A grease-like silicone material which provides a moisture proof seal for ignition and electrical systems. More water repellent than waxes. Effective from - 70F to 400F. A low-loss dielectric. Meets spec. MIL-I-8860.

• Tech Data Sheet (PDF)

The Dow Corning DC-4 Compound used for oil filter gaskets? Part # 09-27700
Yes, Dow Corning DC-4 is commonly on the rubber gasket on an oil filter for a new installation.

Can you use DC-4 on o rings used in avgas fuel systems?
It is not recommended. Parker O-Lube, our p/n 05-00773 would be a better choice.

What size is this Dow Corning DC-4 compound in ounces?
Part # 09-27700 is priced and sold as a 5.3 oz tube.

Can I use DC-4 on hydraulic brake master cylinder o-rings that use the red milspec hydraulic fluid?
A silicone base grease is recommended for o-rings in brake systems. We offer Dow Corning 55, our p/n 08-13684, which is listed in Cleveland's maintenance manual to lubricate cylinder o-rings. The information I found on DC4 does not indicate it can be used for hydraulic systems.