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Battery Separator Properties Chart 

Typical Properties 


PPG Silica Grades 
Manufacturing Location Oil Absorption
(ml/100g)
BET Surface Area
(m 2/g)

pH 

Tamped Density
(g/l)

Median Particle Size
(µm)
Hi-Sil™ SBG USA 185 - 215 155 - 185 6.5 - 7.3 160 15
Hi-Sil™ WB10 USA 195 - 225 150 - 200 6.5 - 7.5 142 18
Hi-Sil™ WB37 USA 245 - 265  160 - 190 6.5 - 7.5 245 41
Hi-Sil™ WB10D Netherlands 210 - 240 160 - 200 6.3 - 7.5 175 25
Hi-Sil™ WB35D Netherlands 230 - 250 145 - 175 6.5 - 7.5 140 23
Test Method Notes
  • BET surface area values for WB10D and WB35D are measured by 5 point BET
  • BET surface area values for SBG, WB310 and WB37 are measured by 1 point BET
  • Oil absorption values are measured using a Brabender Absorptometer E
  • Particle size values were measured using Laser Light scattering
  • Values for tamped density and mean particle size are typical values