Share this page by mail SiO2 embedding cement
Durapot® 821 is a Cotronics® ceramics are high temperature, high resistance encapsulating and embedding cements that can be used for applications up to 1850°C.
Durapot® 821 is a Quartz based, fast curing adhesive and potting compound. The perfect material for bonding and potting Quartz Lamps, Glassware, Fibre Cables or any low expansion material. It is easy to use and allows fast cures when required. Ideal for use in production applications.
Technical data of SIO2 embedding cement
|
Composition |
Units |
Durapot® 821 |
|
Base |
Quartz |
|
|
Grain size (min-max) |
µm |
≤45 - 150 |
|
Max Temperature |
°C |
1370 |
|
Resistivity |
Ohm.cm |
108 |
|
Dielectric Strength |
kV/mm |
4.9 |
|
Thermal Expansion |
10-6/K |
0.5 |
|
Thermal Conductivity |
W/m.K |
0.72 |
|
Pot Life |
min |
20 |
|
Components |
2 |
|
|
Mix Ratio base/activator |
100/44 |
|
|
Cure Cycle Time |
Hrs @ Room Temp. |
24 |
|
Cure Cycle Time |
°C |
5-15min @ 95°C |
FAQs that can help you in this category
Yes, Final Advanced Materials produces epoxy resins loaded with silver, nickel or graphite with electrical conductivity (typical resistivity 10⁻⁴ to 10⁻³ Ω·cm) sufficient to enable a weld to be replaced. However, their temperature resistance is limited to 150–250°C under continuous temperature, or 300°C for short-term with thermal curing. Above this temperature the organic matrix degrades (under the effect of oxidisation and pyrolysis). NB: Final Advanced Materials' metal-loaded ceramic cements (nickel, aluminium or stainless steel) are not suitable for applications requiring electrical conductivity and high-temperature resistance (>350°C) because their electrical conductivity is far too low.
A castable ceramic cement has low viscosity, enabling casting or pouring in moulds of complex shapes. It is formulated to limit segregation, to ensure effective dimensional reproducibility, and to produce a ceramic part. Potting cement is used to encapsulate or fix components in an assembly.
At Final Advanced Materials castable cements are optimised for the manufacture of parts (final density 2.0–3.0 g/cm³), while potting cements are designed to prioritise adhesion in assemblies (housings, resistor overmoulding, etc.).
For foundry moulds Final Advanced Materials produces alumina, silicon carbide, silica or zirconia-based cements, which are suited for temperatures between 1,200 and 2,200°C. Zirconia formulations are particularly suitable if a very high resistance to chemicals is required. Alumina cements have better mechanical resistance (>40 MPa in compression). SiC cement is a very good option for molten metal casting, launders, crucibles or nozzles. The choice depends on the cast metal and the temperature (e.g.: aluminium ~700°C, steel >1,500°C) and the thermal shock resistance.
The ceramic casting cements produced by Final Advanced Materials have standard compression resistances of 10 to 40 MPa, depending on the formulation and porosity. Thermal shrinkage is generally low, reducing internal stresses and cracking. Dense alumina-based formulations offer the best mechanical performance, while more insulating systems have a lower resistance, but reduced thermal conductivity (<0.15 W/m·K).