Meaning
Solvent absorption identifies the dimensional increase of a plastic part when exposed to methylene chloride. Dichloromethane swelling measures the crosslink density or the degree of chemical resistance inherent in a thermoplastic or thermoset resin. High values indicate a loose polymer network prone to degradation or mechanical failure in harsh environments.
Chemical Compatibility
Laboratory technicians submerge a test specimen in the reagent for a fixed duration to monitor volume change. Dichloromethane swelling occurs when small molecules penetrate the amorphous regions of the polymer chains. This expansion process softens the matrix and increases the probability of stress cracking under external load.
Processing Impact
Injection moulding parameters like hold pressure and cooling time influence the final crystallinity of the part. Proper processing limits the available free volume inside the component which reduces the rate of dichloromethane swelling during end use applications. Manufacturers track this metric to ensure the stability of seals and structural housings.
Material Economics
Regrind content often alters the structural integrity of the base resin. Recycled material frequently exhibits higher rates of dichloromethane swelling compared to virgin counterparts due to chain scission and increased porosity. Producers use this sensitivity to verify the quality of feedstock before manufacturing expensive finished goods.
