Technical Data Sheet Polyester Curing Diacyl peroxides (Ambient/Elevated temperature) BP-50-FT Dibenzoyl peroxide CAS#94-36-0 50% Powder with phthalate Description:
White, free-flowing powder, consisting of 50% dibenzoyl peroxide, de-sensitised with aphthalic acid ester. This diaroyl peroxide is used as an initiator (radical source) in thecuring of unsaturated polyester resins. Main application: curing of castings and mouldedparts at ambient temperature in combination with amine accelerators. Technical Data:
Appearance .white, free-flowing powderPeroxide content. ca. 50% w/wActive oxygen . ca. 3.30% w/wDe-sensitising agent . phthalic acid esterBulk density .ca. 0.62 kg/lSolubility . insoluble in water, soluble in phthalatesHalf life time: 10h/1h/1min (0.1 m / benzene). 72°C/91°C/130°CCritical temperature (SADT) . ca. 60°CKick-off temperature . ca. 70°CRecommended storage temperature.below 30°CStorage stability as from date of delivery. 6 months
Application: POLYESTER CURING: Curing agent in powder form for UP resins at ambient tempera- ture in combination with amine accelerators. Usage level: 2-4% as supplied, together with 1-3% Accelerator A-305. Particular advantages: free-flowing powder, easy to handle, easy to dose. "Shelf life" (gel time of resin + peroxide) usually several weeks, but not without change in activity. "Pot life" (gel time of resin + peroxide + accelerator) very variable. CURING CHARACTERISTICS: Strong evolution of heat, relatively short mould release times, very good mould release factors (fMR = tMR/tgel). In thick laminates danger of stress cracking; in thin laminates tacky surface if air allowed to enter. Even at low ambient temperatures, relatively rapid curing. All amine accelerators cause marked yellowish- brown discolouration in finished parts. Above the "kick-off" temperature of 70°C, curing without accelerator is possible. Degree of cure is only moderate, even after post-curing. PROCESSING METHODS: In particular casting of highly-filled material (sealings, UP- concrete, UP foam), wet press moulding with and without accelerator, hand lay-up, injection and vacuum moulding. Thus, the product is very versatile.
All information is given in good faith, but without warranty, since the conditions of use are outside our control. Verification bythe user is recommended. Freedom from patent restrictions cannot be assumed. BP-50-FT Activity: Curing at ambient temperature:
"Amine Curing" of 2 mm thick GRP-laminates at 23°C
Curing at elevated temperatures:
Further information on suitable curing agents for unsaturated polyester resins is given inour application brochures on this subject. Contact: http://www.degussa-initiators.com
All information is given in good faith, but without warranty, since the conditions of use are outside our control. Verification bythe user is recommended. Freedom from patent restrictions cannot be assumed.
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Hamdee Y. Attallah, M.D. Office Address: Division of Endocrinology, Diabetes and Metabolism Education: 1992 B.S. Wayne State University, Detroit, MI M.D. Wayne State University, Detroit, MI Training: 2001-2005 Postdoctoral research fellow, Endocrinology, Diabetes and Metabolism, Stanford University, Stanford, CA Clinical fellow, Endocrinology, Diabetes and M