Butyl Rubber (IIR, Isobutylene Isoprene Rubber, CAS 9010-85-9) is a saturated synthetic elastomer with exceptional airtightness, chemical resistance, and weatherability, widely used in industrial sealing, automotive, and construction, with clear performance parameters and supplier selection criteria for buyers.
What Is Butyl Rubber (IIR, CAS 9010-85-9)? Core Definition & Manufacturing Process
Chemical Composition & Industrial Manufacturing Process
Butyl Rubber (IIR) is a synthetic elastomer produced by cationic polymerization of 98% isobutylene and 1-2% isoprene (per industrial standards), with CAS number 9010-85-9. The slurry method (using methyl chloride as diluent, reaction temperature -100℃) accounts for 90% of global production, while the solution method is used for high-end modified grades. Industrial-grade butyl rubber is supplied as solid sheets or granules, with a density of 0.92 g/cm³, making it lightweight yet durable for diverse industrial applications.
Properties of Butyl Rubber (IIR) for Industrial Applications
Butyl Rubber's unique properties make it irreplaceable in many industrial scenarios: it has ultra-low gas permeability (0.01-0.03 cm³·mm/(m²·d·atm)), 7 times lower than natural rubber, ensuring superior airtightness. It maintains 90% of tensile strength (15-25 MPa) after 30 days of immersion in dilute acids/alkalis, with a shore hardness of 60±5° Shore A and continuous working temperature of -40℃ to 120℃. Its compression set is ≤20% after 72 hours at 100℃, ensuring long-term sealing stability for industrial gaskets and seals.
Butyl Rubber (IIR) Key Performance Parameters Table
|
Performance Parameter |
Standard IIR (Industrial Grade) |
Chlorinated IIR (CIIR) |
Brominated IIR (BIIR) |
Test Standard |
|---|---|---|---|---|
|
CAS Number |
9010-85-9 |
68441-14-5 |
68084-34-6 |
ASTM D1418 |
|
Tensile Strength |
15-25 MPa |
18-28 MPa |
20-30 MPa |
ASTM D412 |
|
Shore Hardness (Shore A) |
60±5° |
65±5° |
65±5° |
ASTM D2240 |
|
Continuous Working Temperature |
-40℃ to 120℃ |
-35℃ to 125℃ |
-35℃ to 130℃ |
ASTM D865 |
|
Gas Permeability |
0.01-0.03 cm³·mm/(m²·d·atm) |
0.015-0.035 cm³·mm/(m²·d·atm) |
0.015-0.035 cm³·mm/(m²·d·atm) |
ASTM D1434 |
|
Water Absorption Rate (72h) |
<1% |
<1.2% |
<1.2% |
ASTM D570 |
|
Compression Set (72h/100℃) |
≤20% |
≤18% |
≤18% |
ASTM D395 |
Industrial Applications & Uses of Butyl Rubber (IIR)
The automotive industry accounts for 60-70% of global butyl rubber consumption, primarily for tire inner tubes (40% of automotive usage) and engine gaskets-its low permeability keeps tires inflated 5-8 times longer than natural rubber. In construction, butyl rubber waterproof membranes (service life 25-30 years) are used in 80% of high-end roof waterproofing projects. Pharmaceutical buyers use medical-grade butyl rubber (USP Class VI compliant) for 80% of injectable vial stoppers, while industrial sealing relies on its chemical resistance for chemical tank liners and pipeline gaskets.
Key Types of Butyl Rubber for Industrial Procurement
Grade Selection Guide for Different Industrial Needs
Industrial buyers should focus on three core grades: Standard IIR (unmodified) for general sealing (45% of procurement), Chlorinated IIR (CIIR, 1.1-1.3% chlorine content) for improved adhesion in tire inner liners, and Brominated IIR (BIIR, 2% bromine content) for faster vulcanization (30% used in high-performance seals). Regenerated butyl rubber is a cost-saving option, reducing material costs by 20-30% for non-critical applications like low-stress gaskets.
2026 Butyl Rubber Pricing & Cost-Saving Tips for Buyers
Regional Pricing Data & Procurement Strategies
As of Q1 2026, global butyl rubber prices (FOB) are: China $2509/MT, USA $2615/MT, Germany $2560/MT, India $2057/MT. Prices are tied to isobutylene raw material costs. Buyers can save 10-15% by purchasing bulk orders (MOQ ≥10 MT) and choosing regional suppliers to cut freight costs. Blending 20-30% regenerated butyl rubber with virgin material reduces costs without significant performance loss for non-critical parts.
Supplier Selection Guide for Industrial Butyl Rubber Buyers
Critical Criteria to Ensure Quality & Reliability
When selecting a butyl rubber supplier, prioritize three factors:
- Quality Certification: Require ISO 9001 certification and COA (Certificate of Analysis) for CAS 9010-85-9 compliance.
- Supply Capacity: Choose suppliers with annual production ≥50,000 MT to avoid stockouts.
- After-Sales Support: Opt for suppliers offering technical guidance on formulation and a 6-month warranty for defective products. Uncertified suppliers can increase replacement costs by 40% due to inconsistent quality.
Butyl Rubber Supplier (IIR CAS 9010-85-9)-Tianjin Gnee Biotech Co. Ltd.
We supply high-quality Butyl Rubber (IIR, CAS 9010-85-9) for tire manufacturing, sealing systems, construction waterproofing, wire and cable applications, and industrial rubber products.
- Stable Industrial Quality
- Factory Competitive Price
- Global Export Experience
- Technical Documents (COA / MSDS)
- Custom Specifications Available