Type 1, BPO 75% water –wet granules Brief Introduction: BPO75% is a free ... temperature initiator for unsaturated polyester resins. Type 2, BPO 50% paste Brief Introduction: BPO 50% paste is a fine dispersion of dibenzoyl ... based on polyester or methacrylate resins. Type 3, BPO 50% Powder Brief Introduction: BPO 50% powder is a fine, free-flowing, non ...