Siwin is a technology oriented high-tech company in silicone material industry.
We have been engaged in this field more than 15 yeas, witnessing a prosperous development of Chinese silicone materials and as one of the players, we have contributed our work and innovation to our customers and the whole industry.

Hot Product

Siwin now is the largest supplier of construction raw materials in north America,

over 1500MT materials exported monthly.

OH polymer, silicone oils are Reach registered, also able to provide low D3-D10 version.

New Promotion

SIWIN-AM121 is a UPDATED water scavenger designed for the production of moisture-curing construction adhesives and sealants, greatly improves the storage stability.

WR50

Silane waterproof emulsion.

Widely used in anti-corrosion, extend shelf life, for example concrete fence, concretefloor,building mortar exterior, etc.

SILANE TERMINATED POLYMER

Dimethoxy(methyl)silylmethylcarbamate-

terminated polyether

FOR MS SEALANT

O6224

It is a reactive chemical containing styryl and amine organic groups and a trimethoxysilyl group.

Vinyltriisopropenoxysilane can be used as cross linking agent with excellent performance, offers superior quality to the production of silicone rubber,

FOR SILICONE RUBBER

Industry Application

Siwin product portfolio are widely used in sealant, coating, plastic composite, cable, filler treatment, electronic industries.

Fiber Glass & Composite

Coating & Ink

Cable & Tube

Rubber & Plastic

Waterproof & Protection

Pigment & Filler

Textile & Dye

Sealant & Adhesive

We are a high-tech company focusing on the development, production and sales of silicone materials,

located in the beautiful historical city of Nanjing. Our strong R&D capabilities and rich application

experience enable us to provide customers with a full range of customized solutions.

Customization Will Better Meet Your Needs

1. Provide different sealant&adhesive customers the services of special organosilicone additives and their development and formulation design. For example, we have developed some special organosilicone additives for HB.FULLER, helping them improve their products’ performance while reducing costs .
2. In the coating industry, providing customers with a full range of organic silicon product designs, and continuously improve customer’s products’ performance.

Meet Nanjing Howell at FEICON 2026 | Booth L025

Nanjing Howell New Material Technology Co., Ltd. is excited to exhibit at FEICON 2026, one of Latin America’s most influential construction events. We warmly welcome contractors, distributors, and industry partners to visit us in São Paulo, Brazil.Discover Our Advanced Building MaterialsVisit Booth

Siwin To Exhibit at Korea Coatings Show 2026 – Booth C11

Siwin is pleased to announce that we will once again be exhibiting at the Korea Coatings Show in Incheon from March 25–27, 2026. You can find us at Booth C11. This year marks our fourth consecutive participation in this important industry event, and we are excited to return to Incheon to reconnect w

Join Nanjing Howell at MosBuild 2026

About MosBuildMosBuild stands as the largest and most impactful building and construction exhibition in Russia and Eastern Europe. Hosted annually in Moscow, the event brings together top manufacturers, suppliers, and industry experts from around the world, creating an essential venue for discoverin

Nanjing Howell & SIWIN Shine at Adhesives & Bonding EURASIA 2025

Nanjing Howell and SIWIN took part in Adhesives & Bonding EURASIA 2025, a key international event for the adhesive and bonding sector, held from November 26–28, 2025, at Istanbul Expo Center (İstanbul Fuar Merkezi), Booth A432. As a worldwide supplier of high-quality silicone raw materials and silan

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Hot Product

New Promotion

SILANE TERMINATED POLYMER

Industry Application

Customization Will Better Meet Your Needs

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