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White powder
1592-23-0
C36H70CaO4
607.02
216-472-8
Insoluble in water
Product Description
Calcium Stearate is the calcium salt of stearic acid and related long-chain fatty acids. It belongs to the group of materials known as metallic soaps.
It is normally supplied as a fine, white or nearly white powder. Unlike sodium and potassium soaps, Calcium Stearate is practically insoluble in water.
Calcium Stearate is widely used as:
A lubricant in polymer processing
A mold-release agent
An acid scavenger
A PVC co-stabilizer
A water-repellent additive
A flow and anti-caking aid
A processing aid for rubber, coatings and paper
Commercial Calcium Stearate may contain calcium salts of both stearic and palmitic acids, depending on the fatty-acid feedstock. The formula C36H70CaO4 represents idealized calcium distearate.
AOZUN supplies industrial-grade Calcium Stearate for plastics, coatings, rubber and construction applications.
Property | Information |
|---|---|
Product name | Calcium Stearate |
CAS number | 1592-23-0 |
EC number | 216-472-8 |
Molecular formula | C36H70CaO4 |
Alternative formula | Ca(C18H35O2)2 |
Molecular weight | 607.02 g/mol |
Chemical class | Calcium metallic soap |
Appearance | Fine white powder |
Water solubility | Practically insoluble |
Typical elemental calcium | Approximately 6.6% theoretical |
Melting or softening range | Grade- and method-dependent |
Main functions | Lubricant, release agent, acid scavenger and hydrophobic additive |
Product form | Powder; other forms may be available by grade |
Common packaging | PE-lined industrial bags |
Reference properties should not replace the approved sales specification or batch certificate of analysis.
Test item | AOZUN specification |
Appearance | Fine white powder |
Calcium content | 6.5 ± 0.6% |
Free acid | ≤0.5% |
Loss on drying | ≤3.0% |
Melting range | 140–158°C |
CAS number | 1592-23-0 |
Standard packaging | 20 kg PE-lined woven bag |
The specification applicable to a shipment must be confirmed in the quotation and batch-specific COA.
Additional parameters such as particle size, bulk density, fatty-acid source, ash and filtration performance may be discussed for application-sensitive orders.
Calcium content may be reported using different bases.
For ideal calcium distearate:
Elemental calcium is approximately 6.6%
Calcium oxide equivalent is approximately 9.2%
Total ash may commonly appear around 9%–10%
A value of 6.5% calcium and a value of approximately 9% CaO may therefore describe comparable materials using different reporting bases.
Buyers should check whether a specification reports:
Elemental calcium
Calcium oxide
Total ash
Sulfated ash
Result on an as-is or dried basis
Values should not be compared until the test basis is confirmed.
Free fatty acid represents unreacted fatty acid remaining in the product.
It can influence:
Lubrication balance
Melt behavior
Odor
Color
Plate-out
Dispersion
Storage stability
Interaction with other additives
Lower free acid is often preferred for tightly controlled polymer processing. A small amount may be acceptable or useful in other formulations.
Excess moisture can cause:
Caking
Poor powder flow
Feeding variation
Surface defects
Changes in extrusion behavior
Inaccurate dosing
The test method should be confirmed because loss on drying may include volatile matter in addition to water.
Particle size affects:
Dispersion
Surface area
Lubrication efficiency
Acid-neutralization rate
Dust formation
Powder flow
Screen-pack pressure
Finished-product appearance
A fine powder may disperse rapidly but generate more airborne dust. Granular or low-dust forms may provide cleaner handling but require appropriate mixing conditions.
Bulk density affects bag volume, feeder calibration, conveying and storage capacity.
Two Calcium Stearate grades can have similar chemical specifications but very different feeding behavior because of particle structure and bulk density.
Commercial Calcium Stearate does not always display one sharp melting point. Its observed behavior may depend on fatty-acid composition, moisture, preparation route and test method.
Some grades soften before becoming a viscous melt. For process development, use the supplier’s tested melting or drop-point value rather than relying on one general database number.
In a direct process, stearic acid or a fatty-acid mixture reacts with a calcium source.
Direct-process products may offer:
Efficient large-scale production
Controlled fatty-acid composition
Relatively dense particles
Good performance in many industrial formulations
Reaction completion, residual free acid and particle finishing must be carefully controlled.
In a precipitation process, a soluble stearate reacts with a soluble calcium salt, producing insoluble Calcium Stearate.
Precipitated grades may provide:
Fine particle size
High surface area
Different particle morphology
Rapid dispersion
Low free fatty acid when properly processed
Washing and drying are important because residual soluble salts and moisture may affect downstream performance.
Products with similar calcium and free-acid values may still behave differently because of:
Particle morphology
Surface area
Porosity
Residual salts
Fatty-acid distribution
Drying history
Milling or granulation method
Application testing is therefore more reliable than selecting a grade by assay alone.
Calcium Stearate can perform several functions at the same time.
Its long hydrocarbon chains reduce friction between:
Polymer particles
Polymer melt and metal equipment
Fillers and resin
Molded parts and mold surfaces
This may improve flow, reduce sticking and support smoother processing.
The balance between internal and external lubrication depends on polymer compatibility, concentration, temperature and other additives.
Calcium Stearate can migrate toward interfaces and reduce adhesion between the finished part and the mold.
Excessive use may affect printing, coating, bonding or surface appearance, so the optimum level must be established experimentally.
Residual catalyst chlorides, pigments, fillers, flame-retardant components and other raw materials can introduce acidic species into a polymer.
Calcium Stearate can neutralize some acidic residues, helping to:
Protect processing equipment from corrosion
Improve processing stability
Protect antioxidant performance
Reduce undesirable reactions
Support color stability
It is not a replacement for the entire antioxidant or stabilizer package.
Calcium Stearate may coat particle surfaces and reduce interparticle friction. This can improve the flow and dispersion of selected powders, fillers, pigments and masterbatches.
Calcium Stearate is selected according to its chemical purity, particle properties and regulatory grade.
In PE and PP, Calcium Stearate is commonly used as an acid scavenger and processing lubricant.
It may help neutralize acidic catalyst residues and protect polymer additives during extrusion.
Important performance indicators include:
Calcium content
Free fatty acid
Moisture
Particle size
Dispersion
Color
Filtration index
Residual inorganic solids
Film and fiber applications may require a low-filtration-index grade. Poorly dispersed particles or residual inorganic material can increase extruder screen-pack pressure and contribute to film defects.
In PVC, Calcium Stearate may act as:
A lubricant
A release agent
A component of calcium-zinc stabilizer systems
An acid-neutralizing co-stabilizer
A processing aid
It should not automatically be described as a complete PVC heat stabilizer when used alone.
Lubrication must be balanced carefully. Excess external lubrication can delay fusion, while insufficient lubrication can increase friction and sticking.
Calcium Stearate may be used in selected engineering plastics, filled compounds and color masterbatches to support flow, dispersion and mold release.
High-temperature applications should evaluate thermal color, volatile content and deposit formation.
In rubber compounds, Calcium Stearate may function as a processing lubricant, release agent or dispersion aid.
It can affect:
Mixing
Filler dispersion
Mold release
Surface finish
Cure behavior
Adhesion
Its effect on cure rate and physical properties should be tested in the complete formulation.
Calcium Stearate can reduce water absorption in:
Cementitious products
Concrete blocks
Pavers
Dry-mix mortars
Plasters
Construction boards
Its hydrophobic fatty chains can reduce capillary water penetration and help control moisture-related surface effects.
Performance depends on particle dispersion, cement chemistry and dosage. Excessive addition may affect air content, hydration, adhesion or mechanical strength.
Water absorption, compressive strength, setting time and efflorescence should be evaluated together.
Calcium Stearate may be used as a lubricant, anti-dusting additive, coating aid or water-repellent component in selected paper formulations.
Particle size and dispersion quality are important for coating uniformity and surface finish.
In coatings and pigment systems, Calcium Stearate may contribute to:
Matting
Sanding behavior
Anti-blocking
Water repellency
Powder flow
Pigment dispersion
Compatibility, gloss, viscosity and adhesion must be tested in the final formulation.
Calcium Stearate can coat powder particles and reduce cohesion. This may improve flow in selected industrial powders, agricultural formulations and other dry blends.
Regulated feed or food applications require an appropriate compliant grade.
Not automatically.
Calcium salts of fatty acids may be permitted in specific food, feed, pharmaceutical and cosmetic applications. However, industrial-grade Calcium Stearate does not become food grade or pharmaceutical grade merely because it has the same CAS number.
A regulated grade may require controls for:
Fatty-acid source
Stearic and palmitic acid composition
Heavy metals
Arsenic
Lead
Microbiology
Unsaponifiable matter
Residual solvents
Manufacturing hygiene
Allergen or GMO status
Traceability
Applicable pharmacopoeia or food-additive standards
Use AOZUN’s standard industrial grade only for the applications stated in its commercial documentation.
Food, feed, cosmetic or pharmaceutical use must be confirmed in writing before purchase.
The chemical name alone does not determine source status.
The fatty acids used to manufacture Calcium Stearate may come from:
Vegetable oils
Animal-derived fats
A blend of different sources
A vegetable-derived product may be suitable for vegan requirements, but suitability should be supported by supply-chain documentation.
Halal, Kosher, vegan, RSPO, GMO or allergen claims require the appropriate grade and current certificate. They should not be inferred from appearance or CAS number.
Product | Water behavior | Typical strengths | Selection considerations |
Calcium Stearate | Practically insoluble | Acid scavenging, lubrication, release and hydrophobicity | Widely used in polymers and construction |
Zinc Stearate | Practically insoluble | Strong release, slip and lubrication | Can affect PVC color stability if poorly balanced |
Magnesium Stearate | Practically insoluble | Lubrication, anti-caking and tablet processing | Pharmaceutical use requires compliant grade |
Sodium Stearate | More water-compatible | Thickening, soap and emulsification | Different water behavior from Calcium Stearate |
Aluminum Stearate | Water-insoluble | Thickening, water repellency and gel formation | Rheology differs significantly |
These materials are not interchangeable on a one-for-one basis.
Prioritize:
Calcium content
Free acid
Moisture
Stable melting behavior
Good dispersion
Prioritize:
Low filtration index
Fine and controlled particle size
Low inorganic residue
Low moisture
Consistent color
Prioritize:
Lubrication balance
Fusion behavior
Thermal color
Compatibility with the stabilizer package
Plate-out performance
Prioritize:
Hydrophobic performance
Dispersibility in dry mix
Bulk density
Water absorption
Effect on strength and setting
Prioritize:
Mold release
Filler dispersion
Cure compatibility
Surface quality
Low contamination
Prioritize:
Regulatory compliance
Fatty-acid source
Purity and trace metals
Manufacturing controls
Required certificates
Pharmacopoeia or food-additive specifications
Do not substitute an industrial grade for a regulated grade.
Elemental calcium can be measured by complexometric titration, ICP or another validated method.
The result must be distinguished from CaO or total-ash reporting.
Free fatty acid is normally measured by titration and reported using an agreed calculation basis.
The method and reference fatty acid should be stated if the value is critical.
The drying temperature and duration affect the result. Buyers comparing multiple suppliers should use equivalent test methods.
Particle size may be reported by:
Sieve analysis
Laser diffraction
Microscopy
Percentage through a specified mesh
Results from different methods are not directly interchangeable.
The test should distinguish loose bulk density from tapped bulk density. Feeder calibration should use the value relevant to the customer’s equipment.
Ash reflects the inorganic calcium-containing residue after ignition. It is not the same as elemental calcium.
For high-quality PE and PP film or fiber production, filtration index can be more informative than general purity because it evaluates the material’s effect on fine extruder screen packs.
AOZUN provides a clear industrial specification covering appearance, calcium, free acid, loss on drying and melting range.
Buyers can discuss the target resin, construction formulation, product form and processing requirements before confirming an order.
Available documentation may include:
Batch certificate of analysis
Safety data sheet
Technical data sheet
Packaging information
Country-of-origin information
Regulatory statements where applicable
Standard packaging is a 20 kg woven bag lined with high-pressure polyethylene film. Alternative packaging may be discussed according to quantity and destination.
AOZUN can coordinate export documentation and logistics information with the customer and shipping provider.
Standard packaging:
20 kg PE-lined woven bag
Alternative packaging subject to confirmation
Store Calcium Stearate:
In a cool, dry and ventilated location
In tightly closed original packaging
Away from moisture
Away from direct sunlight
Away from strong oxidizing agents
Away from ignition sources
Where dust accumulation can be controlled
Partially used bags should be resealed promptly to reduce moisture uptake and contamination.
Shelf life must be confirmed from the quotation, product label or commercial documentation.
Calcium Stearate is generally considered a low-acute-hazard industrial material, but powder handling still requires appropriate controls.
Airborne dust may cause mechanical irritation and nuisance exposure. Finely dispersed Calcium Stearate can also form combustible dust concentrations in air.
Recommended controls include:
Local exhaust ventilation
Enclosed powder transfer where practical
Dust collection
Prevention of dust accumulation
Grounding of relevant equipment
Suitable eye protection
Protective gloves and clothing
Appropriate respiratory protection when required
No smoking or open flames in powder-handling areas
Burning material may produce irritating fumes.
Follow the current AOZUN SDS and the customer’s workplace risk assessment.
Calcium Stearate is commonly transported as a non-dangerous good, but the current SDS for the actual supplied grade must control classification.
Before purchase, buyers should confirm:
Applicable chemical inventory status
REACH or TSCA requirements
RoHS requirements
Food-contact requirements
Automotive or electrical specifications
Packaging and labeling rules
Country-specific import documentation
Food, feed, cosmetic and pharmaceutical regulations must be assessed separately from general industrial chemical regulations.
For a faster quotation, provide:
Product: Calcium Stearate
CAS number: 1592-23-0
Required calcium content
Maximum free acid
Maximum moisture
Particle-size requirement
Bulk-density requirement
Required product form
Intended application
Required quantity
Packaging preference
Destination
Required certificates
Delivery schedule
For film, fiber or high-performance polymer applications, include any filtration-index or screen-pack requirements.
The CAS number is 1592-23-0.
No. It is practically insoluble in water, unlike sodium or potassium stearate.
Ideal calcium distearate contains approximately 6.6% elemental calcium. Commercial specifications vary with composition and test method.
A value near 9% may refer to CaO equivalent or ash rather than elemental calcium. Confirm the reporting basis before comparing products.
It is used as a lubricant, mold-release agent, acid scavenger, flow aid and component of selected stabilizer systems.
It can be a component of calcium-zinc or other PVC stabilization systems, but it should not automatically be treated as a complete stabilizer when used alone.
It can reduce water absorption in selected cementitious materials. The effect on strength, air and setting must also be tested.
It is a grade designed to minimize pressure buildup and deposits on fine extrusion screen packs, particularly in PE and PP film and fiber production.
Only a product manufactured and documented to an applicable food specification should be described as food grade. AOZUN’s standard industrial specification does not automatically establish food compliance.
It may be manufactured from vegetable- or animal-derived fatty acids. Vegan status requires source documentation.
It generally has low acute toxicity, but powder can cause mechanical irritation and may form combustible dust concentrations in air.
Standard packaging is a 20 kg PE-lined woven bag. Alternative packaging can be discussed during quotation.
Available documents may include a batch COA, SDS, TDS, packaging data and relevant regulatory statements. Confirm requirements before ordering.
AOZUN supplies Calcium Stearate CAS 1592-23-0 for plastics, coatings, rubber, masterbatch and construction applications.
Send us your required calcium content, free acid, moisture, particle size, quantity, packaging and destination. AOZUN will review the specification, documentation and delivery requirements before providing a quotation.
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