Page 337 - Handbook of Battery Materials

11.2 Separators for Lead–Acid Storage Batteries 307

Table 11.5 Microporous polyethylene pocket separators.

Brand name Backweb Electrical Oil Porosity Puncture Supplier
thickness a resistance content (%) strength (N)
2
(mm) (mΩ cm ) (%)
Daramic II 0.20–0.25 60 12 ± 3 60 9 Daramic, Inc
[60, 61]
Daramic High 0.15–0.20 50 12 ± 3 60 6 Daramic, Inc
Performance [60, 61]
EMARK 0.20–0.25 55 12 ± 3 60 6 Entek Int. LLC
[62, 63]
RhinoHide 0.15 50 13 ± 3 60 6 Entek Int. LLC
[62, 63]
Junfer PESep- 0.25 90 13 ± 3 60 n.a. b Jungfer GmbH
arator SLI & Co. KG [64]

a
Other backweb thicknesses request.
b n.a., not available.

Sinter PVC Separators Glass Leaf Separators
Cellulosic Separators
with Glassmat

Cellulosic Separators

Figure 11.18 Leaf type separators.
higher bending stiffness than for pocket separators, calling for thicker backwebs,
typically 0.4–0.6 mm (Figures 11.18 and 11.19).

11.2.2.2.1 Sintered PVC Separators The first synthetic separator is still in use
today in some geographical areas, for two reasons: this separator is unchallenged
in its low raw-material and production costs and it shows good stability against oxi-
dation at elevated temperatures and vibrations. However, its processing is difficult