POLYURETHANE CASTING RESIN
An UL-V0 Approved System (UL File No. E255884)
URECAST- FR is a PU based potting compound specially developed for Electrical c Electronics applications. When mixed with liquid Poly Isocyanates, undergo a chemical reaction and cure to yield thermoset. URECAST- FR has distinct advantages over Epoxy Resins.
- Flame retardancy meeting the requirements of UL 94 V0
- Very low shrinkage
- Low initial Viscosity
- Higher degree of Elasticity ,most resilient material
- Resistance to Chemicals c transformer oils
- Easy pourability
- Lower material cost than epoxy
Applications
- Cable Fittings
- URECAST-FR is ideally used in the manufacture of cable sleeves and sealing ends.
- The additional properties are
- Good adhesion to PVC
- High resistance to aggressive soil
- Electrical & Electronic Circuit Potting
- URECAST- FR is used to encapsulate electrical components such as Transformers, Capacitors and Electronic circuits
- The URECAST- FR potted electronic circuits have following advantages
- Safe from tracing your precious circuits
- Delicate electronic components are well protected from mechanical shocks, moisture, chemicals & dust.
Physical Properties Of URECAST- FR
| Properties | Unit | URECAST FR | Hardner PU |
|---|---|---|---|
| Color | -- | Natural # | Dark Brown |
| Density | g/cc | 1.100 – 1.500 | 1.00 – 1.120 |
| Viscosity by BF at 27 °C | mPa.s | 5000 ± 2000 | 300 ± 200 |
| Shelf Life | months | 6 | 6 |
Directions To Use
- URECAST- FR contains filler and pigments which tend to settle at the bottom. The user has to stir the contents thoroughly for few minutes and wait for 5 minutes to allow air bubbles to escape. It is then poured
- Mixing Ratio R/H : 100: 20 -25 p.b.w
- Pot Life at 27°C : 20-30 Minutes
- Curing Time : 24 hours at RT
Properties Of The Cast Resin
- Specimen Curing: 16 hrs at RT + 4 hrs at 80°C
| Mechanical Properties | Unit | URECAST FR + Hardner PU |
|---|---|---|
| Flexural strength | N / mm2 | Flexible |
| Elongation Break | % | 30-35 |
| Impact strength | kJ / mm2 | > 25 |
| Tensile strength | N / mm2 | 3 - 5 |
| Hardness | Shore A Shore D |
80-90 40-45 |
| Electrical Properties | ||
| Dielectric strength | kV/mm | 17-18 |
| Track resistance | Volt | > 600 |
| Dissipation Factor | Tan δ | 70 x 10-3 |
| Volume Resistivity | ohm.cm | 5.8 x 1013 |
| Dielectric Constant | 4 | |
| Thermal Class | Class F | |
Precautions
- Hardner is highly susceptible to atmospheric moisture and should be always kept in air – tight condition
- Throughly wash hands with soap and plenty of water after finishing the application
NOTE: Regularly available in Black and Red Color, other colors are on request