Alcohol-free SPF ~42 PFA, (PPD) ~15 Sunscreen Gel

Alcohol-free SPF ~42 PFA, (PPD) ~15 Sunscreen Gel

The Hallstar Company

Posted: November 22, 2011 12:25 PM CST

Application: Sun Care

This alcohol-free sunscreen gel uses butyloctyl salicylate and polycrylene in conjunction with avobenzone to deliver substantive broad-spectrum protection for boaters, climbers, and other outdoor enthusiasts. SPF and PFA were both determined in vivo (5 subjects) for a slightly firmer version of this formulation.

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Formula Procedure

In the main vessel, combine A and start mixing. Add B (no substitutions for chosen avobenzone). Cover vessel to prevent cyclopentasiloxane loss and start heating to 85°C. When above 80°C, add C in order. Add D with strong mixing without aeration. Maintain at 85°C for 20 min, then start cooling with prop mixing. When the batch is below 40°C, add E as needed to correct for evaporative losses. Continue stirring until a smooth, homogeneous gel. Perform final quality assurance checks. At 25°C, the formulation is an off-white translucent soft gel. Note: The cyclopentasiloxane flash point (DIN 51755) is about 77°C. Avoid sparks, static discharge and open flame.

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