Compounds : For surface temps.
22R (soft) 0 - 15 deg. C/ 32 - 59 deg. F
25R (med. soft) 10 - 25 deg. C/ 50 - 77 deg. F
27R (medium) 15 - 35 deg. C/ 59 - 95 deg. F
32R (med. firm) 30 - 45 deg. C/ 86 - 113 deg. F
37R (firm) 40 - 60 deg. C/ 104 - 140 deg. F