Understanding Hot Melt Adhesive TDS, SDS and COA: A Buyer’s Guide

When sourcing industrial hot melt adhesives, buyers are often sent three documents: a Technical Data Sheet, a Safety Data Sheet, and a Certificate of Analysis. They may look similar, but they answer very different questions.

A TDS explains how the adhesive is expected to perform. An SDS explains how to handle it safely. A COA reports whether a specific production batch meets selected quality requirements.

Understanding hot melt adhesive TDS, SDS and COA documents helps purchasing, production, quality and safety teams avoid incorrect product comparisons, unsuitable processing conditions and inconsistent incoming materials.

This guide explains how to read each document, which values matter most, how to compare information across documents and what buyers should request before approving a bulk adhesive order.

Hot Melt Adhesive TDS, SDS and COA: The Quick Difference

The three documents should be used together.

The TDS helps determine whether the adhesive may fit the application. The SDS helps determine whether it can be stored, transported and used safely. The COA helps confirm that the delivered batch meets the agreed release requirements.

None of these documents alone proves that an adhesive will work on your actual production line.

Why Adhesive Documentation Matters to Buyers

Industrial hot melt adhesive is not a single standardized material. Different types of hot melt adhesives can have very different processing windows, bonding mechanisms and end-use performance.

Even two adhesives described as “EVA packaging hot melt” may differ in:

• Viscosity
• Application temperature
• Open time
• Set speed
• Softening point
• Thermal stability
• Substrate compatibility
• Heat and cold resistance
• Color and odor
• Recommended storage conditions

If buyers compare only price per kilogram, they may overlook differences that affect adhesive consumption, line speed, nozzle performance, bond failure and equipment maintenance.

A proper document review allows buyers to answer four important questions:

1. Is this the correct adhesive grade for our materials and equipment?
2. Can it be handled and stored safely in our market?
3. Does the delivered batch meet the agreed specification?
4. What still needs to be verified through production testing?

What Is an Adhesive Technical Data Sheet?

An adhesive Technical Data Sheet, commonly called a TDS, describes the product’s technical characteristics and recommended use.

Unlike an SDS, the layout of an adhesive technical data sheet is not globally standardized. The information and level of detail can vary significantly between manufacturers.

A useful hot melt adhesive TDS should normally identify:

• Product name and grade
• Adhesive chemistry
• Product form and appearance
• Recommended applications
• Suitable substrates
• Recommended application temperature
• Melt viscosity
• Softening point
• Open time or set time
• Density or specific gravity
• Heat and cold performance
• Storage conditions
• Shelf life
• Cleaning or equipment-change guidance
• Document revision date

TDS Values Are Often Typical Values

One of the most important points for buyers is that many TDS values are typical values, not guaranteed batch limits.

For example, a TDS may state:

Viscosity: approximately 2,500 mPa·s at 160°C

This tells the engineer how the product generally behaves. It does not automatically mean every batch is guaranteed to measure exactly 2,500 mPa·s.

If viscosity is critical to your coating weight, spray pattern or nozzle performance, request an agreed specification range, such as:

Viscosity specification: 2,000–3,000 mPa·s at 160°C

The COA can then report the actual result for the supplied batch.

Typical Value vs Specification vs Actual Result

The figures above are illustrative only. Actual ranges must be agreed for the selected adhesive grade.

A common purchasing mistake is treating every number on the TDS as a guaranteed specification. Before approving a product, ask the supplier which values are controlled release specifications and which are provided only as general technical guidance.

How to Read the Most Important TDS Parameters

1. Adhesive Chemistry

The TDS should clearly indicate whether the adhesive is based on EVA, polyolefin, APAO, PSA, PUR, polyamide, polyester or another chemistry.

Adhesive chemistry affects processing, storage, application and final performance. A vague description such as “industrial hot melt glue” is not enough for technical approval.

2. Appearance and Product Form

The TDS may describe the adhesive as pellets, granules, blocks, pillows, cartridges, films or drums.

Appearance can include color, transparency and physical condition. This information helps the receiving team detect contamination, discoloration, moisture damage or delivery of the wrong grade.

3. Melt Viscosity

Melt viscosity affects pumping, coating weight, spray quality, bead formation, substrate wetting and equipment pressure.

A viscosity value is incomplete unless it states the test temperature. The same adhesive may show very different viscosity at 140°C, 160°C and 180°C.

Where viscosity is critical, check:

• Test temperature
• Unit, such as mPa·s or cP
• Test method
• Spindle and speed, when relevant
• Whether the result is typical or specified
• Acceptable production range

ASTM D3236 is commonly used to measure the apparent viscosity of hot melt adhesives. However, results are comparable only when the test conditions are sufficiently aligned.

4. Softening Point

The softening point indicates when a thermoplastic material begins to soften under defined test conditions. It is not automatically the maximum service temperature of the finished bond.

ASTM E28 Ring-and-Ball testing is frequently referenced for resins and similar thermoplastic materials. Buyers should confirm the actual method stated on the TDS or COA.

A higher softening point does not automatically mean better adhesion, greater heat resistance or a higher recommended application temperature. If elevated-temperature performance is important, review the application-specific guidance in this high temperature resistant hot melt adhesive guide.

5. Recommended Application Temperature

Application temperature is the temperature range used to melt and dispense the adhesive at a suitable viscosity.

It is normally higher than the softening point.

Operating below the recommended range can cause:

• Poor flow
• Incomplete substrate wetting
• Weak bonding
• Stringing
• Irregular bead size
• Excessive pump pressure

Operating above the recommended range can cause:

• Oxidation
• Discoloration
• Odor
• Viscosity changes
• Charring
• Filter or nozzle blockage
• Reduced adhesive performance

The TDS range is a starting point. Final tank, hose and nozzle settings should be validated on the buyer’s equipment.

6. Open Time and Set Time

Open time is the available period between adhesive application and joining the substrates. Set time describes how quickly the bond develops enough strength to resist movement or reopening.

These values depend on more than the formulation. They can change with:

• Adhesive temperature
• Coating weight
• Bead size
• Substrate temperature
• Ambient temperature
• Line speed
• Assembly delay
• Compression pressure
• Porosity and thermal conductivity of the substrate

A TDS that gives an open-time number without explaining the test conditions should be treated as preliminary guidance.

7. Heat, Cold and Environmental Resistance

Statements such as “excellent heat resistance” or “good cold resistance” are not enough for technical approval.

Ask how the property was tested:

• What substrates were bonded?
• What adhesive coat weight was used?
• Was the sample under load?
• How long was it exposed?
• Was the result based on peel, shear or visual inspection?
• Was the test performed before or after conditioning?
• For PUR, how long was the adhesive allowed to cure?

Performance labels should always be connected to a defined test method and acceptance criterion.

8. Storage and Shelf Life

The TDS should explain the recommended storage temperature, packaging condition and shelf life.

Storage is especially important for reactive products. PUR hot melt adhesives must be protected from moisture because exposure can start a reaction before the adhesive enters the application system.

Buyers should confirm whether shelf life begins from:

• Manufacturing date
• Packing date
• Shipping date
• Date of delivery

For imported adhesive, the remaining shelf life at arrival is more useful than the original shelf-life claim.

What Is an Adhesive Safety Data Sheet?

An adhesive Safety Data Sheet, or SDS, communicates information about chemical hazards and safe handling.

An SDS is not a technical performance document. It does not prove that the adhesive will bond a particular substrate, run at a certain line speed or pass an end-use durability test.

Under GHS-based systems, the SDS generally follows a 16-section structure.

The exact legal requirements depend on the product classification and destination market. Buyers should request an SDS prepared for the country or region where the adhesive will be imported and used.

“Not Classified as Hazardous” Does Not Mean Risk-Free

Many conventional hot melts are solid at room temperature and may not be classified as hazardous mixtures. However, operators still work with the adhesive at elevated temperatures.

Possible process risks can include:

• Burns from molten adhesive
• Contact with heated tanks, hoses and nozzles
• Fumes from overheating
• Hazardous decomposition products
• Slip hazards from spilled pellets
• Incompatible cleaning procedures
• Moisture reaction risks for certain reactive adhesives

Always review the complete adhesive safety data sheet, especially Sections 4, 7, 8 and 10. Do not rely only on the hazard classification in Section 2.

Check Whether the SDS Matches the Actual Product

Before accepting an SDS, confirm that it matches:

• The commercial product name
• The exact grade or product code
• The manufacturer or responsible supplier
• The destination market
• The required language
• The current formulation
• The most recent revision

A generic SDS titled only “Hot Melt Adhesive” may not be sufficient when several chemically different grades are being supplied.

What Is a Hot Melt Adhesive COA?

A Certificate of Analysis is a quality document linked to a specific lot or batch.

A useful hot melt adhesive COA should include:

• Manufacturer or supplier name
• Product name and grade
• Lot or batch number
• Manufacturing date
• Test or release date
• Tested quality parameters
• Specification or acceptance range
• Actual test result or clear pass/fail result
• Unit of measurement
• Test method, where relevant
• Overall release status
• Authorized approval

Unlike the TDS, which describes the product generally, the COA should refer to the material actually delivered.

What Properties May Appear on a COA?

Depending on the adhesive chemistry and agreed quality plan, a COA may include:

• Appearance
• Color
• Viscosity at a specified temperature
• Softening point
• Density
• Solid content
• Melt flow or related process property
• Open time
• Tack, peel or shear performance
• Moisture content
• Reactive group content
• Other product-specific release tests

Not every TDS property needs to appear on every COA. The COA normally focuses on the characteristics considered critical for batch release.

Buyers should identify the critical-to-quality properties during the sample and approval stage rather than waiting until the first container is ready to ship.

COA vs Certificate of Conformance

A Certificate of Analysis and a Certificate of Conformance are not always the same.

A COA normally provides test items, specifications and results. A Certificate of Conformance may simply state that the product complies with an agreed specification without showing individual results.

Suppliers sometimes use the terms differently. Buyers should therefore evaluate the document’s actual content rather than relying only on its title.

How to Cross-Check TDS, SDS and COA

The documents should not be reviewed separately. Use the following process to identify inconsistencies.

Step 1: Match the Product Identity

The product name and grade on the TDS, SDS, COA, label, packing list and purchase order should match.

A minor naming difference may be an administrative issue, but it should be clarified before production use.

Step 2: Check Document Dates and Revisions

Confirm the revision date of the TDS and SDS. Ask whether any formulation, supplier or manufacturing-process changes have occurred since the sample was approved.

The COA date should correspond to the delivered batch.

Step 3: Compare Test Conditions

Never compare values without checking:

• Temperature
• Unit
• Test method
• Sample conditioning
• Substrate
• Coat weight
• Test speed
• Load
• Cure time

For example, viscosity measured at 160°C cannot be directly compared with viscosity measured at 180°C.

Step 4: Separate Typical Values from Release Limits

Ask the supplier to identify:

• TDS typical values
• Internal manufacturing-control ranges
• Customer-agreed specifications
• COA release results

The COA should be evaluated against the agreed specification, not against an undefined marketing statement.

Step 5: Match the COA to the Delivered Lot

The batch number on the COA should match the number printed on the adhesive packaging.

Do not accept a COA from an earlier sample lot as proof of the quality of a later commercial batch.

Step 6: Review Remaining Shelf Life

Compare the manufacturing date, declared shelf life and expected arrival date. Include warehouse storage time and production scheduling in the calculation.

Step 7: Check Safety and Transport Consistency

The SDS transport classification should be consistent with the shipping documents. If the product name, manufacturer or formulation differs, request clarification before customs declaration or warehouse receipt.

Which Parameters Matter for Different Hot Melt Adhesive Types?

Different adhesive chemistries require different document-review priorities.

For example, EVA hot melt adhesives used on high-speed carton lines may require close control of viscosity and set speed. A polyolefin hot melt adhesive may need additional verification on PP, PE or coated packaging materials.

For pressure-sensitive products, reviewing only softening point and viscosity is insufficient. The TDS should also address tack, peel and shear performance. Buyers evaluating PSA hot melt adhesives should ensure that the test substrate, dwell time and test method are relevant to the final label, tape or hygiene product.

Documents That TDS, SDS and COA Do Not Replace

TDS, SDS and COA are important, but they may not prove compliance with every market or application requirement.

Depending on the product and destination market, buyers may also need:

• REACH-related declarations
• RoHS test reports or declarations
• Food-contact compliance documentation
• Heavy-metal or restricted-substance reports
• VOC or odor test results
• Migration testing
• Halogen declarations
• Packaging compliance information
• Country of origin documentation
• Quality-management certificates
• Customer-specific restricted-substance declarations

An SDS is not a food-contact certificate. A COA is not automatically a migration report. A TDS statement such as “suitable for packaging” does not by itself prove regulatory suitability for direct or indirect food contact.

The required documentation should be defined according to the final application and destination market.

Recommended Approval Process Before Bulk Purchase

1. Define the Application Requirements

Provide the supplier with:

• Substrate materials and coatings
• Application method
• Tank, hose and nozzle temperatures
• Line speed
• Assembly time
• Coat weight or bead size
• Compression conditions
• Final-use temperature
• Moisture or chemical exposure
• Required certifications
• Current adhesive and known problems

2. Review the TDS and SDS

Use the TDS for technical pre-screening and the SDS for safety, storage and regulatory review.

Do not start a production trial until the selected grade and relevant operating conditions are clear.

3. Agree on Critical Quality Parameters

Identify which properties affect your production most. These may include viscosity, color, softening point, open time, tack or moisture content.

Ask which parameters can be shown on the production-batch COA.

4. Test a Representative Sample

Laboratory data cannot reproduce every production condition. Follow a structured process to test hot melt adhesive samples before bulk purchase.

The trial should use:

• Actual substrates
• Production equipment
• Normal line speed
• Real adhesive coat weight
• Normal compression time
• Expected environmental conditions

5. Approve the Grade and Retain a Reference Sample

Record the approved product code, sample batch, equipment settings and trial results. When practical, retain a sealed reference sample for comparison.

6. Add Documentation Requirements to the Purchase Order

The purchase order or quality agreement can specify:

• Approved product grade
• Packaging type
• Minimum remaining shelf life
• Required TDS and SDS revision
• COA requirements
• Critical specification limits
• Batch identification
• Change-notification requirements

7. Perform Incoming Inspection

At receipt, check:

• Packaging integrity
• Product labels
• Batch numbers
• Manufacturing date
• Remaining shelf life
• Appearance
• COA correspondence
• Storage or transport damage

For critical applications, conduct confirmation testing before releasing the batch to production.

Common Documentation Red Flags

Buyers should investigate the following warning signs:

• The TDS does not show a product code or revision date.
• The SDS product name does not match the ordered adhesive.
• The COA is not linked to the delivered batch.
• Viscosity is listed without a test temperature.
• Heat resistance is claimed without a test method.
• Every TDS value is presented as guaranteed without a defined tolerance.
• The COA shows only “Pass” for all items without specifications.
• The supplier cannot explain which values are typical and which are controlled.
• The sample and bulk order use different product grades.
• The SDS is provided in the wrong language or for the wrong destination market.
• The document claims broad regulatory compliance without supporting declarations.
• Shelf life is nearly exhausted by the expected arrival date.
• The supplier changes formulation or raw materials without notification.

A professional supplier should be able to explain the documents, test methods and limitations clearly. Confidential formulation details may be protected, but confidentiality should not prevent the supplier from communicating relevant hazards, processing guidance and agreed quality requirements.

A Practical Document Request Checklist

Before approving a supplier, ask for the following:

Before Sample Testing

• Current product TDS
• Current market-appropriate SDS
• Recommended processing conditions
• Product identification and packaging information
• Available compliance declarations

Before Product Approval

• Sample batch number
• Critical property specification
• Recommended test methods
• Shelf-life statement
• Change-control or notification policy
• Confirmation of available batch documents

Before Bulk Shipment

• Batch-specific COA
• Packing list with lot identification
• Manufacturing date
• Remaining shelf life
• Current SDS
• Required declarations or test reports
• Transport classification, where applicable

Can Good Documents Replace Production Testing?

No.

A TDS can indicate that an adhesive is technically promising. An SDS can help establish safe handling controls. A COA can show that the batch passed selected release tests.

However, successful bonding still depends on:

• Surface condition
• Material variation
• Adhesive temperature
• Coat weight
• Assembly timing
• Compression
• Equipment condition
• Ambient temperature
• Storage
• Final-use exposure

A technically compliant batch may still fail if the approved specification does not cover the property causing the problem or if production conditions have changed.

Documentation reduces sourcing risk, but real-material testing remains essential.

FAQ: Hot Melt Adhesive TDS, SDS and COA

What is the main difference between a TDS and SDS?

A TDS explains the adhesive’s technical properties, recommended applications and processing conditions. An SDS explains chemical hazards, safe handling, PPE, storage and emergency response. The TDS is mainly for product selection and use; the SDS is mainly for safety and compliance.

Is a hot melt adhesive COA the same as a TDS?

No. A TDS describes the product grade and normally contains typical technical values. A COA is linked to a specific production batch and reports selected quality-control results.

Should the COA values be identical to the TDS?

Not necessarily. A TDS may provide typical values, while individual batches are accepted within an agreed specification range. The COA result should fall within that range, but it does not need to equal the TDS typical value exactly.

Does every hot melt adhesive require an SDS?

SDS obligations depend on product classification and the laws of the destination market. Buyers should still request an appropriate SDS so that safety, storage, emergency and transport information can be reviewed.

Does “not classified as hazardous” mean the adhesive is completely safe?

No. Molten hot melt adhesive can cause serious thermal burns, and overheating may generate fumes or decomposition products. Operators must follow the SDS, product instructions and equipment safety procedures.

Can an SDS prove that an adhesive is food-contact compliant?

No. Food-contact suitability normally requires separate declarations or testing based on the applicable market, adhesive formulation and intended contact conditions.

What should a batch-specific COA contain?

It should identify the product grade and batch, show the relevant specification and result, state the unit or test method where appropriate and include an authorized release decision.

Which hot melt adhesive properties should appear on the COA?

This depends on the adhesive and application. Common items include appearance, color, viscosity and softening point. PUR, PSA and other specialized products may require different critical release tests.

What should I do if the COA passes but the adhesive fails in production?

Isolate the affected lot and compare it with the approved sample. Check equipment temperature, coat weight, substrates, storage, assembly timing and environmental conditions. Then review whether the existing specification covers the property related to the failure.

Final Buyer Recommendation

TDS, SDS and COA documents should be treated as a connected verification system.

• Use the TDS to evaluate technical suitability and establish processing conditions.
• Use the SDS to evaluate hazards, storage, PPE, emergency response and transport information.
• Use the COA to confirm the quality status of the delivered production batch.
• Use production testing to confirm that the adhesive works with your actual materials, equipment and operating conditions.

Before placing a bulk order, make sure the product identity matches across all documents, distinguish typical values from guaranteed specifications and agree on the critical batch-release parameters.

If you need help comparing hot melt adhesive grades or confirming which documents are available for your application and destination market, contact KAISUN with your substrate, equipment, temperature, line speed and performance requirements.