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HYBRANCH:Hyperbranched Polystyrene

Hyperbranched polystyrene conceptual image Hyperbranched polystyrene conceptual image

HYBRANCH is the world's first polystyrene born from the application of DIC's polystyrene synthesizing and hyperbranching techniques. It achieves high strength without impairing moldability with a molecular structure that differs from conventional polystyrene.


Achieves High Strength Without Impairing Moldability

In general, the flowability of a polymer decreases as its molecular weight increases. However, HYBRANCH maintains flowability while having a high molecular weight by assuming a unique branching structure. In other words, HYBRANCH achieves high strength without impairing moldability.

Achieves High Strength Without Impairing Moldability

Contributes to Increased Productivity and Cost Reductions

HYBRANCH has high melt tension in sheet/film production so it breaks with difficulty and holds promise for making thin wall moldings and increasing production stability. It also holds promise for improving thickness precision because of the molecular entanglement effect by the hyperbranched structure. HYBRANCH also has a high melt tension in foam extrusion, so foam breaks with difficulty, and it holds promise for making thin-walled and light-weight products by an improved foam expansion ratio and increased productivity.

MFR ratio of change in recycling

Excellent Recyclability

HYBRANCH has a low ratio of change in flowability (MFR) after extrusion or injection molding so it holds promise to improve product stability when recycled.

Major Applications

  • Shelves, clear cases in refrigerators
  • Diffusers for optical components
  • Clear components in home electronics
  • Food packaging/containers
  • Civil engineering/building material applications

Advantages Against Other Technologies

Measured item
Testing method HYBRANCH Common polystyrene
XC-540 HB XC-520 Competitor's product
Flexing energy
DIC test 57 55 45
Charpy impact strength
JIS K7111-1:06 3.1 2.7 2.6
Melt mass flow rate (MFR)
[g/10 min]
JIS K 7210  1.7 1.6 1.9
Oil resistance
DIC test 5 4 4

Properties List

Test item
Testing method Injection type Extrusion type
Good moldability
High practical strength
High flow
Good moldability
High flow
Good moldability
High practical strength Standard
540 HB
Melt mass flow rate (MFR)
[g/10 min]
JIS K7210:99
ISO 1133:97
1.7 3.3 3.4 1.5 2.8 3.0
Tensile breaking stress
JIS K7161:94
ISO 527-1:93
JIS K7162:94
ISO 527-2:93
51 52 51 56 53 53
Tensile breaking strain
2 2 2 2 2 2
Flex strength
JIS K7171:08
ISO 178:93
100 102 103 105 103 103
Flexural modulus
3,300 3,300 3,300 3,300 3,300 3,300
Charpy impact strength
JIS K7111-1:06
ISO 179:96
3.1 2.0 2.0 2.5 2.0 2.0
Rockwell hardness (M-scale)
JIS K7202-2:01
ISO 2039-2:87
68 66 66 68 67 67
Vicat softening temperature
JIS K7206:99
ISO 306:94
93 98 95 96 102 102
Food health certificate
1959 Ministry of Health, Labor and Welfare Notice #370 Yes Yes Yes Yes Yes Yes
Application examples Cases
Large light electrical components
Expanded sheets
Expanded boards
Expanded sheets
Expanded boards
  • Specific gravity: 1.04 to 1.05
  • Mold shrinkage is 0.4 to 0.8% for all.
  • The property values in this table are representative values obtained from a natural injection specimen based on the prescribed testing methods. These values do not show standard values.
  • The test specimen follows JIS K7139:1996 (ISO 3167:1993).
  • The specimen creation conditions follow JIS K7152:1999 (ISO 294-1:1996).
  • HYBRANCH is a registered trademark of DIC.
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