Storage and stability: three overlooked points

These are acrylates: heat, light and contact with initiators can trigger polymerization. The MEHQ inhibitor works together with dissolved oxygen, so full nitrogen blanketing actually reduces its effectiveness.

Store in the dark, sealed, below 38℃, and avoid long-term nitrogen padding. Use opened containers promptly and reseal immediately to keep out moisture and air.

Moisture is the silent problem: phosphate esters hydrolyse slowly, releasing free phosphoric acid, which shows up as rising acid value, haze and falling adhesion. Sampling equipment must be dry.

Viscosity is strongly temperature dependent. Equilibrate samples to 25℃ before measuring, or batch data are not comparable.

Shelf life is normally 12 months. Beyond that, retest acid value, water content and appearance before use.