Features
- Non-Curing — Stays
Flexible
- Inhibits Corrosion — Excellent
Solvent Resistance
What it Is
Vibra Seal® Preapplied
Thread Sealant is a tough, non-hardening sealant engineered
to be preapplied to parts. Vibra-Seal is designed to provide
an instant seal on tapered pipe threads against most fluids,
fuels and lubricants but can also be used on straight threads.
Vibra-Seal performs to the demanding requirements of the
automotive, truck and agricultural equipment manufacturers.
It provides lubricity superior to Teflon® — at
a lower cost!
Long-Lok can coat entire
parts (frequently done on smaller fasteners) or can apply
Vibra-Seal sealant to a limited band of threads, which is
typical of larger fasteners and fluid fittings.
How it Works
Available in white
or burnt orange colors, Vibra-Seal coatings are highly filled
water based liquids that are non-toxic and non-sagging. When
dried, they become a resilient, tight clinging and non-curing
sealant. Vibra-Seal coated parts also resist loosening because
of the prevailing torque created by the coating.
Typical Applications
- Rear Axle Filler Plugs
- Bearing Adjuster Nuts
- Overhead Fire Sprinklers
- Pressure Gauges & Sensors
- Cable Connectors
- Door Closure Hardware
|
- Brake Fittings
- Compressor Pipe Plugs
- Shower Heads
- Pipe Fittings of all Kinds
- Adjustment Screws
- Screws for Plastic Assembly
|
Specifications
| Resin
Coating |
acrylic |
Colors
|
white
or burnt orange
|
| On-part
life |
4
years, minimum |
| Toxicity |
none |
|
Torque Tension
The tension in the fastener
can be reasonably controlled by controlling the torque. For
any given fastener the torque tension relationship can be
stated as follows:
T = KDF
where T =
Torque, lb.-in. (N•m)
D =
Nominal bolt diameter, in. (m)
F =
Tension or clamping force, lbs. (N)
K is
a universal constant for all sizes which can be established
empirically.
(You can find safe stresses
for bolts in manufacturers’ fasteners specifications
or tool engineers’ handbooks).
K Values for Vibra-Seal® Sealants*
| Material |
K Value |
Dry
zinc phospate
|
0.13
|
| Zinc
phosphate/oil |
0.11 |
| Vibra-Seal
on Dry zinc phospate |
0.11 |
| Vibra-Seal
on Zinc phosphate/oil |
0.09 |
|
*3/8”-16 Grade 5
bolts with Grade 2 as received nuts. Example: Vibra-Seal
on 3/8”-16, Grade 5, zinc phosphate bolt:T = -.11 X
375 X 5000 = 206 lb.-in.
Performance
In the following, "NPT" means
National Pipe Threads.
Pressure Resistance
PIPE THREADS
| Pipe Size |
Burst Rating |
Test Pressure |
Test Results (Test Fluid –10 wt. Motor
Oil) |
½" NPT
|
10,400
psi (72 MPa)
|
10,000
psi (69 MPa) |
Tests
discontinued with no sign of leakage |
| 2" NPT |
5,200
psi (36 MPa) |
4,000
psi (28 MPa) |
| 3" NPT |
5,000
psi (35 MPa) |
3,000
psi (21 MPa) |
|
STRAIGHT THREADS
In addition to NPT joints, Vibra-Seal products can also be
used to seal straight threads. Test performed on 3/8-16
straight threads, torqued up snug, exhibited excellent
sealing characteristics at oil pressures up to 600 PSIG
(4.14 MPa).
Steam
Pressure Resistance
Tests performed on 1/2” cast iron NPT assembled
with 24 lb.-in. (2.7 N•m) seating torque yielded the
following results:
| Steam Pressure |
Steam Temperature |
Test Results |
12
psi (.014 MPa)
|
200°F
(93°C)
|
Test
discontinued after 1,000 hours with no sign of
leakage |
| 30
psi (.207 MPa) |
250°F
(121°C) |
|
Solvent Resistance
Tests performed
on 1/2” cast iron NPT at 100 PSIG (.69 MPa) hydrostatic
pressure after 30 days immersion in solvents indicated.
| Solvent |
Solvent Temperature |
Test Results |
10
Weight Motor Oil
|
300°F
(149°C)
|
No
Leakage |
| Water |
200°F
(93°C) |
| Gasoline |
77°F
(25°C) |
| Air
@ 98% Relative Humidity |
100°F
(38°C) |
| 50%
Glycol and Water |
188°F
(87°C) |
|
Break-loose and Prevailing
Torque
Vibra-Seal coated
parts will resist loosening because of the prevailing torque
characteristics shown below:
Specimens:
- Bolts — Grade
5, 3/8”-16 x 1-1/2” zinc phosphate and oil
finish
- Nuts — Grade 2,
3/8”-16 zinc phosphate and oil finish.
| Test Specimen |
Seating Torque |
Break-loose Torque |
Prevailing Torque – 180° |
Control
(No Coating)
|
360
lb-ins (40.7 N•m)
|
243
lb-ins (27.5 N•m) |
0
lb-ins (0 N•m) |
| Vibra-Seal
Coating |
360
lb-ins (40.7 N•m) |
175
lb-ins (19.8 N•m) |
21
lb-ins (2.4 N•m) |
|
Lubricity
NPT joint assembly is made
quicker and easier because of the lubricating ingredients
in Vibra-Seal products which resist thread galling. Line-up
adjustments can be made several hours after assembly without
loss of sealing quality. Joints can be easily disassembled
with regular tools even after years of service.
Reuse
Vibra-Seal products have
exhibited the ability to be reused five times on 1/2” NPT
fittings which are torqued up snugly. After five uses, these
fittings still maintain 300 psi (2.0 MPa) hydraulic pressure
without re-coating.
Staining
Vibra-Seal coatings are
slightly basic and may stain or discolor some metals, especially
those containing copper. However, the effect on performance
of the sealant and staining of the metals is inconsequential.
How to Specify
Vibra-Seal coated fasteners
and components are produced to order by Long-Lok. We can
process your supplied parts, or we can supply complete products,
including the basic fasteners or fluid fittings.
To order Vibra-Seal
coated fasteners and components, or to request a quote,
please call us and speak directly with one of our Sales
Engineers.
See for Yourself
Send us a sample of
your part or fastener, along with a brief description of
its application and performance requirements, and we’ll
process it using the most appropriate Long-Lok thread locking
or sealing method. Or, to sample a standard Long-Lok fastener,
simply supply us with a part number. Samples are provided
free of charge. Call your
nearest Long-Lok facility for assistance.
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