Dielectric Strength of Various Materials

Material	Dielectric Strength (V/m)
Air	3e6
Bakelite	24e6
Neoprene rubber	12e6
Nylon	14e6
Paper	16e6
Polystyrene	24e6
Pyrex glass	14e6
Quartz	8e6
Silicone oil	15e6
Strontium titanate	8e6
Teflon	60e6