Closed-Cell Foam Sealants
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Technical Overview
Closed-cell foam sealants are polymeric products, typically based on PE (Polyethylene), EVA (Ethylene Vinyl Acetate), NBR (Nitrile Butadiene Rubber), or IXPE (Irradiated Cross-Linked Polyethylene), characterized by a cellular structure where individual cells are sealed off from one another. This configuration prevents the passage of air, moisture, and liquid, making them effective gasketing and weatherstripping solutions. The density and firmness of the foam, combined with the characteristics of the pressure-sensitive adhesive (PSA) backing, determine the compression force required for an effective seal.
Key technical parameters include compression set (the ability to return to original thickness after compression), water absorption rate (kept very low due to the cell structure), thermal conductivity (indicating insulation efficiency), and specific gravity (density). These sealants are highly conformable while maintaining structural integrity, suitable for environments requiring consistent sealing across irregular gaps.
Why Choose Us
Differentiating Attributes
- Effective Environmental Barrier: The closed-cell structure ensures minimal water absorption and provides a reliable seal against dust and air, reducing system energy costs and maintenance.
- Consistent Compression Performance: Engineered for a low compression set, allowing the foam to recover its shape after load cycling, thereby maintaining the seal integrity over the lifespan of the assembly.
- Chemical and UV Resistance (Material Dependent): EPDM and NBR based foams offer resistance to oils, solvents, and UV exposure, extending service life in demanding environments.
- High Thermal Insulation Value: Low thermal conductivity provides an effective barrier against heat transfer, crucial for HVAC and refrigeration applications.
- Acoustic and Vibration Mitigation: Provides dual functionality by dampening mechanical vibrations and absorbing airborne noise, enhancing product quietness and reliability.
- Ease of Conversion: Uniform density and predictable compression allow for efficient die-cutting and processing into custom gaskets and shapes.
Core Features
Applications
- Gasketing in Appliances: Sealing access panels, doors, and internal compartments in refrigerators and washing machines to prevent energy loss and vibration.
- HVAC System Sealing: Creating weatherproof seals around external vents, air handlers, and duct flanges to prevent conditioned air leakage.
- Automotive Dust and Water Sealing: Used in body panels, lights, and enclosures to prevent the ingress of water and road dust.
- Vibration Damping and Cushioning: Acting as shock absorbers between metal components in electronic devices or industrial machinery.
- Window and Door Weatherstripping: Providing thermal and acoustic insulation in building envelopes.
Technical Specifications
Introduction
Closed-cell foam sealants are engineered for optimal environmental separation, providing a reliable barrier against air, dust, water, and heat transfer. Their structural integrity and adhesive strength ensure durable performance in applications ranging from automotive assemblies to HVAC systems.
Company Profile
Jiangsu Shixin Adhesive Tape Product Co., Ltd., established in 2005, focuses on specialized adhesive and foam solutions. We operate an nearly 11,000 square meter facility and adhere to international quality standards including ISO 9001, REACH, and RoHS. Our commitment is to provide technically sound, cost-effective solutions for global manufacturing partners.
We serve key industry leaders like KOREL, Skyworth, and KONKA by delivering consistent quality and reliable supply of Foam Solutions (PU/PE/NBR/IXPE) and high-performance Tapes.
Usage Guide
| Property | Test Standard | Typical Value Range |
| Foam Material | Internal Test Method | PE, EVA, NBR, EPDM, IXPE |
| Density | ASTM D3575 | 90 kg/m³ – 200 kg/m³ |
| Hardness (Shore C) | ASTM D2240 | 15 – 50 |
| Water Absorption | ASTM D1056 | < 3% by weight |
| Compression Set | ASTM D3575 | < 15% (22 hours at 23°C) |
| Thermal Conductivity (K-factor) | ASTM C518 | 0.035 W/m·K – 0.045 W/m·K |
About
Jiangsu Shixin Adhesive Tape Product Co., Ltd.
Our company was registered and established in Wuxi, Jiangsu in 2005, Wuxi Shixin Adhesive Tape Products Co., Ltd., mainly engaged in various adhesive tape products; We are Wholesale Closed-Cell Foam Sealants Suppliers andChina ODM Closed-Cell Foam Sealants Factory and Producer, after nearly 20 years of persistence and struggle, the company has grown vigorously and gradually expanded in scale. In 2018, we invested in a new factory in Suqian, Jiangsu, and established Jiangsu Shixin Adhesive Tape Products Co., Ltd.; At present, our company has become a high-tech enterprise integrating R&D, production and sales. The company has always firmly believed in the belief that "quality and reputation are the foundation of survival", continuously cultivating technical personnel, strengthening the development of new products, improving sales support, and striving to provide customers with better products and services.
Frequently Asked Questions
Frequently Asked Questions (FAQs)
- Q: What does 'closed-cell' mean for sealing effectiveness?
- A: Closed-cell means the internal cells of the foam are individual, sealed compartments. This prevents air, dust, and water from passing through the material, making it an effective gasketing and sealing material.
- Q: What is the recommended compression level for a water seal?
- A: For optimal water sealing, the foam should typically be compressed by 30% to 50% of its original thickness. Compression beyond 70% can lead to damage and diminished recovery.
- Q: How do PE, EVA, and NBR foams differ in application?
- A: PE (Polyethylene) is general purpose, cost-effective, and good for basic cushioning/sealing. EVA (Ethylene Vinyl Acetate) is more flexible and resilient. NBR (Nitrile Butadiene Rubber) or EPDM are chosen when resistance to oils, fuels, and high temperatures is required.
- Q: Are these foams suitable for structural bonding?
- A: No. Closed-cell foam sealants are designed for gasketing, sealing, and cushioning (filling gaps), not for primary structural joining. For structural bonding, specialized double-sided tapes (VHB-type) or liquid adhesives should be used.
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