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  6. Case Studies of Hot Melt Molding for Waterproof Sealing of Circuit Boards and Electrical Components

Case Studies of Hot Melt Molding for Waterproof Sealing of Circuit Boards and Electrical Components

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Low Pressure Molding, Hot Melt Molding, Waterproof and Dustproof, Encapsulation Molding

last updated:Dec 12, 2025

Matsumoto kakou Co.,Ltd.
Matsumoto kakou Co.,Ltd.
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"Complete sealing of electronic components in just a few dozen seconds. Ideal for waterproofing, dustproofing, and insulation!" Hot melt molding is gaining attention for the waterproof sealing of electronic components.

We introduce the adoption of hot melt molding technology that demonstrates excellent sealing performance by directly injecting sustainable hot melt adhesives made from natural fatty acids into electronic components. □ Adoption Examples Waterproofing and dustproofing of circuit boards, waterproof connectors, sensor harnesses, harnesses, switches, etc. □ Benefits of Adoption 1. Reduction in the number of components 2. Reduction in the amount of resin used 3. Shortening of processing time ◆ If you would like a collection of case studies, please download the catalog. ◆ If you would like a sample of the actual product, please contact us.

    Other electronic partsOther polymer materialsCoating Agent
PCB-2.JPG

Case Studies of Hot Melt Molding for Waterproof Sealing of Circuit Boards and Electrical Components

PCB-2.JPG
PCB-2.JPG LED.JPG PCB.JPG 少数生産品.JPG 水周り.JPG
  • Matsumoto Processing Official Website
  • Special site - Product/service details - https://pr.mono.ipros.com/matsutame/product/

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basic information

●What is Hot Melt Molding? It is a technology that demonstrates excellent sealing performance by directly injecting hot melt adhesive into electronic components. □Advantages of Adoption 1. Reduction in Processing Time Hot melt molding completes one molding cycle in about 10 seconds to several tens of seconds. Unlike potting, there is no need for curing time. 2. Reduction in the Number of Parts Unlike potting, hot melt molding does not require a case. This allows for a reduction in the number of parts and production processes. 3. Reduction in the Amount of Resin Used Hot melt molding can be shaped with minimal thickness that conforms to the inserted components. At Matsumoto Processing, we respond quickly to the reliability requirements of our customers' products by proposing optimal hot melts, modeling sealing shapes, designing and manufacturing molds, and prototyping. For customers wishing to introduce hot melt molding processes in-house, we provide comprehensive support including the manufacturing and sale of molding machines and molds, development of molding parameters, process startup assistance, and supply of hot melt adhesives. Additionally, for customers who wish to outsource hot melt sealing, we offer contract molding services.

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Applications/Examples of results

- Waterproofing of printed circuit boards for automotive/consumer use - Waterproofing of sensors for automotive/consumer use - Waterproofing of harnesses for automotive/consumer use

Detailed information

  • LED.JPG

    LED module For waterproof protection of LED fixtures. Achieve cost reduction by switching from silicone potting!

  • PCB.JPG

    Waterproof protection for printed circuit boards. Achieve significant cost reduction by switching from epoxy potting. Additionally, it is a one-step process that takes only a few seconds, so no work-in-progress is needed!

  • 少数生産品.JPG

    For small quantities, hot melt molding is low pressure, which means that the equipment and molds are also small and inexpensive (molds cost around 300,000 to 500,000 yen). If the production cost of resin cases is high for small-scale production, please consider hot melt molding.

  • 水周り.JPG

    Intermediate harnesses for water-related equipment, etc. Achieve cost reduction through hot melt molding with case-less design, reduced resin usage, and shortened production time!

catalog(11)

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"Complete sealing of electronic components in just a few dozen seconds. Waterproof, dustproof, and insulated." Case studies on hot melt molding. ■Matsumoto Processing■

"Complete sealing of electronic components in just a few dozen seconds. Waterproof, dustproof, and insulated." Case studies on hot melt molding. ■Matsumoto Processing■

TECHNICAL
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"Complete sealing of electrical components in just a few dozen seconds. Waterproof, dustproof, and insulated." Case studies on hot melt molding (automotive parts) ■Matsumoto Processing■

"Complete sealing of electrical components in just a few dozen seconds. Waterproof, dustproof, and insulated." Case studies on hot melt molding (automotive parts) ■Matsumoto Processing■

TECHNICAL
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"Complete sealing of electrical components in just a few dozen seconds. Waterproof, dustproof, and insulated." Technical document: Introduction to hot melt molding. ■Matsumoto Processing■

"Complete sealing of electrical components in just a few dozen seconds. Waterproof, dustproof, and insulated." Technical document: Introduction to hot melt molding. ■Matsumoto Processing■

TECHNICAL
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Hot Melt Molding Product Case Studies (Photos Before*After)

Hot Melt Molding Product Case Studies (Photos Before*After)

TECHNICAL
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"Complete sealing of electronic components in just a few dozen seconds. Waterproof, dustproof, and insulating" - Polyamide-based hot melt for molding.

"Complete sealing of electronic components in just a few dozen seconds. Waterproof, dustproof, and insulating" - Polyamide-based hot melt for molding.

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"Complete sealing of electrical components in just a few dozen seconds. Waterproof, dustproof, and insulated." Hot melt molding machine MK500 by Matsumoto Processing.

"Complete sealing of electrical components in just a few dozen seconds. Waterproof, dustproof, and insulated." Hot melt molding machine MK500 by Matsumoto Processing.

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"Complete sealing of electronic components in just a few dozen seconds. Waterproof, dustproof, and insulated." Hot melt molding machine MK520 ■ Matsumoto Processing ■

"Complete sealing of electronic components in just a few dozen seconds. Waterproof, dustproof, and insulated." Hot melt molding machine MK520 ■ Matsumoto Processing ■

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"Complete sealing of electrical components in just a few dozen seconds. Waterproof, dustproof, and insulated." Hot melt molding machine MK600 ■ Matsumoto Processing ■

"Complete sealing of electrical components in just a few dozen seconds. Waterproof, dustproof, and insulated." Hot melt molding machine MK600 ■ Matsumoto Processing ■

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"Complete sealing of electrical components in just a few dozen seconds. Waterproof, dustproof, and insulated." Hot melt molding machine MK700H by Matsumoto Processing.

"Complete sealing of electrical components in just a few dozen seconds. Waterproof, dustproof, and insulated." Hot melt molding machine MK700H by Matsumoto Processing.

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Low-cost & High-tactile molding machine MK10 ■Matsumoto Processing■

Low-cost & High-tactile molding machine MK10 ■Matsumoto Processing■

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Hot Melt Applicator MK-MELTER ■Matsumoto Processing■

Hot Melt Applicator MK-MELTER ■Matsumoto Processing■

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News about this product(47)

Waterproof sealing of LED substrates

For waterproofing, dustproofing, and insulation of electrical components. The spotlight is on the sealing technology "Hot Melt Molding." Complete sealing of electrical components is achieved in just a few seconds.

  • Product news

"Complete sealing of electrical components in just a few dozen seconds. Ideal for waterproofing, dustproofing, and insulation!" Hot melt molding, which is gaining attention for waterproof sealing of electrical components, uses thermoplastic adhesives in low-pressure insert molding to achieve environmental protection such as waterproofing and dustproofing for electrical components like mounted circuit boards. Compared to traditional two-component potting and conformal coating, sealing is completed in an extremely short time, leading to an expansion in its adoption as a sealing technology. Now, at Matsumoto Processing Lab, nine hot melt molding machines are installed, and you can observe the process of hot melt sealing electrical components. Customers wishing to visit are encouraged to inquire.

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Motor Sealing Case 1

Waterproof and insulation protection for small motors in a short time. The spotlighted sealing technology "Hot Melt Molding."

  • Product news

"Complete sealing of small motors in just a few dozen seconds. Ideal for waterproofing, dustproofing, and insulation!" Hot melt molding, which is gaining attention for waterproof sealing of small motors, is a technology that achieves environmental protection such as waterproofing and dustproofing by low-pressure insert molding of thermoplastic adhesives. Compared to traditional thermosetting resin sealing, two-component potting, and conformal coating, sealing is completed in an extremely short time, leading to its expanded adoption as a sealing technology. If you are considering waterproof sealing and protection for small motors, please feel free to contact us.

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Waterproof sealing of LED substrates

For waterproofing, dustproofing, and insulation of electrical components. We present a small desktop molding device for the spotlighted sealing technology "hot melt molding" in a video. Complete sealing of electrical components is achieved in just a few seconds.

  • Product news

"Complete sealing of electronic components in just a few dozen seconds. Ideal for waterproofing, dustproofing, and insulation!" Hot melt molding, which is gaining attention for waterproof sealing of electronic components, is a technology that achieves environmental protection such as waterproofing and dustproofing by low-pressure insert molding of thermoplastic adhesives onto electronic components like mounted circuit boards. Compared to traditional two-component potting and conformal coating, sealing is completed in an extremely short time, leading to an expansion in the adoption of this sealing technology. Now, our company, Matsumoto Processing, is selling a compact tabletop molding device for hot melt molding called the "MK500." We have introduced this machine in a video on YouTube. Please take a look. (You can watch the video via the link below.) Thank you very much for your attention.

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Waterproof sealing of LED substrates

Sustainable electrical component sealing technology "Hot Melt Molding." Suitable for waterproofing and insulation of electrical components. Achieves complete sealing in a short time.

  • Product news

"Complete sealing of electrical components in just a few dozen seconds. Ideal for waterproofing, dustproofing, and insulation!" Hot melt molding, which is gaining attention for waterproof sealing of electrical components, uses thermoplastic adhesives in low-pressure insert molding to achieve environmental protection such as waterproofing and dustproofing for electrical components like mounted circuit boards. Compared to traditional two-component potting and conformal coating, sealing is completed in an extremely short time, leading to its expanded adoption as a sealing technology. Additionally, due to the following features, it is also gaining attention as a sustainable sealing method: - The hot melt we handle is a solvent-free, one-component hot melt made primarily from plant-derived natural fatty acids. - The process does not require heating during the curing process, making it an energy-efficient operation. Now, at the Matsumoto Processing Lab, nine hot melt molding machines are installed, and it is possible to observe the actual process of hot melt sealing of electrical components. Customers interested in observing are encouraged to inquire.

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Companynews list (80)

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Matsumoto

Matsumoto kakou Co.,Ltd.

Manufacturing and processing contract

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Our company provides comprehensive support for the introduction of hot melt molding methods, from initial technical discussions and appropriate hot melt selection to prototype production and evaluation, optimal process considerations for mass production, proposals for optimal equipment or the design and manufacturing of dedicated machines (automated systems), hot melt supply and line support. For customers for whom equipment installation poses a barrier to adopting this method, we even offer production contracting at our facility, ensuring support from "start to finish." **Benefits of Hot Melt Molding** - Improved production efficiency and cost reduction through alternative methods to potting - Greater design flexibility due to mold forming, enabling miniaturization and lightweighting of components - Use of sustainable raw materials derived from natural fatty acids We have various molding machines and displays of adopted products available at our prototype lab in Fuji City, Shizuoka Prefecture. Please feel free to visit, even just for a tour.

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