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Speedline RTV Adhesive/Sealant 73-20 Silicone Speedline RTV Adhesive/Sealant
73-20 Silicone
Description
Speedline 73-20 RTV Adhesive/Sealant
is a one-part, paste-like material that
cures to a tough, flexible solid upon
moisture/air exposure.
Speedline 73-20 RTV Adhesive/Sealant
will not slump under its own weight; it is
therefore suitable for applications to
overhead or vertical surfaces without
detrimental sag, runs or slumps. It pro-
vides a strong adhesion to most types
of clean PVC (and other plastics), metal,
wood, silicone rubber and ceramic sur-
faces.
Speedline 73-20 RTV Adhesive/Sealant
is very resistant to outdoor exposure,
moisture, ozone and vibration. It also is
resistant to high and low temperatures.
It may be applied in sub-zero conditions
without loss of its normal properties. It
will withstand extended exposure from
-76° F (-60° C) up to 450° F (232° C),
and for short periods as high as 500° F
(260° C).
Speedline 73-20 RTV Adhesive/Sealant
is available in colors of aluminum and
white, as well as clear.
Use
Speedline 73-20 RTV Adhesive/Sealant
is commonly used to:
Seal joints between layers of plastic
or layers of metal and plastic.
Attach screwless fastenings to metal,
wood or plastic.
Bonded gasketing in heating and re
frigeration applications.
Compliance
Speedline 73-20 RTV Adhesive/Sealant complies with
the following codes and standards:
MIL-A-46106A, Amend 2, Type 1
Meets the requirements of FDA Regulation No. 21 CFR
177.2600 subject to end use compliance with limitations.
Meets the requirements of USDA for use in Federally
inspected meat and poultry plants.
Physical Properties*
Property
Test Method
Value
Specific Gravity
@77°F (25°C)
ASTM 792
1.04
Durometer Hardness,
Shore A
ASTM D412
30
Tensile Strength,
psi
ASTM D412
350
Elongation
ASTM D412
500%
Brittle Point
ASTM D746
-100°F
(-73°C)
*
All tests on 0.075" slab cured 72 hrs. at 77°F (25°C).
Tack Free
15 min.
Full Cure
24 hrs.
Shelf Life
12 months
Speedline
®
73-20 RTV Adhesive Sealant
Type ......................................... One-part silicone rubber
Form ................................................ Nonslumping paste
Cure ......... Cures on exposure to water vapor in the air,
giving off small amounts of acetic acid
Properties ....... Can be applied to vertical and overhead
surfaces without sag or run-off
General Use ............ As a sealing or bonding adhesive
or gasketing
73-20 Caulk - 7/03 - Page 1 Application Details:
Speedline 73-20 RTV Adhesive/Sealant is
furnished ready for use directly from the con-
tainer/tube. It is a one-part material that will
cure to a tough, flexible rubber once released
from its container and exposed to moisture/
air. It flows freely from the tube under pres-
sure and can be easily tooled with a metal,
plastic or wood tool.
Cure
The curing process of 73-20 RTV Sealant
star ts with its exposed surface and
progresses inward; an initial tack-free skin
forms shortly across the exposed surface. At
75° F (24° C) and 50% relative humidity a
skin will form in about 20 minutes. Any re-
quired tooling should be enacted prior to the
skin starting to form; it is also necessary to
remove any masking tape if it is used along
the edges of the application area. Tooling and
the removal of masking tape should be lim-
ited to the first 5 or 10 minutes. The curing
process is directly affected by the moisture
exposure; greater or lesser relative humidity
will speed up or slow down the cure process.
Thickness, as well as humidity will affect the
total cure time of the material. At room tem-
perature, an
¹
" thick confined bead of 73-20
will solidify to a solid rubber in 24 hours with
a final cure within 3 days. A
¹
" bead might
add a day to the cure, though the outer
¹
"
would cure at a like rate.
An odor caused by the release of acetic acid
will be experienced during the cure period.
This unpleasant aroma will disappear with a
cure and will not be detectable after a full cure.
Surface Preparation
In preparation for bonding 73-20 RTV Adhe-
sive/Sealant, thoroughly clean all surface ar-
eas, removing any grease and loose particles.
Additionally cleanse the surface areas with a
wipe of acetone. For rubber surfaces, roughen
the rubber surface and then wipe with acetone.
All surfaces should be dry at the time of appli-
cation.
Application
Prepare the 73-20 Tube by cutting off the nozzle
at an angle providing a desired bead size. Ad-
ditionally pierce the seal inside the throat of the
tube tip.
Push the sealant ahead of the nozzle to main-
tain a uniform bead. The thickness should be
limited to
¹
" (6mm) or less. If using an air pow-
ered caulking gun, do not exceed 45 psig.
Limit your application to an area that you can
complete and yet allow any required tooling or
edge detailing. Under normal room tempera-
ture, the material will become tack free within
twenty minutes, so all tooling, removal of mask-
ing tape, etc. should be complete within five to
ten minutes.
Caution
This product will form formaldehyde vapor at
temperatures above 300° F (150° C) in the pres-
ence of air. Formaldehyde is a potential can-
cer hazard and known to promote skin and res-
piratory problems. These vapors will irritate
eyes, nose and throat. Material should be in-
stalled in well ventilated areas. Take precau-
tions to preclude contact with skin and eyes.
Read the further precautions in the Mate-
rial Safety Data Sheet and those outlined
on the material label prior to handling.
Speedline Corp.
7200 Northfield Rd.
Walton Hills, Ohio 44146
1-800-551-9759 Fax 1-440-232-9334
73-20 Caulk - 7/03 - Page 2