Oleophobic Modification of Hollow Glass Microspheres and Its Effect on the Foaming Capacity and Stability of Foam Extinguishing Agent

Table 1

Effect of F8261 concentration on the oleophobic property of HGM.

/%	θ/°	/	Morphology of oil droplets on HGM surface
0	—	—	Oil droplets immediately penetrate the powder after contacting with the powder
0.1	78.5	36 s	Oil droplets are fattened-sphere shaped with short residing time
0.25	95.5	78 s	Oil droplets are fattened-sphere shaped with slightly short residing time
0.5	118.5	386 s	Oil droplets are hemispherical shaped with long residing time
0.75	121.0	>72 h	Oil droplets are roughly spherical shaped
1.0	132.5	>120 h	Oil droplets are spherical shaped
2.0	133	>120 h	Same as above