POLYSTYRENE IMPACT MODIFIED (HIPS)
DOW STRYON HIGH IMPACT POLYSTYRENE PS DOW 478 W-27-NT (HIPS)
Dow Styron High Impact Polystyrene PS Dow 478 W-27-NT 
Styron 478 is a high impact polystyrene with high flow, good gloss, excellent stiffness, high heat and impact resistance. It is used in applications such as toys, appliances, house wares, medical and consumer electronics.
 
APPLICATIONS
Burn-out plugs
 
Agency Ratings
          USP XXIII, Class VI
          FDA 21 CFR 177.1640
          UL 94
 
Properties
Physical Nominal Values (English) Test Method
Density - Specific Gavity 1.04  sp gr 23/23C ASTM D792
Melt Flow Rate (200C/5.0kg - G) 6.00 g/10 min ASTM D1238
Mold Shrink, Linear-Flow 0.0030 to 0.0070 in/in ASTM D955
 
Mechanical Nominal Values (English) Test Method
Tensile Modulus (2 in/min) 306,000psi ASTM D638
Tensile Strength @ Yield (2 in/min) 3,300psi ASTM D638
Tensile Strength @ Break (2 in/min) 3,300psi ASTM D638
Tensile Elongation @ Break (2 in/min) 45% ASTM D638
Flexural Modulus (0.05 in/min) 327,000psi ASTM D790
Flexural Strength (0.05 in/min) 7,000psi ASTM D790
 
Impact Nominal Values (English) Test Method
Notched Izod Impact ASTM D256
          (0F, 0.125 in, 10 mil notch) 1.00 ft-lb/in
          (73F, 0.125 in, 10 mil notch) 2.30 ft-lb/in
Gardner Impact @ (73F) 100 in-lb ASTM D3029
 
Hardness Nominal Values (English) Test Method
Rockwell Hardness ASTM D785
          (R-Scale) 105
          (L-Scale) 70
 
Thermal Nominal Values (English) Test Method
DTUL @ 264psi - Unannealed (0.125 in) 172F ASTM D648
DTUL @ 66psi - Unannealed (0.125 in) 188F ASTM D648
Vicat Softening Point 217F ASTM D1525
CLTE, Flow (-40F to 180F (-40C to 82C)) 5.0E-005 in/in/F ASTM D696
 
Ignition Characteristics Nominal Values (English) Test Method
Flame Rating - UL (0.0580 in) HB UL 94