SikaBiresin® PX235 HT

Vacuum casting polyurethane for technical parts and prototypes

SikaBiresin® PX235 HT is a 2-component vacuum casting polyurethane system for manufacturing of technical parts and prototypes.  

  • Very high temperature resistance
  • Low viscosity
  • High flexural modulus for better dimensional stability
  • Good impact resistance
  • Easy processing
 
Show all documents

Overview

PRODUCT BENEFITS

  • Very high temperature resistance
  • Low viscosity
  • High flexural modulus for better dimensional stability
  • Good impact resistance
  • Easy processing
 

Areas of Application

SikaBiresin® PX235 HT is designed for manufacturing of prototype parts and mock-ups by vacuum casting with mechanical properties similar to thermoplastics.
The Product is suitable for silicone-mold casting applications where long-term temperature resistance is required. 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® PX235 HT (A)

Box with tins

6 x 1 kg

SikaBiresin® PX235 HT (B)

Box with bottles

6 x 0.5 kg

 

Product Details

Properties

SikaBiresin® PX235 HT (A)

SikaBiresin® PX235 HT (B)

Chemical base

Isocyanate

Polyol

Color

 

mixed

Light amber

Transparent

Light amber

Density

 

cured

1.22 kg/l

1.01 kg/l

1.19 kg/l

Mixing ratio

by weight

100 : 50

Viscosity (CQP538-2 / BROOKFIELD LVT)

 

mixed

35 mPa·s

250 mPa·s

150 mPa·s

Pot life (CQP021-3 / Gel Timer TECAM)

150 g at 23 °C

5 minutes

Demolding time

60 minutes

Maximum casting thickness

5 mm

Shore D hardness (CQP023-1 / ISO 868)

at 23 °C

at 130 °C

at 160 °C

80 A

75 A

70 A

Flexural modulus (CQP027-2 / ISO 178)

2500 MPa A

Flexural strength (CQP027-2 / ISO 178)

100 MPa A

Tensile modulus (CQP036-2 / ISO 527)

at 23 °C

1800 MPa 

Elongation at break (CQP036-2 / ISO 527)

5 % A

Impact resistance (CQP038-2 / ISO 179)

75 kJ/m2 A

Linear shrinkage (CQP014-5)

500 x 50 x 5 mm

6 mm/m

Glass transition temperature (CQP053-1 / ISO 11359)

200 °C A

Shelf life

6 months

CQP = Corporate Quality Procedure

A) curing condition: 100 °C for 1 hour + 160 °C for 12 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 60 minutes to cure.
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.

Documents