| Varglas ES-4400 Silicone Rubber |
Description
Varglas ES-4400 Silicone Rubber Sleeving is produced by curing a specially compounded silicone gum with a select catalyst on a continuous length of Fiberglas® braid. Most silicone rubber is characterized, chiefly, by its capability of performing satisfactorily at elevated temperatures. Varglas ES-4400 Silicone Rubber, in addition to providing superior dielectric and thermal protection, at less weight, was developed to meet unusual fluid and flame resistance requirements. Its high temperature performance places it in a 220°C classification.
Specifications
Varglas ES-4400
Silicone Rubber Sleeving conforms to MIL-l-3190/8 and exceeds the
requirements of MIL-l-3190/6, latest revisions (Grade A), and is on the
Qualified Products List (QPL) for both. It also exceeds the requirements
of NEMA TF-1, Type 5; and ASTM-D372.
Under the Component Program of
Underwriters Laboratories, Grade A Varglas ES-4400 Silicone Rubber is
recognized for 200°C, 600 volt service (Class 220° C recognition is
pending) and complies with VW-1 flammability requirements under UL File
#E63450. (VW-1 compliance of Grades B through C-1 is covered under UL File
#E53690.) The Canadian Standards Association certifies the use of Grade A
for 200°C, 600 volt service under CSA File #LR-58486 “OFS”. Varglas
ES-4400 is incorporated in systems work, per UL Safety Standard 1446, to
facilitate product acceptance by UL.
Applications
Varglas ES-4400
Silicone Rubber Sleeving’s superior dielectric strength, high and low
temperature performance, and excellent fluid and flame resistance make it
ideally suited for use in industrial instrumentation for measurement,
analysis and control; surgical, medical and optical instruments and
apparatus; electrical and electronic machinery and equipment; and aircraft
and other transportation equipment where its lighter weight provides an
additional performance advantage.
Sizes
AWG #24 through
1” l.D. Other sizes subject to inquiry.
Standard Color
Blue-gray and
tan. Other colors made to order.
Standard
Packaging
Coils, spools or
36” lengths at manufacturer’s option, unless otherwise specified. There is
no cutting charge for 36” lengths, but lengths other than 36” are subject
to cutting charges.
FibergIas® is a
registered trademark of Owens-Corning.
Typical Properties
Property
Procedure
Performance
Physical
Tear
Strength, Coating
ASTM-D624
180 psi
(Die B)
Ultimate
Elongation, Coating
ASTM-D882
570% @
20°C
Hardness,
Coating
ASTM-D2240
50
(Durometer, Shore A - 2)
Flexibility
and Toughness, Coating
UL 1441
Passes
(Penetration Test)
Chemical
Chemical
Resistance
Resistant
to solvents and fluids including water vapor
Fungus
Resistance
Passes
Oil
Resistance, 22 hour immersion @ 70°C
ASTM -
D471
No
measurable change in wall thickness when immersed in Skydrol LD.
Varflex tests indicate good resistance to Freon 22 and refrigeration
oil Suniso® 3-G.
Compatibility
UL 1446
Good.
Compatible with select potting compounds and varnished wires with no
deteriorating effects on end properties.
Electrical
Dielectric
Strength after 48/23/50:
Grade A
NEMA TF -
1
8000v min.
avg., 6000v min. indiv.
Grade B
NEMA TF -
1
4000v min.
avg., 2500v min. indiv.
Grade C - 1
NEMA TF -
1
2500v min.
avg., 1500v min. indiv.
Dielectric
Strength after 96/23/96:
Grade A
NEMA TF -
1
80% of
Original Value.
Hydrolytic
Stability after 336 hrs. @ 70°C over Constant Water Reflux
MIL-I-3190/8
5000 volts
min. avg.
Thermal
Thermal
Endurance
MIL-l-3190/8
Class 220°C
(R)
MIL-l-3190/6 & UL 1441
Exceeds
MIL-l-3190/6, latest revision, and UL 1441, Class 200°C
Brittleness
Temperature
ASTM-D350
-
73°C
Flame
Resistance
UL 1441
Passes
(VW-1)
ASTM-D350
Passes
NEMA
TF-1
Passes
MIL-l-3190/8, Method A
Passes
Smoke
Density (NBS Chamber)
ASTM-E662
Passes.
Avg. non-flaming 3.7 OD.;
Avg. flaming 19.7 OD.
Pushback
after 168 hrs. @ 250°C
MIL-l-3190/8
No cracks
or ruptures. 6000 volts min. avg. dielectic
strength
Note. Information contained here is precise and reliable
However, being unique. each end-use should be evaluated to satisty its
specific requirements