UltraPruf® II |
SCS2900 Silicone Sealant |
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| Product Description |
UltraPruf® II SCS2900 sealant is a one-part, neutral cure, low modulus, matte
finish and firm bodied weatherproofing silicone sealant that offers excellent
adhesion, weatherability and elasticity. |
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| COMPOSITION AND MATERIALS |
UltraPruf® II SCS2900 series weatherproofing sealant is a one component,
neutral cure, low modulus product which is designed for use on all types of
substrates commonly used in perimeter seals, curtainwall joints and glazing
applications. Formulated from proven silicone polymers, the sealant provides
long lasting, elastomeric adhesive beads which are resistant to attack by the
elements such as rain, snow, sunlight, ozone and atmospheric pollutants.
UltraPruf® II SCS2900 series weatherproofing sealant is easy to gun and apply
at temperatures ranging from -35°F (-37°C) to 140°F (60°C) allowing the
sealant to be used in any climate as long as the substrates are clean, dry, and
frost free. After cure, UltraPruf® II SCS2900 series weatherproofing sealant
has a ±50% joint movement capability in properly designed and installed joints.
UltraPruf® II SCS2900 series weatherproofing sealant cures on exposure to
moisture in the air. The temperature performance after cure is from -55°F (-48°
C) to +200°F (93°C). |
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| PACKAGING |
UltraPruf® II SCS2900 series weatherproofing sealant is available in 10.1 fl. oz.
(.299 ml) plastic cartridges packaged in cartons of 24 cartridges, 2 gallon pails,
and 20.0 fl. oz. “sausages”. The units are designed for convenience in shipping
and are easily handled by warehouse workers and mechanics on scaffolds and
staging. |
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| COLORS |
| UltraPruf® II SCS2900 series weatherproofing sealant is available in the
following six colors: |
| SCS2902 |
SCS2902 White |
| SCS2903 |
SCS2903 Black |
| SCS2904 |
SCS2904 Limestone |
| SCS2909 |
SCS2909 Aluminum Gray |
| SCS2920 |
SCS2920 Precast White |
| SCS2997 |
SCS2997 Bronze |
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| Key Performance Properties |
BASIC USESUltraPruf® II SCS2900 series weatherproofing sealant is intended for use for
perimeter seals around windows, curtain wall joints and other weatherseal
applications between metals, masonry, concrete, glass, paints and plastic
substrates (see Table 2).
UltraPruf® II SCS2900 series weatherproofing sealant adheres to most
common building substrates usually without priming. The low modulus property
allows use in joints subject to ±50% movement. This characteristic is
maintained over a wide temperature range after full cure. |
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LIMITATIONS |
UltraPruf® II SCS2900 series sealant is not recommended for: horizontal joints
exposed to foot or vehicular traffic or in horizontal joints where prolonged water
immersion occurs.
UltraPruf® II SCS2900 series weatherproofing sealant should not be
applied on:
 Concrete surfaces which contain residual form oil or other bond
breaking contaminants that may interfere with sealant adhesion.
Building materials which might bleed oil or solvents these include, but
are not limited to, impregnated wood and certain vulcanized rubber
gaskets or foams, tapes or failed sealants and caulking compounds.
Areas where atmospheric contaminants might change the appearance
of light colored sealants. Silicone sealant is weather-resistant and
resists chalking, degradation and erosion. As a result, environmental
contaminants tend to cling to the sealant and the sealant surface may
take on the color of the contaminant. Darker colors should be used to
minimize this effect.
Reflecting, high-gloss or light-colored surfaces where aesthetics are
critical, until adequate on-site sealant, surface and ambient
atmospheric tests simulating building design are conducted to upon by
the seller and the purchaser as a result of testing for stain or
discoloration.
Totally confined spaces, as the sealant requires atmospheric moisture
for completion of cure and generation of properties.
Surfaces which will be painted, as painting over rubber is not
recommended. The paint film does not stretch with the extension of
rubber and the adhesion of the paint to the sealant is not adequate.
Surfaces with special or protective coatings, such as mirrors, or to
surfaces such as Teflon®, polypropylene or polyethylene without the
approval of the manufacturer of the article, plastic or material.
Unprepared or wet surfaces. Do not use water for tooling and do not
apply to wet or damp surfaces.
Surfaces where adhesion has not been verified by on-site testing under
actual use conditions.
Structural glazing applications as the adhesive bead.
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| Typical Product Data |
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Table 1: UltraPruf® II SCS2900
WEATHERPROOFING SEALANT TYPICAL PROPERTIES1
(After 21 Days at 23°C and 50% Relative Humidity) |
| Property |
Value |
Value Test Method 3 |
| Tooling Time |
Time 30 Minutes |
@ 75°F/50% RH |
| Sag/Slump |
0.1 in. max. |
ASTM C639 |
| Tack-Free Time |
3 hours |
ASTM C619 |
| Cure Time |
7 days |
to 3/8” depth |
| Dynamic Movement Capability |
±50% |
ASTM C-719 |
| Hardness (Shore A) |
25 |
ASTM D2240 |
| Tensile Strength |
360 |
ASTM D412 |
| Ultraviolet & Ozone Resistance |
Excellent |
Weatherometer - Twin Arc |
| Staining on Concrete |
None |
None ASTM D1248 |
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1 Contact GE Silicones Quality Assurance for certification details of Federal
Specifications. |
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| Typical Product Data |
UltraPruf® II SCS2900 series weatherproofing sealant is basically unaffected
by normal weathering conditions such as sunlight, ultraviolet radiation, rain,
snow and temperature extremes. Its weatherability enables it to retain its
properties after years of exposure. The sealant has resistance to detrimental
effects caused by polluted atmospheres and many chemicals and chemical
solutions. See Table 1 for Typical Properties and Table 2 for Adhesion
Characteristics. Joints formed with this sealant can be expected to extend and compress 100% of the installation width with no more than 50% in a single
direction without affecting the seal or adhesive. UltraPruf® II SCS2900 series
silicone sealant is compatible with laminated glass, insulating glass units and
acrylic and Lexan® polycarbonate glazing sheet. |
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Table 2:
UltraPruf® II SCS2900 WEATHERPROOFING SEALANT
TYPICAL PROPERTIES4 |
| ASTM C-794 Peel Adhesion 14 days 73°F/50% RH and 7 days water immersion |
lbs. f/in. Cohesion % (k N/m) |
| Stainless Steel (primed*) |
30 lbs. f/in |
| Mill Finish Aluminum (primed*) |
30 lbs. f/in |
| Anodized Aluminum |
30 lbs. f/in 100% Cohesion |
| Carbon Steel |
30 lbs. f/in
100% Cohesion |
| Concrete (primed*) |
30 lbs. f/in
100% Cohesion |
| Glass |
30 lbs. f/in
100% Cohesion |
| Acrylic Sheet |
Acrylic Sheet 30 lbs. f/in
100% Cohesion |
| Lexan® Polycarbonate Sheet |
30 lbs. f/in
100% Cohesion |
| PVC Sheet (primed*) |
30 lbs. f/in
100% Cohesion |
| Polyester Fiberglass Sheet |
30 lbs. f/in
100% Cohesion |
| †Kynar 500® Resin Based Paints ( primed * ) |
30 lbs. f/in
100% Cohesion |
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| 4 Values are not intended for use as specifications |
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Specifications |
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| APPLICABLE STANDARDS |
Contact GE Silicone Quality Assurance for details on certification to:
Fed. Spec.TT-S-00230C
Fed. Spec.TT-S-001543A
ASTM C920, Type-S, NS, Class 25 |
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| FILING SYSTEMS |
Electronic SPEC-DATA®
SPEC-DATA® II
Sweet’s Architectural File 07920/GEN
GE Silicone Technical Centers |
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Instructions for Use |
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| PRIMING |
UltraPruf® II SCS2900 series weatherproofing sealant adheres without primer
to many common construction materials however, some materials such as
concrete, mill finish aluminum, galvanized steel, fluoropolymer paint coatings
(Kynar) and other materials with variable surface characteristics often require
priming. In view of unpredictable surface characteristics, trial applications
should be made to check adhesion to the specific materials to be used on the
project. SS4179 primer is recommended for concrete, some paints and plastic
surfaces. |
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| Instructions for Use |
Curtainwall expansion joints should be designed to allow installation and retention of the bond-breaking backup material during the installation and subsequent curing of UltraPruf® II SCS2900 series weatherproofing sealant. The dimensions of curtainwall expansion joints and similar applications change daily as a result of solar heat gain, wind forces and seasonal changes. The movement in a sealant bead installed on the sunny side of a building or during the hottest portion of the day in metal, glass and plastic applications will be almost entirely in extension during the cold season or cycle, while the movement of a bead installed during the coldest condition will be almost entirely in compression during the hottest season. If UltraPruf® II SCS2900 series weatherproofing sealant cannot be installed when the design width is approximately halfway between the dimensional extremes, the designed joint width must be at least twice the total anticipated joint movement. For example, if the total anticipated movement in an expansion joint in which UltraPruf® II SCS2900 series weatherproofing sealant is to be installed is 1/4” (6.4mm), the designed joint width must be 1/2” (12.8mm). Lap shear joints should have a bead width which is equal to or greater than the total anticipated movement. Small curtainwall panels and lights should allow a minimum width of 1/8” (3.2mm) for the sealant bead. Larger panels and lights (or those in which a great deal of movement is expected) should allow a minimum width of 3/16” to 1/4” (4.8 to 6.4mm) for the sealant bead. Glazing of plastic lights and sealing of wall panels fabricated from plastics require larger than usual joint dimensions due to the greater movement potential caused by plastic’s higher coefficients of thermal expansion. Consult with the nearest GE Silicones Technical Center for recommendations on large or unusual applications. |
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| JOINT FILLER MATERIALS |
The depth of the UltraPruf® II SCS2900 series weatherproofing sealant bead is
regulated by the depth of the backer rod. The rod stock should be 25%-50%
greater than the width of the joint, thereby extending continuous pressure
against the joint walls and expanding the contracting with the bead movement
without pushing the sealant out of the joint during the compression cycle.
RUBBER BACK-UP MATERIALS OFTEN STAIN SEALANTS AND ARE NOT
RECOMMENDED, UNLESS TESTED FOR COMPATIBILITY. |
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| PREPARATORY WORK |
CLEAN ALL CONCRETE, MASONRY AND STONE JOINTS OF ALL
CONTAMINANTS AND IMPURITIES. CONCRETE FORM RELEASE
AGENTS, WATER REPELLENTS, CONCRETE LAITANCE, ALL OLD
SEALANTS AND OTHER SURFACE TREATMENTS AND PROTECTIVE
COATINGS ARE EXAMPLES OF MATERIALS WHICH MUST BE REMOVED
FROM THE JOINT SURFACES TO OBTAIN PROPER SEALANT ADHESION.
POROUS SUBSTRATES SHOULD BE CLEANED WHERE NECESSARY BY
GRINDING, SAW CUTTING, BLAST CLEANING (SAND OR WATER),
MECHANICAL ABRADING OR COMBINATION OF THESE METHODS TO
PROVIDE A SOUND, CLEAN SURFACE FOR SEALANT APPLICATION.
DUST, LOOSE PARTICLES, ETC., SHOULD BE BLOWN OUT OF JOINTS
WITH OIL-FREE COMPRESSED AIR OR VACUUM CLEANED.
Clean all metal, glass and plastic surfaces by mechanical or solvent
procedures. Detergent or soap and water treatments are not recommended.
Protective films must be removed by a solvent recommended by the
manufacturer of the substrate or other means which leave no residue. In all
cases where used, solvents should be wiped dry with a clean cloth or lintless
paper towels. Cleaning solvents should not be allowed to air dry or evaporate
without wiping. Architectural coatings, paints and plastics should be cleaned
with a solvent approved by the manufacturer of the product.
Cleaning of all surfaces should be done on the same day in which the sealant
is applied. CAUTION: SOLVENTS MAY BE FLAMMABLE AND/OR TOXIC. |
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| MASKING |
The use of masking tape is recommended where appropriate to ensure a neat
job and to protect adjoining surfaces. Do not allow masking tape to touch clean
surfaces to which the silicone sealant is to adhere. Masking tape should be
removed immediately after the finish tooling of the sealant is accomplished and
before the sealant begins to cure. |
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| METHOD OF APPLICATION |
Install back-up material or joint filler, setting blocks, spacer shims and tapes as
specified. Apply silicone sealant in a continuous operation, horizontally in one
direction and vertically from the bottom to the top of the joint opening. A
positive pressure adequate to properly fill and seal the joint width should be
employed. Tool or strike the silicone sealant with light pressure to spread the
material against the back-up material and the joint surfaces. The light-weight
consistency of silicone sealant responds easily to light tooling pressure and
facilitates void-free placement. A tool with a concave profile is recommended
to keep the silicone sealant within the joint.
In glazing, tool the sealant at the sill so that precipitation and cleaning solutions
will not pool. Silicone sealant can be applied at outdoor temperatures as low as
-35°F (-37°C) provided that surfaces are clean, dry and frost free.
Excess sealant should be cleaned from glass, metal and plastic surfaces while
still uncured using a solvent. On porous surfaces the excess sealant should be
allowed to progress through the initial cure or set up. It should then be
removed by abrasion or other mechanical means. |
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ESTIMATING REQUIREMENT
TABLE 3
Linear Feet per Gallon of UltraPruf® II SCS2900
Series Weatherproofing Sealant for Various Joint Sizes |
| Widths, Inches Depth |
1/8 |
1/4 |
3/8 |
1/2 |
5/8 |
3/4 |
1 |
| 1/8 |
1223 |
616 |
411 |
307 |
246 |
205 |
154 |
| 3/16 |
-- |
411 |
275 |
205 |
164 |
137 |
103 |
| 1/4 |
-- |
307 |
205 |
154 |
123 |
103 |
77 |
| 3/8 |
-- |
-- |
137 |
103 |
82 |
68 |
51 |
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| Handling and Safety |
Material Safety Data Sheets are available upon request from GE Silicones.
Similar information for solvents and other chemicals used with GE products
may be obtained from the supplier. |
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| Availability |
SCS2903 Insulating Glass Sealant is available on a direct basis from GE
Silicones. Contact the nearest GE Technical Service Center for availability and
cost. |
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| Government Requirement |
Requirement
Prior to considering use of a GE Silicones product in fulfilling any government
requirement, please contact the Government and Trade Compliance office at
413-448-4624. |
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| LEGAL DISCLAIMER |
THE MATERIALS, PRODUCTS AND SERVICES OF GE SILICONES, GE BAYER SILICONES, GE
TOSHIBA SILICONES, THEIR SUBSIDIARIES OR AFFILIATES (THE “SUPPLIER”), ARE SOLD
SUBJECT TO THE SUPPLIER’S STANDARD CONDITIONS OF SALE, WHICH ARE INCLUDED IN
APPLICABLE SALES AGREEMENTS, PRINTED ON THE BACK OF ACKNOWLEDGMENTS AND
INVOICES, OR AVAILABLE UPON REQUEST. ALTHOUGH THE INFORMATION,
RECOMMENDATIONS OR ADVICE CONTAINED HEREIN IS GIVEN IN GOOD FAITH, SUPPLIER
MAKES NO WARRANTY OR GUARANTEE, EXPRESS OR IMPLIED,
(I) THAT THE RESULTS
DESCRIBED HEREIN WILL BE OBTAINED UNDER END-USE CONDITIONS, OR
(II) AS TO THE
EFFECTIVENESS OR SAFETY OF ANY DESIGN INCORPORATING SUPPLIER’S MATERIALS,
PRODUCTS, SERVICES, RECOMMENDATIONS OR ADVICE. NOTHING IN THIS OR ANY OTHER
DOCUMENT SHALL ALTER, VARY, SUPERSEDE OR OPERATE AS A WAIVER OF ANY OF THE
SUPPLIER’S STANDARD CONDITIONS OF SALE.
Each user bears the full responsibility for making its own determination as to the suitability of
Supplier’s materials, products, services, recommendations or advice for its own particular purpose.
Each user must identify and perform tests and analyses sufficient to assure it that its finished parts
will be safe and suitable for use under end-use conditions. Because actual use of products by the
user is beyond the control of Supplier, such use is within the exclusive responsibility of the user, and
Supplier cannot be held responsible for any loss incurred through incorrect or faulty use of the
products. Further, no statement contained herein concerning a possible or suggested use of any
material, product, service or design is intended or should be construed to grant any license under any
patent or other intellectual property right of Supplier or any of its subsidiaries or affiliated companies,
or as a recommendation for the use of such material, product, service or design in the infringement of
any patent or other intellectual property right. |
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