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Message from the President

“High-value added manual dip forming which cannot be formed by automatic machines”

President & CEO Takatoshi Endo
“Specialty handmade dip molding expertise enables Seiwa to produce products which cannot be formed by automated systems.”

We have specialized in dip molding for more than a quarter of a century since our company’s foundation. Dip molding is a simple process, however, specific knowledge is required to produce high quality products.

Our former president conducted research and development on new products at a research institute before establishing our company which he continued to emphasize. These advances established Seiwa as a center of excellence for dip molding. We have developed unique process and patents working with both commercial and academic institutions.

Seiwa focuses on small lot production and offers unique products of various shapes and dimensions impossible for other companies to produce. This experience enables us to provide unique and specialized dip molding procedures to our clients.

Our new president Takatoshi Endo is continuing our research programs and is dedicated to continuing the development of our company’s methods and technologies.

To respond to the needs of our customers, our mission is to develop products that other companies find difficult to manufacture. Seiwa will continue to employ its unique processes and methods to provide solutions to our clients' dip molding requirements.

Please contact us with your most challenging dip molding specifications.

Company Profile

Company name SEIWA KASEI , INC
Representative Founder : Masakazu Endo / CEO : Takatoshi Endo
Established year In 1983
Address 524-1 Dome, Kazo, Saitama 349-1157 Japan
Telephone number +81-480-72-8101
Fax +81-480-72-6855
URL http://www.seiwa-kasei.co.jp
E-mail Contact us by E-mail
Capital stock 10,000,000yen
Business description Mainly dip forming by vinyl chloride and latex

Company History

1982 Started as a personal business in Kuribashi-cho (Kuki city at present)
Main business content is dip forming (dipping) made from PVC and latex.
1986 Advanced into a medical field from a start of manufacturing balloons for ultrasonic endoscope from latex. In addition, to enter a nuclear field, acquired a patent of manufacturing method of tong boots to achieve domestic production of tong boots.
Manufactured high-value-added products according to our first president’s management philosophy.
1988 On November 1, 1988, established “Seiwa Chemical Industry Co., Ltd.”
1989 Trough establishment of a method for manufacturing, manufacturing products such as balloons for ultrasonic endoscope, bag for anesthesia apparatus, guide tube for relief of esophageal blockage etc.
of medical field entered the peak production.
1996 With the business expansion, the head office and factory relocated to the current Otone-cho (present Kazo City).
1998 Also with the business expansion, the number of employees was largely increased.
2001 By the increased attention of solar panels and photovoltaic generation in the construction field, support cradles coated long durable PVC to cradles and solar panel support cradles were started experimental productions on request.
2006 We began to accept a lot of orders for products other companies could not manufacture because of our dip forming (dipping) know-how over a long period.
2009 Acquired the second administrative innovation acknowledgment.
2012 The products we only can manufacture products extended to various kinds, because of this we established the project “Project D” to improve the manufacturing technology for employees.
2012 Because of the Great East Japan Earthquake, we succeeded in research and development of variable color PVC sheets which an operator can safely handle solvents and chemicals such as radioactive materials, deleterious substances and poisonous materials and we acquired the patent with it.
2013 With the business expansion, we secured a planned relocation site of a big scale of a main office and factory in Kuki City (former Kuribashi-cho).
The Kan-juku (training seminar for young middle management personnel) started.
2014 Because of movement away from atomic energy and energy shortage, a mega solar system started construction in a relocation planned site in Kuki City (former Kuribashi-cho).
2015 Representative Director Masakazu Endo resigned as president, and became the senior advisor. Takatoshi Endo assumed a post of president and CEO.
The mega solar heating system under construction in a planned construction site was completed in Kuki city.

Our mouldable resins and moulding

These are moulding methods by different materials that Seiwa Kasei Co., Ltd. carries out.

PVC(Poly Vinyl Chloride)

PVC sol coating (Dip coating)
Up to 1000mm in height, 1300mm in width and 600mm in depth are possible for coating. Depending on the coating, it is widely used for various purposes such as protection, anti-rust and insulation. Also, it can be utilized for measures without vinyl chloride, phthalic acid or hormone-disrupting chemicals.
PVC sol moulding (Dip moulding)
We chiefly deal in dip moulding using flexible PVC sol. Also, we supply products with unique characteristics such as cold dip (thickness: 0.1mm to 0.5mm),a thin film forming with bellow-like moulded products rotational dipping (patent). The thin film moulding is used for medical balloons, and the rotational dip moulding is used for bellows for free movement of nuclear power. It can also be done without hormone-disrupting chemicals.
International Business Support Services, Inc.


NR latex moulding
Using latex enables us to make dip moulding for medical balloons and other various things such as gloves. This is a good rubber which has tensile strength. elongation and tearing strength. However, it may cause protein allergy to some people. In addition, it has its weakness in ultraviolet light.
CR latex moulding
CR latex has good weather and ultraviolet radiation resistance which is used for automobile parts and outdoor products. However, as it includes chlorine, it is difficult to dispose after use.
IR latex moulding
As IR latex has almost the same structural formula with NR latex, the properties are very similar. However, because it is formed by synthesis, protein is not included and it affect one's allergies. It is used for medical balloons, anaesthetic masks, bags and other products. Compared to NR, it may be inferior in regards to tearing strength, but is adequate for general use.
NBR latex moulding
NBR latex has good oil and weather rsistance and is therefore widely used in industrial parts, oil-resistant gloves and other products. Compared to NR, it may be inferior in regards to tensile and tearing strength as with IR. However many have no problems depending on its use.


Silicone moulding
There are two component types, which can be moulded like PVC sol. Due to good temperature-resistance, they are being used for the parts with need heat-resistance and anaesthetic bags, so autoclave treatments can be made. However, it still has some problems because of its high price.
Acrylic sol moulding
It was developed as de-PVC sol, and can be processed with the same conditions. Howeever, as the price is three times of PVC sol, it has not been sufficiently circulated. Despite this, we consider that as our company's image of the future. Measures without -PVC and -hormone-disrupting chemicals are needed and friendly to humans and the environment.



Caps (medical)
Classification PVC sol moulding
Use Caps for blood circuit of dialysis
Caps (medical)
Classification PVC sol moulding
Use Caps for blood circuit of dialysis
Acrylic caps(medical)
アクリルキャップ (医療)アクリルキャップ (医療)
Classification Acrylic sol moulding
Use Caps for blood circuit of dialysis
※Chlorine-free resin for environment-friendliness
Rubber tube(medical)
ゴム製チューブ (医療)ゴム製チューブ (医療)
Classification specially-treated
Use Specially treated tube that can be used for medical purpose
Guide tube(medical)
ガイドチューブ (医療)ガイドチューブ (医療)
Classification Special medical compounded PVC sol moulding
Use Guide tube for relief of esophageal blockage
Classification Latex moulding
Use Bag for anesthesia apparatus
Classification Latex moulding
Use mask for anesthesia apparatus
Balloons for ultrasonic endoscope(medical)
Classification IR Latex moulding, natural latex moulding
Use Balloons for ultrasonic endoscope
Balloons for endoscope(medical)
内視鏡バルーン (医療)内視鏡バルーン (医療)
Classification IR Latex moulding, natural latex moulding
Use Balloons for endoscope
Uneven balloons(medical)
偏肉バルーン (医療)偏肉バルーン (医療)
Classification IR Latex moulding, natural latex moulding
Use Medical balloons

Construction related

Caps (construction related)
キャップ (建設関係)キャップ (建設関係)
Classification PVC sol moulding
Use Waterproof caps for roof bolts
Bellows-like covers(nuclear related)
蛇腹カバー (原子力関係)蛇腹カバー (原子力関係)
Classification Special PVC sol moulding
Use Bellows-like covers


Small caps (others)
小口キャップ (その他)小口キャップ (その他)
Classification PVC sol moulding
Use Protective caps
Classification PVC sol moulding
Use Covers for windshield wiper
Ultrathin capsule caps(others)
Classification PVC sol moulding
Use light electric appliances
Explanation 0.1mm capsule caps by hot dip


Location Map article

◎Car to Arriving
About 7 minutes from “Kazo Interchange” “Hanyu Interchange” of Tohoku Expressway

◎Train to Arriving
JR Utsunomiya Tobu Nikko Line " Kurihashi Station " about 15 minutes by car from the station .
524-1 Dome, Kazo, Saitama 349-1157 Japan
Business hours
Hours 8:00〜17:00
TEL +81-480-72-8101
FAX +81-480-72-6855
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