High-Efficiency Polyether Defoamer Manufacturer | Food Grade & Industrial Series
Nine KM grades across three EO/PO backbones — engineered for fermentation, papermaking, water treatment and concrete admixture systems, with cloud point tunable to your process.
Polyether defoamers are a direct extension of Kemaix's EO/PO derivative chemistry.
A Polyether Specialist, Not a Catalogue
Kemaix has spent two decades building nonionic surfactants and EO/PO derivatives — alcohol ethoxylates, PPG, and EO/PO block copolymers. Polyether defoamers come out of exactly that chemistry.
So we do not offer a catalogue of every antifoam type. We offer polyether foam control, done properly — with the ethoxylation capability, reactor control and batch consistency of a dedicated EO/PO manufacturer behind it.
That focus is the point. Cloud point, EO/PO ratio, molecular weight and persistence are all things we can engineer to your process, because we make the polyether ourselves rather than blending someone else's.
EO/PO polyethers become less soluble as temperature rises — the opposite of most surfactants.
Inverse Solubility: Why Polyethers Defoam Better When Hot
Polyether defoamers are built on ethylene-oxide / propylene-oxide chains (CAS 9003-11-6). Unlike conventional surfactants, their water solubility decreases as temperature rises.
Above the cloud point, the polyether comes out of solution as fine, insoluble droplets that spread across the foam lamella, displace the stabilising surfactant film and rupture the bubble — the point of maximum defoaming efficiency.
This is why polyethers suit hot, dynamic processes: fermenters, paper machine wet-ends, sugar evaporators and hot cleaning baths. Below the cloud point the product re-dissolves and acts as a persistent foam suppressant — knockdown and persistence from one chemistry.
Three Polyether Backbones, Nine KM Grades
Rather than one universal product, Kemaix builds foam control on three distinct backbones — each tuned to a different class of foaming system.
KM-DG — Glycerol-Based Polyether
Glycerol-initiated polyethers built for the toughest, longest-running foam: industrial fermentation. Engineered for outstanding persistence across long batch cycles rather than raw knockdown speed.
KM-DA — Fatty-Alcohol Block Polyether
Fatty-alcohol-initiated EO/PO block copolymers delivering fast knockdown at low cost. The workhorses for papermaking wet-end and concrete admixtures, where speed and economics decide.
KM-DE — Polyether Ester
Esterified polyethers with strong suppression in complex, high-solids or protein-rich systems — fermentation, sugar processing, paper sizing and wastewater, where simpler polyethers lose staying power.
KM Series Polyether Defoamers
| Grade | Backbone | Typical Applications | Key Feature |
|---|---|---|---|
| KM-DG100 | Glycerol polyether | Industrial fermentation | High-performance, long-lasting suppression |
| KM-DG200 | Glycerol polyether | Industrial fermentation | Excellent persistence in fermentation |
| KM-DG300 | Glycerol polyether | Industrial fermentation | Excellent persistence in fermentation |
| KM-DA100 | Fatty-alcohol block polyether | Papermaking (wet-end), concrete admixtures | Fast defoaming, cost-effective |
| KM-DA200 | Fatty-alcohol block polyether | Papermaking, concrete admixtures | Fast defoaming, cost-effective |
| KM-DA300 | Fatty-alcohol block polyether | Papermaking (wet-end) | Fast defoaming, stable performance |
| KM-DE100 | Polyether ester | Paper sizing, fermentation, sugar processing | Strong foam suppression in complex systems |
| KM-DE200 | Polyether ester | Fermentation, sugar processing | Strong foam suppression in complex systems |
| KM-DE300 | Polyether ester | Fermentation, wastewater treatment | Strong adaptability in complex systems |
Custom synthesis available — cloud point, EO/PO ratio and persistence can be tailored to a specific process. Request the grade-specific TDS/COA for full specifications.
Which Grade for Which Process
Foam is not one problem. A protein-rich fermenter, a paper machine wet-end and an aeration basin each fail in different ways — and need different chemistry.
Industrial Fermentation
Long batch cycles, protein-rich broth and constant aeration make persistence the deciding factor. Glycerol polyethers hold suppression across the full run; polyether esters add strength in complex broths.
Papermaking
Wet-end foam traps air, causes pinholes and disrupts drainage and sheet formation. Fatty-alcohol block polyethers give the fast knockdown a machine needs; polyether ester suits surface sizing.
Water & Wastewater Treatment
Aeration basins and surfactant-laden effluent foam persistently. Polyether chemistry leaves no silicone carryover, protecting downstream membranes and biomass.
Building Materials & Concrete Admixtures
Entrained air from polycarboxylate superplasticisers costs compressive strength. Fast-acting, cost-effective block polyethers control air content without over-dosing the mix.
Sugar Refining
Juice extraction, evaporation and crystallisation all foam, and any residue carries into a food product. Polyether esters give strong suppression with clean carryover behaviour.
Textile & Industrial Cleaning
Jet dyeing, scouring and high-agitation cleaning baths foam hard at temperature — where inverse solubility works in your favour.
When Polyether Chemistry Is the Right Fit
Every defoamer chemistry has a domain where it performs best. Polyether earns its place in aqueous systems with these characteristics:
| Process characteristic | Why polyether suits it |
|---|---|
| Elevated or variable temperature | Inverse solubility means efficiency rises above the cloud point — a natural fit for fermenters, wet-ends and evaporators. |
| Aqueous, surfactant-stabilised foam | Polyethers spread readily in water-based systems and destabilise surfactant-stabilised lamellae. |
| Downstream purity matters | No silicone carryover, so no oil spots on paper or fabric and no membrane or biomass fouling. |
| Long-duration foam suppression | Grade families can be selected for persistence rather than only fast knockdown. |
| Process-specific tuning needed | Cloud point, EO/PO ratio and molecular weight can be engineered to the system. |
Non-aqueous systems, extreme chemical environments or specific regulatory requirements may call for a different chemistry — tell us your process and we will say so honestly.
Supplied in 200 kg drums, 1000 L IBC and bulk.
Dosage, Handling & Packaging
Typical dosage: 0.25%–0.6%, sufficient for most fermentation requirements. Titrate to the minimum effective dose — over-dosing wastes product and, in biological systems, can reduce oxygen transfer.
Addition method matters. Continuous metered dosing generally outperforms a single shock dose, particularly across long fermentation cycles where persistence is the goal.
Packaging: 200 kg drums, 1000 L IBC tanks and bulk. Store cool, dry and ventilated. Custom synthesis is available where a process needs a specific cloud point or persistence profile.
Common Foam-Control Failure Points
⚠ Cloud point vs process temperature
Defoaming efficiency peaks above the cloud point. If a grade under-performs, check whether your process actually runs above it — a mismatch, not the product, is usually the cause.
⚠ Over-dosing
More is not better. Excess defoamer wastes product, can suppress oxygen transfer in fermenters and may affect downstream steps. Titrate to the minimum effective dose.
⚠ Shock dosing instead of metering
A single large addition knocks foam down then fades. Continuous metered dosing sustains control across long batches.
⚠ Wrong backbone for the system
A fast-knockdown block polyether will not hold a 100-hour fermentation, and a persistence-tuned glycerol grade is overkill on a paper machine. Match the backbone to the failure mode.
Frequently Asked Questions
What is a polyether defoamer?
An antifoam built on ethylene-oxide / propylene-oxide polyether chains (CAS 9003-11-6). It spreads at the air–water interface to rupture foam films, and because it contains no silicone it leaves no silicone carryover in the finished product or downstream equipment.
Why does a polyether defoamer work better at higher temperature?
Polyethers show inverse solubility: above the cloud point they become insoluble and disperse as fine droplets that rupture foam films most effectively. That makes them well suited to hot, dynamic processes such as fermenters, paper machine wet-ends and sugar evaporators.
How much defoamer should I dose?
Typical usage is 0.25%–0.6%, which satisfies most fermentation requirements. Titrate to the minimum effective dose — over-dosing wastes product and can reduce oxygen transfer in biological systems.
Which grade should I use for industrial fermentation?
Glycerol-based grades KM-DG100, KM-DG200 and KM-DG300 are engineered for persistence across long batch cycles. For complex or high-solids broths, the polyether esters KM-DE100, KM-DE200 and KM-DE300 provide stronger suppression.
Which grade suits papermaking or concrete admixtures?
Fatty-alcohol block polyethers KM-DA100, KM-DA200 and KM-DA300 give fast, cost-effective knockdown for paper machine wet-end and concrete admixture systems; KM-DE100 is used in paper sizing.
What is the difference between the KM-DG, KM-DA and KM-DE families?
They differ in the polyether backbone. KM-DG is glycerol-initiated and tuned for persistence in fermentation; KM-DA is a fatty-alcohol block polyether tuned for fast, economical knockdown; KM-DE is an esterified polyether for strong suppression in complex, high-solids systems.
Can Kemaix customise a polyether defoamer for my process?
Yes. Because Kemaix manufactures the polyether itself, cloud point, EO/PO ratio, molecular weight and persistence can be engineered to a specific foam-suppression requirement. Share your process conditions for a matched recommendation.
Tell Us Where Your Foam Is Coming From
Share your process — industry, temperature, foam source and downstream steps — and our technical team will recommend the KM grade and dosing approach, with TDS/COA and free samples for trials.
Get Technical Support & Samples