Carbomer 980 vs. 981: Why One Letter Difference Ruins an Entire Batch
“We didn’t change the formula — we only switched carbomer batches. Why did the gel turn to water?”
That’s the question we hear most often from formulators troubleshooting a failed batch. In almost every case, the answer comes down to one of two things: you’re not actually using the same carbomer type, or you are — but the process doesn’t match it.
Carbomer 980 and Carbomer 981 differ by a single digit in their name, but their polymer architecture, neutralization requirements, and shear sensitivity are completely different. Apply 980’s process to 981, or force 981’s formula onto 980, and the result is predictable:
- Cloudy, hazy gel instead of clear
- A gritty, “balling” feel on application
- Viscosity dropping by half after two weeks in storage
Here’s the full selection logic and the process red lines — worth bookmarking before your next formulation run.
Which grade fits your product?
Start with what the finished product needs to do:
- Clear gel, or contains electrolytes (salts, ionic actives)? → Carbomer 981
- Needs a firm body, or suspends particles? → Carbomer 980
- Not sure yet? → Default to 981 — it has the wider margin for error.
Carbomer 981: The Clarity Choice
Best for: clear hand sanitizer gels, transparent serums, formulations containing niacinamide or vitamin C derivatives.
| Parameter | Guidance |
|---|---|
| Electrolyte strategy | If the formula contains salt or ionic actives, add 0.1% sodium citrate to buffer and prevent haze |
| Neutralizer | TEA or AMP preferred; target pH 7.0 ± 0.2 |
| Mixing | 800–1000 rpm; hydrate fully before neutralizing |
| Temperature | Tolerates up to ~50°C — a wide process window |
| Dispersion | Can be added slowly and directly to the water phase; low clumping risk |
Clarity checklist: 0.05–0.1% disodium EDTA (chelation) + NaCl under 0.3% + full hydration before neutralization. Reverse that last step and the gel will go cloudy no matter what else you do right.
Carbomer 980: Built for High-Strength Gels
Best for: toothpaste-grade suspension bases, scrub formulations, high-viscosity leave-on creams.
| Parameter | Guidance |
|---|---|
| Critical limit | Extremely electrolyte-sensitive — sea salt, lactic acid, or excess NaCl will collapse viscosity outright |
| Pre-dispersion | Must be pre-wetted in a non-aqueous carrier (glycerin or propylene glycol, ratio 1:5) — never pour directly into water |
| Neutralizer | NaOH or amine bases; target pH 6.5 ± 0.2 |
| Mixing | ≤500 rpm — higher shear breaks the polymer chain irreversibly |
| Temperature | Keep under 40°C; heat accelerates degradation |
Fish-eye fix: wet the 980 powder into a paste with a small amount of glycerin first, then add it slowly to the water phase. This one step eliminates roughly 90% of dispersion failures.
Failure Cases We See Most Often
| Symptom | Root Cause | Fix |
|---|---|---|
| Gel feels grainy on application | 980 poured directly into water — uneven hydration, undissolved particles | Pre-disperse 1:5 in glycerin, or switch to 981 |
| Viscosity drops after two weeks | Lactic acid used for pH adjustment in a 980 system | Switch to 981 + sodium citrate buffer, or remove the lactic acid |
| Gel is hazy, not clear | Neutralized before full hydration | Hydrate fully for 30 minutes, then neutralize slowly |
| Viscosity drops right after mixing | 980 homogenized at 1000 rpm | Reduce to under 500 rpm; switch to anchor stirring |
Technical Data & Sample Requests
Need full process sheets and COA data for your lab trials? We supply high-purity Carbomer 980 and Carbomer 981 for cosmetic and personal care formulations worldwide.
Request Free 500g Evaluation Samples on WhatsApp
Or email us at sales@pvpmaterials.com
Getting haziness, graininess, or viscosity loss in your carbomer gel and not sure whether 980 or 981 fits your active system? Contact us for samples, a COA, and a TDS — or browse the full Carbomer range.
