High-Tg epoxy cure
Gives cured epoxies a high glass-transition temperature and stiffness for composites and laminates.
DDS
4,4'-Diaminodiphenyl Sulfone (DDS) Supplier from China
4,4'-Diaminodiphenyl sulfone (4,4'-DDS) is an aromatic amine used as a curing agent for high-temperature epoxy resins, in the synthesis of polysulfone amide resin and other polymers, and as an intermediate for acid azo and disperse dyes. SUNCHEM supplies DDS in 25 kg drums with a batch COA on every shipment.
CAS 80-08-0 · C₁₂H₁₂N₂O₂S · Bis(4-aminophenyl) sulfone
- Lot COA with every shipment
- Samples for your trials
- Technical support for your trial
Product overview & key benefits
4,4'-DDS is an aromatic diamine with a sulfone bridge. Cured with epoxy resins it gives high glass-transition temperature and stiffness, so it is a standard hardener in composite prepregs, adhesives and electrical laminates. It is also a monomer for polysulfone amide (PSA) fiber and other heat-resistant polymers, and an intermediate for acid azo and disperse dyes.
The same molecule is the API dapsone. This page covers industrial grade; pharmaceutical grade is made under GMP and is quoted separately.
Monomer and dye intermediate
A monomer for polysulfone amide fiber and an intermediate for azo and disperse dyes.
Specified on your terms
We quote against your purity, melting point and particle size and send the batch COA for each lot.
Technical specifications
| Parameter | Typical value |
|---|---|
| Product name | 4,4'-Diaminodiphenyl Sulfone |
| Synonyms | DDS; 4,4'-sulfonyldianiline; bis(4-aminophenyl) sulfone |
| CAS No. | 80-08-0 |
| EC No. | 201-248-4 |
| Molecular formula | C₁₂H₁₂N₂O₂S |
| Molecular weight | 248.30 |
| Appearance | White to off-white powder |
| Packing | 25 kg drum |
Purity, melting point, particle size, moisture and ash 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 Industry
Where 4,4'-DDS is used, and what to confirm before you switch supply.
Epoxy curing agent
A hardener for high-temperature epoxy systems in composite prepregs, structural adhesives and electrical laminates.
Check before trial
- Resin system and cure cycle
- Particle size for dispersion
- Purity and melting point
Polysulfone amide and other polymers
A monomer for polysulfone amide (PSA) fiber and other heat-resistant polymers.
Check before trial
- Polymer route
- Purity and color
- Monthly volume
Dye intermediate
An intermediate for acid azo and disperse dyes.
Check before trial
- Dye you make
- Impurity limits
- Packaging
Selection & comparison
Choosing the right DDS grade
| Your requirement | What usually works |
|---|---|
| Epoxy prepregs and adhesives | Specify purity and particle size (micronized if needed) |
| Polymer synthesis | Specify purity and color |
| Dye intermediates | Standard industrial grade |
| Pharmaceutical use (dapsone) | Not this grade — ask for a GMP source |
Packaging & storage
Packaging
25 kg drums.
Storage
Keep drums closed in a cool, dry store away from light and oxidizers.
From first email to approved supply
Name the end use
Epoxy curing, polymer or dye: purity and particle size follow from it.
Compare the numbers that matter
Purity, melting point, particle size, moisture and ash.
Check dispersion
For epoxy, particle size decides how evenly DDS disperses; test in your resin.
Trial, then lock the spec
Run a sample in your own process and keep the approved lot COA as the reference for contract limits.
Tell us your requirement. We match the grade.
Tell us your resin system or product, the quantity and the destination port. Add your current specification and we will quote against it.
| Information | Example |
|---|---|
| Application | Epoxy curing, PSA fiber, dyes |
| Required specification | Purity, melting point, particle size |
| Packaging | 25 kg drums |
| Quantity | Sample / trial order / annual volume |
| Destination | Country and port |
| Documents needed | COA, SDS, TDS, REACH statement |
Related products
4,4'-Diaminodiphenyl Sulfone (DDS) FAQ
What is 4,4'-DDS used for?
As a curing agent for high-temperature epoxy resins, a monomer for polysulfone amide resin and other polymers, and an intermediate for acid azo and disperse dyes.
How is DDS packed?
In 25 kg drums.
Is this the same as dapsone?
It is the same molecule, but this page covers industrial grade. Pharmaceutical dapsone must come from a GMP producer and is quoted separately.
Which parameters should I compare between offers?
Purity, melting point, particle size, moisture and ash.
