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High Purity Sodium Dichloroisocyanurate Dihydrate for Water Treatment

Sodium dichloroisocyanurate dihydrate (sodium dichloroisocyanurate dihydrate), also known as SDIC or sodium dichloroisocyanurate NADCC, is a high-efficiency disinfectant and oxidant widely used in water treatment, healthcare, food hygiene, and industrial processing. With rising global demand for safe, reliable, and cost-effective disinfection solutions, SDIC products are experiencing robust year-on-year growth, strongly supported by compliance with international standards (such as ISO 9001, NSF/ANSI 60, and FDA).

This technical overview provides a deep dive into sodium dichloroisocyanurate dihydrate’s manufacturing processes, industry trends, technical specs (sodium dichloroisocyanurate CAS: 51580-86-0), performance advantages, product comparisons, application cases, and customized solutions.

Industry Trends of Sodium Dichloroisocyanurate Dihydrate

Global Market Growth: According to MarketsandMarkets (2023), the global SDIC market is valued at USD 480 million in 2023, projected to reach USD 650 million by 2027 at a CAGR of 7.8%, driven by increased demand in municipal water treatment and healthcare disinfection.
Regulatory Compliance: Adoption of SDIC is strongly correlated with regulatory requirements in North America, Europe, and increasing regulations in APAC focusing on water safety.
Technological Innovation: Recent advances in granule formation, fast dissolution technology, and stabilized storage enhance product versatility and user safety.

Figure 1: Global SDIC Market Trend (2021–2027, source: MarketsandMarkets)

Manufacturing Process of Sodium Dichloroisocyanurate Dihydrate

The synthesis of sodium dichloroisocyanurate dihydrate leverages advanced reaction and purification technologies to ensure product purity, particle stability, and compliance with key global standards such as ISO 9001 and ANSI/NSF Standard 60.

Figure 2: SDIC Dihydrate Production Flow Chart – Key Process: Chlorination, Sodium Salt Addition, Crystallization, Purification

Reaction Technique: Chlorination of cyanuric acid in slightly alkaline media at controlled temperature (approx. 70°C), optimized for high conversion efficiency
Crystallization: Slow cooling to produce dihydrate crystals with robust particle morphology
Screening & QC: ISO 9001:2015-certified online sifting, high-sensitivity Fe/Na residue detection

Technical Specifications of Sodium Dichloroisocyanurate Dihydrate (SDIC)

Parameter	SDIC Dihydrate	Sodium Dichloroisocyanurate Products	Dichloroisocyanurate de Sodium (French Standard)
CAS Number	51580-86-0	2893-78-9	51580-86-0
Appearance	White crystalline powder, tablets or granules	Granules, tablets	Fine powder, tablets
Available Chlorine (%)	55% (±1%)	56-60%	55% min
Moisture (%)	<8.0	<5.0	<7.5
pH (1% solution)	5.5 – 7.0	5.0 – 7.0	5.0 – 7.0
Solubility in Water	230g/L (25°C)	230–250g/L	~225g/L
Standard	ISO 9001 / ANSI NSF60 / EN 12931	NSF, FDA, GB/T 36630	NF T 72-301

Figure 3: SDIC Dihydrate Technical Parameter Comparison (Chlorine, Moisture, Solubility)

Key Application Scenarios

Sodium dichloroisocyanurate dihydrate (SDIC) products are extensively deployed in:

Municipal and Industrial Water Purification: Offers stable residual chlorine, efficient sterilization (>99.99% E. coli kill rate), and cost savings over calcium hypochlorite.
Healthcare and Public Health: Effective for hospital surface, equipment, and instrument disinfection; meets stringent EU and US FDA compliance.
Food & Beverage Processing: Rapid biocidal action; leaves no off-flavors or harmful residues, widely used for fruit/vegetable washing.
Cooling Tower & Process Water Treatment: Chemically stable against UV/light decomposition, extending maintenance intervals by up to 30% in petrochemical and metallurgy sectors.
Emergency and Field Sanitation: Compact granules and tablets for rapid deployment in disaster relief, endorsed by WHO technical reports (TRS No. 1013).

Case Study: Metallurgical Industry Cooling Water System
In 2022, a major Chinese steel plant, operating a 1,800 m³/h open cooling system, replaced traditional calcium chloride with sodium dichloroisocyanurate dihydrate tablets supplied by Tenger Chemical. Post-implementation, microbial counts decreased from 780 CFU/mL to 4 CFU/mL, and corrosion rates were halved (from 0.11 mm/y to 0.05 mm/y), realizing direct savings upwards of USD 34,000/year on chemical dosing and maintenance.

Technical Advantages Over Competing Disinfectants

High Stability: Maintains >98% available chlorine after 12 months storage under ambient conditions (based on Tenger Chemical QC data, 2023).
Comprehensive Biocidal Spectrum: Effective against bacteria, viruses, protozoa, and algae; meets ISO 18184:2019 standards for viral inactivation.
Ease of Handling: Non-dusting granules and low-corrosion tablets facilitate lower labor costs and safer workflows vs. sodium hypochlorite.
Low Secondary Residue: Minimal trihalomethane/byproduct formation, confirmed by third-party tests (SGS Report No. 2023TENGER92-CN).
Wide pH Range: Activity retained between pH 5 and 9—suitable for diverse water conditions.

Manufacturer Comparison Table

Manufacturer	Product Form	Chlorine (%)	Certification	Application Focus	Typical Lead Time
Tenger Chemical (China)	Granules, Tablets, Powder	55–60	ISO 9001, NSF/ANSI 60, REACH	Water, Industrial, Food	7–14 days
Lonza (Switzerland)	Granules, Tablets	56–60	NSF, BPR Compliant	Municipal, Pool	21 days
Occidental Chemical (USA)	Granules, Powder	56–60	ANSI, ISO	Municipal, Hygiene	14–21 days

Figure 4: Trend of Key Parameters: Available Chlorine & Moisture (SDIC Dihydrate 2019–2023, data: Tenger Chemical QA)

Figure 5: Global SDIC Dihydrate Market Share by Application (2023)

Customized SDIC Dihydrate Solutions by Tenger Chemical

As a leading supplier with over 16 years' industry experience, Tenger Chemical offers tailored sodium dichloroisocyanurate dihydrate solutions based on application, industry standards, and regulatory compliance. Offerings include:

Custom particle size distribution and tablet compaction (10g, 20g, 1g tablets, 8–30 mesh granules)
Quality assurance per ISO 9001, ISO 14001, and FDA 21 CFR 178.1010 for food contact
Technical documentation and third-party batch certificates (SGS, Intertek, TÜV)
On-site engineering support for dosing and system integration
24/7 after-sales and application consultancy

Client Endorsements

“After switching to Tenger SDIC dihydrate, maintenance downtime dropped by 23%. The ISO 9001 compliance and SGS batch reports gave us full confidence.” — Water Utility, UAE
“Superior granule stability means fewer clogs and 15% less product waste compared to our previous supplier.” — South East Asia Municipal Water Plant

Frequently Asked Questions (FAQ) on Sodium Dichloroisocyanurate Dihydrate

Q1: What is the main material composition of SDIC dihydrate?: A: It comprises sodium salt of dichloroisocyanuric acid, dihydrate form (NaDCC·2H₂O), containing typically 55–56% available chlorine per ISO/GB25592-2020.
Q2: What product forms and specifications are common in the industry?: A: SDIC dihydrate is supplied in powder (100–200 mesh), granules (5–30 mesh), and tablets (1–20g). Custom sizing available according to GB/T 36630 and client needs.
Q3: Which standards guide SDIC dihydrate manufacturing and quality control?: A: Manufacturing is per ISO 9001:2015, Q/320382YHG 001-2019 (China), NSF/ANSI 60, and the EN 12931 disinfection standard.
Q4: What is the expected shelf life and how should it be stored?: A: Properly packed SDIC dihydrate retains efficacy for up to 2 years in dry, cool conditions (<30°C, RH<70%), per manufacturer data sheets and third-party studies (SGS, 2023).
Q5: How is installation and dosing controlled for optimal results?: A: Installation follows standard chlorination feeders compliant with ANSI/ASHRAE Standard 188. Dosing: 2–10 mg/L for water treatment; precise rates based on actual demand and supported by on-site consultancy.
Q6: Is SDIC dihydrate compatible with other water treatment chemicals?: A: It is compatible with most corrosion inhibitors and scale reducers, though direct mixing with acidic compounds (e.g. aluminum sulfate) should be avoided to prevent chlorine loss.
Q7: What certifications ensure product safety for potable water and food applications?: A: Tenger Chemical SDIC dihydrate is ISO 9001 and NSF/ANSI 60 certified. For food use, compliance with FDA 21 CFR 178.1010 is standard.

Delivery Schedule, Warranty & Customer Support

Standard Lead Time: 7–14 days after order confirmation (FOB China main port); urgent/air orders supported on request.
Quality Guarantee: All SDIC dihydrate products have 24-month warranty. Replacement or refund is provided for any non-conforming batch, per ISO warranty protocol.
After-Sales Service: Dedicated engineers available for real-time remote/onsite support. Application optimization, training, and post-sale analytics included.
Batch Traceability: Every shipment marked with unique QR code for instant access to QC certificates and SGS/ISO third-party test results.

References & Further Reading

“Sodium Dichloroisocyanurate: An Effective and Versatile Disinfectant in the Modern Industry”, Chemical Engineering Journal, Vol.404, 2023, Elsevier. [Read Full Text]
"WHO Guidelines for Drinking-water Quality, 4th Edition", World Health Organization, 2022. [WHO Publication]
“Disinfectant Action of Sodium Dichloroisocyanurate Dihydrate in Water Treatment”, Water Treatment Industry Forum (2023 Issue 6) [Forum Link]
“International Standard for Disinfectants — ISO 9001:2015”, ISO. [Standard Details]
Supplier Product Page: Tenger Chemical SDIC Dihydrate

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