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Urea moulding compounds

Urea moulding compounds ( thermosetting plastics) are amino moulding 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 moulding.They are produced in a precise and vibrant range of colors. They are available in powder (which gives 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

Value

Unit

Standard

Appearance

Solid – granular/powder form

 

 

Colour

 

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

Colour testing

Colorimeter (x rite 8400)

-

 

* Compression moulding.

** Injection moulding.

 

Preheating* condition

Moulding 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
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 appliance : switches , fittings , sockets , cases.
  • Machinery spares : knob , handle , spinning machine components , instrument shell , clock shells.
  • Ornaments
  • Toilet seats & other toilet articles.
  • Ash trays , buttons

 

Packing:
  • 25Kgs. nett laminated polyethylene bags.

Handling:

  • It is advisable to wear a dust musk 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 its mouldability.