Karl Fischer Titration

Reagent Consumption

Stoichiometric iodine reduction forms the basis of this moisture measurement technique during resin preparation. Volumetric dosing delivers iodine until an electrometric endpoint signals complete water consumption in the stirred titration chamber. Coulometric generators produce iodine electrochemically inside the sealed cell to quantify trace water levels with high precision.

Reagents consume moisture continuously until the solvent mixture reaches absolute dryness prior to sample introduction. Electrical conductivity changes across platinum indicator electrodes dictate the exact moment the reaction reaches equilibrium.

Pellet Drying

Extrusion lines depend upon accurate moisture assays to verify the operational efficiency of desiccant hopper dryers. Virgin polyamide pellets require strict adherence to manufacturer specified moisture thresholds to prevent hydrolytic chain cleavage during plasticising. Regrind material absorbs atmospheric humidity much faster than virgin polymer, demanding separate testing protocols before blending occurs.

Excessive moisture degrades polymer molecular weight, causing silver streaks and brittle failure across finished automotive components. Datasheet values assume bone dry conditions, whereas shop floor conditions fluctuate widely throughout daily production shifts.

Thermal Degradation

Elevated water concentrations convert molten polyester polymers into shorter chain fragments inside the injection barrel. Injection moulding machines run high melt temperatures that flash trapped moisture into expanding steam pockets within thin walled parts. Structural integrity collapses when internal voids disrupt stress distribution under mechanical load.

Quality auditors reject moulded lots immediately whenever tensile strength testing reveals the presence of polymer hydrolysis. Accurate moisture measurement prevents premature part failure by stopping wet resin from entering the feed throat.