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Antifoams for Waterborne Coatings

Dow Corning® 71 and 74 Additives balance effective foam control with ease-of-use and good surface appearance.

Dow Corning® 71 and 74 Additives are 100% active polymeric silicone foam control agents designed especially to address the process foaming problems that plague waterborne coatings. Not only do these additives deliver effective foam control; they are also easy to incorporate and have a low tendency to cause surface defects.

Applications

Dow Corning 71 Additive is designed for use in overprint varnishes, waterborne parquet lacquers and flexographic inks. It is particularly suited for applications where high shear stability and ease of incorporation are needed.

Dow Corning 74 Additive is suitable for use in a variety of waterborne coatings, especially in wood coatings and automotive basecoats. It performs well at low concentrations and may be added during the pigment grind or let-down stage.

Features & Benefits

Dow Corning 71 and 74 Additives share these important features and benefits:

• 100% active – allows for lower use levels; gives you greater formulation flexibility.
• Self-emulsifying – makes it easier to incorporate the material into aqueous or polar coatings.
• No hydrophobic particles – eliminates particle separation problems that can cause surface blemishes.
• Balanced formulation – combats foam without causing surface defects such as craters and fisheyes.
• Stable polymer – can be incorporated under high shear
• Can be added during grind, letdown or post-added – gives you greater flexibility in the selection of an appropriate addition point.

Typical Properties

	Property		Dow Corning 71 and 74 Additives
	Primary Benefit		Foam control
	Compatible Binder Systems		Acrylic, alkyd, amide, epoxy, nitrocellulose, polyester, polyurethane, vinyl
	Typical Concentrations		71 Additive: 0.05-1.0% - 74 Additive: 0.1-1.0%
	Suitable Diluents		Water, isopropanol, propylene glycol, acetone, hexane
	FDA Compliance		74 Additive: 21 CFR 176.210
	Reactive Groups		Carbinol
	Percent Solids		100%
	Solvent		None
	Specific Gravity at 25ºC (77ºF)		1.0
	Flash Point, closed cup		100ºC (212ºF)
	Viscosity at 25ºC (77ºF)		71 Additive: 500 - 74 Additive: 750
	Surface Tension (0.1%), MN/m		71 Additive: 26.4 (aqueous) - 74 Additive: 26.9 (aqueous)

Learn more. Try a sample.

For more information about these high-performance silicone foam-control agents, assistance and samples are also available by calling Dow Corning Customer Service.