Sandy Sweetened Condensed Milk: Lactose Crystal Fix

Condensed milk · Texture & shelf life

Sweetened condensed milk that turns sandy

1. 1A gritty, sandy feel on the tongue from oversized lactose crystals
2. 2A dull, grainy surface instead of a glossy, even body
3. 3Thickening, sugar sediment or browning over shelf life

Usual causes

Missing or weak lactose seeding, wrong seeding temperature, slow or uneven forced cooling, too little agitation during crystallization, high storage temperature, sugar-to-water ratio off target

What we review

Crystal size under the microscope (target below 10 µm), seeding dose and point, cooling curves, sucrose and total solids, viscosity over age, color and storage temperature records

Typical levers

Seed lactose quality and dose, crystallization temperature profile, cooler and agitator settings, sugar ratio and preheating, storage and distribution temperature limits