Halogen-free V-0
Gives PC/ABS and PPE/HIPS UL 94 V-0 without bromine or chlorine.
RDP
Resorcinol Bis(diphenyl phosphate) (RDP) Supplier from China
Resorcinol bis(diphenyl phosphate) (RDP) is a halogen-free liquid phosphate flame retardant for PC/ABS, PPE/HIPS and other engineering plastics. SUNCHEM supplies RDP with a batch COA on every shipment; the TDS is sent on request.
CAS 57583-54-7 · Oligomeric aryl phosphate · Halogen-free
- Lot COA with every shipment
- Samples for your trials
- Technical support for your trial
Product overview & key benefits
RDP is an oligomeric aryl phosphate with about 10.7% phosphorus. It acts mainly in the condensed phase, promoting char, and it also plasticizes the polymer, improving melt flow. It is used in PC/ABS and PPE/HIPS housings for electronics and office equipment that must meet UL 94 V-0 without halogens.
RDP has a higher phosphorus content than BDP, so lower dosage reaches the same rating; BDP offers better hydrolytic and thermal stability. Acid value and TPP content are the numbers to compare.
Flame retardant and flow aid
Also plasticizes the melt, which helps thin-wall molding.
Specified on your terms
We quote against your phosphorus content, acid value, TPP content, viscosity and water and send the batch COA for each lot.
Technical specifications
| Parameter | Typical value |
|---|---|
| Product name | Resorcinol Bis(diphenyl phosphate) |
| Synonyms | RDP; tetraphenyl resorcinol bis(diphosphate) |
| CAS No. | 57583-54-7 |
| Type | Oligomeric aryl phosphate ester |
| Appearance | Colorless to pale yellow viscous liquid |
Phosphorus content, acid value, TPP content, viscosity and water limits depend on the producer grade and are stated on the TDS and batch COA; the limits for your order are confirmed in the quotation and contract.
Applications by Polymer
Where RDP is used, and what to confirm before you switch supply.
PC/ABS housings
The standard halogen-free flame retardant for PC/ABS housings of notebooks, chargers and office equipment.
Check before trial
- UL 94 class and thickness
- Acid value and TPP content
- Monthly volume
PPE/HIPS (mPPO)
Used in PPE/HIPS blends for electrical and electronic parts.
Check before trial
- Processing temperature
- Viscosity for your dosing pump
- Drum or IBC
PC, TPU and other resins
Used in PC, TPU, epoxy and other resins where a liquid phosphate is preferred.
Check before trial
- Polymer and rating
- Hydrolysis stability needs
- Sample for trials
Selection & comparison
Choosing the right RDP grade
| Your requirement | What usually works |
|---|---|
| PC/ABS with lowest dosage | RDP |
| Higher processing temperature or humid conditions | Consider BDP for better hydrolytic stability |
| Liquid dosing in compounding | Agree viscosity and container |
| Replacing an existing supplier | Send your current TDS or COA; we quote against the parameters you approve |
Packaging & storage
Packaging
Drums or IBC; tell us which suits your dosing system.
Storage
Keep containers closed in a dry store; moisture raises the acid value.
From first email to approved supply
Name the end use
Name the polymer and the fire rating you must meet — UL 94 class and thickness, LOI or cable standard.
Compare the numbers that matter
Phosphorus content, acid value, TPP content, viscosity and water.
Check hydrolysis stability
For parts used in humid conditions, compare RDP and BDP in your aging test.
Trial, then lock the spec
Compound a trial batch, run your fire and mechanical tests, and keep the approved lot COA as the reference.
Tell us your requirement. We match the grade.
Tell us the polymer, the fire rating you need, the quantity and the destination port. Add your current specification and we will quote against it.
| Information | Example |
|---|---|
| Application | PC/ABS, PPE/HIPS, PC, TPU |
| Required specification | Acid value, TPP content, viscosity |
| Packaging | Bag or drum size; pallets |
| Quantity | Sample / trial order / annual volume |
| Destination | Country and port |
| Documents needed | COA, SDS, TDS, RoHS/REACH |
Related products
Bisphenol A Bis(diphenyl phosphate)
Halogen-free liquid phosphate with high hydrolytic stability.
View product →Decabromodiphenyl Ethane
High-bromine additive flame retardant for styrenics, polyolefins and engineering plastics.
View product →Resorcinol Bis(diphenyl phosphate) (RDP) FAQ
What is RDP used for?
As a halogen-free flame retardant for PC/ABS and PPE/HIPS, and in PC, TPU and other resins.
What is the difference between RDP and BDP?
RDP has more phosphorus, so it needs a lower dosage; BDP has better hydrolytic and thermal stability.
Which parameters should I compare between offers?
Phosphorus content, acid value, TPP content, viscosity and water.
Can I get the TDS?
Yes. Send an inquiry with your polymer and target rating and we email the TDS.
