Repsol YPF
Ruta
Liquid detergents
If polyethylene is subjected to internal and external tensions and, simultaneously, it contains certain polar liquids such as humectant agents and tensoactives, silicone oils and alcohols, its resistance to cracking will be decisive when selecting the most appropriate grade.
Resistance to cracking or splitting is known as ESCR, initials of the English nomenclature: "Environmental Stress Cracking Resistance."
This resistance improves when it diminishes the density (or the degree of crystallinity) and when the molecular weight increases, that is to say, it diminishes the melt flow index.
In recent years the Hdpe requirements demanded by bottle market for liquid detergent containers are continually growing. So, a search is made for products of high stiffness and of high resistance to splitting in tensoactive means at the same time, contrasting properties and therefore conflictive for their combined optimisation.
In the search for products of optimised stiffness/ESCR properties, "random" polypropylene was proven to give good results. Copolymer of propylene and ethylene at random confers high transparency to the container and excellent resistance to more aggressive tensoactive agents.
The range of special products for this application is:
For aggressive detergents:
- Alcudia 5203 (Hdpe)
- Alcudia 5803 (Hdpe Bimodal)
- Isplen PR230C1E (Random PP)
For soft detergents, such as bath gel, hair conditioner, shampoo, etc.:
- Alcudia 5502E (Hdpe)
