Recent News

Resin Column/What is Flame-Retardant?

Resin Column/What is Flame-Retardant? ________________________________________ The terms incombustible, flame-retardant, flame-proof, and fire-resistant are similar but have slightly different roles. • Incombustible: A material that does not burn when lit. Typical examples include glass and metal. • Flame-retardant: A material that can catch fire but does not spread easily. • Flame-proof: A material that can catch fire but extinguishes itself when the fire source is removed and does not spread easily. • Fire-resistant: A term used for "buildings and structures." It is a performance designed to not break down in the event of a fire, or to maintain its function for a certain period of time. At first glance, the terms are very similar, but there are strict differences. ________________________________________ < About UL94, the flame retardant standard for resins > UL94 of the United States is widely used as a representative standard for evaluating the flame retardancy of resins. In this standard, fire is applied to a resin plate, and the flame retardancy is evaluated in 6 stages (HB to 5VA) based on the state of combustion. [Premise] Fire is applied to a resin plate, and the grade is judged based on the burning time, the falling of the spark, and the presence of holes. < Main criteria (image) > • HB: Fire is applied, and the grade is judged based on the burning time and burning speed. • V-2: Fire burns when lit, and the burned spark drops. • V-1: Fire burns when lit, but the spark does not fall. • V-0: Burns but does not remove tinder, shorter burning time than V-1 • 5VB: Burns but does not remove tinder. However, if directly seared with strong flame, holes will appear • 5VA: Burns but does not remove tinder, highest grade without holes even if seared with strong flame *In actual tests, detailed conditions such as burning time and number of times are specified, but here is only an overview. As for the level of flame retardancy, HB < V-2 < V-1 < V-0 < 5VB < 5VA It is easy to understand if you imagine that the flame retardancy is higher as you move to the right. ________________________________________ < Specific Applications by UL94 Grade > • HB: Applications with low flame retardancy requirements 　　Packaging materials, home appliance exteriors, building panels, general plastic parts, etc. • V-2: Applications requiring light electrical safety 　　Small home appliance parts, switch covers, parts inside home appliances, etc. • V-1: General level for electronic equipment 　　Electrical component cases, power unit parts, motor covers, etc. • V-0: Standard level required for electronic equipment 　　This level is required as a standard for many electrical and electronic equipment. 　　PC and TV housings, connectors, battery holders, etc. • 5VB: For high-energy electrical equipment 　　Applied to parts used under stricter conditions. 　  Electric control panels, power supply cases, electrical components of industrial equipment, etc. • 5VA: Applications requiring particularly high reliability for fire safety 　　Used for critical parts used in high-energy environments close to fire sources. 　　High-voltage equipment, EV battery cases, aircraft parts, etc. ________________________________________ < Introduction to SEKISUI SEIKEI Co., Ltd.'s Flame-Retardant PP Sheet > Finally, we will briefly introduce SEKISUI SEIKEI Co., Ltd.'s flame-retardant resin products. SEKISUI SEIKEI Co., Ltd., has a line of flame-retardant PP sheets. The flame-retardant grades correspond to "UL 94" HB to V-0 and can be selected according to the application. • They have excellent electrical insulation and do not cause hydrolysis. • This material complies with stricter environmental regulations and does not contain the six substances regulated by the RoHS Directive. • It can be proposed as an alternative material for various flame retardant specifications. • We can provide individual responses including design aspects such as color toning and embossed patterns. We are already used by many customers in a wide range of fields such as electrical and electronic equipment, automobiles, and building materials, as introduced in this article. Products made from Polyvinyl Chloride(PVC) are also flame retardant, but we do not conduct UL testing for all our company products. Please contact us for details. ________________________________________

Notice of Consecutive Holidays

We would like to inform our valued customers and partners that our offices will be closed for the summer holiday during the following period: Wednesday, April 29, 2026 – Wednesday, May 6, 2026 Regarding Product Orders and Shipping Please note that all business operations, including order processing, production, and shipping, will be suspended during the above period. Orders placed before or during the closure may experience delays in delivery. We sincerely appreciate your understanding and patience. Regarding Email and Inquiry Response Inquiries and orders received during the closure period will be reviewed and addressed in the order received, starting from Thursday, May 7, 2026. While our website's contact form will remain available, please be advised that responses will be provided after business resumes. We apologize for any inconvenience this may cause and thank you for your continued support and understanding.

Exhibiting at SEMICON JAPAN 2025

We will exhibit at SEMICON JAPAN 2025, which will be held at Tokyo Big Sight from Wednesday, December 17 to Friday, December 19, 2025.At this exhibition, we will showcase our clean containers for semiconductor and electronic material applications as part of the SEKISUI CHEMICAL Group’s exhibition.SEMICON JAPAN is an international exhibition that brings together the latest technologies related to semiconductors and electronic devices, attracting a wide range of companies and engineers involved in materials, components, and manufacturing processes. Through this exhibition, we will introduce the design concept and potential applications of our clean containers, developed with a focus on high-purity material handling.Please note that our exhibit is presented as part of SEKISUI CHEMICAL Co., Ltd.’s exhibition at SEMICON JAPAN 2025.For details of the SEKISUI CHEMICAL Group’s overall exhibition, please also refer to the following announcement on the parent company’s website:https://www.sekisuichemical-hppc.com/en/news/detail/21/Basic features and typical applications of our clean containers are introduced on the following product page:https://www.sekisuiseikei.co.jp/en/clean/During the exhibition period, we will be available to discuss potential applications and evaluation considerations for clean containers.We look forward to welcoming you at the booth.Exhibition InformationExhibition: SEMICON JAPAN 2025Official Website: https://www.semiconjapan.org/enDates: December 17 (Wed) – December 19 (Fri), 2025Venue: Tokyo Big SightBooth: SEKISUI CHEMICAL Group BoothEast Hall 6, Booth No. E-6241

Notice of Winter Holiday Closure

We would like to inform our valued customers and partners that our offices will be closed for the summer holiday during the following period: Saturday, December 27, 2025 – Sunday, January 4, 2026 Regarding Product Orders and Shipping Please note that all business operations, including order processing, production, and shipping, will be suspended during the above period. Orders placed before or during the closure may experience delays in delivery. We sincerely appreciate your understanding and patience. Regarding Email and Inquiry Response Inquiries and orders received during the closure period will be reviewed and addressed in the order received, starting from Monday, January 5, 2026. While our website's contact form will remain available, please be advised that responses will be provided after business resumes. We apologize for any inconvenience this may cause and thank you for your continued support and understanding.

Article/Bag-in-Box Containers: A Sustainable Solution for Efficient Liquid Packaging

Bag-in-Box (BIB) is an innovative packaging solution designed for storing and transporting liquids safely and efficiently.Known for its convenience and eco-friendliness, Bag-in-Box systems are increasingly adopted across diverse industries — from food and beverages to industrial chemicals. In this article, we explain the structure, advantages, environmental impact, and applications of Bag-in-Box containers, as well as introduce SEKISUI SEIKEI’s “Rontainer”, our proprietary BIB solution trusted by global manufacturers. What Is a Bag-in-Box (BIB)? A Bag-in-Box consists of two main components: Inner bag (Bag) – A flexible liner made from polyethylene (PE) or multi-layer film that securely holds the liquid. Outer box (Box) – A rigid outer shell made from cardboard or plastic that protects the bag during transport and handling. This dual-layer structure combines high liquid retention and excellent transport durability, making Bag-in-Box an ideal choice for liquids that require clean, leak-free packaging. Advantages of Bag-in-Box Packaging One of the biggest advantages of Bag-in-Box containers is their ease of handling and storage efficiency.Unlike rigid containers, BIBs can be folded flat before filling and after use, which significantly reduces storage space requirements and waste volume. The sturdy outer box allows safe transport without spillage, while the lightweight structure minimizes transportation costs and improves operational efficiency from filling to disposal. Environmental Benefits Bag-in-Box packaging contributes to sustainability in multiple ways: Lightweight and compact design reduces fuel consumption during transportation. Lower CO₂ emissions compared with traditional rigid containers. Reduced waste volume after disposal thanks to its collapsible structure. As a result, BIBs are recognized as a highly eco-friendly packaging solution that aligns with global efforts toward carbon neutrality and resource efficiency. Applications of Bag-in-Box Containers Bag-in-Box systems are used in a wide range of industries, including: Food and beverage: Seasonings, syrups, oils, and dairy products. Industrial and chemical: High-purity chemicals, industrial reagents, and corrosive or viscous liquids. Emergency and outdoor use: Water storage for camping or disaster relief. Their versatility and cleanliness make them suitable for both consumer and industrial liquid logistics. SEKISUI SEIKEI’s “Rontainer” – Reliable Bag-in-Box Solution At SEKISUI SEIKEI CO., LTD., we manufacture and sell Bag-in-Box containers under the brand name “Rontainer.”Since its launch, Rontainer has been used across diverse industries including industrial chemicals, food, purified water, dairy, and pharmaceuticals. Each Rontainer is produced using blow molding technology, which provides a strong, self-standing structure.Additionally, every unit undergoes a 100% automatic leak inspection to ensure the highest quality and reliability for our customers. Learn more about Rontainer (Bag-in-Box, BIB) Discover the Future of Sustainable Packaging Bag-in-Box systems represent the future of sustainable liquid packaging — balancing functionality, safety, and environmental performance.At SEKISUI SEIKEI, we continue to develop high-quality BIB solutions to meet the growing global demand for efficient, eco-friendly containers.

Notice of Summer Holiday Closure

We would like to inform our valued customers and partners that our offices will be closed for the summer holiday during the following period: Wednesday, August 13, 2025 – Sunday, August 17, 2025 Regarding Product Orders and Shipping Please note that all business operations, including order processing, production, and shipping, will be suspended during the above period. Orders placed before or during the closure may experience delays in delivery. We sincerely appreciate your understanding and patience. Regarding Email and Inquiry Response Inquiries and orders received during the closure period will be reviewed and addressed in the order received, starting from Monday, August 18, 2025. While our website's contact form will remain available, please be advised that responses will be provided after business resumes. We apologize for any inconvenience this may cause and thank you for your continued support and understanding.

Article/Clean Containers for High‑Purity Chemicals: Ideal for Storage and Transport

High‑purity chemicals are essential in semiconductor manufacturing and electronic materials. To maintain quality throughout storage and transportation, selecting the right clean containers is crucial. “Clean containers” are produced in controlled environments with low particulate levels and use materials that minimize leaching of metallic or other contaminants. Below, we explain why clean containers are key to preserving purity in chemicals and how to choose them. Characteristics & Challenges of High‑Purity Chemicals High-purity chemicals must maintain extremely high levels of purity, as even minute impurities can significantly affect product quality. Consistent quality control throughout the entire process—from production to final use—is essential. ・Contamination control Even trace impurities can compromise product quality. Choose containers with excellent sealing and minimize exposure by handling them in clean environments. ・Environmental sensitivity High‑purity chemicals often react to changes in temperature, humidity, or light. Proper environmental controls are necessary during storage and transport. ・Vibration and impact resistance Movement during transport can jeopardize chemical integrity. Containers made from shock-resistant materials and compliant with UN regulations help safeguard contents. How to Choose Clean Containers １．Material compatibilitySelect container materials that are chemically inert with the stored chemical, and that do not leach into the contents. ２．Particulate controlContainers should be manufactured in low‑particulate environments. Depending on the chemical, containers may also be pre-washed before use. ３．Design & structureLook for features like airtight lids, structural strength, ergonomic handling, and designs that minimize residuals. For hazardous chemicals, ensure the container meets UN transport standards. ４．Size and capacity matchingMatch container size to your needs—whether lab-scale or production-scale. Using the same material for R&D and scale-up can streamline container validation and reduce lead time. Sekisui’s Clean Container Solutions １．High-grade polyethylene materialsSekisui’s inner linings use polyethylene with minimal metal leaching, offering strong resistance to various chemicals. ２．Strict particulate controlIn Sekisui’s clean manufacturing facilities, cleanliness is tightly monitored. For example, 200 L clean drums are produced in environments where ≤ 10 particles ≥ 0.5 µm per mL are present ３．UN‑rated designs & low leftover volumesSekisui offers a complete lineup—from sub‑1 L clean bottles to 200 L drums—all compliant with UN hazardous‑goods shipping standards. Expert design helps reduce residual liquid and improves user efficiency . ４．100% renewable energy productionSekisui’s facilities are transitioning toward renewable energy to reduce greenhouse gas emissions. Full production using 100% renewable electricity is planned starting April 2025 . Clean Container Special Feature Page For more detailed information tailored to your application—whether you're working in labs or large-scale manufacturing—feel free to get in touch for inquiries

Announcement of Website Renewal

Thank you for visiting the website of SEKISUI SEIKEI CO., LTD. We are pleased to announce that our corporate website was renewed on July 14, 2025.To enhance user experience, we have refreshed the design and introduced new features. < Additional Features >・Support for smartphone browsing・Expanded News & Updates section (featuring information from exhibitions, columns, and more) We remain committed to providing our customers with even better service.Thank you for your continued support.

The English translation page of Stellitainer Plus is now available.

Thank you for visiting the website of SEKISUI SEIKEI CO., LTD. To participate in the exhibition in the United States,we have published an English page of our company product Steritainer Plus. Steritainer Plus Special Page https://www.sekisuiseikei.co.jp/en/cp/ Exhibitions we attend ・American Association for Cancer Research (AACR)　※April 25～30：Chicago ・American Society of Gene & Cell Therapy　※May 13~17：New Orleans ・BIO International Convention　※June 16~19：Boston Contact us https://www.sekisuiseikei.co.jp/en/contact/ Thank you for your continued support.