1. Implementation
The processing of thermosets involves a change in the material's state, since it provokes an irreversible polyaddition reaction. Epoxy resins can be cold-injected if their viscosity allows, but they are often then held at a certain temperature for the time required for cross-linking.
We'll concentrate on molding the most difficult three-dimensional parts (mainly solid electrical parts, but the same principles apply to thick laminates, tooling, large powder moldings, etc.), and we'll confine ourselves to a few guidelines for two-dimensional problems (bonding, painting and coating).
When making large parts, the reacting mass plays an essential role. Once molecules have cross-linked, they transfer their heat of reaction to neighboring molecules. As resin is a poor conductor of heat, temperature cannot equilibrate instantaneously, so a runaway...
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Implementation
Control
References
Standards and norms
French Standards Association (AFNOR)
- Plastiques. Résines à l'état liquide ou en émulsions ou dispersions. Détermination de la viscosité apparente selon le procédé Brookfield. (remplace : NF T 51-210 : 1985-06). Indice de classement : T 51-083 - NF EN ISO 2555 - 09-99
- Plastiques. Polymères/résines à l'état liquide, en émulsion ou en dispersion. Détermination de la viscosité au moyen d'un viscosimètre rotatif...
Also in our database
Directory
Manufacturers – Suppliers – Distributors (non-exhaustive list)
Dow Chemical Company (brands: DEH, DEN, DER, FORTEGRA, XQ and XZ) http://www.epoxy.dow.com
Hexion Specialty Chemicals (brands: Epikote, Epon, Epikure, Epirez, Heloxy, Cardura, Veova) http://www.resins.com/resins/
...Websites
List of suppliers http://www.ides.com
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