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ThreeBond 3732 Heat-resistant, inorganic adhesive |
Heat-resistant inorganic adhesives, silicate-based or phosphoric-based, have been used for assemblies that will reach temperatures of over 400°C, but they are unsatisfactory in water resistance, dielectricity, airtightness, and workability. As a result, they are not widely used. ThreeBond 3732 is a brand-new heat-resistant inorganic adhesive, in which the binder is alkoxide. It is a one-part adhesive that cures at low temperature and foams very little, and therefore is very workable. After curing, it has excellent airtightness, resistance to water, and dielectricity; therefore it makes many kinds of bonding possible for the first time. It can be used for filling and for relatively thick coating. Also the properties of the binder offer a wide variety of potential uses, for instance in paints and putties. |
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Excellent workability |
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Not affected by acids or alkalis |
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Excellent water resistance |
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Excellent dielectricity |
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Excellent airtightness |
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Good resistance to the temperatures from 1 to 400°C |
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Incombustible after curing, because it is 100% inorganic |
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Filling and fixing of ceramics, glasses, and metals |
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Filling, bonding, and coating of sensors and elements |
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Sealing of sheath heaters |
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Fixing of electrical and electronic parts in areas subject to high temperature |
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Filling and fixing spark plugs during their assembly |
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Filling joints that will be subjected to high temperature |
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Adding to mold materials to increase heat resistance |
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Metal antioxidant coating |
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Bonding-proof coating for carbons and sludges |
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Bonding in areas where there is need for heat resistance, anti-organic solvent property, weather resistance, or abrasion resistance |
Properties
before curing |
Color and appearance |
White paste |
| Major component |
Alumina |
| Solvent |
Alcohol-based solvent |
| Viscosity |
10,000cP |
| Specific gravity |
2.6 |
Properties after
curing |
Heat resistance temperature (Seger cone method) |
1,400°C or over |
| Thermal expansion coefficient |
75 x ~10-7/°C |
| Heat conductance |
6.1 x ~10-3cal/cm sec °C |
| Vickers hardness (0.2kgf) |
200Hv |
| Flexural strength |
100kgf/cm2 |
| Stamping out-adhesive strength for insertion *1 |
26kgf/cm2 |
| Volume resistivity at room temperature |
1 x ~1012Ω cm |
| Volume resistivity after 5 hours of boiling |
2 x ~1011Ω cm |
| Dielectric constant |
6.0(1KHz) |
| Dielectric loss tangent |
4.1 x ~10-3(1KHz) |
| Water-repellent quality (contact angle with water) |
100° |
Chemical
resistance
*2 |
Water after 2 hours of boiling |
OK |
| 5% HCl(25°C x 24 hours)) |
OK |
| 5% NaOH (25°C x 24 hours) |
Slightly seen cracks or peeling |
| Toluene (25°C x 24 hours) |
OK |
| Methanol (25°C x 24 hours) |
OK |
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| *1 |
Strength was measured at the point where ThreeBond 3732 was applied between an iron ring with an inside diameter of 10 mm and a height of 5mm, and an aluminum spindle with a diameter of 4mm and a height of 10mm. The spindle was pulled out after the adhesive was loaded. |
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The test piece of stainless steel plate was coated with ThereeBond 3732 and thermal-cured, and then dipped into these chemicals. It was then checked for cracking, peeling, or change in color. |
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