Insulation

Nature		Damma 700	Mica rexMM600	Mica rexMM400	MyorexPMX561	PGE-6771	Micro therm	Bake board
General	Principal component	Micro Mica Silicon	Mica glass	Mica glass	Glass fiber	Glass fiber	Ultrafine silica	Paper phenol
	Density (g/cm3)	2.1	2.73	2.63	2.0～2.2	1.8	0.25	1.75
	Water absorption rate(％)	0.5	0.014	0.004	4.0～6.0	0.1	–	0.7
machine	Bending strength (MPa)	120	75.9	89.6	44～54	490	–	118
machine	Compressive strength (MPa)	300	221	310	117～147	588	–	49
Electricity	Volume resistivity (Ω･cm)	1.0×1013	1×1014	1×1012	1.0×1012	2.0×1015	–	1.0×103
	Permittivity (ε)	2.85	6.8	6.7	–	–	–	5.5
	Dissipation factor (tan δ)	0.38	0.0017	0.0018	–	–	–	–
	Breakdown voltage (KV/mm)	33	15	15.8	3	27	–	13
Heat	Heatproof temperature (℃)	700	600	400	700	180	1000	140
	Coefficient of thermal expansion (/℃) (RT～400℃)	9～12×10-6	7×10-6	7×10-6	9.0×10-6	1.6×10-4	–	–
	Thermal conductivity (W/m･k)	0.58	1.42	1.24	1.21	0.59	0.02	0.21