Sauereisen - Model No. 29 -Low Expansion Cement

Zircon base cement for:

• Assembling
• Elements
• Embedding
• Insulating
• Resistors
• Sealing

• Withstands temperatures to 1550oF (843oC).
• †Insulates electricity.
• †Tolerant to cryogenic conditions.
• †Heat conductive and thermal shock resistant.
• †Small particle size allows for good flow characteristics.
• †Resists oil, solvents and most acids (except hydrofluoric).
• †Adheres to metal, ceramics, glass and other surfaces.
• †Odorless.
• †Hardens by chemical set even in con fined areas.
• †More economical than organics.
• †Safe to use/non-toxic.

• Absorption: 10-12%
• Coefficient of thermal expansion (ASTM C372): 4.60 x 10-6/F° (8.28 x 10-6/C°)
• Color: Tan
• Compressive strenqth (ASTM C579): 3,900 psi (274 ka/cm2)
• Density (ASTM C20): 141 pcf (2.26 gm/cm3)
• Dielectric constant (ASTM D150): 5.0-7.0
• Dielectric strength (ASTM D149)
• @70°F(21°C): 25.0 to 51.0 Volts/mil (980 to 2000 Volts/mm)
• @ 750°F (399°C): 12.5 to 25.0 Volts/mil (490 to 980 Volts/mm)
• @ 1475°F(801°C): 1.3 Volts/mil (51 Volts/mm)
• Maximum service temperature: 1550oF(843°C)
• Shrinkage: 0.50%
• Tensile strength (ASTM C307): 300 psi (21.09 kg/cm2)
• Thermal Conductivity at 500°F (260°C): "9.8-5.2 BTU in/ft2-hr-°F
• (3.3- 1.76 x  10-3Cal-cm/cm2-sec-°C)"
• Volume resistivity (ASTM D1829)
• @70°F(2l°C): 107-109 ohm-cm
• @ 750°F (399°C): 104-106 ohm-cm
• @1475°F(801°C): 102-103 ohm-cm

Sauereisen No. 29 is a two-part, chemical-setting cement consisting of a Powder and Liquid which are mixed together as used. No. 29 Powder should be thoroughly remixed before using. Weigh out 80% of No. 29 Powder and 20% of No. 29 Liquid. Place Liquid in a clean mixing container and gradually add 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. 29 may be mixed to a thinner consistency by regulating the amount of Liquid used; however, the use of excess Liquid 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 Liquid. Porous substrates may require dampening with No. 29 Liquid before applying the mixed cement.

Low Expansion Cement No. 29 hardens with an internal chemical-setting action in 18-24 hours at ambient temperatures. Working time of No. 29 when Powder is mixed with Liquid is approximately 30 minutes at 70°F. If it is desired to accelerate the cure, oven drying at 180°F 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.

Powder:
1-qt. and 1-gal. cans;
50-lb. pails lined with a plastic bag

Liquid:
1-qt. and 1-gal. cans;
50-lb. pails; 600-lb. drums

All equipment should be cleaned with soap and water before No. 29 cures. If removal is required after cure, consult Sauereisen for recommendations.

Sauereisen No. 29 Powder and Liquid have a shelf life of one (1) year when stored in unopened, tightly sealed containers in a dry location at 70oF. If there is a doubt as to the quality of the material, consult Sauereisen.

Consult Material Safety Data Sheets and container label Caution Statements for any hazards in handling this material.