Urea moulding compounds
Urea molding compounds ( thermosetting plastics) are amino molding compounds composed of urea formaldehyde and alpha-cellulose as filling material with the addition of lubricant, hardening agent & pigments. Thermosets offer many advantages over basic thermoplastics and are suitable for compression, transfer, or injection molding. They are produced in a precise and vibrant range of colors. They are available in powder (which gives a much better surface) or granular form. Thermosets are strong, glossy, durable, and highly resistant to scratches and staining. They are not affected by fats, oils, esters, ethers, petrol, alcohol, or acetone nor by detergents or weak acids & weak alkalis
| Parameter | |||||
|---|---|---|---|---|---|
|
Parameter |
Value |
Unit |
Standard |
Appearance |
Solid – granular/powder form |
|
|
|
Color |
Different according to customer requirements
|
|
|
|
Flow |
(150 – 220)* ( 80 – 140 )** |
mm x 10-2 |
|
|
CT |
( 22 – 26 ) * ( 28 – 34 ) ** |
sec |
|
|
Bulk density |
0.58 – 0.66 |
gm/cm3 |
ISO 60 |
|
Specific weight |
1.4 - 1.5 |
gm/cm3 |
Din 7708 |
|
Humidity (60 0C) |
2 max |
% |
|
|
Volatile matter (110 0C) |
4 max |
% |
|
|
Grain size |
According to customer requirements |
mm |
|
|
Shrinkage |
0.9 max |
% |
Din 7708 |
|
Water absorption |
≤ 150 |
mg |
ISO 14527 |
|
Mechanical Properties |
|||
|
1-Stress at break |
(≥ 45)* (≥ 55)** |
Mpa |
ISO 14527 |
|
2- Flexural strength |
(≥ 80)* ( ≥ 100)** |
Mpa |
ISO 14527 |
|
3-Charpy Impact strength |
( ≥ 5)* (≥ 7.5)** |
KJ/m2 |
ISO 14527 |
|
4- Charpy Notched Impact strength |
( ≥ 1.1)* ( ≥ 1.3)** |
KJ/m2 |
ISO 14527 |
|
Thermal Properties |
|||
|
1-Temperature of deflection under load Tf (1.8) |
≥ 130 |
0C |
ISO 14527 |
|
2- Temperature of deflection under load Tf (8.0) |
≥ 90 |
0C |
ISO 14527 |
|
3- Flammability (glow bar) , BH |
≤ BH2-10 |
- |
ISO 14527 |
|
4- Flammability (UL classification) |
V-0 |
Grade |
UL 94 |
|
Electrical Properties |
|||
|
1-Dissipation Factor |
≤ 0.1 |
- |
ISO 14527 |
|
2- Volume resistivity |
≥ 1012 |
Ω.cm |
ISO 14527 |
|
3-Surface resistivity |
≥ 1011 |
Ω |
ISO 14527 |
|
4- Proof Tracking Index |
≥ 600 |
- |
ISO 14527 |
|
Brabender Plastograph |
Plastogram |
- |
Din 53764 |
|
Color testing |
Colorimeter (x rite 8400) |
- |
|
- Compression moulding
- Injection molding
|
Preheating* condition |
Molding condition* |
||||
Temperature,0C |
Time, sec |
Temperature,0C |
Pressure Kg/cm2 |
Curing time sec/mm |
Time of production |
|
70-75 |
30-60 |
140 – 150 |
200 min |
8 - 10 |
According to shape, thickness, ……. of the product |
All of these items may be variable according to customer pressing conditions.
Packing: • 25Kgs. net laminated polyethylene bags.
Handling: It is advisable to wear a dust mask while emptying the bags. Hands should be thoroughly washed at the end of the working day and before meals.
Storage: • Storage at 250c gives stability for 6 months
• Avoid moisture, dirt, packaging damage &high temperature which affect the materials flow and mouldability
Major application areas
Their high mechanical strength, heat and fire resistance and good electrical arc and tracking resistance make them an ideal plastic for numerous industrial and household applications like :
- Spares of electrical appliances: switches, fittings, sockets, cases.
- Machinery spares: knob, handle, spinning machine components, instrument shell, clock shells.
- Ornaments
- Toilet seats & other toilet articles.
- Ashtrays , buttons
