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Latest update: 10/01/2020 14:25:10

Maruho Sangyou Co., Ltd.

We are contributing to the electric power industry with plastic insulation covers.

We are a plastics manufacturer established in 1949. Our main products are insulation covers and other plastic products for the electric power industry. These products can be made of various materials, such as PE, acryl, PP, and PVC. We provide integrated in-house management of all processes from manufacturing to quality control, and sales to the power industry (Chubu Electric Power) account for 90% of our total sales volume. We have engaged in joint R&D projects with Chubu Electric Power on the themes of insulation covers and underground conduits. Our insulation cover received the Good Design Award.

Main image

Sales Pitch

Quick response to requests for high-mix low-volume production
We have manufactured and delivered more than 10 million insulating covers for over 60 years.       
We excel at high-mix low-volume production with our reliable production line with operators.
We perform in-house quality tests with various calibrated testing machines every year.

Other presentation

[Company strength]
Our company has specialized in plastics since our establishment, and most of our production equipment consists of injection molding machines. Our main customer is Chubu Electric Power, and they employ our insulation-related products, which are mainly used in connecting sections. Quality control for products of this kind is based on long-term use. This is why we possess our own test equipment for managing calibration in-house to ensure that all our products meet the test requirements. We have confidence in insulation tests with a withstand voltage tester that boosts the voltage up to 100,000 volts. We have been conducting these tests for over 50 years. 

[Business description]
Our company mainly manufactures plastic products (insulation covers) for power companies, and we conduct the entire manufacturing process as well as quality control in-house. A power company (Chubu Electric Power) accounts for 90% of our total sales volume. Our extensive lineup of injection molding machines includes 50- to 350-ton capacity units. 

Plastics manufacturing and sales

[Strength of products/technologies]
We manufacture plastic products that have an insulating capability against 100,000 volts. They can be made of various materials such as PE, acryl, PP, and PVC. 

[Representative's message]
Our company has been dedicated to plastics from our establishment to the present day. We make use of 50- to 350-ton injection molding machines and various materials to deliver satisfying products to our users. This is done as we improve our own technologies and techniques until the customer is satisfied. We provide support while stressing the importance of speed in these operations. 

[Company structure for market development/overseas expansion]
Please contact Managing Director Hoga ( for inquiries.

[Awards and media coverage]
Good Design Award, for our CP visor (1988) and insulation cover (1994).


[Main Clients / Business History (domestic)]
Chubu Electric Power has been our customer for more than half a century. 

[Main Clients / Business History (overseas)]
Chubu Electric Power; Toenec; Furukawa Electric Works; C-TECH; Chuo Denki Koji; Kawakita Electrical Construction Engineering; Himeno; The Pack.

This company is recommended by the following support organizations.

Chubu Head Office, SMRJ

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