What is viscosity?
Viscosity is a measure of the internal friction of molecules (macromolecules) of material. To put it simply, it is a resistance to flow. That is, the higher the viscosity, the worse the material flows and flows into the winding and vice versa. An important fact is that with viscosity decreases with rising temperature. The most commonly used measure is mPa.s.
What is a flow time?
Flow time is an indirect but also the simplest method of measuring viscosity. It is defined as the amount of time that the entire amount of liquid flows through the nozzle through a standard prescribed flow cup at a given temperature. Although flow time does not give an exact viscosity value in mPa.s, based on this value, the viscosity can be estimated approximately, or recalculated.
What is an ecological impregnant?
Ecological impregnants are those that reach a low volatile organic compound (VOC) content during curing. In practice, this means that they save the environment and also the health of workers. Ecological impregnants include water-soluble and acrylate impregnants.
Is the cured impregnant harmful?
Not. All our impregnants are harmless after proper curing.
What is the function of impregnant in winding?
- To increase mechanical bonding of the winding wire
- To improveelectric propertiesof winding/product
- To improvethermal conductivity
- To protectwindingagainst moistureand chemically corrosive environment
How to clean impregnating device?
Impregnating device must be cleanedfrom anyparts of thegelimpregnant, as thesereducethe stability of theimpregnant.A suitable agent for cleaning impregnating device is the T5 thinner, which is to be found in our offer.
What should pipes for pumping resin be made from?
It is recommended that stainless steel or black iron is employed for the transfer of resin from location to location. Do not use copper, brass or PVC for the transfer of unsaturated polyester and esterimide resins.
Why impregnant does not cure in the furnancefor the prescribed time period?
Impregnant curesfor the prescribedtimeat prescribedtemperature.If you have prescribedtemperaturein the furnace, it does not meanthattheimpregnated units haveprescribedtemperature as well, since theirinsertioninto the furnace. First they need toaccumulate furnance temperature tocopper and iron. Thisprocess depends on thecapacity of the furnace and theweight of impregnated units andtheir composition. Temperature should bemeasured at winding of impregnated unit, which is usuallylowerthanthe temperaturein the furnace.
Possible recycling - impregnant reuse (when, which and how).If not applicable, why?
Drainedimpregnantcan be usedfurther. However, it should not be significantlythermallystressedto avoiddisintegrationof the peroxide usedin it. At a certainconcentrationof alreadydisintegrated peroxide,inhibitors are not able to capturefree radicalsand such a recycledimpregnantmight impair thestability of theimpregnantin the tank, wheregelationoccurred.
Gelled, or cured impregnant can no longer be reused - it cannot be recycled to the original (liquid) form.