1,3-Dichloro-5,5-dimethylhydantoin CAS 118-52-5

Chemical Name: 1,3-Dichloro-5,5-dimethylhydantoin
Synonyms: DCDMH; DICHLORO-DIMETHYL-HYDANTOINE; Dichlorodimethyl Hydantoin-DCDMH
CAS No.: 118-52-5
Molecular Formula: C5H6Cl2N2O2
Molecular Weight: 197.02
Appearance: Powder

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1,3-Dichloro-5,5-dimethylhydantoin (CAS 118-52-5) Ultimate User Guide

Table of Contents

1. Product Overview & Specifications

Parameter Value
CAS Number 118-52-5
Molecular Formula C5H6Cl2N2O2
Molecular Weight 205.02 g/mol
Appearance White crystalline powder
Active Chlorine Content 56-58%
Melting Point 132-136°C
Solubility Slightly soluble in water, soluble in organic solvents

Comparison with Alternatives

Feature 1,3-Dichloro-5,5-dimethylhydantoin Trichloroisocyanuric Acid
Chlorine Release Rate Controlled Rapid
pH Stability Broad range (4-10) Narrow optimal range
Storage Safety Non-hygroscopic Moisture-sensitive

2. Applications & Industry Uses

Water Treatment

Widely used in cooling towers, swimming pools, and industrial wastewater systems for microbial control.

Disinfection

Effective in food processing equipment sanitization, healthcare surface disinfection (1,000-2,000 ppm solutions).

Industrial Processes

Oxidizing agent in chemical synthesis and textile bleaching operations (typical dosage: 0.5-3% w/w).

3. Usage Guidelines

Dosage Recommendations

Application Concentration Contact Time
Drinking Water 2-4 mg/L 30 min
Surface Disinfection 0.1-0.5% 10-15 min

Safety Protocols

Always use PPE including nitrile gloves and eye protection. Store in cool (<30°C), dry conditions separated from acids.

4. Implementation Case Studies

Cooling Tower Biofilm Removal

Chemical plant in Ohio achieved 99.9% Legionella reduction using 15 ppm continuous dosing system.

Dairy Equipment Sanitization

European processor eliminated coliform contamination with 0.3% solution rinse cycles (25% cost reduction vs. hypochlorite).

5. Client Success Stories

Client A: Municipal Water Plant

Location: Texas, USA | Challenge: Trihalomethane formation | Solution: Switched from chlorine gas to DCDMH tablets | Result: 40% THM reduction while maintaining 0.5 ppm residual chlorine.

Client B: Food Processing Co.

Location: Guangdong, China | Issue: Mold in packaging area | Our Solution: 0.2% fogging treatment every 72 hours | Outcome: Zero microbial counts for 6+ months.

6. Get Customized Solutions

Contact our technical team for formulation assistance or bulk pricing:

Email: info@vivalr.com
Tel: (86) 15866781826

Request SDS, COA, or application notes:

Document Format Delivery Time
SDS PDF 2 hours
COA Excel/PDF 1 business day
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