Mould Resin P-N + Hardener P-25 (20 min)

Mould resin P-N

• Hard elastic, good edge strength
• Excellent grinding and polishing properties (Shore D-Hardness Ø 75)
• Thixotropic (non-drip)
• Manufactured in a vacuum, so optimally free of air bubbles and homogeneous

This two-component epoxy resin is coloured black for gel coats in-mould construction. Mould resin P-N is processed and cured at room temperature in conjunction with epoxy resin laminates. In contrast to resin and metal systems, the surfaces are polishable.

Consumption: approx. 0.5-1 kg/m² (thickness Ø 0.5 mm)

Hardener P-25

Hardener for Mould Resin P-N with a pot life of 20 minutes.

• Excellent chemical resistance (as far as possible styrene-resistant)
• Free of nonylphenol and benzyl alcohol

Mixing ratio: 100 : 25 parts by weight of resin to hardener
Processing time (100 g preparation at 20 °C): 20 minutes
Gel time (at 20 °C/1 mm layer thickness): approx. 2 hours
Curing time (at 23 °C): 24 hours

Temperature resistance: 70 °C

Processing instructions in GFK mould construction
Error-free application is possible on most release agents. If "eyes" should nevertheless form due to poor wetting of the substrate, the second layer of mould resin can be applied to the still sticky layer after gelation (several hours curing at room temperature). If two coats are applied, any imperfections are removed.

Procedure
1. Apply mould resin with a brush, layer thickness approx. 0.5 mm, allow to gel (approx. 2 h at room temperature).
2. If defects ("eyes") are formed due to the release agent, apply the second layer of mould resin, allow to gel.
3. Apply resin-rich coupling layer of laminating resin, glass fibre shavings + cotton flocks several mm thick.
4. Place glass fabric in the wet coupling layer and laminate on further layers of glass for reinforcement.

Carry out all work wet-in-wet so that the layers adhere well to each other.

Other structures are of course possible. Depending on the size and geometry of the mould, other build-ups are possible:

- Laminate directly onto the mould resin, but start with very fine fabric so that the structure does not push through.
- Laminate made of carbon fibre fabric, low mould weight, high rigidity.
- Laminate made of carbon fibre fabric and aramid honeycomb as an intermediate layer, very low mould weight with high stiffness.
- Laminate made of laminating ceramics; fast assembly, very stiff, but also higher mould weight.
- Massive, stiff moulds made of mould resin with a thick-walled backing of resin and fillers such as sand, Poraver and similar.

Technical Notice:
The Mould Resin P-N is based on an optimized formulation that completely eliminates potentially harmful reactive diluents. This not only enhances handling safety for the user but also improves the mechanical properties of the resin, particularly hardness and heat resistance.
 
Reactive diluents are typically used to reduce the viscosity of epoxy resins. However, they also dilute the concentration of reactive epoxy groups, leading to a lower crosslink density in the cured material. This reduction in crosslinking can decrease the hardness of the resin, making the material less rigid and less resistant to mechanical stress.
 
Furthermore, crosslink density significantly influences heat resistance, especially the glass transition temperature (Tg​). Reactive diluents can lower the Tg​ by making the polymer network less rigid. By eliminating these diluents, Mould Resin P-N  achieves improved material hardness and higher thermal stability, making it particularly suitable for demanding applications.