High-Strength Hollow Glass Microsphere/Epoxy Resin Composite Insulation Materials for Deep In-Situ Condition Preserved Coring

Figure 5

HGM/EP composite insulation materials with different HGM volume fractions: (a) 10%, (b) 20%, (c) 30%, (d) 40%, (e) 50%, and (f) 60%.

(a)

(b)

(c)

(d)

(e)

(f)