Description

Bromobutyl Rubber CAS NO 308063-43-6 is a halogenated butyl rubber, a synthetic elastomer modified with bromine to enhance its reactivity and performance characteristics. This modification is critical for achieving superior air impermeability, excellent heat and ozone resistance, and enhanced adhesion to other materials in demanding manufacturing processes. It is an essential raw material for industries requiring high-performance sealing and barrier properties, such as pharmaceutical packaging and automotive tire manufacturing.

Application

• Pharmaceutical Closures: Primary material for manufacturing sterile stoppers and septa for vials and syringes due to its exceptional gas and moisture barrier properties.
• Tire Inner Liners: Key component in tubeless tire construction for its outstanding air retention and durability.
• Industrial Hoses and Diaphragms: Used in applications requiring resistance to heat, ozone, and chemical permeation.
• Adhesive and Sealant Formulations: Serves as a base polymer for high-performance sealants and pressure-sensitive adhesives.
• Medical Device Components: Employed in parts requiring biocompatibility and resistance to sterilization processes.
• Vibration Damping Products: Used in automotive and machinery mounts for its excellent damping characteristics.

Basic Information

Product Name	Bromobutyl Rubber
CAS No.	308063-43-6
Molecular Formula	(C4H8)n·(C4H7Br)m
Molecular Weight	Varies (Polymer)
Synonyms	Brominated Isobutylene-Isoprene Rubber; BIIR; Bromo Isobutylene Isoprene Copolymer; Butyl Rubber, brominated; 1-Butene, 2-methyl-, polymer with 2-methyl-1,3-butadiene, brominated; Exxon Bromobutyl; Bromobutyl; Halogenated Butyl Rubber
EINECS	Contact for details

Quality Control

Our Bromobutyl Rubber is manufactured under a stringent quality management system. Each batch is tested against critical parameters including bromine content, Mooney viscosity, and cure characteristics to ensure consistent performance for your applications. Certificates of Analysis (COA) detailing full specifications are available upon request, supporting compliance with relevant industry and regulatory standards.

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 strong oxidizing agents and sources of heat or ignition. For long-term storage, it is recommended to store under an inert atmosphere to prevent premature curing or degradation.

Specification

Item	Specification
Appearance	Off-white to light amber slab or crumb
Bromine Content	1.5 - 2.5 % (w/w)
Mooney Viscosity (ML 1+8 @ 125°C)	30 - 55
Volatile Matter	≤ 0.7 %
Ash Content	≤ 0.5 %
Stabilizer Content	Contact for details
Cure Characteristics (MDR @ 160°C)	Contact for details

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