ALVEOLIT

Alveolit is an outstanding material for use as cap seals.

Because of its excellent physical and chemical properties, Alveolit is well established as a seal material used in the cosmetics, industrial and medical fields. Special grades of Alveolit have been developed to meet requirements of packaging materials for direct contact with foodstuffs.

Description
ALVEOLIT is a closed-cell, physically cross-linked polyolefin sheet foam. The characteristics of Alveolit can be adjusted to suit specific requirements by fine-tuning the composition or the raw density.
Alveolit TA, Alveolit TA BR and Alveolit TA SF are proven, well-suited materials for cap seals.

Production:
Alveolit is produced in a three-stage process consisting of extrusion, cross-linking and foaming. The solid foaming agent is mixed and then extruded together with the polymer and other additives to form a compact unfoamed sheet.
The sheet is then cross-linked by exposure to a high-energy electron beam, before the foaming agent in the sheet is heat activated.
Foaming is free and in the vertical direction.

General properties:
Main characteristics of Alveolit:

• excellent physical properties
• fine and regular closed-cell structure
• high-quality surface on both sides
• high elasticity
• inert to a wide range of chemicals odourless
• ecologically and chemically neutral
• range of softness, depending on type and grade
• stable across a wide temperature range
• low water absorption values
• very low water vapour transmission
• high resistance against gas permeability

high resistance against gas permeability here as a PDF-file.

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