What is IIR rubber?
The abbreviation IIR stands for isobutylene isoprene rubber. Polyisobutylene, also known as "PIB" or polyisobutene, (C4H8)n, is the homopolymer of isobutylene, or 2-methyl-1-propene, on which butyl rubber is based. Butyl rubber is produced by polymerization of about 98% of isobutylene with about 2% of isoprene.
How long does IIR rubber last?
The service life of IIR rubber is influenced by its specific application, environmental conditions (such as temperature, UV exposure, and chemical exposure), and whether it is pure raw rubber or a compound product. Its service life can be referenced within the following ranges:
- General Service Life Range: Under conventional application conditions, the service life of IIR rubber typically ranges from 5 to 15 years.
- Advantages in Aging Resistance: Benefiting from its excellent ozone resistance, aging resistance, and weatherability, IIR rubber performs exceptionally well in outdoor or harsh environments. For instance, data indicates its ozone resistance is approximately 10 times higher than natural rubber, enabling prolonged exposure to sunlight and air without significant aging.
- Performance in Specific Applications: In fields demanding high durability, such as waterproofing membranes, butyl rubber products can exceed a 10-year service life.
What is the density of IIR rubber?
IIR – Butyl rubber IIR Density: 1.27 g/cm³ CIIR – Chlorobutyl rubber CIIR Density: 1.3 g/cm³
Applications of IIR Rubber
The numerous excellent properties of IIR rubber enable its extensive use across various fields:
Automotive Tires: Due to its outstanding airtightness and aging resistance, IIR is widely used in manufacturing automotive inner tubes. Inner tubes made from IIR effectively slow gas permeation, extending tire service life. Additionally, IIR is employed in producing tire sidewalls and vulcanized capsules.
Sealing Materials: IIR's outstanding elasticity and airtightness make it ideal for manufacturing various sealing gaskets and packing materials. These materials play a critical role in preventing gas or liquid leaks in industries such as petroleum and chemical processing.
Soundproofing Materials: IIR's excellent sound insulation properties make it commonly used in the production of soundproofing materials for automobiles, buildings, and other applications. These materials significantly reduce noise pollution, providing people with quieter work and living environments.
Cable Materials: IIR's excellent electrical insulation, moisture resistance, and water resistance make it suitable for manufacturing insulation layers and protective sheaths for wires and cables. This finds extensive application in power transmission, telecommunications, and related fields.
Waterproofing Materials: IIR waterproofing membranes are widely used in construction projects due to their resistance to aging, corrosion, and superior waterproofing properties. They effectively prevent moisture from infiltrating building interiors.