SikaBiresin® RG631

Low pressure RIM system – simulation of rubber and soft PVC

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SikaBiresin® RG631 is a very fast 2-component polyurethane low pressure RIM system for manufacturing of rubber like, flexible parts and sealings.
The Product must be processed with an adequate equipment.  

  • Simulation of rubber and soft PVC
  • Good flow behavior
  • Short demolding time
  • Very flexible
 

Overview

PRODUCT BENEFITS

  • Simulation of rubber and soft PVC
  • Good flow behavior
  • Short demolding time
  • Very flexible
 

Areas of Application

SikaBiresin® RG631 is designed for manufacturing of rubber like, flexible parts. The Product is also well suited for manufacturing of sealings, bellows and other rubber like moldings. Its good flow behavior is well suited for the production of thin-walled parts with complex shapes, such as ventilation ducts or grid-shaped radiator panels, and parts with integrated reinforcement elements. This product is suitable for experienced professional users only.  

Packaging

   

SikaBiresin® RG631 (A)

Pail

21 kg

SikaBiresin® RG631 (B)

Canister

21 kg

 

Product Details

Properties

SikaBiresin® RG631 (A)

SikaBiresin® RG631 (B)

Chemical base

Polyol

MDI-based isocyanate

Color

 

mixed

Black

Amber

Black

Density

 

cured

1.03 kg/l

1.12 kg/l

1.07 kg/l

Mixing ratio

by weight

by volume

100 : 100

100 : 92

Viscosity (CQP029-4)

 

mixed

1200 mPa·s

2300 mPa·s

1600 mPa·s

Pot life (CQP021-4)

100 g at 23 °C

60 seconds

Demolding time

at 30 °C

20 minutes

Maximum casting thickness

10 mm

Shore A hardness (CQP023-1 / ISO 868)

73 A, B

Tensile strength (CQP036-2 / ISO 527)

7 MPa A, B

Tensile elongation (CQP036-2 / ISO 527)

300 % A, B

Tear strength (CQP045-1 / ISO 34)

30 kN/m A, B

Service temperature

-40 – 70 °C

Shelf life

12 months

CQP = Corporate Quality Procedure

A) 60 °C mold temperatureB) post curing: 4 hours at 80 °C

Application

Surface preparation

Surfaces must be clean, dry, and free from grease, oil and dust.
It is recommended to use wax-based release agents. For further information regarding Sika release agent consult the corresponding Product Data Sheet.

Application

The material and processing temperature shall be between 18 °C and 25 °C.
The mold temperature shall be between 40 °C and 60 °C. Increased mold temperature results in a shorter demolding time.

 

SikaBiresin® RG631 is processed using 2-component low-pressure equipment. These equipment must be specifically set up for processing the parts to be manufactured.
The mixing process is performed by dynamic or static-dynamic mixing units.
The mold temperature has a significant influence on the mechanical and thermal properties of the final part. In case of lower mold temperature those properties may be improved by a post curing process.
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.