What is butyl IIR?
Butyl rubber is composed by copolymerizing isobutylene which is with small amount of isoprene. It is like EPDM possessing excellent resistance to chemical and polar fluid, outstanding electrical insulation and good ozone resistance.
Butyl Rubber (IIR) Physical Properties
Butyl Rubber (IIR) exhibits excellent elasticity, low gas permeability, and outstanding aging resistance. Its typical glass transition temperature is approximately -70°C, enabling it to maintain elasticity in low-temperature environments. Butyl rubber possesses relatively high viscosity and density, along with strong abrasion resistance and tear strength.
Butyl Rubber (IIR) Chemical Properties
Chemically, Butyl Rubber (IIR) exhibits good resistance to oxygen, ozone, and various chemicals including acids, alkalis, and solvents. These properties ensure stable performance in corrosive environments with minimal chemical degradation. Its saturated carbon chain structure provides superior oxidation resistance, extending its service life.
Butyl Rubber (IIR) Advantages
Butyl Rubber (IIR) holds a unique position in the rubber industry due to its distinctive properties. It offers chemical stability, water resistance, high insulation, excellent gas impermeability, and resistance to acids and alkalis. The content of isoprene in its molecular structure and the method of halogenation significantly influence its performance characteristics. For instance, chlorinated butyl rubber demonstrates notable advantages in vulcanization speed, compatibility with unsaturated rubbers, and both self-adhesion and inter-adhesion properties. These outstanding characteristics enable butyl rubber to play a vital role across numerous application fields.
Applications of Butyl Rubber (IIR)
Butyl Rubber (IIR) is widely used across multiple industries due to its excellent air impermeability, heat resistance, ozone resistance, and chemical stability. These performance advantages make IIR rubber an essential material for demanding industrial and commercial applications.
Tire Industry
The tire sector is the largest consumer of Butyl Rubber (IIR). It is the core material for tire inner tubes and tire inner liner compounds, especially halogenated butyl rubber (CIIR and BIIR). These materials are extensively used in automobile, truck, and aircraft tires. In China, tire-related applications account for approximately 84.6% of total butyl rubber consumption, primarily for air retention layers that enhance tire safety and durability.
Pharmaceutical Packaging
Butyl rubber is widely used in pharmaceutical closures, such as rubber stoppers for injectable vials and infusion bottles. Owing to its chemical inertness and low extractables, IIR ensures drug safety and stability. Medical packaging applications represent about 10.5% of domestic butyl rubber consumption.
Construction Waterproofing
In the construction industry, butyl rubber membranes and self-adhesive butyl tapes are used for roofing systems, underground structures, and waterproof sealing. The material offers outstanding weather resistance, aging resistance, and extremely low water vapor permeability, making it ideal for long-term waterproofing solutions.
Sealing Materials
Butyl-based hot melt sealants are commonly applied in insulating glass secondary sealing, photovoltaic module edge sealing, and automotive lighting systems. These sealants provide long-lasting adhesion, excellent UV resistance, and reliable air and moisture sealing performance.
Other Applications
Beyond the above sectors, Butyl Rubber (IIR) is also used in chewing gum base (non-nutritive gum base), wire and cable insulation, vibration damping materials, rubber dams, and anti-corrosion rubber products, further demonstrating its versatility across industrial fields.