六菱ゴム List of Products and Services

Rokubun Rubber's rotary seals have been developed and sold based on our customers' usage conditions. These seals have been designed and developed by identifying issues through discussions with customers to meet their needs. Over the years since the initial development began, we have expanded our product lineup to accommodate a wide variety of usage conditions across different fields. This catalog summarizes the rotary seals that have been developed through such a history. These seals are designed to flexibly address areas that cannot be handled or improved by conventional general oil seals, prioritizing the satisfaction of our customers' usage conditions. Rokubun Rubber aims to be a manufacturer that can propose further improvements and wishes to develop new products together with our customers.

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In recent years, due to the impact of climate change, weather disasters have become more severe and frequent, and there are concerns about the potential occurrence of large-scale earthquakes in the future, such as the Nankai Trough earthquake and the Tokyo metropolitan area earthquake. At the same time, the aging of infrastructure is expected to accelerate, necessitating various countermeasures. Rokubishi Rubber is making daily efforts to develop and provide products that can be of help to society. This time, we would like to introduce the developed countermeasure products against natural disasters, along with examples of their installation and product performance. [Contents of the published article] - Water-tightening openings installed above ground that can be easily opened and closed - A quick reference chart explaining the properties of rubber [Supplementary data] This document can be accessed via "PDF Download." ◇ Sewerage Exhibition 2025 Osaka - Exhibition ◇ Date: July 29 (Tuesday) - August 1 (Friday), 2025 Location: Intex Osaka, Hall 5A (Piping Materials Zone), Booth No. 5-207 Additionally, we will also exhibit at the following exhibitions this year: Mini Waterworks Exhibition (July 18 in Toyama, July 24 in Fukushima, July 29 in Kochi, August 5 in Saitama) We invite you to take this opportunity to view our products.

• Disaster prevention supplies

The "Slide-type Shell Cover" is a safety cover that ensures stable and high water-stopping performance by using a self-sealing lip seal mechanism. By equipping a heavy-duty lid, which is designed to withstand various disasters, with casters, it can be easily opened and closed by a small number of people. Installed at the openings of underground structures, it protects these structures from risks such as flooding due to storms and tsunamis, as well as fire spread from nearby fires. 【Features】 ■ Caster mechanism: Easy to open and close ■ Self-seal: Exhibits high water-stopping capability ■ After installation: Water-stopping performance can be confirmed *For more details, please refer to the PDF materials or feel free to contact us.

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The "Hexa Seal Cover" prevents flooding into facilities that house important equipment from tsunamis and heavy rainfall. It can accommodate displacements from various directions. Seal covers of 100A or larger are equipped with reinforcing fabric for excellent pressure resistance. Additionally, it is a one-cut product, allowing for post-installation. 【Features】 ■ Absorbs displacement with rubber to prevent wall cracks ■ Can be adapted for internal pressure (indoors) and external pressure (outdoors) according to the installation location ■ Capable of accommodating displacements from various directions ■ Seal covers of 100A or larger have reinforcing fabric for excellent pressure resistance ■ One-cut product allows for post-installation *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce our "Hexagate Plug." It allows for water stop confirmation after installation. It features an easy-to-open and close manhole structure with a pin insertion mechanism operated by a handle. It can be used for temporary storage of rainwater main lines in shield tunnels, as well as for safety measures during branch connection work and countermeasures against backflow during heavy rainfall. 【Features】 ■ High water-stopping seal mechanism ■ Water stop confirmation possible after installation ■ Easy-to-open and close manhole structure ■ Manhole water stop mechanism *For more details, please refer to the PDF document or feel free to contact us.

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Rokubun Rubber's industrial rubber products are active in various fields such as iron and steel, shipbuilding, gas, energy, civil engineering, railways, and pharmaceuticals. Rubber products, being elastic materials, hold infinite possibilities that cannot be matched by other materials. We will continue to strive to provide our customers with even safer and more reliable products, challenge new initiatives as a manufacturer of industrial rubber, and focus on the development of new products. We kindly ask for your continued support and encouragement. 【Business Description】 ■ Manufacturing and sales of industrial rubber products, other rubber products, industrial resin products, and other resin products. * For more details, please refer to the PDF document or feel free to contact us.

• Anti-vibration rubber

The "Hexaprop Seal" utilizes the advantages of U-shaped packing and is a sealing material designed to have the required tension against the groove. As a sealing material with a flange structure, it eliminates the hassle of attachment and detachment, while providing sufficient sealing performance against vibration and expansion. The inherent tension of the product adheres to the packing groove, making it unlikely to come loose, allowing for quick attachment and detachment of joints, which greatly simplifies the work. 【Features】 ■ Utilizes the advantages of U-shaped packing and has the required tension against the groove ■ Eliminates the hassle of attachment and detachment, providing sufficient sealing performance against vibration and expansion ■ The inherent tension of the product adheres to the packing groove, making it unlikely to come loose ■ Allows for quick attachment and detachment of joints, greatly simplifying the work *For more details, please refer to the PDF document or feel free to contact us.

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The "ISOLATION BALLOON Type-II" is a device that temporarily blocks the piping during the replacement and maintenance of safety valves to prevent the leakage of vapor gas from the tank. The pressure resistance performance has been significantly improved compared to Type-I. It features a unique three-layer structure made from a special silicone material designed for extreme low temperatures. Additionally, it allows for work from the side, enabling operations in a compact space. 【Features】 ■ Significantly improved pressure resistance performance compared to Type-I ■ Unique three-layer structure using special silicone material for extreme low temperatures ■ Compact design (significantly reduced branch pipe diameter) from 150A to 80A ■ Allows for side work (enabling operations in a compact space) *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce our product, "HEXA RTP." This product allows for easy operation, enabling opening and closing while holding the handle. It features a simple design with minimal protrusions. Additionally, the positive pressure is 4.94×10^-4 Pa·m³/s, and the negative pressure is 9.25×10^-4 Pa·m³/s. Please feel free to contact us if you have any inquiries. 【Features】 ■ Simple design with minimal protrusions ■ Easy operation that allows opening and closing while holding the handle ■ Airtight performance ・ Positive pressure: 4.94×10^-4 Pa·m³/s ・ Negative pressure: 9.25×10^-4 Pa·m³/s *For more details, please refer to the PDF document or feel free to contact us.

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"RIPP" is an entrance seal device with two types of portal ring shapes: "end flat shape" and "end special shape." It features a self-sealing type starting with "Type-A (Automatic)," as well as "Type-B (Breakthrough)" for reaching and pulling out, and "Type-C (Compression)" for starting and reaching. Please feel free to contact us when you need assistance. 【Features】 ＜Type-A (Automatic)＞ ■ Self-sealing type for starting ■ Additional tubes can be added to enhance water-stopping capability ■ Examples: - Simultaneous backfill injection pipe section, straight section of rectangular shield, reverse R section of DOT and MF, lower part of large-diameter shield, and full circumference * For more details, please refer to the PDF materials or feel free to contact us.

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The "Ship Bottom Plug" is an inspection tool that allows for safe, easy, and low-cost inspections of the ship's bottom while at sea. It can be installed by hand tightening, so no tools are required. For diameters of 300A and above, a tank type is used, which improves workability by reducing weight through buoyancy underwater. It can be operated by one person, enabling overall cost reduction. 【Features】 ■ No tools required (can be installed by hand tightening) ■ High sealing performance ■ Applicable to various piping ■ Tank type used for diameters of 300A and above ■ Improved workability through weight reduction by buoyancy underwater ■ Can be operated by one person *For more details, please refer to the PDF document or feel free to contact us.

• Environmental Survey

The "Hexafilter Unit" is a portable filtration device that purifies the contamination of pit water within nuclear facilities, allowing for a reduction in process time. Early purification (clarification) after cavity water filling is possible. It can shorten the start time for fuel retrieval operations. 【Features】 ■ Portable ■ Uniform filtration system with a diffusion nozzle ■ Easy filter replacement ■ Early purification (clarification) after cavity water filling is possible ■ Shortens the start time for fuel retrieval operations *For more details, please refer to the PDF document or feel free to contact us.

• Septic tank equipment

The "Hexa Balloon Series" is used as a sealing material to temporarily block pipelines during valve replacement and maintenance work in various types of pipelines. We offer a range of products including the LNG ship balloon "Isolation Balloon Type-II," large diameter balloons (spherical) called "Mega Balloons," and specially shaped balloons for "Dust Prevention Balloons." Additionally, we have a variety of lineups available according to different applications. 【Features】 ■ Temporarily blocks pipelines during valve replacement and maintenance work ■ A wide range of lineups available ■ Designed and manufactured to meet customer specifications such as size and material *For more details, please refer to the PDF document or feel free to contact us.

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The "Flex Rubber Seal: Ω Type" is installed between segment tunnels constructed using the shield method, absorbing complex stresses and displacements caused by earthquakes or improper subsidence, ensuring the safety of the tunnel. It can absorb various stresses and displacements. It has excellent pressure resistance due to the fabric-reinforced rubber. 【Features】 ■ Installed between segment tunnels constructed using the shield method ■ Absorbs complex stresses and displacements caused by earthquakes or improper subsidence ■ Ensures the safety of the tunnel ■ Capable of absorbing various stresses and displacements ■ Excellent pressure resistance due to fabric-reinforced rubber *For more details, please refer to the PDF document or feel free to contact us.

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The "EMG Seal Cover" is designed to be installed retroactively around the outer circumference of existing rubber expansion joints without modifying the existing joints. The seal case, divided into sections around the circumference, is fixed to the existing flange using mounting brackets. By using and installing it in conjunction with rubber expansion joints used in large plants such as nuclear power plants and thermal power plants, it is possible to temporarily prevent water leakage caused by the rupture of rubber expansion joints during an earthquake. 【Features】 ■ Ensures the safety of pipelines ■ Capable of absorbing displacement during earthquakes (130mm) ■ Can be retrofitted (without modifying existing joints) *For more details, please refer to the PDF materials or feel free to contact us.

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The "Hexa Expansion Dome Seal Type Σ" is a membrane structure made of rubber that holds gas pressure and accommodates vibrations and expansions. Additionally, by using a resin retainer, it provides rust prevention, reduces maintenance, and allows for long-term use. It is installed in the absorption areas between the tank and the hull of LNG and LPG vessels, where vibrations and expansions occur during navigation, and is used for gas holding and water tightness. 【Features】 ■ High elasticity achieved through a rubber-only structure ■ Prevents retainer biting by using protective rubber ■ High durability by using a resin retainer ■ Diaphragm type also available in the lineup *For more details, please refer to the PDF document or feel free to contact us.

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As a countermeasure for the frequent natural disasters occurring in recent years, Rokubiryu Rubber is proposing various "flood prevention products." Starting with the "Shell Cover II," which prevents flooding from ground openings, we also offer the "Seal Cover," a water stop device for wall penetration piping, and the "Shield Door," a watertight door. The flood prevention products developed by our seal manufacturer protect essential equipment from tsunamis and heavy rainfall. 【Product Lineup】 ■ Hatch Water Stop Device: Shell Cover II ■ Penetration Hole Water Stop Device: Seal Cover ■ Watertight Door: Shield Door ■ Water Stop Temporary Wall: Hexagate Plug *For more details, please refer to the related link page or feel free to contact us.

• Disaster prevention supplies

The "Hexa Shield A" is a watertight door from a seal manufacturer that protects important equipment from flooding. Unlike gasket types, it uses a self-sealing lip seal, which allows for stable water-stopping performance without the need for torque management. 【Features】 ■ Protects important equipment from flooding ■ Can be installed after construction ■ Compatible with internal and external pressure ■ Stable water-stopping performance (water stop secured with latch fixation) *For more details, please refer to the PDF materials or feel free to contact us.

• Stainless steel copper door

"RIP-TUBE" is a special rubber tube with pressure resistance, constructed using a laminated structure with reinforcing fabric. By applying pressure (air, water, etc.) to the tube, it expands and can be used for various applications such as space blocking materials and sealing materials. Our company can manufacture it in ring-shaped or linear forms to meet your needs. 【Features】 ■ Laminated structure using reinforcing fabric ■ Usable for various applications such as space blocking materials and sealing materials ■ Can be manufactured in ring-shaped or linear forms to meet your needs *For more details, please refer to the PDF document or feel free to contact us.

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The "TUBE SEAL" expands (inflatable) by being pressurized with a fluid (air, water, oil, etc.), sealing gaps and demonstrating its sealing function. It can seal large gaps and can adapt to unevenness, distortion, misalignment, and vibrations on the sealing surface. Additionally, it allows for pressure management and on/off adjustments via remote control, and the sealing surface pressure can be adjusted through pressure management. 【Features】 ■ Capable of sealing large gaps ■ Can adapt to unevenness, distortion, misalignment, and vibrations on the sealing surface ■ Allows for pressure management and on/off adjustments via remote control ■ Sealing surface pressure can be adjusted through pressure management ■ Specifications can be designed separately according to application *For more details, please refer to the PDF document or feel free to contact us.

• Tunnel Materials

The "VD Seal" is a self-seal with a unique single lip structure based on a U-shaped packing design. It is designed to be used across a wide range of low to high pressures by setting the angle of the lip tip, thickness, and housing structure, allowing for sealing without the lip tip being lifted or inverted. Additionally, the sealing lip has very low surface pressure against the shaft surface due to face contact, resulting in minimal wear on both the shaft and the lip. 【Features】 ■ Prevents the intrusion of external dirt, mud, and water into the sealing area of the rotating shaft ■ Used to protect bearings and retain lubricants ■ Has a unique single lip structure based on a U-shaped packing design ■ Allows for sealing without the lip tip being lifted or inverted ■ The sealing lip has very low surface pressure against the shaft surface due to face contact *For more details, please refer to the PDF document or feel free to contact us.

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This product is a closure plug used for blocking the openings of various pipelines. It is utilized in various fields to prevent the intrusion of foreign objects during plumbing work and to stop the outflow of liquids and gases from the pipelines. Due to its simple and lightweight design, it excels in workability and can be quickly attached and detached as needed, greatly contributing to the reduction of labor hours. This product effectively expands the opening by sandwiching a rubber ring with a C-shaped cross-section between two inclined iron plates. 【Features】 ■ No tools required for easy operation ■ Cost-effective with rubber ring replacement *For more details, please refer to the catalog or feel free to contact us.

• Water and sewerage pipe fittings