Sodium Dichloroisocyanurate (SDIC) is one of the most widely used chlorine-based disinfectants in water treatment and sanitation industries. Thanks to its rapid dissolution rate, strong oxidizing ability, and stable storage characteristics, SDIC has become a key chemical used in swimming pool disinfection, drinking water treatment, industrial water treatment, aquaculture, healthcare sanitation, and emergency water purification.
For buyers, distributors, and water treatment professionals, understanding the technical parameters and quality standards of SDIC is essential when selecting reliable products. These parameters directly affect disinfection efficiency, product stability, safety, and transportation compliance.
This article provides a comprehensive explanation of SDIC's technical specifications and quality indicators, helping procurement professionals make informed purchasing decisions.
What is Sodium Dichloroisocyanurate?
Sodium Dichloroisocyanurate (SDIC) is an organic chlorine compound with strong disinfecting and oxidizing properties.
Basic Information
|
Item |
Description |
| Chemical Name | Sodium Dichloroisocyanurate |
| Molecular Formula | C₃Cl₂N₃NaO₃ |
| Molecular Weight | 219.95 |
| Appearance | White crystalline powder, granules, or tablets |
| Chlorine Type | Stabilized chlorine |
| Solubility | Easily soluble in water |
When dissolved in water, SDIC releases hypochlorous acid (HOCl), the active disinfecting agent responsible for killing bacteria, viruses, algae, and other microorganisms.
Compared with traditional chlorine products such as calcium hypochlorite, SDIC offers better stability and easier transportation, making it a preferred disinfectant for many water treatment applications.
Main Technical Parameters of Sodium Dichloroisocyanurate
Understanding the key technical indicators helps determine whether SDIC meets industrial or drinking water treatment requirements.
Below are the most important parameters used in SDIC quality evaluation.
Available chlorine represents the amount of chlorine released by the product that contributes to disinfection. Available chlorine is the most important indicator of SDIC quality.
|
Product Form |
Available Chlorine |
|
SDIC Dihydrate |
55-56% |
|
SDIC Anhydrous |
≥ 60% |
Moisture content measures the water present in the product.
Typical Standard
|
Indicator |
SDIC Dihydrate |
SDIC Anhydrous |
|
Moisture |
8%≤ SDIC≤ 14% |
≤ 5% |
The pH value of SDIC solution affects its disinfection performance and compatibility with water systems.
Standard Range
|
Test Condition |
Standard |
|
1% Solution pH |
5.5 – 7.0 |
A slightly acidic to neutral pH allows SDIC to generate more hypochlorous acid (HOCl), which is the most effective disinfecting species of chlorine.
Maintaining the proper pH range ensures maximum microbial inactivation efficiency.
Sodium Dichloroisocyanurate Quality Standards
SDIC products must comply with various national and international standards depending on the intended application.
Common standards include:
|
Standard |
Region |
| HG/T 3263 | China Chemical Industry Standard |
| ISO Chemical Quality Standards | International |
| ASTM Specifications | United States |
These standards define requirements for:
- Available chlorine
- Moisture
- Insoluble matter
- Heavy metal limits
For drinking water treatment, stricter regulations apply.
Key compliance requirements may include:
- Low heavy metal content
- Controlled cyanuric acid levels
- Certified safety for potable water
Some markets require certification such as:
- NSF certification
- BPR compliance in the EU
- REACH registration
These certifications confirm that the chemical is safe for use in water treatment systems.
Swimming Pool Disinfectants often follow standards defined by pool industry organizations and local regulations.
Typical requirements include:
- Stable available chlorine content
- Controlled dissolution rates
- Minimal impurities
- Safe packaging and labeling
Manufacturers must ensure consistent production quality and reliable chlorine release performance.
Sodium Dichloroisocyanurate Packaging Specifications
Sodium Dichloroisocyanurate is typically packaged in moisture-proof containers to maintain product stability.
Common packaging formats include plastic drums, fiber drums, plastic bottles, and stand-up pouches—all of which offer excellent sealing properties. Sodium Dichloroisocyanurate suppliers typically offer customization options for both packaging and labeling.
Appropriate packaging protects SDIC from the following forms of degradation:
- Moisture
- Sunlight
- Exposure to air
Under proper storage conditions, a shelf life of 2–3 years can be ensured.
How to Evaluate a Reliable SDIC Supplier
When selecting an SDIC Supplier, buyers should consider the following factors.
Production Capability
Reliable manufacturers typically have:
- Large-scale chlorine chemical production facilities
- Automated production lines
- Strict quality control systems
Certification
Look for suppliers with certifications such as:
- ISO9001 quality management
- environmental and safety certifications
- regulatory compliance for target markets
Technical Support
Professional suppliers provide:
- product selection guidance
- dosage recommendations
- application technical support
These services ensure optimal product performance for specific water treatment needs.
As global demand for safe water and sanitation continues to grow, SDIC remains one of the most efficient and widely used chlorine disinfectants for swimming pools, drinking water systems, industrial water treatment, aquaculture, and public health sanitation.
Understanding the technical parameters and quality standards of Sodium Dichloroisocyanurate (SDIC) is essential for ensuring reliable and effective disinfection across different water treatment applications. Key indicators such as available chlorine content, moisture level, and pH value directly influence the product's stability, dissolution rate, and overall disinfection performance.
For distributors, importers, and industrial users, choosing SDIC that meets recognized quality standards and strict testing requirements is crucial to maintaining consistent water quality and operational safety. High-quality SDIC not only improves disinfection efficiency but also reduces chemical consumption, transportation risks, and long-term maintenance costs.
If you are sourcing reliable SDIC products for your market, working with an experienced manufacturer can make a significant difference in product quality, supply stability, and technical support.
About Xingfei SDIC Solutions
At Xingfei, we provide high-quality SDIC granules and tablets designed to meet the needs of distributors, water treatment companies, and industrial users worldwide. With strict quality control, stable production capacity, and flexible packaging options, we support our partners with consistent supply and professional technical guidance.
If you would like to learn more about our SDIC specifications, packaging options, or application recommendations, feel free to contact our team. We are always ready to help you find the most suitable disinfection solution for your water treatment needs.
Post time: Mar-19-2026