Description

Butyl Rubber is a synthetic elastomer renowned for its exceptional impermeability to gases and moisture, making it a cornerstone material for critical sealing applications. Its superior resistance to heat, ozone, and weathering ensures long-term performance and reliability in demanding environments. This polymer is essential for manufacturers in the automotive, pharmaceutical, and construction industries seeking durable, airtight sealing solutions.

Application

• Tire Inner Liners and Tubeless Tire Seals: The primary application, leveraging its excellent air retention properties to maintain tire pressure.
• Pharmaceutical Stoppers and Septa: Used for vial and syringe closures due to its high purity, low extractables, and exceptional resealing capability.
• Automotive Hoses, Gaskets, and Dynamic Seals: Provides reliable performance in engine bays and fluid systems resistant to heat and various chemicals.
• Construction Sealants and Roofing Membranes: Offers outstanding weather resistance and durability for long-lasting waterproofing.
• Industrial Hose and Belting: Used in applications requiring resistance to abrasion, ozone, and flex cracking.
• Adhesive and Caulking Compounds: Serves as a base polymer for formulations requiring good adhesion and flexibility.
• Vibration Damping Components: Utilized in machinery mounts and automotive components for its energy absorption properties.
• Chewing Gum Base: Food-grade butyl rubber acts as a non-toxic, inert masticatory substance.

Basic Information

Product Name	Butyl Rubber
CAS No.	308063-42-5
Molecular Formula	(C4H8)n·(C9H12)m (Copolymer of isobutylene with isoprene)
Molecular Weight	Varies (High Polymer)
Synonyms	IIR (Isobutylene Isoprene Rubber); Poly(isobutylene-co-isoprene); GR-I; Exxon Butyl Rubber; JSR Butyl; Bromobutyl Rubber (Halogenated grade); Chlorobutyl Rubber (Halogenated grade); Isobutylene-Isoprene Copolymer
EINECS	Contact for details

Quality Control

Our Butyl Rubber is manufactured under a strict quality management system. Each batch is tested against key parameters such as unsaturation (isoprene content), molecular weight, and Mooney viscosity to ensure consistent performance. Certificates of Analysis (COA) detailing these specifications are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from sources of heat, sparks, and open flame. Protect from direct sunlight and moisture to prevent premature aging or clumping.

Specification

Item	Specification
Appearance	Off-white to translucent slab or crumb
Mooney Viscosity (ML 1+8 @ 125°C)	30 - 70 (Grade dependent)
Unsaturation (Mol %)	0.7 - 2.5 (Grade dependent)
Volatile Matter (%)	≤ 0.7
Ash Content (%)	≤ 0.5
Stabilizer Content	Non-staining or staining type available

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.