Description

Butyl Rubber is a synthetic elastomer, a copolymer of isobutylene with a small percentage of isoprene, known for its exceptional impermeability to gases and moisture. This unique property makes it the material of choice for critical sealing applications where maintaining an internal atmosphere is paramount. It is an essential raw material for manufacturers in the automotive, pharmaceutical, and construction industries seeking reliable, long-lasting performance in demanding environments.

Application

• Tire Inner Liners and Tubeless Tire Seals: The primary global application, leveraging its superior air retention to maintain tire pressure and improve fuel efficiency.
• Pharmaceutical Stoppers and Septa: Used for vial and syringe closures due to its high purity, low extractables, and excellent resealing properties.
• Industrial Hose and Diaphragms: For handling gases, vacuum applications, and corrosive chemicals where flexibility and impermeability are critical.
• Construction Sealants and Adhesives: Provides durable, weather-resistant seals for glazing, roofing, and expansion joints.
• Automotive Vibration Dampers and Bushings: Offers good damping characteristics for noise, vibration, and harshness (NVH) control.
• Sporting Goods: Used in bladders for sports balls (e.g., basketballs, footballs) and inflatable products.

Basic Information

Product Name	Butyl Rubber
CAS No.	9010-85-9
Molecular Formula	(C4H8)x(C5H8)y
Molecular Weight	Varies by grade and isoprene content
Synonyms	IIR (Isobutylene Isoprene Rubber); Poly(isobutylene-co-isoprene); Butyl Polymer; GR-I; Exxon Butyl Rubber; JSR Butyl; Bromobutyl Rubber (Halogenated derivative); Chlorobutyl Rubber (Halogenated derivative)
EINECS	Contact for details

Quality Control

Our Butyl Rubber is manufactured under a stringent quality management system. Each batch is tested against key parameters such as unsaturation (isoprene content), molecular weight, and Mooney viscosity to ensure consistent performance. While specific grades may conform to various industry standards, Certificates of Analysis (COA) detailing lot-specific results 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 heat sources, open flames, and strong oxidizing agents. For long-term storage, keep in the original packaging to prevent contamination.

Specification

Item	Specification
Appearance	Off-white to translucent slab or pellet
Mooney Viscosity (ML 1+8 @ 125°C)	Grade dependent (e.g., 45 ± 5, 55 ± 5)
Unsaturation (Mol %)	0.7 - 2.5 (Grade dependent)
Volatile Matter (%)	≤ 0.7
Ash Content (%)	≤ 0.5
Stabilizer Content	Contact for details

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