Butyl Rubber (IIR, Isobutylene Isoprene Rubber, CAS 9010-85-9) exhibits excellent compatibility with polar media, acids, alkalis and non-oxidizing chemicals, but poor tolerance to non-polar solvents, with clear grade-specific differences critical for industrial procurement.
Core Principles of Butyl Rubber Chemical Compatibility
Molecular Structure-Driven Compatibility Traits
Butyl Rubber's (IIR) saturated polymer chain and low polarity determine its chemical compatibility: it resists polar substances but is swollen by non-polar media. Its dense molecular structure reduces chemical penetration, with a permeability rate 7 times lower than natural rubber, ensuring 90% structural stability after 30 days of contact with compatible chemicals. Tianjin Gnee Biotech Co. Ltd. optimizes its butyl rubber formulation to enhance this inherent compatibility for industrial applications.
Compatibility with Acids & Alkalis: Key Industrial Application Advantage
Tolerance to Common Corrosive Aqueous Media
Butyl Rubber (IIR, CAS 9010-85-9) demonstrates excellent compatibility with dilute acids and weak alkalis, the core reason for its use in chemical sealing. It maintains ≥90% tensile strength after 30 days of continuous immersion in 10% dilute sulfuric acid and 5% sodium hydroxide, with volume swelling below 4%. Industrial-grade butyl rubber sheets and gaskets from Tianjin Gnee Biotech Co. Ltd. retain this performance, making them ideal for chemical tank liners and pipeline seals.
Compatibility with Solvents: Polar vs. Non-Polar Differentiation
Butyl Rubber excels with polar solvents (water, ethyl alcohol, glycol), showing volume swelling <1% after 72 hours and retaining ≥95% tensile strength. However, it has poor compatibility with non-polar solvents (gasoline, mineral oil, aromatic hydrocarbons), with volume swelling exceeding 35% and tensile strength dropping to ≤55% in short-term contact. This limits raw butyl rubber from oil-contact applications, where nitrile rubber is preferred.
Compatibility with Oils & Oxidizable Chemicals
Suitability for Food, Pharmaceutical & Industrial Scenarios
Butyl Rubber (including CIIR and BIIR grades) exhibits good compatibility with animal and vegetable oils, with volume swelling of 5-10% and tensile strength retention ≥80% after 72 hours of contact. It also resists oxidizable chemicals (e.g., hydrogen peroxide, sodium hypochlorite at low concentrations), making medical-grade butyl rubber from Tianjin Gnee Biotech Co. Ltd. suitable for pharmaceutical stoppers and food processing equipment seals (meeting USP Class VI standards).
Grade-Specific Compatibility Differences
Standard IIR vs. CIIR vs. BIIR
While all butyl rubber grades share core compatibility traits, minor differences exist: Chlorinated IIR (CIIR) and Brominated IIR (BIIR) have slightly better compatibility with weak oxidants (tensile strength retention ≥85% vs. 80% for standard IIR). Standard IIR (unmodified) is most cost-effective for general chemical sealing, while CIIR/BIIR from Tianjin Gnee Biotech Co. Ltd. are preferred for applications requiring enhanced compatibility with mild corrosives.
Practical Compatibility Testing & Procurement Tips
Ensuring Material Suitability for Industrial Use
Before procurement, test butyl rubber compatibility with target chemicals using ASTM D471 standards (immersion test at 25℃ for 72 hours). 60% of premature butyl rubber product failures stem from ignoring compatibility checks. Tianjin Gnee Biotech Co. Ltd. provides free compatibility testing reports for its butyl rubber products, helping buyers avoid costly mistakes and ensure optimal material selection.
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