Sauereisen - Model No. 33S - Sealing Cement
From Corrosion Protection - Air-Setting Adhesives Products
Sauereisen Sealing Cement No. 33S is a chemical-setting, inorganic, silicate-base cement that is used for assembly/sealing applications common to electrical equipment. It is ideal for coating molds and forms used to produce special shapes and patterns. No. 33S is supplied in powder form and need only be mixed with water to apply.
Characteristics
- Insulates electricity.
- Withstands temperatures to 1600oF (827oC).
- Heat conductive and thermal shock resistant.
- Resists oil, solvents and most acids (except hydrofluoric).
- Safe to use/non-toxic.
- Adheres to metal, ceramics, glass and other surfaces.
- Odorless.
- Hardens by chemical set even in con fined areas.
- More economical than organics.
Applications:
Sauereisen No. 33S Powder should be thoroughly remixed before using. Weigh out 75-80% of No. 33S Powder and 20- 25% potable water. Place measured amount of water into a clean mixing container and gradually add the No. 33S Powder while mixing. Continue mixing until a smooth uniform consistency is obtained. Mixing may be done with a slow-speed mixer or by hand with a spatula.
No. 33S may be mixed to a thinner consistency by regulating the amount of water used; however, the use of excess water will reduce mechanical strength, increase shrinkage and delay set time. Failure of cement to adhere indicates setting has begun - discard cement. Do not attempt to retemper by adding more water. Porous substrates may require dampening with Sauereisen Thinning Liquid No. 14 before applying the mixed cement.
Physical Properties
- Coefficient of thermal expansion (ASTM C372): 9.48 x 10-6/Fo (17.06 x 10-5/Co)
- Color: White
- Compressive strength (ASTM C579) @ 7 days: 1,460 psi (102 kg/cm2)
- Flexural strength (ASTM C580( @ 2 days: 250 psi (17 kg/cm2)
- Maximum service temperature: 1600oF (827oC)
- Modulus of rupture (ASTM C580) @ 7 days: 431 psi (30 kg/cm2)
Setting/Curing
No. 33S hardens with an internal chemical-setting action in 18-24 hours at ambient temperatures. Working time of No. 33S when Powder is mixed with water is approximately 30 minutes at 700F. If it is desired to accelerate the cure, oven drying at 1800F can be used. Avoid steaming while drying. If the cement will be exposed to elevated temperatures, contact Sauereisen for appropriate drying schedule recommendations.
If high humidity resistance is required and it is impractical to fire cement, a moisture-resistant lacquer or silicone coating should be applied to the exposed surfaces.
Packaging
- 1-qt. and 1-gal. cans;
- 50-lb. pails lined with a plastic bag
Clean-Up
All equipment should be cleaned with soap and water before No. 33S cures. If removal is required after cure, consult Sauereisen for recommendations.
Shelf Life
Sauereisen No. 33S Powder has a shelf life of one year when stored in unopened, tightly sealed containers in a dry location at 700F. If there is a doubt as to the quality of the material, consult Sauereisen.
Caution
Consult Material Safety Data Sheets and container label Caution Statements for any hazards in handling this material.
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