Omega Products OB-400 User Manual

OMEGABOND®High Temperature

Air Set Cements

⻬ Heat Conductive ⻬ Thermal Shock Resistant ⻬ Insulate Electricity ⻬ Resists Oils, Solvents,

Most Acids

⻬ Adheres to Practically

All Clean Surfaces**

OB Series

Starts at

OMEGABOND

300

OMEGABOND

Air Set Cements set or cure through loss of moisture by evaporation. Atmospheric conditions therefore affect the drying rate. Air Set Cements are used mainly in thin film applications (applied in thicknesses less than 1⁄4")*.

400

Selection Criteria for Cements

1. Type of Application—

Potting, sealing, encapsulating, assembling, bonding. Is a thick or thin film of cement required? This dictates whether or not an air set or a chemical set cement should be used.

2. Thermal Considerations—

What is the maximum temperature that the cement must withstand? What degree of thermal conductivity is needed? What degree of thermal expansion is allowed? These parameters are then matched to the appropriate cement.

OMEGABOND®500

Powder

3. Substrate—What materials will

the cement be in contact with?

4. Application Considerations—Pot

life, set time, method of dispensing, batch size, cure procedure.

5. Miscellaneous Considerations—

Porosity, moisture absorption, electrical resistance, volume stability, clearances/tolerances.

Liquid

MOST POPULAR MODELS HIGHLIGHTED!

To Order

Model No. Price Description OB-300 $36 OMEGABOND®300 powder, 8 fluid oz

OB-400 36 OMEGABOND®400 powder, 8 fluid oz

OB-500 POWDER

OB-500 LIQUID 36 OMEGABOND®500 liquid, 8 fluid oz

OB-KIT-1 54 Air set cement kit, ideal for research purposes;

OB-TL 36 OMEGABOND®thinning liquid,

See next page for footnotes.

*, **

Ordering Example: OB-400, is a high temperature air set cement, 8 fluid oz, $36.

(Specify Model Number)

(1 part cement; just mix with water)

36 OMEGABOND®500 powder, 8 fluid oz

(2 part cement; mix powder with OB-500 liquid)

(2 part cement; mix liquid with OB-500 powder)

includes 2 fluid oz each of OB-300, OB-400, OB-500 powder and OB-500 liquid

8 fluid oz used to dampen porous substrates before application of mixed OB-300 or OB-400 cements

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High Temperature Air Set Cements

Applications

OMEGABOND®300 OMEGABOND®400 OMEGABOND®500

⻬ Assembling ⻬ Coating ⻬ Coating ⻬ Sealing ⻬ Embedding ⻬ Dipping ⻬ Insulating ⻬ Insulating ⻬ Casting

Physical Properties

†

OMEGABOND 300 OMEGABOND 400 OMEGABOND 500

Type of Cement (1 or 2 Part) 1 Part 1 Part 2 Part Coefficient of thermal expansion, in/in°F 6.2 x 10 Color Off white Tan to gray Off white Compressive strength, psi 3900 3300 1500

-6

13.0 x 10

-6

10.93 x 10

-6

††

Dielectric constant 3.5 to 6.0 3.4 to 4.5 Dielectric strength at 20°C (70°F), V/mil 12.5 to 51.0 12.5 to 51.0 Dielectric strength at 400°C (750°F), V/mil ≤15.0 ≤15.0 Dielectric strength at 795°C (1475°F), V/mil ≤1.3 ≤1.3 Maximum service temperature, °C (°F) 980 (1800) 1425 (2600) 1205 (2200) Modulus of rupture, psi 460 Shear strength, psi 710 375 Tensile strength, psi 410 325 1500 Volume resistivity at 20°C (70°F), Ω-cm 108-10 Volume resistivity at 400°C (750°F), Ω-cm 104-10 Volume resistivity at 795°C (1475°F), Ω-cm 102-10 Density (wet), lbs/ft Density (dry), lbs/ft

Flexural strength, psi 2000 Modulus of elasticity, psi 3.6 x 10

108-10 105-10 103-10

112 82

††

Pot life, hr 1.0 Thermal conductivity, btu-in/ft2-hr-°F 4-6 11

Mix ratio 1-part cement; just 1-part cement; just 2-part cement: just

mix powder with water mix powder with water mix powder and binder; to a smooth, uniform to a smooth, uniform mix ratio for cast consistency consistency applications ranges

from 1.87 to 2.0 parts powder to 1-part liquid binder by weight

Curing schedule OMEGABOND 300

OMEGABOND 400

OMEGABOND 500®has cures at room cures at room a pot life of 1-hr after temperature by air drying temperature by air drying the powder and binder in 18 to 24-hr, depending in 18 to 24-hr, depending are mixed together; upon thickness and upon thickness and OB-500 reaches an consistency; cure time consistency; cure time initial air set after 4-hr can be accelerated by can be accelerated by at room temperature; low temperature oven low temperature oven a final set is only reached drying at 82°C (180°F); if the drying at 82°C (180°F); if the after oven baking at cement is to be exposed cement is to be exposed 55°C (130°F) for 4-hr; to elevated temperatures, to elevated temperatures, if the cement is to be used cure for 18 to 24-hr at cure for 18 to 24-hr at at temperatures above ambient temperature, ambient temperature, 100°C (212°F), OB-500 then oven dry for 4-hr then oven dry for 4-hr must under go an extended at 82°C (180°F) and for at 82°C (180°F) and for cure at 105°C (220°F) or an additional 4-hr at an additional 4-hr at above for 12 hours 105°C (220°F), this helps to 105°C (220°F), this helps to prevent spilling prevent spilling

Distinguishing characteristics Lower thermal Higher thermal conductivity Withstands short-term and applications conductivity and and coefficient of thermal immersion in molten

coefficient of thermal expansion; high maximum metal; used as a expansion temperature rating coating on expendable

thermocouple tubes

†

These physical properties were determined under laboratory conditions using applicable ASTM procedures. Actual field data may vary.

Do not use physical properties data for specifications.

††

Strength at 1 day after curing at 105°C (220°F).

Chemical set cements are also available. See OMEGABOND®600, OMEGABOND®700 and CC high temperature cement. These cements set

or cure by an internal chemical action which does not require exposure to air. They can be used in thick applications (greater than 1⁄4" thickness).

Porous substrates may require dampening with thinning liquid before application of mixed cement. For OMEGABOND®300 and OMEGABOND

400 (1 part cements), order OMEGABOND®thinning liquid (8 fluid oz), OB-TL, $36. For OMEGABOND®500 (2 part cement), use OMEGABOND 500 liquid to dampen porous substrates.

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