The function of this casting material is to insulate and protect low and medium voltage systems where mechanical protection and prevention of water ingress from outside the joint or from within the cable are required (classification according HD 631.1 S2: LMP/LI-W: MMP-W).
RAPID 4300 is a two component hydrophobic, elastic polyurethane resin, meeting the requirements of HD 631.1 S2 and EN 50393. RAPID polyurethane resins consist of part A – a mixture or polyols, fillers and special additives - and part B – the hardener which is MDI (diphenylmethane-diisocyanate). The isocyanate is classified as a hazardous material and is labelled ‘harmful’ in accordance with European regulations. Outstanding properties include excellent hydrolytic stability and most impressive hydrophobic characteristics. RAPID 4300 has an excellent curing profile at various temperatures, allowing easy handling and curing in different environments. Permanent elasticity ensures long-term stability and accommodation of cable movement. As a result of the cross-linking reaction, the resin bonds strongly to functional parts, preventing the creation of voids between hardened resin and cable insulation.
The resins are supplied with gloves and instructions, and is supplied in a sealed bag. The two components are mixed in the double chamber bag to start the cross-linking process. The resin and hardener is most effective when mixed at room temperature for at least two minutes. The resin cures after mixing, to a tough flexible electrically inert mass. The resin has a ‘pot’ life of approximately 15 minutes to allow the joint to be filled, it gels in approximately 1 hour and is fully cured after 24 hours.
In ambient temperatures below 20°C follow recommendations in Technical Note below.
TECHNICAL DATA
- Material: Resin: Polyol blend
Hardener: Polymeric aromatic diisocyanate
- Type: Polyurethane
- Colour: Beige
- Mixing & Curing Times
Mix time: 2 minutes. Pot life at 20°C: 15 minutes
Gel time: Approximately 1 hour
Cure time: 24 hours
- Reaction Temp: 60°C
- Mix Ratio: Resin to hardener: 100:36 by weight
- Specific Gravity: 1.08
- Hardness: 30 Shore D
- Dielectric Strength: 11kV/mm
- Tensile Strength: 4 MPa
- Shelf life: 24 months
- Storage Temp: 5°C min/40°C max
- Elongation at break 30%
TECHNICAL NOTE
Resins do not cure rapidly in temperatures below 20°C. Either raise the ambient temperature or warm the joint, cable and connectors.
Note: Moisture can originate from a gas flame.
SDS
