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Partially delactosed whey powder was incorporated as an extender in rigid polyurethane foam formulations. Amounts of delactosed whey powder from 0 to 60.0~ partially replaced six types of polyether polyols (Oil No. 410 to 768). Polymethylene polyphenylisocyanate was the polyisocyanate and water was the blowing agent. Physical properties of the resultant products indicated acceptable textured, usable foams with good density control and dimensional stability for all whey powder additions. Increasing delactosed powder decreased compressive strength and increased open cells. Cost and property requirements would determine the amount of delactosed powder to add to foam systems.
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Hustad et al. (1972) studied this question.
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