Firstly... What is Butyl?
Butyl rubber (IIR), also called isobutylene-isoprene rubber, is a synthetic rubber and copolymer of isobutylene with isoprene. Butyl rubber is produced by polymerization of about 98% of isobutylene with about 2% of isoprene. It is a colorless viscoelastic material which is odorless, tasteless, has excellent impermeability and has good flex properties due to the long polyisobutylene segments of its polymer chains.
Butyl rubber has excellent resistance to oxygenated solvents (ketones and alcohols), alkalis, flexing, and abrasion, has exceptional resistance to gas and moisture (water and steam) permeation and is capable of providing high energy absorption (damping) and thus has excellent electrical isolation performance. Butyl has good resistance to sunlight, ozone, heat aging, animal and vegetable oils, oxidizing chemicals, silicone fluids and greases, ammonia, hydrazine, and phosphate ester type hydraulic fluids. The molecular structure of butyl rubber can be oriented to resist stress. Mechanical properties are retained over a relatively wide stiffness range since reinforcement is not required for good tensile and tear strength.
Typical service temperature range between -60°c to +130°c
Flame resistance is poor. Butyl is not recommended for use with petroleum oils, fluids, or solvents. Butyl has poor resistance to aromatic hydrocarbons, aliphatic hydrocarbons, coal, tar, and diester-based lubricants.
We use Butyl liners in our Brewflex hose range because of these advantages. None of the limitations listed here affect its performance in food and beverage applications. Compared to other liner materials such as NBR, Butyl out-performs considerably. It is high quality, durable, flexible and is odorless and tasteless meaning it will not affect your beer or cider. It is also worth noting that it will not be broken down by the media that flows through it (in a food/beverage application) and so will not contaminate your product.