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April 23, 2009

EEstor has third party certification on Relative Permittivity for Supercapacitors



-- EEStor, Inc. announces third party certification tests by Texas Research International's Dr. Edward G. Golla, PhD., Laboratory Director. They certified that EEStor's patented and patent pending Composition Modified Barium-Titanate Powders have met and/or exceeded a relative permittivity of 22,500. This is a high relative permittivity which is good for EEStor's supercapacitors. EEStor's supercapacitors could hold more charge than a battery but have the quick discharge and recharge performance of capacitors.

Relative permittivity effects capacitance is explained at allaboutcircuits.

DIELECTRIC MATERIAL: All other factors being equal, greater permittivity of the dielectric gives greater capacitance; less permittivity of the dielectric gives less capacitance.

Material Relative permittivity (dielectric constant)
============================================================
Vacuum ------------------------- 1.0000
Air ---------------------------- 1.0006
PTFE, FEP ("Teflon") ----------- 2.0
Polypropylene ------------------ 2.20 to 2.28
ABS resin ---------------------- 2.4 to 3.2
Polystyrene -------------------- 2.45 to 4.0
Waxed paper -------------------- 2.5
Transformer oil ---------------- 2.5 to 4
Hard Rubber -------------------- 2.5 to 4.80
Wood (Oak) --------------------- 3.3
Silicones ---------------------- 3.4 to 4.3
Bakelite ----------------------- 3.5 to 6.0
Quartz, fused ------------------ 3.8
Wood (Maple) ------------------- 4.4
Glass -------------------------- 4.9 to 7.5
Castor oil --------------------- 5.0
Wood (Birch) ------------------- 5.2
Mica, muscovite ---------------- 5.0 to 8.7
Glass-bonded mica -------------- 6.3 to 9.3
Porcelain, Steatite ------------ 6.5
Alumina ------------------------ 8.0 to 10.0
Distilled water ---------------- 80.0
Barium-strontium-titanite ------ 7500





Here is a previous article on competing new batteries and ultracapacitors.
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