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Grease Formulation · Gellant Qualification

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Technical Specifications for Bentonite Gellants Used in Greases

A useful bentonite gellant specification for lubricating grease has three layers: the identity and consistency of the organoclay powder, its ability to develop structure in the intended base-oil and additive system, and the performance of the finished grease. A powder certificate alone cannot establish grease suitability. Oil chemistry, activation route, dispersion energy, addition sequence and downstream additives can change the result even when two deliveries meet the same basic incoming limits.

For that reason, procurement and formulation teams should agree on both a supplier specification and a controlled application test. The supplier specification protects raw-material consistency; the application test confirms that the gellant produces the required worked penetration, oil retention, mechanical stability and processability in the buyer’s own formulation.

Quick Answer

The most important technical specifications for a bentonite gellant used in grease are material identity, appearance, volatile or moisture content, fineness or residue, bulk density, organophilic treatment consistency, base-oil compatibility, activation requirement, dispersion method and lot traceability. These raw-material controls must be paired with application tests in a fixed reference grease, including unworked and worked penetration, extended worked stability, oil separation, water resistance where relevant, corrosion protection, pumpability or flow, and performance after thermal exposure. The final limits should be set for the intended grease and process rather than copied from an unrelated grade.

What a Bentonite Gellant Is in a Grease Formulation

In this application, the functional material is normally an organophilic clay: bentonite or a related smectite clay whose surface has been modified so it can interact with organic liquids. When the correct grade is adequately wetted, activated where required and dispersed in the base oil, the clay platelets develop a three-dimensional structure that holds oil and gives the formulation grease-like consistency.

This is a non-soap thickening route. The clay network does not melt in the same way as a soap-thickener structure, so clay-thickened greases are commonly described as non-melting or as having no conventional dropping point. That description must not be interpreted as an unlimited operating-temperature claim. Base-oil evaporation and oxidation, additive stability, seal and bearing materials, relubrication interval and the actual equipment environment still determine the usable temperature window.

For the broader application context, see organoclay for grease and organoclay for lubricating grease. This page has a narrower responsibility: defining what should appear in a gellant specification and how those requirements should be verified.

Use a Three-Layer Specification

Specification layer	What it controls	What it cannot prove by itself
Raw gellant specification	Identity, physical condition, powder consistency, traceability and conformity of each supplied lot.	Whether the material develops the target consistency in a particular oil and additive package.
Reference-gel or reference-grease test	Gelling response under a fixed oil, activator, loading, mixing sequence, temperature and shear history.	Full performance in the buyer’s commercial formulation or production equipment.
Finished-grease specification	Consistency, stability, oil release, water response, corrosion protection, load or wear performance and application fit.	Which raw-material variable caused a failure unless process and incoming data are also reviewed.

Keeping these layers separate prevents a common purchasing error: accepting a gellant because its powder properties match a certificate while ignoring whether it is compatible with the intended oil and process. It also prevents the opposite error of rejecting a conforming raw material when the real cause is a change in activator, mixing energy, oil lot, additive sequence or test temperature.

Raw-Material Specifications to Put on the Supplier Document

Specification item	Why grease formulators monitor it	Recommended control approach
Product and material identity	Confirms the ordered organoclay family and prevents substitution between grades intended for different polarity or activation conditions.	Use the exact supplier grade, revision-controlled TDS and purchase specification.
Appearance and color	Flags contamination, abnormal moisture pickup or a visible lot change that may affect light-colored grease.	Define an approved visual description or retained-reference comparison.
Moisture or volatile content	Can affect powder handling, activator balance, wetting and batch-to-batch consistency.	Specify the method, sample conditioning and acceptance range.
Fineness, sieve residue or particle-size control	Influences powder incorporation, agglomerate risk, texture and the energy needed for dispersion.	Use one agreed method; do not compare results produced by different techniques as if they were equivalent.
Bulk density	Affects bag-to-hopper handling, volumetric feeding and dust-management behavior.	Define whether the value is loose, tapped or measured by another stated method.
Loss on ignition or composition-related control	Can support consistency monitoring of the modified clay but is not a direct grease-performance test.	Use only when the supplier has a validated method and stable product history.
Organophilic treatment consistency	Controls interaction with the intended organic medium and is central to gelling response.	Verify through a supplier QC method and a buyer-approved reference-gel test.
Lot number and manufacture date	Connects incoming material, COA, production batches, retained samples and complaint investigation.	Require clear lot identification and batch traceability.
Packaging condition	Damaged or poorly sealed bags can introduce moisture, contamination and handling variation.	Define bag type, net weight, seal condition and storage requirements in the purchase agreement.

The numerical limits should come from the TDS and COA for the selected Camp-Shinning grade and from the buyer’s approved incoming standard. A generic web table should never replace the current product document. Camp-Shinning operates its own bentonite mine and manufacturing plant and uses a complete quality-control system with batch traceability; grade-specific limits should still be confirmed against the document revision supplied for the order.

Compatibility Data Is More Important Than a Universal “Grease Grade” Label

“Suitable for grease” is only a category statement. The technical question is whether the organoclay can be wetted and developed in the actual continuous liquid phase. Mineral oils, polyalphaolefins, esters, vegetable oils, silicone fluids and other synthetic base stocks differ in polarity and solvency. Additives can further change the environment seen by the gellant.

Compatibility input	Information to send the supplier	Why it changes grade selection
Base-oil family	Mineral or synthetic type and supplier designation.	The surface treatment must interact with the liquid phase well enough to develop a network.
Base-oil viscosity	Viscosity grade and measurement temperature.	Changes mixing, wetting, milling, pumping and the final consistency contribution.
Oil blend	Approximate proportions of every base fluid.	A minor polar component can alter activation and structure development.
Additive package	Antioxidant, antiwear, extreme-pressure, corrosion inhibitor and solid-lubricant types.	Additives may compete at clay surfaces, change polarity or affect the measured consistency.
Target grease consistency	Required NLGI grade or worked-penetration window.	Determines the useful screening range and process conditions.
Service requirement	Temperature, speed, load, water exposure, pumping distance and relubrication method.	Defines which finished-grease tests matter; it does not set the gellant specification alone.

A candidate should therefore be screened in the buyer’s base-oil blend before a production approval is issued. If the formulation changes later, particularly the oil family or additive package, the previous gellant approval should be reviewed rather than assumed to remain valid.

Define Activation and Dispersion Requirements Grade by Grade

Some organoclay grades require a polar activator to help separate and develop the clay platelets; other grades are designed for easier direct dispersion or self-activation. The purchase specification should state which route applies. It should not prescribe one activator level, pre-gel method or mixing time for every bentonite gellant.

1. Fix the oil charge. Record the exact oil blend, batch size and starting temperature.
2. Control powder addition. Add the gellant into effective circulation at a repeatable rate and inspect for floating powder or persistent agglomerates.
3. Apply the verified activation route. Where an activator is required, use the confirmed type, concentration, addition point and safety controls for that grade and formulation.
4. Record dispersion energy. Mixer design, speed, time, mill gap and number of passes are more useful than the undefined phrase “high shear.”
5. Control additive sequence. Evaluate whether other grease additives are introduced before or after the gellant network has developed.
6. Use a fixed conditioning period. Compare samples at the same temperature and elapsed time before penetration or rheology testing.
7. Verify scale-up. Match energy per unit volume, circulation pattern, heat history and residence time as closely as practical before approving the plant process.

Incomplete wetting or delamination can make an otherwise suitable gellant appear weak. Excess or poorly controlled activation can also produce an inconsistent result. A dispersion procedure is therefore part of the technical specification, not an informal production note.

Build a Reference-Grease Test for Lot Approval

A reference test converts raw-material consistency into an application-relevant control. The method should be simple enough to repeat but sensitive enough to identify a meaningful change. Keep the following variables fixed for every lot.

Controlled variable	What must be fixed	Failure created by poor control
Reference oil	Oil supplier, grade, lot policy and preconditioning.	An oil change may be misdiagnosed as a gellant change.
Gellant concentration	Weighing basis, balance accuracy and total batch mass.	Small loading differences can distort the apparent gelling response.
Activator	Identity, purity, ratio, addition point and mixing interval where applicable.	Under- or over-activation can mask lot quality.
Mixing and milling	Equipment, geometry, speed, time, temperature, gap and passes.	Different energy input changes platelet development and texture.
Conditioning	Rest time, storage temperature and container.	Samples tested at different maturity can appear inconsistent.
Test method	Penetration or rheology procedure, sample temperature and operator steps.	Method variation can exceed the material variation being measured.
Reference control	Approved lot or retained standard tested beside the new lot.	Long-term instrument or method drift remains invisible.

For incoming control, the primary response may be a fixed-gel viscosity, yield response or penetration result. For production qualification, the same candidate should be tested in the complete commercial grease because a simplified reference oil cannot represent every additive interaction.

Finished-Grease Tests That Complete the Specification

Finished-grease property	Common evaluation direction	Decision supported
Unworked and worked penetration	Use the agreed penetration method and conditioning temperature; ASTM D217 is commonly specified.	Confirms consistency and NLGI classification under the defined method.
Extended worked penetration	Compare consistency before and after prolonged mechanical working.	Shows whether the structure remains acceptably stable under repeated shear.
Oil separation	Use the buyer’s selected static or elevated-temperature separation method, such as an applicable ASTM procedure.	Assesses how effectively the thickener network retains the base oil under the test condition.
Dropping-point behavior	Record the applicable method and report the result correctly for a clay-thickened grease.	Supports thickener classification but does not establish the full service-temperature limit.
Water resistance or washout	Test only when water exposure is relevant to the application.	Checks grease retention under the stated water and temperature condition.
Corrosion protection	Use appropriate steel and copper corrosion methods for the intended equipment and additive package.	Confirms that the complete grease protects the relevant metals; the gellant alone does not provide the whole result.
Wear and load performance	Select a method that represents the application and additive package.	Evaluates the finished lubricant, not merely the bentonite gellant.
Low-temperature flow or pumpability	Test at the expected delivery temperature and equipment geometry.	Confirms whether the grease can reach the lubrication point.
Thermal and storage stability	Compare penetration, oil separation, appearance and oxidation indicators after a defined exposure.	Shows whether the complete formulation stays within its agreed limits over the test program.

Test names are not enough. The specification should include the method revision, sample preparation, temperature, duration, reporting units and acceptance window. Results obtained with different methods or conditioning procedures should not be compared as direct equivalents.

How to Read “No Drop Point” Correctly

Clay-thickened grease does not rely on a soap structure that undergoes a conventional melting transition. This is why supplier and finished-grease documents often use terms such as “non-melting,” “non-drop” or “no dropping point.” The statement describes the thickener system under a specified test; it is not a guarantee that the lubricant remains usable at every temperature.

• The base oil can thin, oxidize or evaporate before the clay structure loses its form.
• Additives may degrade or become depleted during prolonged heat exposure.
• Oil loss can leave a dry clay-rich residue that is not an effective fluid lubricant.
• Bearing speed, load, ventilation, relubrication interval and contamination alter the practical limit.
• Seals, cages and other component materials may have lower temperature ratings than the grease thickener.

Temperature approval must therefore come from the complete grease supplier’s data and equipment validation. Gellant selection is one input to that decision, not the entire decision.

Common Qualification Failures and What to Check

Observed result	Possible cause direction	First controlled check
Reference grease is softer than target	Oil mismatch, incomplete wetting, insufficient activation, lower energy input or weighing variation.	Repeat beside the approved lot using the same oil, activator, mixer, temperature and conditioning time.
High batch-to-batch penetration variation	Variable addition sequence, mill setting, temperature history, activator handling or raw-material feeding.	Audit recorded process variables before changing the gellant loading.
Visible specks or grainy texture	Agglomeration, rapid powder addition, inadequate circulation or insufficient milling.	Inspect the dispersion after each process stage and compare sieve or grind observations.
Acceptable initial consistency but excessive oil separation	Weak developed network, additive interaction, poor dispersion or an unsuitable thickener level.	Compare oil separation and extended worked penetration at matched conditioning.
Grease becomes difficult to pump	Excess structure, inappropriate NLGI target, unsuitable base-oil viscosity or poor low-temperature flow.	Test in the actual delivery temperature and pumping geometry.
Structure changes after additive addition	The additive package alters polarity or competes with the clay surface.	Run a sequence study that adds the package before and after gellant development.
Laboratory result does not scale	Different energy density, circulation, heating rate, mill residence time or order of addition.	Map laboratory and plant process inputs rather than matching mixer speed alone.

For a formulation-centered view of the thickener role, continue to grease thickener. For pages focused on the material in a grease system, see bentonite clay grease and organoclay grease.

Supplier Qualification and Document Checklist

A technical specification should be supported by controlled documents and a clear change process. Before approving a bentonite gellant, request and review the following items for the selected grade.

1. Current technical data sheet with product identity, typical properties and processing direction.
2. Safety data sheet for handling, storage, exposure control and transport review.
3. Lot-specific certificate of analysis tied to the delivered batch.
4. Packaging, storage and shelf-life information for the actual supply format.
5. Statement of the intended base-oil polarity range or application direction.
6. Activation and dispersion instructions that distinguish conventional and easy-dispersing grades.
7. Change-notification expectations for raw material, process, specification or test-method revisions.
8. Retained-sample and batch-traceability route for investigation.
9. Sample quantity sufficient for reference-gel, finished-grease and repeatability testing.

Camp-Shinning provides product recommendation, formula optimization, technical consultation, remote technical support, sample testing and sample requests. TDS, SDS and COA support should be confirmed for the selected material and order. Zhejiang Camp-Shinning New Material Co., Ltd. is an organoclay manufacturer, factory, exporter and OEM supplier founded in 2005, with its own bentonite mine, manufacturing plant and batch-traceability system.

Information to Send for a Gellant Recommendation

Information	Useful detail
Base oil	Type, grade, supplier, viscosity and blend proportions.
Finished grease	Target NLGI grade, penetration window, appearance and intended application.
Performance priorities	Mechanical stability, oil separation, water exposure, temperature, load, speed, pumpability and relubrication interval.
Additives	Antioxidant, antiwear, EP, corrosion inhibitor, tackifier, solid lubricant and other functional components.
Current process	Batch size, equipment, order of addition, temperature, shear, mill type, passes and conditioning time.
Current problem	Soft grease, excessive oil release, grainy texture, inconsistent penetration, weak scale-up or another defined failure.
Test package	Methods, acceptance limits, benchmark, destination market and required documents.

This information allows a supplier to screen the material direction without assuming a universal loading or activation route. Related formulation options can also be reviewed under thickener grease and thixotropic grease.

Frequently Asked Questions

Request Bentonite Gellant Specification Support

Send Camp-Shinning your base-oil details, target grease consistency, additive package, processing route, qualification tests and documentation requirements. The technical team can review the organoclay screening direction and arrange material for controlled laboratory evaluation. Request support for a bentonite gellant used in grease.