Tool 05 · Before you run the batch

Gellan Gum Formula Pre-Check

Describe the formula and the process, and see which combinations are known to cause trouble before anything is weighed out.

Before you use these numbers

Gellan gum is dosed by outcome, not by rule: the same polymer behaves differently at a different water hardness, total solids, grade and fill temperature.
Low acyl gellan gum needs a divalent cation to gel, so a soft-water system will thicken without setting however much is added.
Dosage ranges on this site describe where most products land; they are a starting point for a bench trial, not a specification.
The authoritative figures are the specification in the Technical Handbook §4 and the limits in the Method of Analysis Appendix B.

This is a pre-check, not a verdict. It compares your inputs against general gellan gum behaviour and the experience behind this site. It is not a specification, not a guarantee of performance, and a warning here does not mean a formula will fail. Every point below is a starting hypothesis for a bench trial.

Product What kind of product is it?

Job to be done What should the gellan gum do?

Grade Which grade is in the formula?

Heat process The hottest step the product sees.

Hydration temperature How hot the gum actually gets in the water phase.

Water hardness Calcium and magnesium in the water.

Sequestrant Citrate, phosphate or similar.

Clarity Does the product have to be clear?

pH Of the finished product.

Protein (%) Total protein in the product.

Dose (% w/w) Gellan gum in the finished product.

Sugars or solids (%) Total soluble solids.

Sodium (mg/L) Optional. High in electrolyte and sports drinks.

Other hydrocolloids Optional. What else is thickening the system?

Rules are directional. Two formulas with identical numbers can behave differently with a different water source, a different lot or a different holding time. Nothing here replaces a trial in your own system.

How to read the result

What this check does, and what it cannot

It flags combinations, not ingredients

No single input is wrong on its own. Every warning describes a pairing — acid with no sequestrant, high acyl with a retort, a dose below what the job needs. Change one side of the pair and the warning usually disappears.

It does not know your water, your lot or your line

Water hardness, lot-to-lot strength and mixing equipment can all move the outcome. Where the answer depends on something this form cannot see, the rule says so instead of guessing.

An empty result is not an approval

If nothing is flagged, that means no known conflict matches these inputs. It does not mean the formula has been validated. Hydration, dosing accuracy and cooling rate still decide the outcome.

Specification

What the powder itself carries

Production ranges, not marketing targets.

Gel strength, low acyl 900 – 1300 g/cm² That is a range, not a promise of any single figure. Design a formula against 900 and carry 10–15% headroom; a formula built around the middle of the range will be short whenever a lot lands at the bottom.

Light transmittance 85% minimum Measured at 497 nm on a 0.50% low acyl gel set at 20 °C. A specification above 90% needs a high-clarity grade selected for it, and usually comes with a strength trade-off.

Strength above 1300 Specify it on the order Above the normal range you are asking for the top of the distribution. Say so on the purchase order and ask for the strength floor in writing, rather than assuming the next lot will land there.

Other tools

Keep going

Three more decision aids for the same problem set.

Dosage Calculator Estimate a starting point Grade Selector High acyl or low acyl? Dosage Reference Table By application Troubleshooting Tree Diagnose the cause