Mozzarella · Functionality

Mozzarella Oiling Off & Poor Stretch: Causes and Fixes

Short answer

Mozzarella that oils off, stretches short or blisters dark is usually stretched at the wrong pH. A pH at stretch outside the 5.15 to 5.30 window, too much or too little insoluble calcium, the wrong cooker-stretcher temperature or residence time, the cheese’s age and residual galactose are the common causes. The fix starts with the make-sheet pH curve and the bake test, then a narrower stretch-pH and temperature window.

Updated: 2026-11-05

Target: long, continuous, glossy mozzarella strands between the slice and the pie. — Plate B · LMPS mozzarella, bake test 450 °F / 232 °CShort stretch vs. long pull

Defect: short mozzarella strands that snap, free oil pooling on the surface and a torn, curdy melt. — Plate B · LMPS mozzarella, bake test 450 °F / 232 °CShort stretch vs. long pull

Mozzarella · Functionality

Mozzarella that won't stretch and melts oily

1Short, curdy strands that snap instead of pulling
2Free oil pooling yellow-orange on the pizza surface
3A torn, uneven melt instead of a smooth, fused layer

Usual causes: pH at stretch outside the 5.15 to 5.30 window, insoluble calcium too high or low, cooker-stretcher temperature and residence time, age and proteolysis, residual galactose
What we review: pH and TA curves, calcium, moisture and FDM, cooker water temperature logs, Schreiber melt and free-oil tests, bake-test photos at several ages
Typical levers: Starter ratio and inoculum, set and cook temperatures, stretch pH target, brine and cooling, shelf-age window for each customer spec

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