About Us

1.Our History

DOIT is a specialized rubber products manufacturer that based on Japanese and Taiwanese quality control and production technology. We have 8 years experiences of mold design and material formula application, production and quality control, as well as customer relationship management. With our production facilities, highly skilled teams, and the cooperation experiences with the world´s top 500 enterprise OEM and ODM, you can be sure that your requirements will be fulfilled in the most professional manner.  

       We are constantly researching on precision sealing and precision rubber product. At the same time, we react to customers´ demands fast and provide the customers technical services. We aim at developing a long-term win-win cooperation relationship with our customers.

       Today, we have a long list of satisfied buyers throughout Japan, United States, and Europe. Based on customer referral, we have also developed products which apply to camera, optical component, precision instrument, solar energy, blood pressure monitor, solenoid pump, connector, water heater, gas safety valve, medical equipment, etc.

       High quality, punctual delivery, competitive price, attentive services are our goals for customers. We are a company never satisfied with what we had achieved, but always looking for ways of doing better. DOIT will always invest in developing the newest technologies and share the breakthroughs with our clients.

2. Our Factory

DOIT is located in the China city-Dongguan. As a global supplier in the rubber & silicone precision part, like grommets, gaskets, washer, o-ring, impeller, one way valves two-way valves, diaphragm and so on. Doit rubber products Co., Ltd is to create added value for customers around the world.

Doit Rubber Products Co. LTD

3.Our Product

Our products includes the following: 

Custom grommets

Custom gaskets and washer

Custom o-ring

Custom impeller

Custom one way valves and two-way valves

Custom diaphragm


We supply above products with many materials:




Fluorosilicone (FVMQ)




Our customers are globe to a wide range of companies worldwide, ranging from large multinational organizations to small individual companies. 

4.Product Application

Rubber & silicone precision part, like grommets, gaskets, washer, o-ring, impeller, one way valves two-way valves, diaphragm and others used in the following industry, such as Connecter, Optics, Electronics, Electrics, Micro electromechanical, Solenoid valve, Solenoid pump Automobile, food industry and medical industry.

5.Our Certificate

We always feel that all success of our company is directly related to the quality of the products we offer. They meet the highest quality requirements as stipulated in ISO9001, ISO TS16949 SGS guidelines and our stringent quality control system. 

6.Production Equipment

Mold-making facility: Taiwan CN/Taiwan EDM/Mirror surface EDM/Taiwan precision grinder/Japan KURODA tool chuck …

Inspection Equipment: Rheometer/ Molding machine for test button & slab/ Tensile strength & elongation tester/ Cold shortness tester/ IRHD Hardness Tester/ Nikon Microscope…

Manufacturing Equipment: Open roller for silicone/ Open roller for rubber/ Silicone material cutter/ Rubber material cutter/ Compression molding machine

/ Liquid injection machine/ Vertical rubber injection molding machine…

CNC process CNC加工 (001).jpg

Taiwan miller(001).jpg

Taiwan precision grinder(001).jpg


100% inspection room(001).jpg

Compression molding 1 一次硫化(001).jpg

compression molding 成型(001).jpg

Open roller (001).jpg

Tensile strength & elongation tester(002).jpg

7.Production Market

We have customers from both domestic market and oversea market.  Doit rubber products Co., Ltd Sales can speak fluent English for good communication. Our market around the world.

8.Our service

Besides our existing molded products, Doit rubber products Co., Ltd also can produce liquid silicone products according to the drawings or samples from our customers. We control the product quality critically for every step during the manufacturing from custom precision rubber or silicone parts to difference industry. 

1. O-ring Design

2. Material Selection

3. Component Structure

4. Tolerance suggestion

5. Color requirement

6. Surface Quality Acceptance Criteria

7. Assembly Part Structure suggestion

8. Seal Life