Table 1. Recipe of the Thermally Expandable Microspheres (phm)

Materials	SS-SOL 30E	SS-SOL 30F	SS-SOL 60	SS-SOL 100
AN	60	60	60	60
MAN	15	15	15	15
MAA	25	25	25	25
Hydrocarbon	15	15	15	15
Initiator	1.0	1.0	1.0	1.0
Cross-linking Agent	0.5	0.5	0.5	0.5
Colloidal Silica	20	20	20	20
Water	300	300	300	300