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Technical Data Sheet
Vibra-Tite® 998
RTV Black Silicone
October 2016
Technical data contained within this document is intended for reference only
For assistance and recommendations on specifications for this product, contact ND Industries
info@ndindustries.com
10/14/2016 Page 1 of 1
Product Description
Vibra-Tite 998 Black Silicone Sealant is a one-part
acetoxy cure silicone sealant with high temperature
resistance that cures in the presence of atmospheric
moisture to produce a durable and flexible silicone
rubber compound.
Typical Applications
Vibra-Tite 998 Sealant provides a long-lasting
flexible seal with excellent adhesion to most surfaces.
This sealant is intended for a variety of general
purpose and industrial applications and retains its
elastomeric properties at temperatures from -65 to
500 F (-53 to 260 C.).
Technical Features
Specially designed for automotive applications such
as sealing exhaust manifolds; turbo housings; oxygen
sensors; adhering auto and appliance trim; providing
form-in-place gaskets for gear boxes, compressors &
pumps; sealing trailers and truck cabs; bonding and
sealing appliance parts.
The consistency of Vibra-Tite 998 Sealant remains
uniform over a wide range of temperatures. It may
be applied in sub-zero weather without loss of
extrusion or physical properties.
Vibra-Tite 998 Sealant retains its elastomeric
properties at temperatures from -65 to 500 F and
can be used for intermittent exposure at temperatures
up to 600 F.
Limitations
Vibra-Tite 998 Sealant is not recommended for use in
the following applications:
Do not use silicone gasket maker only when
replacing head gaskets.
Do not use on parts continuously immersed
in gasoline.
Glazing or edge sealing of insulated glass.
Structural glazing.
Aquariums
Copper or brass. The cure byproduct may
discolor these surfaces.
Totally confined spaces. Because the sealant
needs atmospheric moisture to cure.
Surfaces that require painting. Paint will not
adhere to most silicone surfaces.
Properties
Sag or Slump: Nil
Color: Black
Specific Gravity: 1.3
Tack-free time: <1 hr (@ 77 F, 50% RH)
Curing time: 24 hrs (@ 77 F, 50% RH, ¼” bead)
Durometer hardness, Shore A: 26-40
Meets GM Specification: 9985985
Procedure for Application
1. Clean and dry surfaces. Surfaces should be free of
dirt, grease, oil and old gasketing material.
2. Remove cap, puncture inner seal, screw on
extension nozzle and cut nozzle to desired bead
width.
3. Apply an approximate 1/8” unbroken bead to one
surface, completely encircle all bolt holes.
4. Assemble parts while material is tacky (approx. 5
to 10 minutes). Do not over tighten bolts. Material
skins within 15 minutes.
5. May be applied to both sides of gasket to use as a
pre-cut gasket dressing.
6. Allow to cure for at least 15 minutes. Material
normally fully cures in 24 hours.
7. Remove nozzle and replace cap after use.
Shelf Life
When stored in original, unopened containers at or
below 90 F (32 C) Vibra-Tite 998 Sealant has a
minimum shelf life of 12 months from the date of
manufacture.
General Information
Health & Safety in use
Because of solid content, use of gloves and goggles
are recommended.
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