Section
| HS Code | 142746 |
| Product Name | RHODOLINE PO-07 Waterborne Mineral Oil Defoamer |
| Chemical Family | Mineral oil based defoamer |
| Appearance | Opaque pale yellow to amber liquid |
| Odour | Mild mineral oil odour |
| Water Solubility | Insoluble in water; dispersible |
| Ionic Character | Non-ionic |
As an accredited RHODOLINE PO-07 Waterborne Mineral Oil Defoamer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | RHODOLINE PO-07 Waterborne Mineral Oil Defoamer is supplied in 200 kg drums, ensuring safe handling and easy industrial use. |
| Container Loading (20′ FCL) | 20′ FCL: drums/IBCs of RHODOLINE PO-07 waterborne mineral oil defoamer, properly secured, labeled, and ventilated for safe transport. |
| Shipping | RHODOLINE PO-07 ships as a non-hazardous waterborne mineral oil defoamer. Pack in original containers, keep sealed, dry, and protected from freezing and extreme heat. Standard ground freight applies; no dangerous goods surcharge required. Ensure containers are upright with adequate ventilation during transport. |
| Storage | Store RHODOLINE PO-07 in its original, tightly closed container in a cool, dry, well-ventilated area. Keep away from direct sunlight, heat, and ignition sources. Avoid freezing and temperature extremes. Ensure containers remain upright and sealed to prevent spills or contamination. Segregate from strong oxidizers and incompatible materials. Follow label and SDS instructions for safe handling and disposal. |
| Shelf Life | Shelf life is 12 months from date of manufacture when stored unopened in original container at recommended temperatures. |
In low-PVC vinyl acetate/ethylene and acrylic latex formulations (below 45 % pigment volume concentration), air is entrained during high-speed pigment dispersion, during addition of cellulosic and associative thickeners, and during drum filling. The mineral oil carrier in RHODOLINE PO-07 supplies an insoluble organic phase with lower surface tension than the continuous aqueous medium; droplet entry into a foam lamella causes local surface tension gradients and film rupture by spreading and bridging mechanisms. The defoamer is added after the grind stage but before final rheology modification at 0.10–0.50 wt% of total formulation under dissolver tip speed below 5 m/s because high-shear addition mechanically emulsifies the carrier below the droplet size required for effective lamella rupture and shortens deaeration persistence during storage. Recoat cratering is assessed by applying a second coat over the dried first coat at 24 h using a 100 µm wire-wound drawdown bar on sealed Leneta charts; surface defects are evaluated visually according to ISO 28199-3. Volatile content is determined by ASTM D2369 and the defoamer contribution remains below the reporting threshold in low-VOC formulations. Package viscosity after accelerated aging at 52 °C for 2 weeks is checked by Stormer viscometer according to ASTM D562. Terminal products include interior wall paints, ceiling paints, and pigmented primers where production tolerances require stable Krebs unit values and no visible cratering after repainting.
Typically, air is entrained in pressure-sensitive adhesive compounding during high-speed dispersion of rosin ester tackifier dispersions and acrylic latex, and this foam persists in the low-shear coating bath because the dispersed tackifier raises the continuous-phase viscosity and slows lamella drainage. RHODOLINE PO-07 is added after the tackifier dispersion has cooled below 40 °C at 0.05–0.30 wt% of total adhesive. Low-shear planetary mixing at 20–40 rpm distributes the defoamer without generating the high shear that would emulsify the mineral oil droplets and produce persistent microfoam in the coating pan. Over-addition above 0.30 wt% introduces free mineral oil that can migrate through the dried adhesive matrix by concentration-dependent diffusion; this migration accelerates above the glass transition temperature of the acrylic phase and can reduce peel adhesion. Peel adhesion on stainless steel is measured according to ASTM D3330/D3330M Test Method A after 24 h dwell. For label and tape constructions with direct food contact, components are selected for compliance with 21 CFR 175.125 as applicable, and formulators should screen for migratable mineral hydrocarbons when low-migration packaging is specified. Terminal products include self-adhesive labels, splicing tapes, and protective films where optical clarity after lamination to corona-treated polyester is verified by visual inspection.
After the polymerization vessel reaches 99 % monomer conversion, the batch is transferred to a stripping vessel where residual vinyl acetate is removed under vacuum at 45–60 °C. Foam in the headspace during stripping carries latex solids into the condenser and reduces the heat-transfer coefficient across the condenser surface, extending the stripping cycle and increasing the risk of product contamination in recovered monomer. A mineral oil defoamer is metered into the letdown vessel at 0.05–0.20 wt% based on wet latex before vacuum is applied; anchor agitation is maintained at 50–100 rpm to distribute the defoamer without generating excessive shear. Over-addition creates coagulum that can be measured as grit retained on a 100 µm filter screen and can increase Brookfield viscosity measured at 25 °C and 60 rpm according to ISO 2555. The defoamer is added post-neutralization to avoid interaction with amino alcohols or ammonia used for pH adjustment; it does not participate in redox initiation. Storage stability of the finished binder is checked after 4 weeks at 50 °C; phase separation of mineral oil on the latex surface is considered a failure condition. Terminal products include binders for nonwoven saturation, carpet backing, and wood adhesives where low coagulum content is critical for spray application and clean filtration.
Microfoam in water-based flexographic inks originates from entrained air in the doctor chamber return line and from recirculation through low-shear pumps. The defoamer is added after pigment dispersion at 0.05–0.30 wt% of finished ink, because addition before high-shear pigment grinding can subdivide the mineral oil droplets and shorten foam control life. Foam persistence in the diluted ink is evaluated by bottle shaking according to ASTM D3601 at 25 °C. Defoamer efficiency may decline after repeated exposure to anilox shear because mechanical subdivision of the droplets reduces the bridging ability of the mineral oil phase. A production-scale flexographic press with chambered doctor blade and ceramic anilox of 400–600 lines/cm provides a severe shear environment that requires re-evaluation of initial laboratory defoamer dosage. Print defects such as pinholes and retraction are checked on corona-treated white polyethylene film at 120 m/min line speed. Over-addition can reduce ink transfer and create fisheyes on low-surface-energy substrates. Terminal products include corrugated board inks, paper sack inks, and surface-print flexible packaging inks where foam-related blemishes are unacceptable under visual inspection. When printed packaging is intended for food contact, mineral oil aromatic hydrocarbon content is screened against current European packaging migration guidance; published data for this specific ink configuration is limited.
| Application route | Typical addition range | Incorporation point | Relevant standard or regulation |
|---|---|---|---|
| Flat architectural latex | 0.10–0.50 wt% | Post-grind, pre-thickener | ISO 28199-3 |
| Pressure-sensitive adhesive | 0.05–0.30 wt% | After tackifier cooling below 40 °C | 21 CFR 175.125 |
| Vinyl acrylic binder stripping | 0.05–0.20 wt% | Letdown vessel before vacuum | ISO 2555 |
| Flexographic ink | 0.05–0.30 wt% | Post pigment dispersion | ASTM D3601 |
| Cementitious waterproofing slurry | 0.05–0.20 wt% | Liquid polymer before powder | EN 1015-7 |
Paper coating binder formulations based on styrene-butadiene latex and oxidized starch accumulate stable macrofoam in run tanks because the cooked starch raises aqueous viscosity and retards lamella drainage. RHODOLINE PO-07 is added at 0.05–0.20 wt% on total coating color after the starch has cooled to 55 °C but before high-shear mixing ahead of the blade coater. Addition directly to an uncooled starch cook above 65 °C can cause partial volatilization of the carrier and reduce defoamer efficiency. The coating color is applied on a short-dwell blade coater; blade runnability is assessed by monitoring blade load fluctuations and streaking. Air content in the wet coating color is measured by density difference; target density is maintained within production tolerance. For paper and paperboard intended for aqueous and fatty food contact, the finished coated substrate is evaluated under 21 CFR 176.170 and 21 CFR 176.180 as applicable, with attention to mineral oil migration from recycled fiber and coating additives. Terminal products include coated board for folding cartons, coated paper for labels, and inkjet receiving papers where surface smoothness and print mottle are sensitive to microfoam.
In two-component flexible cementitious waterproofing membranes, polymer latex additions increase air entrainment and reduce wet density, which can lower the cured membrane’s water tightness. A waterborne mineral oil defoamer is added to the liquid polymer component at 0.05–0.20 wt% of liquid polymer before the powder component is dispersed under a low-speed paddle mixer. Air content of the fresh mortar is measured by the pressure method according to EN 1015-7; excessive hydrophobic defoamer addition can depress air content below 3 vol% and produce pinholing in the cured membrane. Compatibility with water-reducing admixtures is influenced by the nonionic emulsifier package; separation of mineral oil on the slurry surface is an in-process incompatibility signal. Bond strength after 7 days curing is measured by pull-off according to EN 1542 as referenced in EN 14891 for liquid-applied cementitious waterproofing products. Published data for the specific effect of mineral oil defoamers on polymer-modified mortar adhesion is limited, so plant trials on the actual substrate are required before production release. Terminal products include two-component cementitious waterproofing slurries, polymer-modified tile adhesives, and patching mortars where air detrainment improves compaction and water tightness.
Evaluating foam control in pigment concentrates requires a distinction between grind-phase and letdown-phase addition. When a basket mill or high-speed dissolver is used to disperse titanium dioxide or carbon black, polyacrylate and polyphosphate dispersants produce micellar foam that stabilizes fines and lowers grinding efficiency. RHODOLINE PO-07 is introduced at letdown rather than at the grind stage because the high shear of the mill emulsifies the mineral oil carrier into droplets below the critical size for effective bridging, shortening foam control in the final tinting paste. A post-mix addition at 0.10–0.40 wt% of concentrate under paddle agitation below 300 rpm reduces entrained air without destabilizing pigment dispersion. Over-addition can cause color float in waterborne base paints because the defoamer’s hydrophobic fraction concentrates at the film surface. Dispersion stability is checked by grindometer fineness according to ISO 1524; compatibility with the letdown paint is evaluated by rub-out and drawdown on sealed charts. Terminal products include in-plant colorants, point-of-sale tinting pastes, and aqueous pigment preparations for architectural and industrial coatings where low-foam handling is required during automated dosing.
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RHODOLINE PO-07 is a waterborne-compatible mineral oil defoamer supplied as an opaque, non-aqueous dispersion of hydrophobized silica in refined mineral oil. The product is designed for direct addition into aqueous coatings, adhesives, filled construction products, and mineral plasters where it establishes low-surface-energy droplets that enter bubble lamellae and initiate film rupture. Manufacturer technical data list density at 0.86–0.90 g/cm³ at 20 °C according to ISO 2811-1:2016, Brookfield RVT viscosity at 300–800 mPa·s at 25 °C, and as-supplied pH at 6–8 by ISO 976:2013. The product is applied at 0.1–0.5 wt% of total formulation weight; the lower band is common for low-surfactant interior wall paints, while the upper band is reserved for highly filled plasters, grouts, and adhesive compounds. Because the defoamer functions through insoluble droplets, both under-addition and over-addition create measurable defects: under-addition leaves residual wet-film microfoam, and over-addition raises the probability of surface cratering or gloss loss.
The defoaming mechanism is not a simple solubility effect. RHODOLINE PO-07 must remain as discrete droplets in the aqueous phase; if the droplet diameter drops below 1 µm because of excessive shear or over-emulsification by excess nonionic surfactant, the droplets are too fine to bridge bubble lamellae and foam knockdown efficiency declines. If the droplet diameter exceeds 100 µm, the droplets can form visible oil exudation in the dry film. The operating window is therefore bounded at both sides. In a typical 2,000 L batch mixed at 1,000–1,200 rpm, post-add mixing for 10–15 min is usually sufficient; rotor-stator homogenization is not recommended because the resulting droplet-size distribution shifts below the active range. Published specific droplet-size distribution data for RHODOLINE PO-07 under defined shear fields are limited, so the boundaries are derived from general mineral oil/silica defoamer behavior.
On a 2,000 L Cowles disperser with a 300 mm sawtooth impeller operating at 1,200–1,500 rpm, the defoamer is normally split between the grind and letdown stages. The grind-side portion, typically 0.1–0.2 wt%, is introduced with the initial water, dispersant, and pigment charge so that air entrained during high-shear wetting does not form stable froth. The letdown-side portion, typically 0.05–0.15 wt%, is post-added after binder and associative thickener addition; this sequencing controls foam generated by thickener hydration and not by pigment wetting. A low-shear side-entering agitator can also be used, but incorporation time must be extended until the bulk density reaches the air-free target measured by ISO 2811-1:2016; published plant data for continuous side-entry mixing of this specific grade are limited.
| Parameter | Value or range | Test procedure |
|---|---|---|
| Density at 20 °C | 0.86–0.90 g/cm³ | ISO 2811-1:2016 |
| Brookfield RVT viscosity at 25 °C | 300–800 mPa·s | spindle 3, 20 rpm, supplier method |
| pH as supplied | 6–8 | ISO 976:2013 |
| Appearance | off-white to pale yellow opaque liquid | visual |
| Recommended dosage in aqueous paint | 0.1–0.5 wt% | supplier application bulletin |
| Silicone content | none declared | supplier safety data sheet |
In high-PVC interior wall paints with pigment volume concentration between 70% and 80%, microfoam remaining after thickener hydration can reduce film density, wet scrub resistance, and touch-up uniformity. RHODOLINE PO-07 is introduced at 0.1–0.3 wt% by total formula weight, with 50–60% of the dose added during pigment dispersion and the remainder after letdown. Foam knockdown is typically checked with a blender or shaker test based on ASTM D3601-88; the air-free density is recovered after incorporation. In matte films with 20° gloss < 5 units, mineral oil droplets produce fewer fish-eye defects than polydimethylsiloxane defoamers at equivalent active content because their spreading rate is slower and their local surface tension depression is lower. The trade-off is a lower ceiling for foam suppression in high-surfactant systems; above nonionic surfactant loadings of 5 wt% on polymer solids, the defoamer can become over-emulsified and may require pre-dilution or higher shear for adequate distribution. Published quantitative data for this specific product in low-VOC high-PVC formulations are limited, so dose-response should be confirmed in a drawdown series before production scale-up.
Foam evaluation should be performed on the liquid paint before solids separation. A graduated cylinder shake test based on ASTM D3601-88 records foam volume at 0 min, 5 min, and 30 min after agitation. For acceptable production control, foam collapse at 30 min should return the air-content density to within 0.02 g/cm³ of the air-free reference value measured by ISO 2811-1:2016. Films should then be applied by a spiral bar coater at 75 µm wet-film thickness and dried for 24 h at 23 °C and 50% RH before surface-defect inspection. This procedure links liquid-phase foam control to dry-film compatibility and prevents overdosage from being accepted on the basis of foam knockdown alone.
Mineral oil defoamer use in cementitious patching compounds and dispersion adhesives follows a different addition sequence. In a planetary mixer producing a 500 kg batch of acrylic-based construction adhesive, the product is typically added at 0.2–0.3 wt% into the plasticizer or filler premix rather than directly into the latex; this prevents localized high concentration and reduces the formation of oil pockets. The hydrophobic silica particle content in RHODOLINE PO-07 supplies a deaeration function that is visible as a more rapid collapse of air released during filler addition under vacuum; comparative vacuum release tests in the supplier literature use residual air content measured by ISO 2811-1:2016 density difference before and after a 5 min vacuum hold at 80 kPa absolute pressure. The same product is used at 0.3–0.5 wt% in mineral plasters and skim coats where coarse calcium carbonate and hydrated lime generate entrapped air; in those systems, the higher dose is needed because filler surface area and alkaline pH partially deactivate hydrophobic silica over mixing times above 30 min. Published data for highly alkaline silicate systems with pH above 12.5 are limited.
The principal difference is the physical state of the active defoaming species. RHODOLINE PO-07 relies on a three-component mineral oil/silica/nonionic emulsifier system in which solid silica particles create three-phase contact lines at the air–liquid interface; foam lamellae rupture by particle dewetting and oil spreading. Polysiloxane defoamers, by contrast, are low-surface-tension liquids that spread rapidly across the lamella surface; their surface tension is typically 20–22 mN/m measured by ASTM D1331-14, whereas mineral oil defoamers exert a more moderate surface tension depression. The higher spreading rate of polydimethylsiloxane defoamers provides stronger macrofoam knockdown at doses from 0.05 wt% to 0.3 wt%, but it also raises cratering risk in high-gloss and clear coatings. Polyether-modified siloxanes represent a third class; they are often added at 0.1–0.5 wt% and provide fine deaeration and leveling with lower impact on gloss, but they do not offer the same raw foam collapse as mineral oil/silica systems in filled matte formulations.
When replacing a silicone defoamer with RHODOLINE PO-07 in a high-gloss waterborne trim enamel, the dosage may need to be doubled from 0.1 wt% to 0.2 wt% to achieve equivalent knockdown, but the crater risk is proportionally lower because the mineral oil system does not form the same persistent low-energy monolayer on the substrate. In waterborne alkyd or acrylic direct-to-metal primers, this difference can reduce intercoat adhesion loss after sanding and recoating. The product is not recommended for clearcoats; haze from the dispersed oil/silica phase is a known boundary. Quantitative published data for direct substitution in high-gloss waterborne enamels is limited.
| Class | Typical dosage | Macrofoam knockdown | Microfoam/deaeration | Surface defect risk | Preferred application window |
|---|---|---|---|---|---|
| Mineral oil/silica defoamer such as RHODOLINE PO-07 | 0.1–0.5 wt% | moderate to high | moderate | low to moderate; gloss loss above 0.5 wt% | high-PVC interior paints, plasters, adhesives |
| Polydimethylsiloxane defoamer | 0.05–0.3 wt% | high | moderate | moderate to high; crater and fish-eye risk | high-foam industrial coatings, high-surfactant systems |
| Polyether-modified siloxane | 0.1–0.5 wt% | low to moderate | high | low | clear/high-gloss waterborne lacquers, low-VOC systems |
RHODOLINE PO-07 should be stored in sealed containers at 5–35 °C and protected from frost. The supplier indicates a shelf life of 12 months from date of manufacture when the original container remains unopened. If the product is exposed to freezing, it should be brought to 20–25 °C and homogenized with low-shear agitation before use; high-shear dispersion of a frozen-thawed sample can produce over-emulsified droplets and loss of defoaming efficiency. The operational addition window is narrow: below 0.1 wt% in high-PVC matte paints, residual microfoam may persist; above 0.5 wt%, the probability of visible surface oil separation, gloss reduction, and intercoat adhesion loss increases. For high-gloss waterborne enamels or clear lacquers, the product should not be used unless a compatibility drawdown under ASTM D523-14 confirms no significant 20° gloss change and haze measured by ASTM D1003-13 remains below the end-user specification. The product is not recommended for direct addition to cationically stabilized emulsions or to systems carrying high levels of amine-neutralized dispersants where pH exceeds 12.5; alkaline silica dissolution can reduce hydrophobic particle activity over extended storage. Supplier documentation states the emulsifier package is APEO-free; this allows formulation against EU Ecolabel criteria under 2014/312/EU where alkylphenol ethoxylates are excluded. Because the mineral oil fraction used in this product has a boiling range above 250 °C, it is not classified as a VOC for the purposes of 2004/42/EC; local regulatory schedules should still be checked.
On continuous dosing systems, RHODOLINE PO-07 is introduced upstream of a static mixer with at least 10 mixing elements and a mass-flow-based dosing rate of 0.1–0.3 wt%. The mixer should be positioned after the thickener injection point but before the final filtration stage, because fine filters below 100 µm can remove part of the defoamer droplet population and reduce foam control in the applied film. For batch operations, the dose-response should be verified by measuring air-free density after a standardized agitation cycle based on ASTM D3601-88; if the density recovery is slower than 30 min, the addition level is raised in 0.05 wt% increments rather than doubling the initial dose. This stepwise adjustment limits the risk of over-dosage defects that are more difficult to reverse than residual foam in waterborne mineral oil defoamer systems.
