3. Previously painted steel
shall be prepared using either hand tool cleaning, SSPC-SP2 or brush
off-blast SSPC-SP7.
4. New steel shall be prepared using any sharp clean abrasive that will
achieve a surface profile of 2 to 3 mils. Surface shall be abrasive
blasted to a near-white or SSPC-SP10 degree of cleanliness. Within four
hours of blasting, surface should be primed with a high grade industrial
primer such as *Sermetel TDC. Whenever practical, steel should be primed
in the shop and painted in the field. Primer must cure a minimum of 24
hours before silicone top coat can be applied. No maximum over-coat window
exists as long as the surface remains free from contamination.
*Sermetel TDC is available for purchase through Silchem.
Concrete
1. Degrease surface as needed conforming to SSPC-SP1. Organic solvents,
alkaline solutions, steam, hot water with detergents or other systems that
completely remove dirt, oil, grease, etc. may be used.
2. New concrete should be cured a minimum of 28 days. Surface shall be
brush-blasted, SSPC-SP7 or wire brushed, SSPC-SP2 to remove dirt and
laitance and achieve a medium profile. All surface imperfections such as
"bug holes" will be filled.
3. Weathered concrete need only be free of contamination such as dust,
dirt and laitance before coating. All damaged areas such as cracks and
spalled concrete shall be repaired prior to coating.
4. Rough and porous concrete shall be coated with a two-coat system. The
first coat should be rolled.
Wood
All wood surfaces will be coated with a two coat system. The first coat
shall be back rolled. Wood previously treated with kresolt, tar or wood
preservative may bleed through. To avoid this, allow the first coat to
cure completely before applying the second coat. |
| Property |
Results |
| Type |
One-Part, RTV Silicone |
| Cure Method |
Oxime, Moisture |
| Specific Gravity |
0.98 |
| Viscosity |
2400 cps |
| Application Temp |
(0 - 120°) F |
| Service Temp |
(-50 to 300°) F |
| Skin Over Time |
10 min. |
| Tack Free Time |
60 min. |
| % Solids (volume) |
70 |
| Durometer (Shore A) |
32 |
| Tensile Strength |
250
(psi) |
| Elongation at Break |
160
(%) |
Galvanized Steel
Areas with rust will be spot blasted and reframed. While it is normally
not necessary to pretreat galvanized steel before coating, chemical and
acid pretreaters may be used. All surfaces must be free of grease, oil,
dust and other contamination before coating.
Fiberglass
Reinforced Plastic
1. All surfaces will be cleaned in accordance with SSPC-SP1 solvent
cleaning.
Application
Siltech 2000P is a single-component material which is ready for
application by airless spray as provided. Conventional spray may require
further reduction. Up to 20% VM&P naphtha may be added.
Do not coat when relative humidity is greater than 85% or when dew point
is less than 5 degrees above surface temperature. Siltech coatings are
moisture-activated and need specially modified equipment to avoid curing
in the lines. Consult your Silchem representative for assistance. Siltech
2000GP is not intended for immersion service or where a twisting tearing
abrasion exists.
Dry Film
Requirements
| Steel |
5-9 mils |
| Concrete |
15-20 mils |
| Wood |
15-20 mils |
| Galvanized Steel |
5-9 mils |
| FRP |
5-9 mils |
|
