Table 4. Silica Content of the T-1 to T-4 WMB and Payne Effect (∆G’) of the T-1 to T-4 Compounds

	T-1	T-2	T-3	T-4
Silica content in WMB (phr)	99.0	98.7	99.2	99.3
∆G’ (MPa)
G’ at 0.3% strain - G’ at 40% strain	1.5	1.6	3.6	4.3