Alfa EPDM

PREPONDERANT CHEMICAL STRUCTURE
Unconjugated ethylene/propylene/diene terpolymer (propylene content approx. 20% to 55%, unsaturation approx. 2 ÷ 10%).

GENERAL PROPERTIES

Specific weight of raw elastomer: 0.85 ÷ 0.87
Specific weight of derived compounds: 1.02 ÷ 1.40
Shore A or IRHD hardness obtainable: 25 ÷ 90
Minimum service temperature: -20° C ÷ -35° C* (- 45° C) **
Maximum service temperature: +130° C (+150° C) **

FUNDAMENTAL PHYSICAL-MECHANICAL CHARACTERISTICS

• Good to excellent mechanical properties *
• Fair to excellent resistance to permanent deformation * **
• Fair to good abrasion resistance

Other properties

• Virtually zero flame resistance
• Fair air and gas impermeability
• Excellent dielectric properties **
• Outstanding resistance to UV radiation
• Excellent colorability

CHEMICAL BEHAVIOR

More than satisfactory with:

• water and steam up to 130°C (150°C) **
• seawater, salt solutions
• strong mineral bases and their solutions, dilute acids
• glycols and brake fluids derived from them
• alcohols, ketones and other oxygenated solvents
• ozone and atmospheric agents

Satisfactory with:

• strong mineral acids and their solutions
• vegetable or animal oils and fats
• phosphate ester-based hydraulic fluid

Completely unsatisfactory in the presence of:

• mineral oils and fats (except with formulations based on ultra-high molecular weight EPDM-OE oil-extended terpolymer)
• aliphatic, aromatic and chlorinated hydrocarbons
• silicone ester-based hydraulic fluids
• non-polar liquids in general

PECULIARITY

Absolute resistance to oxidation, weathering, ultraviolet radiation, ozone, even at high temperatures.

* depending on the types
** with specific optimal formulation