Barium Stearate BaSt₂ Barium Distearate CAS 6865-35-6

Barium Stearate is a metal stearate used mainly in PVC processing, where it serves as a heat-stabilizer component and processing additive. For PVC compounders, the practical question is not simply whether a material is called barium stearate; barium content, melting point and free fatty acid can make a noticeable difference when the product enters a stabilizer package. Tree Chem supplies Barium Stearate CAS 6865-35-6 in Grade I, Grade II and Grade III, giving customers a choice between tighter specifications and more economical general-purpose grades. We also supply zinc stearate and related metal stearates for customers producing combined stabilizer systems.

For specifications, grade selection or formulation discussions, contact info@cntreechem.com.

Specification

Basic Information

Technical Specification

Key Applications

PVC Heat Stabilizer Systems

• PVC processing is the main application for Tree Chem Barium Stearate. PVC is sensitive to prolonged exposure to processing temperatures, so stabilizer systems are introduced to help the compound withstand extrusion, calendaring and other thermal processing stages.
• Barium stearate is commonly used as one component of these stabilizer systems rather than being considered in isolation. Its performance has to be viewed together with the PVC resin, plasticizer system, other metal soaps, lubricants and the processing temperature of the finished compound.
• This is also why PVC customers tend to look beyond the product name when qualifying a supplier. A batch with a substantially different barium content, melting behavior or free fatty acid level can change the way a familiar stabilizer formulation behaves. For plants running established recipes, raw-material consistency is often more useful than repeatedly adjusting the formulation around incoming material variation.
• Tree Chem offers three specifications so that customers do not have to use the same grade for every PVC formulation. Grade I provides tighter control for customers with demanding processing requirements, while Grade II and Grade III provide alternatives for applications with different performance and cost targets.

Barium Stearate and Zinc Stearate Combined Stabilizers

• A particularly relevant application is the use of Barium Stearate together with Zinc Stearate.
• The two metal stearates perform different roles within a combined stabilizer system, which is why PVC formulators often purchase them as related raw materials. Their ratio and the remainder of the additive package are adjusted according to the PVC formulation and the required processing behavior.
• Tree Chem can supply both components. This is useful for customers who would rather discuss the Ba/Zn system with one technical and commercial team instead of qualifying unrelated suppliers separately for each metal stearate.
• From a purchasing standpoint, this can also make specification matching easier. The customer can provide the intended application, current formulation requirements and target specifications, and the discussion can cover both barium stearate and zinc stearate rather than stopping at a quotation for one material.

Ba/Ca/Zn Combined Stabilizer Systems

• Some customers work with more complex Ba/Ca/Zn systems, combining barium, calcium and zinc components to obtain the balance required by their PVC formulation.
• In this type of application, the individual quality of each metal stearate still matters. The formulation is built from several components, so variation introduced by one raw material can affect the behavior of the complete package.
• Tree Chem has production and supply capability for the related metal stearates and can work with customers who purchase multiple components for their stabilizer formulation. This is particularly useful when the customer wants coordinated specifications and technical communication for a compound stabilizer project.
• The exact formulation should always be determined from the PVC resin, plasticizer package, processing equipment, thermal history and finished-product requirements rather than from a universal Ba/Ca/Zn ratio.

PVC Processing and Lubrication Support

• Besides its role in heat-stabilizer packages, barium stearate can contribute to the processing characteristics of PVC compounds because metal stearates also interact with lubrication and melt-processing behavior.
• This does not mean that barium stearate should simply be treated as a general lubricant. Its actual contribution depends heavily on the complete formulation.
• For this reason, a compounder replacing an existing grade should normally run a formulation trial rather than assuming that two barium stearates with similar assay values will behave identically.

Three Specifications PVC Buyers Should Check

Barium Content

• Barium content is one of the clearest indicators when comparing different barium stearate grades.

Tree Chem specifications are:

Grade I: 20.5 ± 0.4%

Grade II: 20.5 ± 0.7%

Grade III: 20.0 ± 1.5%

Grade I therefore provides the narrowest specified range.

• For a customer running a controlled stabilizer formulation, the tighter range can be valuable because the amount and consistency of the metal soap entering the formulation are easier to manage from batch to batch.

Melting Point

• Melting point deserves attention because barium stearate is being introduced into a system that will undergo thermal processing.

Tree Chem specifies:

Grade I: ≥210°C

Grade II: ≥205°C

Grade III: ≥200°C

• This distinction gives PVC customers another practical basis for selecting a grade instead of relying only on price or barium percentage.

Free Fatty Acid

• Residual free fatty acid is another parameter worth checking when comparing barium stearate sources.

The specification becomes progressively tighter from Grade III to Grade I:

Grade I: ≤0.5%

Grade II: ≤0.8%

Grade III: ≤1.0%

• For customers trying to keep an established formulation consistent, tighter control of free fatty acid reduces one source of raw-material variation.

How to Select the Right Grade

• Grade I — For Tighter Raw-Material Control

Grade I is the first grade to consider when the customer places greater emphasis on specification consistency.

It combines:

1. Barium content of 20.5 ± 0.4%
2. Melting point of ≥210°C
3. Loss on heating of ≤0.5%
4. Free fatty acid of ≤0.5%
5. 75 μm residue of ≤0.5%

The narrower barium range and tighter free-fatty-acid limit distinguish it clearly from the general qualified grade.

For PVC stabilizer manufacturers with established formulations or customers who want better control over incoming raw materials, Grade I is usually the logical grade to evaluate first.

• Grade II — The Middle Specification

Grade II maintains 20.5% nominal barium content but allows a somewhat wider barium range and free-fatty-acid specification than Grade I.

It can be considered when the customer’s formulation does not require the tightest Grade I limits but still calls for stronger controls than Grade III.

• Grade III — General Qualified Grade

Grade III is the more general specification, with:

1. Barium content of 20.0 ± 1.5%
2. Melting point of ≥200°C
3. Loss on heating of ≤1.0%
4. Free fatty acid of ≤1.0%
5. 75 μm residue of ≤1.0%

It can be suitable where the formulation has greater tolerance for raw-material variation and purchasing economics are an important consideration.

The key point is that Tree Chem is not limited to Grade III. Customers requiring tighter specifications can select Grade I rather than trying to use a general-purpose grade in a more demanding formulation.

Grade I vs. Grade II vs. Grade III

Barium Stearate in Combined Metal Stearate Systems

The formulation ratio is application-dependent. Tree Chem does not recommend treating a fixed Ba/Zn or Ba/Ca/Zn ratio as suitable for every PVC compound.

Common Purchasing Mistakes

Buying Only by Barium Content

• Barium content matters, but it is not the only meaningful specification. Two products may show similar barium values while differing in melting point, free fatty acid, loss on heating or particle residue.
• For PVC stabilizer applications, these differences should be reviewed before a supplier is approved.

Treating Every Barium Stearate Grade as Equivalent

• Grade I and Grade III are not simply different labels for the same specification.
• For example, Tree Chem Grade I specifies 20.5 ± 0.4% barium and ≥210°C melting point, whereas Grade III specifies 20.0 ± 1.5% barium and ≥200°C melting point.
• A buyer should therefore select the grade around the formulation rather than automatically purchasing whichever quotation has the lowest price per ton.

Evaluating Ba/Zn Components Separately

• When barium stearate and zinc stearate will ultimately be used together, purchasing them as completely unrelated materials can overlook how the customer intends to formulate the stabilizer.
• Providing the application information to the supplier makes specification discussions much more useful.

Changing Grade Without a PVC Trial

• A specification sheet helps narrow the choice, but it cannot reproduce the customer’s complete PVC formulation and processing line.
• When moving from one grade or supplier to another, laboratory or production-line verification should be performed before full-scale replacement.

Frequently Asked by PVC Stabilizer Buyers

Which Tree Chem Barium Stearate grade has the tightest specification?

• Grade I. It specifies barium at 20.5 ± 0.4%, a melting point of at least 210°C and free fatty acid at no more than 0.5%.

Do you only supply general Grade III Barium Stearate?

• No. Tree Chem supplies Grade I, Grade II and Grade III. Customers requiring tighter barium-content and free-fatty-acid control can evaluate Grade I.

Can I purchase Barium Stearate and Zinc Stearate together?

• Yes. Tree Chem can supply both products for customers working with Ba/Zn stabilizer formulations. This also allows the customer to discuss the related specifications and application requirements with the same team.

What about Ba/Ca/Zn stabilizer formulations?

• Tree Chem can also support customers purchasing related metal stearates for Ba/Ca/Zn systems. The actual combination and addition levels should be determined according to the customer’s PVC formulation and processing requirements.

What should I compare when qualifying a Barium Stearate supplier?

• For PVC applications, start with barium content, melting point and free fatty acid. Loss on heating and particle residue are also useful when comparing grades and incoming-material specifications.

Storage & Handling

• Store in a cool, dry and well-ventilated warehouse.
• Keep bags sealed to minimize moisture uptake and contamination.
• Keep away from incompatible materials and unnecessary heat exposure.
• Use clean, dry conveying and weighing equipment.
• Control dust during transfer and follow the applicable SDS and workplace procedures.

Usage Notice

• Barium Stearate grade and dosage should be selected according to the complete PVC formulation rather than a single specification value. When it is used with zinc stearate, calcium stearate or other stabilizer components, compatibility and processing performance should be verified under the customer’s actual formulation and production conditions.
• Customers developing or adjusting Ba/Zn or Ba/Ca/Zn stabilizer systems can provide their target application and raw-material requirements to Tree Chem for further technical discussion.

Packaging

• 20 kg per bag
• 400 kg per jumbo bag
• Custom packaging available upon customer request