Permatex 81409 High-temp Red RTV Silicone 311g



Permatex 81409 High-temp Red Rtv Silicone Gasket Maker 311g

Permatex Hi-Temp RTV Silicone Gasket is a single
component, room temperature vulcanizing gasketing
compound designed to provide reliable “formed-in-place”
gaskets for mechanical assemblies. This material cures on
exposure to moisture in the air to form a tough, flexible, silicone
rubber gasket. The product resists aging, weathering and
thermal cycling without hardening, shrinking or cracking.
Designed to maintain maximum performance in a continuous
temperature environment of 600F. OEM Specified.
  • High temperature use
  • Superior adhesion and flexibility
  • Replaces most cut gaskets
  • Can be used as a gasket maker or dressing
  • Easy application
  • Non-flammable
  • Non-toxic
  • Drive housings
  • Exhaust manifolds
  • Thermostat housings
  • Valve covers
  • Timing gear covers
  • Water pumps
  • Differential covers

For assembly as a form-in-place gasket

  1. Remove all previous material from mating surfaces.
    Permatex Gasket Remover is recommended for most
    materials, not for plastics or painted surfaces.
  2. For best results, clean and dry all surfaces with a
    residue-free solvent, such as Permatex Brake and
    Parts Cleaner.
  3. Cut nozzle to desired bead size, 1/16“ to 1/4“ in
    diameter. An 1/8” bead is usually sufficient for most
  4. Remove cap, puncture tube or cartridge seal and attach
    extension nozzle.
  5. Apply a continuous and even bead of silicone to one
    surface, first tracing the internal areas of the gasket
    configuration, then all surrounding bolt holes
  6. Assemble parts immediately while silicone is still wet.
  7. Finger tighten flange only until material begins to seep
    out the sides of the flange.
  8. Allow to set for at least two hours and re-torque at lease
    one quarter to one half turn.
  9. For best results, allow to cure overnight

For assembly as a gasket dressing

  1. Repeat steps 1 thru 4 as in previous section.
  2. Apply a thin film of silicone to one surface to be
  3. Place the pre-cut gasket onto silicone film.
  4. Apply a second thin to pre-cut gasket surface.
  5. Remove any excess and assemble parts immediately.

Note: Product not recommended for use as a cylinder
head gasket or head gasket sealant.
Instructions for PowerBead

  1. Clean and dry all flange surfaces to be sealed.
  2. Remove black cap from top of extension nozzle.
  3. Turn nozzle extension one complete turn (360)
  4. Depress finger trigger and apply a continuous 1/16 inch
    to 1/8 inch PowerBead to one surface.
  5. Assemble parts immediately while silicone is still wet.
  6. Finger tighten flange only until material begins to seep
    out the sides of the flange.
  7. Allow to set for at least two hours and re-torque at least
    one quarter to one half turn.
  8. For best results, allow to cure overnight.
  9. To close, turn extension nozzle clockwise until tight
    (about one full turn). Wipe off excess material from
    nozzle and replace black cap.

Storage of Unused Product

  1. Create a “Silicone Plug” by allowing excess material to
    extend beyond the extension nozzle or aerosol tip to
    cure, sealing and protecting the remaining product from
    moisture. For reuse, simply remove the cured product
    from the tip.
  2. For PowerBead dispensers, you may store remaining
    product using either the above “silicone plug” method
    or using the included plastic cap

For Cleanup

  1. Remove uncured product from parts and hand-tools
    with Permatex® Brake and Parts Cleaner. If skinned
    over, break film with a dry cloth to remove as much as
    possible. Remove the remaining material with
    Permatex® Gasket Remover.
  2. Clean hands with a dry cloth or Permatex Fast
    Orange hand cleaner.


Permatex Hi-Temp RTV Silicone Gasket cures on exposure to
moisture in the air. The product dries tack free in one hour and
fully cures in 24 hours. Cure times will vary with temperature,
humidity and gap. Note: The curing process can cause
corrosion to some surfaces, for critical applications use the Ultra
Series silicones.
Chemical / Solvent Resistance

The product retains effective properties in contact with
automotive fluids, such as motor oil, transmission fluids,
alcohol, and antifreeze solutions. Note: Not recommended for
parts in contact with gasoline.

This product is not recommended for use in pure oxygen
and/or oxygen rich systems and should not be selected as
a sealant for chlorine or other strong oxidizing materials.
For safe handling information on this product, consult the
Material Safety Data Sheet, (MSDS).

Products shall be ideally stored in a cool, dry location in
unopened containers at a temperature between 8 to 28C
(46 to 82F) unless otherwise labeled. Optimal storage is at the
lower half of this temperature range. To prevent contamination
of unused product, do not return any material to its original
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