High-Temp FME Foam Plugs — Heat-Rated Debris Exclusion Sponges to 500°F (Safe-T-Sponge®)

Keep debris out when the metal is still hot — rated to 500°F

High-Temp FME foam plugs are built for work the standard sponges can't take. A different high-temperature foam composition is fully encased in flame-retardant laminate, giving a continuous rating of 500°F (260°C) — more than double the 212°F limit of the standard line. That means you can seal openings during and right after hot work, on warm turbines, steam and exhaust systems, and heat-treat operations, without pulling the plug just to wait for cooldown.

Why High-Temp

• 500°F (260°C) continuous rating — the only Safe-T-Sponge round good above 212°F.
• High-temperature foam core (a different material than the standard sponges), fully encased in flame-retardant laminate on every face.
• Added spark and abrasion resistance from the sealed flame-retardant skin.
• Same fast FME workflow — compression fit, loop-pull removal, no pump or tools needed.
• Low-halogen, low-metals construction — documented low-contaminant standard, independent lab testing, lot-number traceability.
• Patented design, made in the U.S.A.

Where they're used

Post-weld FME before full cooldown, steam turbine overhauls, boiler and exhaust systems, heat-treatment work, and any hot piping, tubing, or valve opening where Foreign Object Damage (FOD) is a risk and temperatures exceed the 212°F limit of standard sponges.

Specifications

• Shape: Round plug, high-temp foam core fully encased in flame-retardant laminate
• Sizes listed here: 5"–24" outside diameter (127 mm–610 mm)
• Max temperature: 500°F (260°C) continuous
• Sold: individually (each)
• Lead time: made to order, about 5 business days.
• Origin: Made in U.S.A. · Patented (U.S. Pat. 6,506,014 / 6,824,356 / 7,533,698)

Use & care (always follow site FME procedures)

• Choose a size that seats snugly with compression but still inserts and retracts easily; position the loop below any tooling used afterward and keep it centered.
• Inspect before, during, and after use; account for and replace any damaged plug.
• Vacuum loose debris before retracting the plug.
• Rated for high heat, but keep away from direct welding slag, grinding sparks, open flame, and ignition sources.
• Avoid acetone and alcohol-based solvents and oils — they can weaken the laminate bond. Don't soak or immerse. Don't step on or cut the plug.
• Attach a lanyard per your site standards — required for vertical-down applications.

Need 26"–30" or a custom high-temp size? Larger High-Temp plugs are made to order — request a quote and we'll price it for you.

Need a Safety Data Sheet (SDS), certificate of compliance, or RFID-tagged sponges? Add a note to your order or contact us and we'll provide documentation.