SikaBiresin® RG876

Low pressure RIM system – simulation of PE / PP and ABS

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SikaBiresin® RG876 is a very fast 2-component polyurethane low pressure RIM system for manufacturing of housings, coverings and car tuning parts. The product must be processed with an adequate equipment.  

  • Simulation of PE / PP and ABS
  • High flexural strength
  • Good temperature resistance
  • Good impact resistance
 
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Overview

PRODUCT BENEFITS

  • Simulation of PE / PP and ABS

  • High flexural strength

  • Good temperature resistance

  • Good impact resistance

 

Areas of Application

SikaBiresin® RG876 is designed for manufacturing of housings, coverings and claddings for machines and electronic devices. Its good mechanical properties make it particularly suitable for components in vehicle construction and car tuning, such as spoilers, front and side skirts, and engine coverings. 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® RG876 (A)

Pail

18 kg

Drum200 kg

SikaBiresin® RG900 (B)

Canister

18 kg

Drum200 kg
 

Product Details

Properties

Component A

SikaBiresin® RG876

Component B

SikaBiresin® RG900

Chemical base

Polyol

MDI‐based isocyanate

Color

 

mixed

Black

Dark amber

Black

Density

 

cured

1.05 kg/l

1.22 kg/l

1.12 kg/l

Mixing ratio

by weight

by volume

100 : 100

100 : 86

Viscosity (CQP029-4)

2000 mPa·s

1500 mPa·s

Pot life (CQP021-4)

100 g at 23 °C

65 seconds

Demolding time

15 minutes

Maximum casting thickness

10 mm

Shore D hardness (CQP023-1 / ISO 868)

80 A

Tensile strength (CQP036-2 / ISO 527)

50 MPa A

Flexural modulus (CQP027-2 / ISO 178)

2000 MPa A

Impact resistance (CQP038-2 / ISO 179)

40 kJ/m2 A

Coefficient of thermal expansion (CQP053-1 / ISO 11359)

0 – 100 °C

120 x 10-6 1/K A

Glass transition temperature (CQP053-1 / ISO 11359)

100 °C A

Service temperature

-20 – 90 °C

Shelf life

12 months

CQP = Corporate Quality Procedure

A) post curing: 80 °C for 4 hours

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 20 °C and 40 °C. Increased mold temperature results in a shorter demolding time.

 

SikaBiresin® RG876 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.

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