Wondering whether to choose 94% anhydrous or 74% dihydrate calcium chloride? This professional buyer’s guide compares purity, physical forms (flake/pellet/powder), cost, hygroscopicity, and application scenarios to help you select the best CaCl₂ for deicing, desiccant, water treatment, and industrial use.
1. Introduction
Calcium chloride (CaCl₂) is one of the most versatile inorganic chemicals widely used in road deicing, dust control, industrial dehumidification, desiccant drying, water treatment, oilfield drilling, concrete antifreeze, and food processing.
For global industrial buyers, two grades dominate the market: 94% anhydrous calcium chloride and 74% dihydrate calcium chloride. Choosing the wrong grade will lead to insufficient performance, high logistics waste, unstable product quality, and even project failure.
This guide systematically analyzes core differences in purity, physical morphology, hygroscopic performance, cost structure, storage requirements, and applicable industries to support your cost-effective purchasing decision.
2. Core Grade Definition & Purity Standard
94% Anhydrous Calcium Chloride
Anhydrous calcium chloride refers to high-purity CaCl₂ with a minimum content of 94%. It contains almost no crystal water, features extremely strong hygroscopicity and fast moisture absorption speed, and belongs to high-end industrial and food-grade materials. Impurities such as sodium chloride, sulfate, and water-insoluble substances are strictly controlled to ensure stable performance in precision industrial scenarios.
74% Dihydrate Calcium Chloride
Dihydrate calcium chloride contains 74% effective CaCl₂ combined with fixed crystal water. It is the mainstream bulk industrial grade with moderate hygroscopicity, stable chemical properties, and outstanding cost performance. It fully meets the demand of conventional large-scale industrial applications and is the most widely used economical calcium chloride grade worldwide.
3. Physical Forms: Flake / Pellet / Powder Differences
Flake Calcium Chloride
Main Grade: 74% dihydrate (major), partial 94% anhydrous flake
Features: Low production cost, large contact area, fast dissolution, easy to absorb moisture in the air
Applications: Road snow melting, highway dust suppression, municipal wastewater treatment, concrete antifreeze, large-volume industrial auxiliary
Pellet / Prilled Calcium Chloride
Main Grade: 94% anhydrous spherical pellet (core export grade)
Features: Low dust, anti-caking, uniform dissolution, stable performance, convenient storage and transportation
Applications: Industrial desiccant, oilfield drilling fluid, refrigeration brine, high-end chemical dehydration, long-distance export orders
Powder Calcium Chloride
Main Grade: 94% anhydrous fine powder
Features: Superfine particle size, ultra-fast dissolution and moisture absorption
Applications: Fine chemical reaction, laboratory drying, pharmaceutical accessories, rapid dehumidification and dehydration
4. Application Scenario Selection Guide
Choose 94% Anhydrous Calcium Chloride If:
You need deep industrial dehumidification and high-strength desiccant drying
Working environment requires ultra-low temperature antifreeze (below -30℃)
High purity and strict impurity control are required
Used for oilfield drilling, fine chemical industry, new energy and pharmaceutical fields
Long-distance export with strict quality inspection standards
Choose 74% Dihydrate Calcium Chloride If:
Large-scale road deicing, snow melting and dust control projects
Municipal water treatment and construction concrete antifreeze
Cost-sensitive bulk industrial procurement
General food processing auxiliary and daily industrial circulation water treatment
5. Professional Purchasing Tips
Many buyers only compare unit prices and ignore effective content, resulting in higher comprehensive costs. For long-distance sea freight, 94% anhydrous calcium chloride has higher valid ingredient ratio, which can reduce shipping quantity and lower overall logistics expenditure. For conventional bulk civil engineering and environmental protection projects, 74% dihydrate flake is the most cost-effective choice with no performance redundancy.
In addition, anhydrous calcium chloride is highly deliquescent and must be stored in fully sealed, dry and rainproof warehouses; dihydrate calcium chloride has stable properties and is suitable for bulk stacking and long-term storage.
6. Get Custom Quote & Free Sample
We supply premium 94% anhydrous calcium chloride (pellet/powder/flake) and 74% dihydrate calcium chloride (flake/liquid), available in industrial grade and food grade. All products comply with international export standards, support customized packaging, FOB/CIF quotation, and third-party quality testing.
Contact our sales team to obtain free samples, official COA datasheets, and exclusive customized solutions for your industry scenarios.
