#Japan #Tokyo #Sunstar #PrimerWC-1 #Water-Based

Introduction

Sunstar Engineering Co., Ltd. is proud to announce the launch of the 'Primer WC-1', Japan's first water-based primer designed specifically for construction sealing materials. Slated for release on August 19, 2026, this innovative product aims to enhance safety, workability, and address the stringent regulations surrounding chemical substances in construction.

Background on Safety Concerns

In recent days, the construction industry has faced increased scrutiny regarding the effects of odors from sealant applications on living environments during renovation projects, particularly in high-density residential areas. Additionally, amendments to occupational safety and health laws have led to tighter regulation on chemical substances, increasing the requirement for personal protective equipment (PPE) for workers. Traditional solvent-based primers often contain regulated components like ethyl acetate, necessitating protective masks during application, which raises concerns regarding safety and comfort for construction workers.

Development of Primer WC-1

In response to these issues, Sunstar has developed 'Primer WC-1', replacing the primary solvents with water to tackle multiple challenges simultaneously. One of the key features of this product is its significantly reduced odor intensity, enhancing the living conditions during renovation work. Moreover, it minimizes the need for respiratory protective equipment during indoor application, thereby improving both safety and workability for施工者.

Environmental Considerations

As 'Primer WC-1' is classified as a non-hazardous material according to fire safety laws, it alleviates restrictions in storage and transportation, thus improving logistics efficiency. The product is also designed with a focus on sustainability, contributing to a decrease in volatile organic compound (VOC) and CO₂ emissions compared to traditional organic solvent-based alternatives. Through innovative compound design, Sunstar has also addressed the common concern regarding drying times associated with water-based products. With the adoption of drying acceleration technology, the open time has been reduced to approximately 60 minutes, ensuring practicality in施工現場.

Key Features of Primer WC-1

1. Significant Odor Reduction: Compared to traditional products, Primer WC-1 drastically reduces odors, providing a better living environment during renovation work.
2. Improved Safety for施工者: The need for respiratory protective gear in indoor applications is eliminated, contributing to enhanced safety and workability for construction workers.
3. Logistics Efficiency: Being classified as a non-hazardous product enhances storage and transportation efficiencies, benefiting retailers and logistics operations.
4. Japan's First Water-Based Primer: This innovative product is the first single-component water-based primer for sealing materials in Japan, with the primary solvent being water.
5. Reduced VOC and CO₂ Emissions: Compared to traditional solvent-based products, Primer WC-1 significantly cuts down VOC and CO₂ emissions.
6. Reduced Open Time: The product incorporates advanced design and drying technologies, achieving an open time of just about 60 minutes.

Specifications

• - Components: Acrylic resin
• - Volume: 500ml square bottle
• - Shelf life: 4 months after manufacture (unopened, below 25°C)
• - Usage: Suitable for sealing work on concrete and sash joints in RC structures
• - Drying Time: 60 minutes (open time at 20°C)
• - Effective Time After Application: 1 to 8 hours

Release Date

The Primer WC-1 will officially launch on August 19, 2026.

About Sunstar Group

The Sunstar Group, based in Switzerland and with companies distributed globally, encompasses various sectors from oral care to industrial adhesives and sealing materials. Sunstar aims to create products that balance safety, workability, and environmental sustainability across its extensive offerings.

For product inquiries, please contact Sunstar Engineering Co., Ltd. at Sunstar Engineering or through their Tokyo, Nagoya, and Osaka offices.