City Chemical LLC manufactures N,N-Diethyl-p-phenylenediamine Sulfate (DPD Sulfate), supplied as a consistent white powder for customers who depend on a reliable colorimetric reagent. DPD Sulfate is the standard indicator compound behind the DPD method for measuring free and total chlorine, trusted by water treatment facilities and environmental testing labs that need dependable, repeatable results. City Chemical supplies this reagent to test kit manufacturers, and environmental safety programs that require a consistent specification, order after order.
City Chemical LLC is a privately-held, woman-owned chemical manufacturer headquartered in West Haven, Connecticut. Backed by more than a century of combined operating history, we specialize in rare, unusual, and hard-to-find chemicals that are difficult to source elsewhere.
Every order is backed by our ResponseAbilityTM commitment — a dedication to speed, accuracy, and responsiveness at every stage of the chemical purchasing process. Whether you need a small lab-scale quantity or a large industrial order, our team works to deliver the exact specification, packaging, and turnaround your project requires.
DPD Sulfate: Chemical Properties and Specifications
| Appearance | White |
|---|---|
| Form | Powder |
| Melting Point | 185.5–187°C |
| Purity | 99+% |
| Water Solubility | 1 g per 10 mL |
| Molecular Formula | C10H16N2 · H2SO4 |
| Molecular Weight | 262.33 |
| CAS Number | 6283-63-2 |
Common Uses & Applications: colorimetric reagent for chlorine testing (DPD method) in water treatment and environmental analysis, photographic color film developer, and cosmetic hair dye intermediate.
DPD Sulfate for Specialized Industries
DPD Sulfate is best known as the active ingredient behind the DPD method, the industry-standard colorimetric test for free and total chlorine in water. When it reacts with chlorine, DPD produces a pink-to-red color change proportional to chlorine concentration, giving lab technicians and field operators a fast, visual way to monitor water quality.
As a manufacturer of DPD Sulfate, City Chemical LLC serves water treatment facilities, environmental testing labs, and test-kit manufacturers who need a dependable reagent supply for ongoing chlorine monitoring programs. We also supply researchers and formulators working with this compound’s secondary applications in photographic color development.
Why Choose City Chemical?
Benefits of Choosing City Chemical Over Other Chemical Manufacturers
- DPD Sulfate, available for qualified chemical buyers
- Flexible packaging options, from small quantities to larger requirements
- U.S.-based sourcing and support from West Haven, Connecticut
- Experience serving industrial, aerospace, military, semiconductor and research markets
- Responsive customer service from a knowledgeable chemical supply team
- A broad catalog of rare, unusual, and hard-to-find chemicals
Responsive Chemical Sourcing and Custom Packaging
At City Chemical, ResponseAbilityTM is our commitment to giving every customer a faster, more reliable chemical purchasing experience — from first inquiry through final delivery. For a reagent like DPD Sulfate, where testing programs often run on a recurring schedule, that means consistent lead times and a specification you can count on for every reorder.
We offer custom, UN-certified packaging tailored to your process, whether you need small quantities for a single test kit line or larger volumes for an ongoing water treatment program.
Quality Backed by More Than a Century of Experience
City Chemical’s reputation is built on more than a century of combined experience supplying rare and high-purity chemicals to demanding industries. As a U.S.-based manufacturer, we support reshoring and supply-chain resilience, helping customers reduce risk and transit time while maintaining the strict quality standards our customers expect on every order.
Whether you’re running a municipal water testing program or manufacturing chlorine test kits at scale, City Chemical is ready to be your trusted source for DPD Sulfate.
Order DPD Sulfate
Ready to source DPD Sulfate for your next project? Contact City Chemical LLC today to request a quote, discuss packaging options, or ask a technical question. Our knowledgeable team is standing by to help you get the exact specification you need, delivered on your timeline.