六菱ゴム List of Products and Services

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 secure 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 Activities】 ■ 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.

• Sealing

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 managed 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.

• others

The "Hexaprop Seal" utilizes the advantages of U-shaped packing and is a sealing material that has 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 product itself adheres to the packing groove with its own tension, making it unlikely to come off easily, allowing for quick attachment and detachment of joints, which makes the work significantly easier. 【Features】 ■ Utilizes the advantages of U-shaped packing and has the required tension against the groove ■ Eliminates the hassle of attachment and detachment while providing sufficient sealing performance against vibration and expansion ■ Adheres to the packing groove with its own tension, making it unlikely to come off easily ■ Allows for quick attachment and detachment of joints, making the work significantly easier *For more details, please refer to the PDF document or feel free to contact us.

• Sealing

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 over 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.

• Sealing

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 follow the irregularities, distortions, misalignments, and vibrations of 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 follow the irregularities, distortions, misalignments, and vibrations of 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.

• others

This product is a closing 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 prevent the leakage of liquids and gases from the pipelines. Due to its simple and lightweight design, it offers excellent 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】 ■ Easy operation without tools ■ Cost-effective with rubber ring replacement *For more details, please refer to the catalog or feel free to contact us.

• Piping Materials
• Other electronic parts
• Pipe Fittings

The "Hexa Expansion Dome Seal Type Σ" is a membrane structure made of rubber that holds gas pressure and accommodates shaking and expansion. 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 ships, where shaking and expansion occur during navigation, and is used for gas holding and water tightness. 【Features】 ■ High elasticity is achieved due to the rubber-only structure ■ The use of protective rubber prevents the retainer from biting in ■ High durability is achieved by using a resin retainer ■ Diaphragm type is also available in the lineup *For more details, please refer to the PDF document or feel free to contact us.

• Sealing

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, 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 allows for single-person operation, enabling overall cost reduction. 【Features】 ■ No tools required (can be installed by hand) ■ High sealing performance ■ Applicable to various piping ■ Tank type used for diameters of 300A and above ■ Improved workability through weight reduction by buoyancy underwater ■ Single-person operation possible *For more details, please refer to the PDF document or feel free to contact us.

• Inspection fixture

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. It has significantly improved pressure resistance 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 compared to Type-I ■ Unique three-layer structure made from a 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.

• Sealing

"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, full circumference * For more details, please refer to the PDF document or feel free to contact us.

• Sealing

"RIP-TUBE" is a special rubber tube with pressure resistance, constructed using a laminated structure reinforced with 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 straight forms to meet your needs. 【Features】 ■ Laminated structure using reinforced fabric ■ Usable for various applications such as space blocking materials and sealing materials ■ Can be manufactured in ring-shaped or straight forms to meet your needs *For more details, please refer to the PDF document or feel free to contact us.

• tube

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 materials or feel free to contact us.

• Sealing

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 backflow prevention during heavy rainfall. 【Features】 ■ High water stop sealing 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.

• Sealing

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 them from risks such as flooding due to storms and tsunamis, and 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 document or feel free to contact us.

• Sealing

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

• Sealing

The "Hexa Shield A" is a watertight door from a seal manufacturer that protects critical 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 critical 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 document or feel free to contact us.

• Sealing
• Safety Door Switch
• Other safety and hygiene products

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 (no modification of existing joints) *For more details, please refer to the PDF document or feel free to contact us.

• Sealing

The "Hexa Filter 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.

• Filter Unit

"BLAT (Band Less Air Tight)" is a bandless airtight container system that enables the automation of sealing and opening operations for containers. Instead of a steel clamp band, we use our proprietary "HEXA Tube." The "HEXA Tube" is a hollow rubber tube seal with a bending section, designed to contract and expand in diameter through fluid manipulation (vacuum or atmospheric pressure) within the tube. [Features] - Automation of processes is possible when combined with an air suction system - Disassembly and cleaning are possible (using silicone and SUS304) - Maintains airtightness even with temperature changes - Automation of processes - Enables the automation of sealing and opening operations for containers *For more details, please refer to the PDF document or feel free to contact us.

• Stainless steel container

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 for 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.

• Sealing

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 balloons 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.

• Sealing

As a measure to strengthen national resilience against the frequent natural disasters in recent years, Rokubishi 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 critical equipment from tsunamis and heavy rainfall. 【Product Lineup】 ■ Hatch Water Stop Device: Shell Cover II ■ Penetration Water Stop Device: Seal Cover ■ Watertight Door: Shield Door ■ Water Stop Temporary Wall: Hexa Gate Plug *For more details, please refer to the related link page or feel free to contact us.

• Other safety equipment

In recent years, due to the impacts of climate change, weather disasters have become more severe and frequent, and there are concerns about future large-scale disasters such as the Nankai Trough earthquake and the Tokyo metropolitan area earthquake. At the same time, the aging of infrastructure is expected to accelerate in the future, necessitating various countermeasures. Rokubishi Rubber is making daily efforts to develop and provide products that can be of some help to society. This time, we would like to introduce the developed products for disaster countermeasures against natural disasters, along with examples of their installation and product performance. [Contents of the published article] ◆ Waterproofing openings installed above ground for easy opening and closing ◆ Quick reference chart explaining the properties of rubber [Supplementary data] ◇ Exhibiting at the Sewerage Expo 2025 Osaka ◇ Date: July 29 (Tuesday) - August 1 (Friday), 2025 Location: Intex Osaka, Hall 5A (Piping Materials Zone), Booth No. 5-207 ◇ Exhibiting at the Mini Waterworks Expo ◇ July 18 (Friday) - Toyama July 24 (Thursday) - Fukushima July 29 (Tuesday) - Kochi August 5 (Tuesday) - Saitama *We are currently offering a free quick reference chart on rubber properties! This material can be checked via "Catalog Download." Please take this opportunity to view our products.

• Other safety equipment