Activated Carbon Purchase Specification: What Buyers Should Put on a PO
POWDER FORMPACParticle data, liquid-treatment duty and downstream separation
OTHER SPECIFIED FORMSSpecialtyAgree the actual product grade and application-specific acceptance criteria
An activated carbon purchase order should define more than “activated carbon,” “GAC” or “PAC.” Buyers should identify the application, carbon form, particle size or mesh, required test data, quantity, packaging, destination and document requirements before comparing quotations.
This guide explains the commercial and technical fields commonly used when preparing an activated carbon RFQ or purchase specification. It also shows which properties require application context rather than being treated as universal quality indicators.
Quick Answer: What Should an Activated Carbon Purchase Specification Include?
At minimum, an activated carbon purchase specification should identify the product form, particle size or mesh, application, target contaminant, required quantity, packaging and destination. Where technical comparison is required, also define the applicable iodine value, hardness or abrasion requirement, ash, moisture, density, adsorption test or other performance data using the relevant test method.
Swipe horizontally to review complete specification columns →
| Specification Area | What to Define | Why It Matters |
|---|---|---|
| Product Form | GAC, PAC, pellet/extruded carbon or confirmed specialty form | Separates physically different product families |
| Raw Material Direction | Coconut shell, coal-based, wood-based or other confirmed basis if required | May influence pore structure, ash, hardness and application suitability |
| Particle Size | Mesh range, powder specification or pellet diameter | Affects pressure drop, contact, filtration and handling |
| Adsorption Data | Iodine number, methylene blue, CTC or application-specific data where relevant | Useful only when the metric matches the application |
| Mechanical Data | Hardness, abrasion or attrition where relevant | Important for fixed beds and handling |
| Ash / Moisture | Applicable specification and test basis | Used in quality comparison and handling review |
| Quantity | Required shipment quantity | Required for price and packaging basis |
| Packaging | Bag, big bag, drum, palletizing or agreed export packing | Affects handling and shipment |
| Documents | TDS, SDS, COA and packing information | Supports technical and purchasing approval |
Define the Activated Carbon Form and Product Direction
The first purchasing decision is the physical carbon form. GAC, PAC and other activated carbon forms are not interchangeable simply because they share the same material name.
A. Granular Activated Carbon
Use for fixed-bed adsorption, filtration systems and gas or liquid treatment beds where media retention and pressure drop matter.
RFQ data: mesh range, hardness/abrasion if relevant, iodine or application-specific data, bulk density if required, quantity and packaging.
B. Powder Activated Carbon
Use for batch or dosed liquid treatment, decolorization and impurity adsorption followed by separation.
RFQ data: particle-size specification, application liquid, dosage basis if known, contact time, separation method, quantity and packaging.
C. Specialty / Other Forms
Pellet, extruded, impregnated or other specialty carbons should be specified by the actual application and confirmed product data. Do not substitute them from GAC or PAC terminology alone.
Specify Particle Size or Mesh Correctly
Particle size is both a technical and commercial specification. For fixed beds it can affect pressure drop, mass transfer, fines and bed retention. For powder carbon it affects dispersion, filtration and handling.
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| Particle Specification | What Buyers Should Confirm |
|---|---|
| GAC Mesh Range | Use the required mesh or particle-size range from the equipment, process or existing specification |
| PAC Particle Size | Use the applicable powder specification or test basis rather than only “fine powder” |
| Pellet Diameter | If pellet/extruded product is required, define actual diameter or product reference |
| Fines | Confirm whether fines or dust limits matter |
| Uniformity | Use applicable sieve analysis or particle distribution if required |
| Existing Equipment | For replacement beds, confirm current mesh, support screen and pressure-drop condition |
Which Activated Carbon Properties Should Buyers Compare?
Activated carbon specifications contain many numbers, but no single parameter describes performance in every application. Prioritize the data relevant to the actual treatment target.
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| Property | What It Indicates | Purchasing Caution |
|---|---|---|
| Iodine Number | A common indicator related to micropore adsorption capacity | Do not treat it as a universal predictor for all contaminants |
| Methylene Blue | Information related to adsorption of larger molecules in some applications | Test method and application context must be comparable |
| CTC Activity | Used in certain gas-phase carbon comparisons | Not required for every liquid or water-treatment purchase |
| Hardness | Resistance to mechanical breakdown | Test method and required level depend on application |
| Abrasion / Attrition | Tendency to generate fines | Important where dust and media loss are concerns |
| Ash | Non-carbon mineral residue | Interpret with raw material and application requirements |
| Moisture | Product moisture at test / delivery basis | Can affect shipment weight and comparison |
| Bulk / Apparent Density | Mass per unit volume under applicable test basis | Useful for vessel filling and logistics calculations |
| pH | Relevant in selected liquid-treatment applications | Not a universal activated-carbon quality ranking |
Application Data Needed for Product Selection
If the exact activated carbon grade is not already specified, the quotation should include enough process information to identify the correct carbon direction.
For Liquid Treatment
- Water / process liquid type
- Target color, odor or contaminant
- Feed concentration if known
- Required outlet target
- Flow or batch volume
- Contact time if known
- pH if relevant
- Temperature
- Existing carbon / dosage
- Separation / filtration method
For Gas / Vapor Treatment
- Gas composition
- Target VOC / odor / contaminant
- Inlet concentration if known
- Flow rate
- Temperature and pressure
- Relative humidity / moisture condition
- Bed dimensions
- Existing carbon / mesh
- Required outlet condition
For replacement fixed beds, also send the existing carbon grade, mesh, filling quantity, vessel dimensions, pressure drop and current breakthrough or performance issue.
Documents and Commercial Information to Confirm
Swipe horizontally to review complete specification columns →
| Item | What to Confirm |
|---|---|
| TDS | Applicable grade data, test methods and typical / specification values |
| SDS | Handling, storage and safety information |
| COA | Batch or lot release data where required |
| Packing Information | Package type, net weight, liner, palletizing and labels |
| Sample | Availability, quantity and destination if evaluation is required |
| Quantity | Trial, sample, partial shipment or bulk quantity |
| Destination | Country, city or port required for quotation / freight basis |
| Trade Term | EXW, FOB, CIF, DDP or another agreed basis only where applicable |
TDS, SDS and COA for Adsorbents → Adsorbent Packaging and Export Guide →
Activated Carbon PO / RFQ Checklist
Swipe horizontally to review complete specification columns →
| Specification | Available? | Value / Requirement |
|---|---|---|
| A. Product Definition | ||
| Activated carbon form; Raw material direction if required; Grade / reference; GAC mesh / PAC particle size / pellet diameter; Existing product if replacement | □ | |
| B. Technical Properties | ||
| Iodine number; Methylene blue; CTC activity; Hardness; Abrasion / attrition; Ash; Moisture; Bulk / apparent density; pH; Other application-specific test data | □ | |
| C. Application | ||
| Liquid / gas phase; Process medium; Target contaminant; Feed concentration; Required outlet target; Flow / treatment volume; Temperature; Pressure; Existing dosage / filling quantity | □ | |
| D. Commercial | ||
| Required quantity; Sample requirement; Packaging; Palletizing requirement; Destination country; Trade term if known | □ | |
| E. Documents | ||
| TDS; SDS; COA; Packing information; Applicable export documents | □ | |
Minimum data for a price-first inquiry: Product form + mesh/particle specification + quantity + packaging + destination.
Minimum data for product selection: Application + target contaminant + operating data + required result + quantity + destination.
Common Activated Carbon Purchasing Mistakes
Buying by iodine number alone
A higher iodine number does not automatically make one carbon better for every contaminant or process.
Not specifying GAC mesh
Different mesh ranges can change pressure drop, contact behavior, fines and compatibility with the existing bed.
Treating GAC and PAC as interchangeable
They are used differently and require different handling, equipment and separation methods.
Ignoring test methods
Values from different test methods or reporting bases may not be directly comparable.
Ignoring raw material direction when it matters
Coconut shell, coal-based, wood-based and specialty carbons can differ in pore distribution, strength, ash and application fit.
Leaving packaging and destination until the end
Export packaging and freight basis affect the commercial quotation and handling plan.
Requesting a “same replacement” without old data
For existing beds, send the current grade, mesh, filling quantity, vessel information and operating problem before approval.
Frequently Asked Questions
What should be included in an activated carbon purchase specification?
Define the activated carbon form, particle size or mesh, application, required quantity, packaging and destination. Add relevant technical properties and document requirements when comparison or approval is needed.
Is iodine number the most important activated carbon specification?
Not for every application. Iodine number is useful for certain comparisons, but target molecule size, pore structure, test method and process conditions also matter.
How should GAC particle size be specified?
Use the required mesh or particle-size range based on the process, equipment, pressure-drop condition and existing bed specification.
What is the difference between GAC and PAC in a purchase order?
GAC is normally specified by granular mesh and fixed-bed requirements, while PAC is normally specified by powder particle data, liquid-treatment duty, dosage and separation method.
Should raw material be specified?
Specify coconut shell, coal-based, wood-based or another raw-material direction when it is technically or commercially important.
Which documents should be requested?
Depending on the project, request the applicable TDS, SDS, COA, packing information and required export documents.
What should I send for a replacement carbon bed?
Send the existing carbon grade, mesh, filling quantity, vessel dimensions, process conditions, pressure drop, current performance and replacement reason.
Can Adsorbent Source review an existing activated carbon TDS?
Yes. Send the existing TDS together with the application, target contaminant, particle size, quantity and operating information.
Related Adsorbent Source Resources
Activated Carbon Selection
GAC vs PAC Activated Carbon →
Carbon Molecular Sieve vs Activated Carbon →
Water Treatment Adsorbents →
Carbon Adsorbents → · Activated Carbon → · Granular Activated Carbon → · Powder Activated Carbon →
Send Your Activated Carbon Purchase Specification
Send the activated carbon form, particle size or mesh, application, target contaminant, required test data, quantity, packaging and destination. Adsorbent Source will review the quotation basis, available technical documents and product direction according to the confirmed purchasing requirement.
For comparing carbon offers on grade, test method, packaging and delivery basis, review How to Compare Adsorbent Supplier Quotations.
For an existing carbon-bed replacement, connect the purchase specification with the Activated Carbon Replacement Specification before final approval.
For a complete activated carbon purchase review, compare the purchase specification with the Activated Carbon Bulk Density and Loading Guide.
Before approving a bulk activated carbon purchase, connect the purchase specification with the Activated Carbon Sample Evaluation Checklist.