ENGINEERING TECH TIPS | 2 MAY 2025
Nylon Conditioning
Tech Tips from Our Engineers at Bamberger Amco Polymers
Polyamide (Nylon) Part Conditioning, Explained
Post-molding moisture absorption occurs over time in all nylon parts due to the hygroscopic nature of the material.
Key Terms
- Dry as Molded (DAM): the lowest moisture content (immediately after molding).
- Conditioned: the amount of moisture absorbed by a part, either naturally or through acceleration.
During processing, residual moisture acts as a plasticizer, potentially leading to physical and visual property changes. Molded parts will also absorb moisture from the atmosphere, which may cause swelling and dimensional changes.
Conditioning Methods
The rate at which conditioning occurs depends on factors such as temperature, storage medium, a part's wall thickness, and resin crystallinity. It can take hours, days, or even months.
- Passive Conditioning: the part absorbs moisture naturally from its environment without aid.
- Active Conditioning: various techniques are applied to accelerate moisture absorption.
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