SikaBiresin® PX331

Vacuum casting polyurethane for technical parts and prototypes

SikaBiresin® PX331 is a 2-component vacuum casting polyurethane system for manufacturing of technical parts and prototypes.  

  • Verified self-extinguishing behavior
  • Good thermal properties
  • Fast demolding
  • Can be easily colored with CP colors
 

Overview

PRODUCT BENEFITS

  • Verified self-extinguishing behavior
  • Good thermal properties
  • Fast demolding
  • Can be easily colored with CP colors
 

Areas of Application

SikaBiresin® PX331 is designed for manufacturing of prototype parts and mock-ups by vacuum casting with mechanical properties similar to thermoplastics like filled ABS by casting in silicone molds. This product is suitable for experienced professional users only. Tests under actual processing conditions and with additional materials such as coatings and release agents must be performed to proof material compatibility.  

Packaging

     

SikaBiresin® PX331 (A)

Box with bottles

6 x 1 kg

SikaBiresin® PX331 (B)

Box with bottles

6 x 1 kg

 

Product Details

Properties

SikaBiresin® PX331 (A)

SikaBiresin® PX331 (B)

Chemical base

Isocyanate

Polyol

Color

 

mixed

Yellowish

Off-white

Off-white

Density

 

cured

1.22 kg/l

1.37 kg/l

1.35 kg/l

Mixing ratio

by weight

100 : 100

Viscosity (CQP538-2 / BROOKFIELD LVT)

 

mixed

150 mPa·s

3000 mPa·s

700 mPa·s

Pot life (CQP021-3 / Gel Timer TECAM)

200 g at 23 °C

6 minutes

Demolding time

thickness > 3 mm

thickness < 3 mm

45 minutes

75 minutes

Maximum casting thickness

5 mm

Shore D hardness (CQP023-1 / ISO 868)

86 A

Flexural modulus (CQP027-2 / ISO 178)

3700 MPa A

Flexural strength (CQP027-2 / ISO 178)

133 MPa A

Flexural strain at flexural strength (CQP027-2 / ISO 178)

4.2 % A

Tensile modulus (CQP036-2 / ISO 527)

4500 MPa A

Tensile strength (CQP036-2 / ISO 527)

55 MPa A

Elongation at break (CQP036-2 / ISO 527)

4 % A

Impact resistance (CQP038-2 / ISO 179)

26 kJ/m2 A

Heat deflection temperature (CQP030-1 / ISO 75A)

90 °C A

Glass transition temperature (CQP053-1 / ISO 11359)

100 °C A

Shelf life

6 months

CQP = Corporate Quality Procedure

A) curing condition: 70 °C for 1 hour + 80 °C for 16 hours

Application

METHOD OF APPLICATION

The material and processing temperature shall be between 18 °C and 25 °C. Temperature of a silicone mold shall be 70 °C.
The material can only be used in a vacuum casting machine.

Application

Immediately after mixing pour the Product into the preheated silicone mold. After casting, place the mold in a preheated oven (70 °C) for 45 ─ 75 minutes, depending on the wall thickness of the parts.
Further post curing of the demolded part can improve the final mechanical properties.
Depending on the geometry and weight of the part, it is recommended to use a conformer while post curing.

STORAGE CONDITIONS

Both components must be stored at temperature between 15 °C and 25 °C in original unopened containers.