create internal pressure within the boot. These elements can contribute to premature failure of the mud motor boot and result in costly down-time during drilling operations. Taking various parameters into account, Hi-Tech Seals developed three specialty mud motor boot compounds, H7B1, H8B1, and H8B2, that improve reliability and increase product service life. These hydrogenated nitrile (HNBR) compounds offer significantly enhanced mechanical properties and chemical resistance over standard boot materials. These compounds increase ease of installation which can reduce assembly time and improve confidence in the reliability of the product as it leaves the facility. H7B1, H8B1, and H8B2 Advantages:

Unique balance of strength and flexibility
Remarkable toughness
Excellent elongation properties
Great oil resistance
Good mechanical properties
Excellent tear strength
Great chemical resistance
Wide working temperature range

See our H7B1, H8B1, & H8B2 flyer for more technical information or contact us to inquire about these compounds.

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Rubber Blooming

Client Web3 — Mon, 08 Sep 2025 21:44:31 +0000

What is That White Dust on The Surface of my Rubber Seal?

This white, milky substance can appear on rubber components is called ‘bloom’. Rubber blooming occurs when compounding additives migrate to the material’s surface. It most commonly appears on nitrile, hydrogenated nitrile, and neoprene/chloroprene compounds. Will it affect the seal’s performance? While rubber blooming may not be aesthetically pleasing, it is normal and purely superficial. It does not affect the quality of the moulded product. If its appearance is unacceptable, it can be removed easily by washing the part in water or a light mineral oil. Since blooming is normal and doesn’t affect the function of a seal, it isn’t considered a defect or a contaminant. What causes rubber to bloom? Two common agents used in the rubber curing process are sulfur and peroxide. When these curatives aren’t fully used up, they can appear on the surface as a white or grey dry powder. Another chemical interaction that causes blooming is adding lubricants to the formulation to reduce friction. By design, the lubricant that is added is incompatible with the rubber. This conflict results in the lubricating agent migrating to the surface, causing bloom. As the agent continually blooms, the component will continue to offer reduced friction over time. The elastomer’s basic properties remain largely unchanged. It is worth noting that all lubricants must be compatible with fluid systems and adjacent surfaces to prevent complications and failures. Lubricant can be organic or inorganic:

Organic lubricants
- Amides (flake or pellet form)
- Waxes
- Esters
- Powdered PTFEs
- Mineral oils

Inorganic lubricants
- Graphite (powder or flake form)
- MoS₂ (molybdenum disulfide)

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Compounds for Low-Temp Applications

Client Web3 — Fri, 05 Sep 2025 20:50:34 +0000

V717, V9M2, & V866 Formulated for Low-Temperature Applications

Freezing conditions can be harsh on elastomeric seals. As temperatures drop below the material’s capabilities, elastomers can become more plastic-like. This change leads to reduced flexibility, increased brittleness, less rebound, and a diminished ability to maintain a proper seal. To provide our customers with low-temperature sealing solutions while maintaining high-temperature performance and other key properties, we have formulated two specialty Viton™ compounds, V717 and V9M2, and a fluorocarbon (FKM) compound, V866. Our V717 is a general-use low-temperature Viton™ compound that has undergone third-party testing for low-temperature valve sealing performance. It achieved an outstanding result at a temperature of -60°C per MESC SPE 77/312 standards for Fugitive Emission Production Testing. Similarly, our V9M2, a Viton™ compound, achieved remarkable results at -40°C when tested with the same standards. V9M2 was formulated for environments where rapid gas decompression (RGD) may be a concern. It has undergone rigorous testing to ensure it meets industry standards for RGD and sour service conditions, including:

NORSOK M-710 (Rev.2) RGD
API 6A Sour Gas Service
NACE TM0297 RGD
TOTAL GS EP PVV 142 RGD

Our V866 is our FKM compound that features an 80A durometer with excellent resistance to both diesel and methanol. It also offers exceptional performance at temperatures as low as -40°C. V717, V9M2, and V866 Advantages:

Low-temperature capability down to -60°C (V717)
Low-temperature capability down to -40°C (V9M2 & V866)
Superior performance in pressure and temperature cycling applications
Resistance to a broad range of chemicals, including hot water and steam
Excellent resistance to petroleum, oil, and gas
Remarkable resistance to diesel and methanol (V866)
Great resistance in corrosive environments
Low gas permeability
Outstanding mechanical properties
Proven resistance to rapid gas decompression (V9M2)

See our V717, V9M2, and V866 flyer for more technical information or contact us to inquire about the compounds.

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Rapid Gasket: Understanding the Process Involved

Client Web3 — Wed, 20 Aug 2025 19:46:41 +0000

Rapid Gasket is Hi-Tech Seals’ in-house gasket manufacturing service. It allows us to create standard and custom gaskets to provide quick turnaround times for our customers, minimizing downtime and reducing operating costs. Fast and Precision Measuring Customers may send gasket drawings (in .DXF format) or provide a gasket sample which we can reverse engineer using our LaserQC® machine. It scans the sample, processes the design within seconds, and outputs a production-ready file. We also provide on-site gasket measuring service for a wide range of applications such as treaters, free water knockouts, line heaters, dehydration tanks, and custom flanges. A qualified technical specialist will visit the customer’s facility to measure gasket applications using an advanced 3D scanner to ensure fast and accurate data collection. Material Selection For quick turnarounds and to meet diverse application and industry requirements, we stock a wide range of materials in various sizes and thicknesses (1/64” to ¼”). Our inventory includes high-quality rubber, plastic, and composite sheet materials. They are available in commercial, industrial, and premium grades. Select materials are FDA-compliant and certified to NSF and MIL-SPEC standards. Manufacturing Process Once materials are selected and drawings are finalized, our drafting team then exports the file directly into our knife-cutting equipment for rapid gasket production. Whether for standard profiles, complex designs, or custom-cut solutions, our knife-cutting equipment delivers clean, accurate cuts without compression marks. The cutting surface accommodates sheet materials up to 60” x 120”. For gaskets exceeding these dimensions, we apply dovetail or skiving techniques. On-Time Delivery and Streamlined Reordering Orders are typically fulfilled and delivered within approximately two days, with rush orders accommodated for urgent needs. During on-site gasket measurement, our technical specialist can also assess other consumable components, such as anodes, pigtails, isolation kits, studs, nuts, and spiral wound gaskets. Customer orders are recorded in our Lease Site Designation Management System (LSDS), which generates a unique LSDS number. This number serves as a reference for the customer’s equipment and order history, making future reordering fast and efficient. For more information about Rapid Gasket or to request a quote, email us at gaskets@hitechseals.com

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Rapid Seal Success

Client Web3 — Tue, 19 Aug 2025 19:43:34 +0000

Quick Turnaround and Precision Machined Seals Machined parts offer a practical solution, saving companies time and reducing procurement difficulties when sourcing unique and hard-to-find sealing components. This growing need has increased demand for Rapid Seal, Hi-Tech Seals’ in-house elastomer and plastic machining service. Rapid Seal is currently operating in Edmonton, Winnipeg, Calgary, and Newmarket. The expansion of our Rapid Seal operations has helped more customers reduce costly downtime by offering quick access to both standard and custom sealing components. With no expensive tooling charges, no minimum order quantities, and fast turnaround times, Rapid Seal has become a reliable source for manufacturing standard, replacement, or prototype sealing parts. Precision Seal Engineering Hi-Tech Seals works closely with customers to create machining solutions for difficult and time-sensitive sealing projects.  Our teams of sealing specialists can draft, design, and machine components to meet customers’ application requirements. Parts can be created based on product samples, customer-supplied drawings, or by using the existing metal dimensions to design a new seal. Rapid Seal provides access to over 150 seal profiles pre-programmed into our seal design software. Customers can select from a wide variety of profiles, including wipers, rod seals, piston seals, lip seals, back-up rings, gaskets, and guide rings. Advanced Machining Capabilities Equipped with several in-house CNC lathes and multiple NC machines, we use advanced machining techniques, allowing us to produce standard and custom profiles from ¼” (6 mm) ID to 29” (737 mm) OD. To optimize seal performance, we offer custom seal designs and profile modifications, including lip design, seal clearance adjustments, and alterations of dimensions tailored to specific application needs. We can also machine complex profiles with holes, grooves, cavities, chamfers, and angles. Live tooling capabilities allow us to drill, tap, and mill components radially and axially. Diverse Material Range With a broad inventory of elastomer and plastic materials in a range of tube and billet sizes, we can provide reduced lead times for various application requirements. Common materials include, nitrile, hydrogenated nitrile, Viton™, Virgin reinforced PTFE, Virgin and reinforced KasPex™ PEEK, BoKure™ Urethane, and BoKure™ GHOST. Elastomers are available in hardnesses ranging from 70 to 95 Shore A durometer. Additionally, materials with specialty compounds for low temperatures, rapid gas decompression, sour gas, and FDA-compliant applications are available. To learn more about Rapid Seal or to request a quote, contact us at info@hitechseals.com.

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