Resorcinol Bis(diphenyl phosphate) (RDP)

Name: Resorcinol Bis(diphenyl phosphate) (RDP)
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 125997-21-9

Resorcinol bis(diphenyl phosphate) (RDP) is a non-halogen, oligomeric aryl phosphate ester flame retardant widely used in PC/ABS and PC/PBT engineering plastic blends. Its higher molecular weight and oligomeric structure compared to monomeric phosphate esters result in significantly reduced volatility, migration, and hydrolytic sensitivity. RDP effectively achieves UL94 V-0 at 10–15% loading in PC/ABS while maintaining the good impact performance and dimensional stability demanded by electronics applications.

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Technical Specifications

appearance	Colorless to pale yellow liquid or low-melting solid
moisture (%)	<0.1
acid value (mgKOH/g)	<0.1
phosphorus content (%)	10.5–11.0
density (20°C, g/cm³)	1.29–1.31
viscosity (25°C, mPa·s)	700–1500

Applications

PC/ABS blends for consumer electronics enclosures and IT equipment housings
PC/PBT alloys for automotive interior panels and electrical connectors
Thin-wall injection molded parts requiring UL94 V-0 at 1.5–2.0 mm
Office equipment and copier machine housings
Electrical and electronic engineering plastic components under IEC 60695

Key Features

Oligomeric structure provides lower volatility and migration than monomeric phosphate FRs in PC/ABS
Achieves UL94 V-0 at 10–15% in PC/ABS with minimal impact on Izod impact strength
Non-halogen and non-antimony formulation meets RoHS and WEEE requirements for electronics
Low acid value (<0.1 mgKOH/g) prevents hydrolytic degradation of polycarbonate matrix