Air curable ethylene/alpha-olefin/diene interpolymer composition

A composition comprising:

• a reaction product of a first composition comprising
• (A) an ethylene/propylene/5-ethylidene-2-norbornene interpolymer;
• a second composition comprising a reaction mixture comprising (B) an isocyanate comprising at least two isocyanate groups and (C) a TEMPO compound having the Structure I
• wherein R1, R2, R3 and R4 are each independently selected from H and C1-C6 alkyl groups and X is a functional group selected from the group consisting of OH or NH2;
• the composition comprises
• (B) from 0.5 wt % to 2.0 wt % of the isocyanate;
• (C) from 0.5 wt % to 2.0 wt % of the TEMPO compound;
• and
• (D) from 1.0 wt % to 2.0 wt % of a peroxide, wherein wt % is based on total weight of the composition,
• wherein the molar ratio of isocyanate groups of Component (B) to the functional groups of Component (C) is from 0.80 to 1.10;
• and
• the composition is a crosslinked composition and has
• (i) a MH-ML value from 14.00 dNm to 16.50 dNm, and
• (ii) a Finger Test rating from 2 to 3.