大和ケミカル List of Products and Services

Our company is engaged in the development and manufacturing of rubber products that are active in various industries such as automotive (HV/EV), energy, medical, connectors, and engines. Currently, we are distributing materials that summarize basic knowledge about rubber, methods of rubber molding, their advantages and disadvantages, and examples of common troubles that may occur when using rubber products. 【Material Overview】 ■ About natural rubber and synthetic rubber ■ Applications of rubber ■ What is synthetic rubber (composition and related topics) ■ Types of rubber compounding agents ■ Mechanism of rubber molding (cross-linking) ■ Advantages and disadvantages of rubber molding methods (Compression molding, transfer molding, injection molding) ■ Examples of troubles with rubber products (O-rings, outgassing, softening degradation, migration contamination) 【Investment in automation equipment including IoT facilities】 As a first step, we are introducing automatic assembly machines and automatic appearance inspection machines at our headquarters factory. We aim to further enhance efficiency and establish a system that can consistently supply high-quality products at low prices. *The materials can be viewed immediately from the "Download" section. If you would like an explanation about rubber or have any projects under consideration, please feel free to let us know.

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Daiwa Chemical Co., Ltd. is a company primarily engaged in the development of products using rubber and plastic. We have established a technical department within our company and are working on the development of original materials, as well as collaborating with our clients to develop highly specialized products. Additionally, leveraging our expertise in material development, we are also focusing on manufacturing and sales overseas. 【Business Activities】 ■ Manufacturing of rubber and plastic parts (Parts for automobiles, agricultural machinery, home appliances, medical devices, etc.) * We also accept online meetings. If you would like an explanation about rubber or have projects you are considering, please feel free to let us know. * For more details, please refer to our catalog or feel free to contact us.

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Our company consistently handles the design and manufacturing of parts related to automotive components, power infrastructure, medical devices, consumer electronics, and small engines. By accumulating know-how in material development, we have improved the flexibility and speed of prototype development, reducing the time it takes to develop new special formulations from one year to an average of three to six months. In the future, we will organize and consolidate recipe data to further enhance the efficiency of our development processes. 【Business Areas】 ■ Automotive-related business ■ Energy-related business ■ Medical-related business ■ Connector-related business ■ General-purpose engine-related business ■ In-house developed product: Laminated Protector *We also accept online meetings. If you would like an explanation about rubber or have any projects you are considering, please feel free to let us know. *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 quality management. Starting with a full inspection of appearance, we continue to supply good products to automotive, motorcycle, general-purpose engines, high-pressure power, medical parts, and other areas that require a high level of quality management for critical safety components. We have implemented a unique lot management system that allows for speedy tracking of the history from base compounds to final inspection and weighing. In the event of any defects, we provide prompt information and improvement measures to our valued customers. 【Product Contents】 ■ Automotive parts ■ Power and communication-related parts ■ Small general-purpose engine parts ■ Electronic device-related parts ■ Medical-related parts *We also accept online meetings. If you would like an explanation about rubber or have any projects under consideration, please feel free to let us know. *For more details, please refer to the PDF materials or feel free to contact us.

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We are engaged in the development and manufacturing of rubber products that are active in various industries such as automobiles (HV/EV), energy, medical, connectors, and engines. Currently, we are distributing materials that summarize basic knowledge about rubber, methods and advantages/disadvantages of rubber molding, and examples of common issues that may arise when using rubber products. 【Material Overview】 ■ About natural rubber and synthetic rubber ■ Applications of rubber ■ What is synthetic rubber (discussion of composition, etc.) ■ Types of rubber compounding agents ■ Mechanism of rubber molding (crosslinking) ■ Advantages and disadvantages of rubber molding methods (Compression molding, transfer molding, injection molding) ■ Examples of rubber product issues (O-rings, outgassing, softening degradation, migration contamination) * The materials can be viewed immediately from the "Download" section. * In response to the trend of sulfur-free products, our company has developed an environmentally friendly "low-sulfur grade" rubber that does not use peroxide crosslinking to eliminate the costs and time associated with secondary crosslinking. Please contact us for more details. * We also accept online meetings. If you would like an explanation about rubber or have projects you are considering, please feel free to let us know.

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We would like to introduce some representative rubber products that we handle. Starting with "Natural Rubber (NR)," which exhibits strong tensile strength and elongation even without carbon black, we also offer "Silicone Rubber (Si)," which has the ability to allow oxygen to pass through while blocking hydrogen, and "Fluoro Rubber," known for its excellent heat resistance. Please use them according to your applications. 【Lineup (Excerpt)】 ■ Natural Rubber (NR) ■ NBR ■ Butyl Rubber (IIR) ■ EPTR (EPDM)・EPR ■ CR (Chloroprene Rubber) *We also accept online meetings. If you would like an explanation about rubber or have projects you are considering, please feel free to let us know. *For more details, please refer to the PDF materials or feel free to contact us.

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Yamato Chemical completed a full renovation of the clean room on the first floor of its second factory at headquarters in March 2019, and operations began in April. The clean room specification complies with ISO Class 8 (Class 100,000). By establishing a system that allows for the completion of processes from injection molding to finishing, processing, inspection, and packaging within the clean room, we will promote more stable quality maintenance, focusing on silicone rubber products related to medical, power, and connectors. Additionally, in conjunction with this renovation, we have also expanded our silicone rubber injection molding machines, thereby increasing our production capacity compared to before. 【Features】 ■ Clean room specification: ISO Class 8 compliant (Class 100,000) ■ A system that allows for the completion of processes from injection molding to finishing, processing, inspection, and packaging within the clean room ■ Increased production capacity compared to before 【Product Examples】 ■ Sealing rubber for three-way valves ■ Gaskets for syringes ■ O-rings for medical devices ■ Neo-feed caps ■ Check valves ■ Silicone couplers for medical devices *For more details, please refer to the PDF document or feel free to contact us.

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The "Laminated Protector" is a product designed to protect the base of steel structures from corrosion caused by the macrocell phenomenon. It combines butyl rubber sheets, synthetic resin protective coatings, and self-fusing tape to safeguard the base and prevent the macrocell phenomenon. Its flexible structure allows for a wide range of applications, from poles and signs to fences, covering both public infrastructure and private drainage systems. Originally developed to meet the environmental demands and heightened safety awareness on highways, this product is now adaptable for a variety of uses. 【Features】 ■ Extends the lifespan of steel structures ■ Simple structure that does not select rust prevention targets ■ Easy to install *We also accept online meetings. If you would like an explanation about rubber or have projects under consideration, please feel free to contact us. *For more details, please refer to the PDF materials or feel free to reach out to us.

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Our company has extensive experience in "prototype and molding of rubber parts," and we can respond with ultra-fast delivery in as little as about one week from the production of prototype molds to the delivery of products. We propose cost-effective materials that meet performance requirements based on the usage environment and application. We contribute to improving the speed of rubber part prototyping and reducing costs. 【We can solve the following concerns】 - I want to choose materials that are inexpensive yet meet performance standards. - I want to quickly confirm shapes using rubber for mold production. - I want to consider special specification materials such as weather-resistant, heat-resistant, oil-resistant, and sulfur-free. - I want to know more about rubber materials. *We also accept online meetings. If you would like an explanation about rubber or have projects you are considering, please feel free to let us know. *We are currently offering a document that includes the physical properties table of the materials we handle. You can view it by selecting "PDF Download."

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The widely used "rubber" includes "natural rubber" and "synthetic rubber." The main applications of rubber include uses that take advantage of its elasticity, such as tires and balls, as well as applications that utilize its stretchability and flexibility, such as hoses and bands. Additionally, synthetic rubber comes in various types, including those resistant to oil and gasoline, those that conduct electricity, and those that do not. It is important to understand the characteristics of each type of synthetic rubber and select materials according to their intended use. 【Purpose and Types of Rubber Compounding Agents】 ■ Raw Rubber ・Purpose of Compounding: Main Material ・Types of Compounding Agents: Natural Rubber, Synthetic Rubber ・Composition Ratio: 48% *We also accept online meetings. If you would like an explanation about rubber or have projects you are considering, please feel free to let us know. *For more details, please do not hesitate to contact us.

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Each molding method has its own advantages and disadvantages, and it is necessary to select one that matches the customer's intended use and requests. In "compression molding," there are many molds that can be produced relatively cheaply, but there is a disadvantage in that it is difficult to accommodate delicate shapes such as thin pins. On the other hand, in "injection molding," materials are automatically supplied in a constant amount, making it easier to maintain consistent molding conditions, but it is not suitable for small lot production. Our company can offer various proposals utilizing our many years of know-how. If you are interested in how we select the most suitable methods and make proposals to our customers, or if you would like more detailed selection points and additional methods, please feel free to contact us. *We also accept online meetings. If you would like an explanation about rubber or have any projects you are considering, please do not hesitate to let us know. *For more details, please feel free to contact us.

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If the molding temperature and molding time of the O-ring are insufficient, the force trying to return the O-ring to its original shape is weak, causing it to remain compressed and creating gaps between the parts. As a result, the liquid that was sealed by the O-ring leaks out, leading to problems. However, the O-ring is fitted into the grooves of the assembled parts and compressed to fill the gaps with rubber. By filling the space between the parts with rubber, it seals to prevent the liquid inside from leaking, and the compressed O-ring's force to return to its original shape can close the gaps between the parts. 【Case Study】 ■ Issue - Insufficient molding temperature and molding time of the O-ring lead to gaps between parts. ■ Solution - Fill the gaps between the parts with rubber to seal and prevent the liquid inside from leaking. * We also accept online meetings. If you would like an explanation about rubber or have any projects you are considering, please feel free to let us know. * For more details, please do not hesitate to contact us.

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When using rubber products in high-temperature environments, various components such as siloxanes, oils, sulfur, and ketones can outgas. Depending on the temperature environment and application of the product, it is necessary to design formulations that suppress outgassing or formulations that minimize the adverse effects of outgassing on the counterpart products. Our company accepts consultations regarding market complaints and material troubles related to customer products, and we develop and propose new formulations as countermeasures, ensuring the supply of safe and reliable rubber parts. Please feel free to contact us when needed. 【Do you have any of the following issues?】 ■ Transparent lenses have become cloudy like frosted glass. ■ Outgassed components adhered to the counterpart product when the temperature cooled, causing contact failure. ■ Outgassing has dissolved the counterpart product. ■ Outgassing has corroded metal. *We also accept online meetings. If you would like an explanation about rubber or have projects under consideration, please feel free to let us know. *For more details, please do not hesitate to contact us.

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Migration contamination is primarily a defect that causes trouble by compromising appearance rather than performance, resulting in brown stains on design surfaces such as resin, metal, and painted surfaces, which become stains that cannot be removed. When selecting chemicals such as crosslinking agents and aging inhibitors, it is necessary to choose appropriate chemicals while considering both the product's required specifications and appearance quality requirements. Countermeasures can be implemented through formulation proposals that take functionality and application into account. Our company accepts consultations regarding market complaints and material troubles related to customer products, and by developing and proposing new formulations as countermeasures, we provide safe and secure rubber parts. 【Do you have any such issues?】 ■ After moving a rubber product that was placed on a white table, the table had turned brown with stains. ■ When storing metal and rubber together in a box, the metal became discolored. *Online meetings are also available. If you would like an explanation about rubber or have projects you are considering, please feel free to let us know. *For more details, please do not hesitate to contact us.

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The popular rubber material known for its excellent weather resistance and ozone resistance is EPDM. However, in recent years, with the development of sulfur-free options, there have been cases where peroxide-crosslinked EPDM, which is widely used, experiences a softening degradation phenomenon, melting like candy when used for extended periods in high ozone concentration environments. For peroxide-crosslinked EPDM, conducting secondary crosslinking can remove residual peroxides, significantly reducing the risk of softening degradation. Our company accepts consultations regarding market complaints and material troubles related to customer products, and we provide new formulations as countermeasures, ensuring the supply of safe and reliable rubber components. Please feel free to contact us when needed. 【Solutions】 ■ For peroxide-crosslinked EPDM, conducting secondary crosslinking can remove residual peroxides and significantly reduce the risk of softening degradation. ■ If there are concerns about softening degradation due to hydrolysis of urethane rubber, selecting ether-based urethane rubber can mitigate the risk of hydrolysis. *For more details, please feel free to contact us.

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Here are some examples of past evaluations we have received. Regarding the overly specified content in the drawings, we inquired about the intended use and proposed several alternative material grades. After conducting an evaluation and making changes to the drawings, the adoption of materials that balanced price and performance led to significant cost reductions and earned us a rationalization award. Our company is prepared to offer various proposals tailored to our customers' needs, aiming to provide suitable solutions in terms of quality, price, and lead time. Please feel free to contact us when you need assistance. [Case Study] ■ Issue: Overly specified content in the drawings ■ Solution: Proposed several alternative material grades ■ Result: Led to significant cost reductions *We also accept online meetings. If you would like an explanation about rubber or have projects under consideration, please feel free to let us know. *For more details, please do not hesitate to contact us.

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