Defoamers for Gypsum Slurry Systems & Plasterboard Production
Gypsum-based systems — high-speed plasterboard, wall plasters, and calcium sulfate self-leveling compounds — need tight air-void control. Foam from the pin mixer and continuous pouring lowers dry-core density and spoils the board face.
INVINO® supplies non-ionic polyether and modified silicone defoamers that collapse macro-bubbles fast without delaying set. They keep the slurry uniform across high-speed forming lines and protect paper-to-core bonding. For other binders, see our Construction Industry Defoamers overview.
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Foam Challenges in Gypsum Slurry Systems
Micro-bubbles rising to the surface cause pinholes and craters. Good deaeration gives a dense, smooth board face fit for decorative paper lamination.
Trapped air leaves weak, irregular pockets in the core. Our defoamers keep the slurry uniform for a rigid, even crystalline core on drying.
Uncontrolled foam shifts the board weight-to-volume ratio. Consistent defoaming locks a predictable slurry density to meet production limits.
Recommended Grade & Gypsum Application Areas
| PRODUCT CODE | CHEMICAL TYPE | Application / Best For | KEY PERFORMANCE | TECHNICAL FILES |
|---|---|---|---|---|
| INVINO-8061 | Non-Ionic Polyether | Gypsum board manufacturing (continuous mixers & forming belts) | Instant slurry macro-foam collapse; speeds dewatering without hurting core-to-paper adhesion. | DOWNLOAD TDS |
| INVINO-8061 | Non-Ionic Polyether | Gypsum self-leveling mortar (pump-applied floors) | Expels pump-entrained air for a flat underlayment free of pinholes and layer scaling. | DOWNLOAD TDS |
A modified silicone emulsion grade is also available where stronger persistence is needed — ask our lab for a recommendation based on your slurry.
Technical FAQ for Gypsum Formulators
Q: Will the defoamer slow the setting time of the gypsum slurry?
A: No. INVINO-8061 collapses foam fast without delaying the hydration or setting of calcium sulfate, so the set schedule on the board line stays on track.
Q: Does the defoamer affect paper-to-core bonding on gypsum board?
A: No. By controlling foam and keeping the core dense, it supports uniform dewatering on the forming belt and protects core-to-paper adhesion.
Q: Can it prevent surface pinholes on the board face?
A: Yes. It releases entrained micro-bubbles before they reach the surface, giving a dense, smooth face suitable for decorative paper lamination.
Q: Is it suitable for gypsum self-leveling mortar?
A: Yes. It expels air introduced by floor pumps so the self-leveling underlayment stays flat and free of pinholes or layer scaling.
Q: Does it keep board weight (density) consistent?
A: Yes. Controlling foam variation locks a predictable slurry density, so board dry weight stays within production limits.
Request Your Gypsum Defoamer Solution
Standard Protocol for Gypsum Sample Verification
System Parameter Submission
Share your gypsum source, slurry temperature, foaming-agent dosage, and target set time.
Free Lab Test (Slurry Agitation + Set Time + Core-to-Paper Bond)
Our lab runs a high-speed slurry agitation test, set-time check, and core-to-paper bond verification on your formula — free of charge.
Free Sample Dispatch
Free trial samples ship via air express for board-line and self-leveling mixer trials. No MOQ at sample stage; buyer covers freight, refunded on the first bulk order.