Super Flex® 304-L Stainless Steel

Super Flex 304-L

      America's First Flexible Liner...since 1978

Sleepy Hollow upgraded SUPER FLEX® from type 304 to type 304-L late in 1983. This more expensive, less readily available alloy was chosen to provide greater protection in the event of repeated chimney fires—eliminating the hazard of intergranular corrosion. Removing the carbon content accomplishes three things:

1. Elimination of chromium carbides (carbon combining with chrome at high temperatures).
2. Less carbon increases the chrome and nickel content, increasing corrosion resistance.
3. Reducing carbon content makes the stainless slightly softer, enabling it to drill, cut,
and form easier as evidenced by our unique oval chimney liner series.

Type 304-L stainless steel is a non-magnetic alloy with a carbon content of .03 maximum,
chrome content of 18/20, and nickel content of 8/12. Using mill-certified stainless purchased from specialty mills ensures the highest quality stainless alloy available. Our SUPER FLEX® carbon content usually runs about .013 maximum, with small amounts of moly present, ingredients not found in grades of stainless used for many of today's chimney liner systems.

*Prices are per foot.