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HRD 78

PRODUCT HIGHLIGHTS:

  • Non-Mercury Based Catalyst System
  • High impact rigid material
  • Odorless, clean white color
  • One to two hour demold time
  • Excellent for vacuum or pressure casting
  • Low viscosity
  • Exhibits exceptional high heat distortion temperature

PRODUCT DESCRIPTION:

HRD 78 produces a high impact, rigid 78 Shore D material that is commonly used to make computer housings, models of all kinds,
artwork, and can also be used for electronic component encapsulation. HRD 78 is an excellent hand-castable product that produces
parts with heat deflection temperatures up to 2200F(1040C).

PHYSICAL PROPERTIES

Hardness, ASTM D-2240 78±2
Specific Gravity (gm/cc), ASTM D-792 cured 1.15
Displacement (cu.in./lb) 26.4
Color/Appearance Creamy white
Tensile Strength (psi) ASTM D-638 7,000
Tensile Modulus, (psi) ASTM D-638 2.4X105
Elongation(%) ASTM D-638 12
Flexural Strength (psi) ASTM D-790 10,500
Flexural Modulus ASTM D-790 2.7X105
Linear Shrinkage (in./in.) (12″X1/2″X1/2″ ) 0.004
Izod Impact (ft.lbs./in.) ASTM D-256 0.7
Heat Deflection Temperature ASTM D-648@66 psi

@264 psi

 220o± 50F(104o± 30C)

200o± 50F(93o± 30C)

HANDLING PROPERTIES

Mixed Viscosity @ 770F(250C) (cps) 250
Work Time @ 770F(250C), 100 gr.mass 4.5-5 minutes
Demold Time 770F(250C) 1-2 hours
Cure Schedule For maximum physical properties
the material should be post cured