Hot Melt Adhesive Pellets & Granules: Selection, Specs, and Buyer Checklist

Hot Melt Adhesive Pellets & Granules are solid thermoplastic adhesive forms sold for melting, feeding and industrial bonding. Buyers need to make selections for their polymer family, apparent viscosity, process temperature, substrate pair and test results before requesting samples.

Answer: pellets and granules can be the correct hot melt adhesive form for you when your line is constructed to melt adhesive in bulk and apply the molten form. They aren’t inherently better than film, web, or powder. Form depends on feeder, melter tank, coating nozzle/head, substrate surface, bond-line configuration and the documentation your customer wants.

• Don’t take the form name literally. pellet, granule, chip and pillow terms can all overlap between different suppliers’ terms and in the internal terms of a customer’s engineering or manufacturing teams.
• Specify the apparent viscosity at the target processing temperature – don’t use only a melting point.
• When considering packaging, keep food contact, recyclability and operator safety as distinct considerations.
• If the customer’s project is with Teng Yang, then this guide can be the basis of your RFQ. Teng Yang’s solutions page will handle custom material or sample requests.

What Hot Melt Adhesive Pellets and Granules Are

A industrial pellet or granule is a solid hot melt form that’s rendered meltable by heating. It’s then generally introduced into a melter, screw, tank, or coating head and dispensed in its melted form. Rather than being dried via evaporation of a solvent, the bond forms and hardens as the adhesive cool and solidifies.

Suppliers don’t have consistent naming conventions. One supplier may offer hot melt adhesive pellets, while another offers hot melt glue pellets, chips, pillows or granules of the same type of hot melt adhesive, applied using bulk melting. Within some adhesive industry operations, personnel may continue to refer to this type of material as hot glue, even if the Purchase Order calls for hot melt. Regardless of name, ensure the supplier provides a form that perform appropriately with your feeder, melter, and application equipment; be specific regarding particle size, softening point, apparent viscosity and test results with your specific substrate and application.

Teng Yang provides hot melt adhesive films, webs, powders and granules across the TPU, EVA, PA, PES and PO polymer families. Ultimately, a customer’s concern isn’t whether a material is supplied as a pellet, but whether it can create a suitable bond on materials such as metal, plastic, paperboard, reflective material, automotive trim, leather, fabric or packaging without causing handling difficulties.

Industrial buyers can get trapped by the form name, because a pellet that feeds cleanly in one line can bridge, char, or under-wet a surface in another line. Teng Yang treats the form name as a starting spec, then checks substrate, temperature, equipment, and document needs before recommending a sample path.

Pellet-to-Process Fit Matrix: Forms, Feeders, and Risks

Form versus process. Pellets and granules are typically used in applications where the line has been designed for bulk melting and the adhesive is applied in a molten form. Film, web, or powder are typically preferred for applications where the adhesive is laid down in a specific layer configuration prior to activation. The chart below isn’t a full guide to approvals; it’s a helpful tool to use when you’re starting the evaluation process for material samples.

Form Type	Likely process	Confirm before buying
Pellet	Bulk tank melting or screw feeding	Particle size, blocking risk, and feeder geometry
Granule	Automatic feed systems and coating lines	Dust, flowability, and hopper bridge risk
Chip	Some packaging and bookbinding systems	Melt rate and tank residue after a shift
Pillow	Larger bulk hot melt glue handling	Melter capacity and operator loading method
Film	Pre-placed lamination layer	Width, thickness, release liner, and activation window
Web	Textile, foam, and non-woven material lamination	Open structure, hand feel, and bleed-through
Powder	Heat-transfer printing and distributed coating	Mesh, scatter control, and post-press cleaning
Bulk hot melt glue	Packaging cases, cartons, and assembly	Nozzle cutoff, stringing, char, and set speed
Custom compound	Application-specific formulation	Additive package, color, hardness, and compliance file

Polymer Selection Ladder: EVA, TPU, PA, PES, and PO

While a polymer name is a great initial filter, it isn’t production approval. Public market data suggests that EVA is the biggest raw material category. For instance, one market report estimates a 37.13% raw-material share for EVA and a 31.72% application share for packaging in its 2026 view. This same report says the hot melt adhesives market will be worth $8.29 billion in 2025, $8.70 billion in 2026 and $12.99 billion by 2034, and estimates it will grow at a 5.20% CAGR, with 47.70% in the Asia Pacific region for 2025. It doesn’t mean EVA will perform best for all packaging application, but rather, for a buyer, it signals that EVA is sufficiently prevalent to be considered during the initial, cost-driven, and generic bonding stages.

Treat that estimated EVA share as market context, not proof of fit; polymer behavior changes with substrate, temperature window, and line speed. Teng Yang screens EVA, TPU, PA, PES, and PO against the application instead of using market share as a shortcut for approval.

TPU, polyamide, co-polyester, and polyolefin are the families of choice if your bonding demands flexibility, temperature resistance, exposure to washing, or bonding to challenging substrates. Information available on PA and PES selection details is less extensive than on EVA and polyolefin, therefore these families should only be evaluated as specialized options until a supplier can demonstrate viability with your substrate, age, and process equipment.

Material Class	Typical buyer reason	Do not assume
EVA	Cost-sensitive packaging, carton sealing, bookbinding, and general assembly screening	That a low-cost adhesive will pass heat aging or difficult plastic bonding
TPU	Textile, footwear, leather, flexible laminate, and durable hand-feel needs	That flexibility alone proves wash or hydrolysis resistance
PA / polyamide	Specialized heat or resistance needs where supplier data supports the choice	That PA is a default pellet choice for all industrial lines
PES / co-polyester	Selected lamination or specialty applications where polyester compatibility matters	That public sources give enough detail for approval without trial data
PO / polyolefin	Packaging, assembly, and some plastic-related bonding screens	That polyolefin removes the need for surface treatment checks
PUR / polyurethane	Higher performance reactive bonding in some markets	That PUR handling, moisture reaction, and storage rules match standard pellets
Biodegradable claim	Sustainability screening where standards and disposal route are defined	That the claim proves recycling, composting, and food-contact status at once
Colored or amber grade	Visual control, brand color limits, or contamination inspection	That color has no effect on heat history or customer approval
Custom formulation	A specific bond, hardness, open time, or application window is required	That a catalog grade can meet every substrate and resistance target

Buyer Terminology Notes

Supplier pages, purchasing records, and maintenance teams may use different names for the same material family. Treat the phrases below as vocabulary to clarify in an RFQ, not as proof that a grade is approved for production.

Phrase a buyer may see	How to verify it before sampling
Bulk hot melt adhesive	Ask whether the supplier means bulk hot melt glue pellets, granules, chips, pillows, or glue sticks. Also state whether the line expects a 5 kg trial pack, 25 kg bag, 55 lb carton, or another pack size.
EVA adhesive	Spell out ethylene vinyl acetate, then confirm whether the EVA is a copolymer grade. An inexpensive packaging grade may not deliver good adhesion on different substrates.
TPU adhesive	Thermoplastic polyurethane grades can suit flexible goods, but porous textiles, leather finishes, UV exposure, and barrier film surfaces still need trial data.
Temperature wording	High temperature and high melt temperature are not substitutes for a measured viscosity curve. If the line runs from 150 C to 175 C, record behavior in the molten state and clarify any drying or curing distinction.
Special chemistry or color	Some PA systems use dimer acid chemistry. Tan pellets may help visual control, but color does not prove binding strength or a linear processing window.
Sustainability claim	Do not claim certified biodegradable to ASTM D6400 or biodegradable to ASTM D6400 standards unless the supplier provides a certificate tied to that exact grade.
Wide application range	A wide application range statement only means the grade is worth screening. It does not replace bond testing, document review, or customer approval.

5-Spec RFQ Checklist for Hot Melt Adhesive Pellets

Your RFQ needs to challenge suppliers to solve the actual production problem. Use this 5-Spec RFQ Checklist for the brief but sufficiently detailed query required for sales and technical professionals.

A quote can look complete and still fail at 175°C when the supplier only sees a polymer name. Put the application temperature, substrate pair, line equipment, and target failure mode in the RFQ so the sample is screened against the actual production risk.

1. Clearly specify both surfaces of the bond. Examples include textile to film, leather to foam, coated paperboard to carton stock, plastic to metal, or reflective material to fabric.
2. Define your existing production equipment and parameters. This should include information on the type of equipment used, such as a melter, nozzle, coating machine, laminator, or heat-press process, and operating temperature if it’s already established.
3. Specify the preferred testing method and associated temperature. For example, while ASTM D3236 is commonly used for determining apparent viscosity, its results under low-shear conditions might not accurately reflect performance at higher shear rates.
4. Clearly articulate the expected failure modes of the bond. This could include issues related to peel strength, shear strength, thermal failure, wash durability, aging performance, appearance defects, stringing, or bleed-through.
5. List required certifications and documents from the outset. Depending on your needs, these might include a Safety Data Sheet (SDS), RoHS and REACH compliance, food-contact approvals, or specific customer declaration forms.

Provide additional details such as color preferences, particle size requirements, packaging format, monthly usage volume, and whether the new material must replace a solvent-based adhesive. If you require samples, please refer to Teng Yang’s available hot melt adhesive pellets and granule options and provide information on your substrate, temperature, thickness, width, and application.

Application Fit Matrix: 10 Buyer Use Cases

The following table help you determine which applications to test first based on buyer considerations, not catalog groupings. Ask suppliers for grades supported by application data once you’ve identified promising test candidates.

Application Type	Likely hot melt adhesive focus	Trial question
Carton and case packaging	Fast set, clean cutoff, open time, char control	Does the bead hold after storage and transport?
Bookbinding	Spine penetration, set speed, flexibility	Does the bond resist cracking after page cycling?
Garment accessories	Hand feel, wash resistance, fabric bleed-through	Does the fabric retain touch and appearance?
No-sew underwear	Soft bond line, stretch recovery, heat-press control	Does the edge lift after wash and stretch?
Footwear	Flex, leather or textile adhesion, heat aging	Does flexing break the bond at the fold line?
Leather lamination	Surface wetting, soft feel, resistance after aging	Does the adhesive mark or stiffen the surface?
Heat transfer printing	Powder or granule compatibility, press temperature, wash behavior	Does the graphic edge stay clean after laundering?
Reflective materials	Adhesion without optical damage	Does bonding reduce reflectivity or create surface defects?
Automotive interiors	Temperature resistance, low odor, foam or fabric bond	Does the adhesive survive cabin heat and trim stress?
Industrial assembly	Mixed substrate bonding, set time, fixture removal	Does the bond fail suddenly under temperature change?

Testing and Documents to Request Before Production

To obtain production approval, you’ll need more than just a data sheet. Insist on seeing the test method used, the temperature it was run at, and its range of applicability. ASTM D3236 can demonstrate apparent viscosity for applications up to 175°C but caution is advised, since apparent viscosity measured at low shear is not necessarily indicative of application at high shear. This nuance is especially relevant when using pumps, extruders, and nozzles.

Use the 175°C D3236 scope as a lab boundary, not a process guarantee; standard hot melt materials cool and set rather than cure like a reactive adhesive.

For Teng Yang sample reviews, the supplier file should connect ISO 10363, ASTM D3236, U.S. food-contact context where relevant, and the exact production application instead of sending a generic data sheet.

Thermal stability is a different concern. ISO 10363 refers to heat aged samples and the testing of viscosity and softening points where skin, fumes, phase separation, gelation and color change may be noted in the time frame from 4 hours to 6 hours. The material that looks fine at start up can result in deposits or color drift due to residence in the melter.

If you plan to use the adhesive in food-contact packaging, avoid a generic “food grade” statement. U.S. 21 CFR Part 170 sets out food additive and food-contact substance pathways, including premarket notifications and threshold-of-regulation exemptions.

Ask what market the documentation addresses: U.S., EU or the specific customer are not interchangeable.

A 2024 packaging migration review points to temperature, contact time and the type of material used in assessing migration risk.

While some laboratory testing contexts mention conditions such as 40°C for 10 days, it’s your regulatory or lab group that should tell you the right condition to evaluate based on your specific situation.

Hidden Bottleneck Map: Lab Specs vs Production Reality

It’s very often that failure to launch isn’t due to the wrong polymer.

It occurs because one buried bottleneck wasn’t considered. Cranking the temperature may reduce the viscosity, but can result in cutoff, string, char, open time, line consistency, etc. Safer bet: Evaluate the adhesive within the real production temperature window.

Buyer rule: A pellet trial can fail because apparent viscosity, substrate wetting, and melter residence time are separate risks. Teng Yang can screen polymer choices, but your production test has to confirm the final bond.

Failure Type	Likely hidden bottleneck	Evidence or check
Weak initial tack	Surface energy or coating on the substrate	Use ASTM D2578-style wetting-tension thinking as a caution, not final proof.
Stringing at cutoff	Temperature, nozzle condition, or viscosity window	Compare the planned line setting with apparent viscosity at temperature.
Char in tank	Residence time and overheating	Use ISO 10363 thermal stability observations over 4 hours to 6 hours intervals.
Edge lift after washing	Wrong polymer or bond-line thickness	Run the actual textile or leather wash and stretch sequence.
Sudden failure in use	Temperature swing or brittle glue line	Forum field reports are only a warning signal; confirm with your load case.
Bleed-through on fabric	Application amount and substrate porosity	Test visual appearance after heat pressing and aging.
Food packaging concern	Migration and substance-level authorization	Use U.S. food-contact checks and customer market rules before scale-up.
PET label recycling concern	Adhesive release during hot caustic washing	APR guidance separates releasing and non-releasing label adhesive behavior.
Worker safety issue	Molten adhesive burn, ventilation, or overheating risk	SafeWork SA notes molten hot melt hazards and recommended operating temperature controls.

For packaging, recyclability isn’t synonymous with food-contact approval. APR’s PET design guide (updated 5/15/26) considers adhesive behavior during hot caustic washing as a design variable.

Releasing adhesive which rinses off of PET is a very different problem than a non-releasing adhesive that remains attached to PET after hot caustic wash.

Don’t forget safety!

Molten hot melt can burn skin or eyes, and can even pose a fire risk when over heated, emitting fumes. Work with the operators on how the material is being introduced, the suitability of the ventilation, and that the equipment is set at an acceptable operating temperature.

FAQ

Are hot melt adhesive pellets and granules the same thing?

Often, yes in buying language. Both usually refer to solid hot melt adhesive forms that are melted before use. Exact shape and feeding behavior still vary, so confirm equipment fit before purchase. Ask for particle size, bag or carton format, and the supplier’s recommended melter setup before approving a sample.

When should a buyer choose pellets or granules instead of film, web, or powder?

Choose pellets or granules when the line already melts adhesive in bulk and applies it through a tank, hose, nozzle, coating head, or screw-fed process. Choose film, web, or powder when the adhesive must be placed as a layer before heat activation, such as textile lamination, heat transfer printing, or a bond line that needs tight thickness control.

What specifications should be sent to a supplier before asking for samples?

Send the substrate pair, production process, operating temperature, target softening or melting point, apparent viscosity target if known, open time or set time target, color, packaging form, and compliance documents needed by the final market. A supplier also need to know the failure mode you’re trying to avoid, such as poor adhesion, stringing, bleed-through, edge lift, or unstable feeding.

Which polymer is better: EVA, TPU, PA, PES, or PO?

There’s no single best polymer. EVA is often screened for cost-sensitive packaging or general bonding. TPU is usually considered when flexibility, textile feel, footwear, or leather bonding matters. PA and PES should be treated as specialized choices unless the supplier has strong data for your substrate and temperature. PO can be useful in selected packaging and assembly work, but low-surface-energy plastics may still need surface treatment or a different formulation. If the part combines foam, coated fabric, ink, or a low-energy film, ask for a small ladder trial rather than a single pellet sample. Keep one control material, one alternate polymer, and one process setting documented so a failed bond can be traced to chemistry, surface condition, or line setup instead of guesswork.

Can pellets or granules replace solvent-based glue?

Sometimes. Confirm melt behavior, adhesion strength, appearance, cleaning impact, heat aging, and process stability first.

What should Teng Yang know before recommending a grade?

Share the material pair, application method, operating temperature, target bond feel, color, width or thickness-related conversion need, expected resistance, and required documents. Shanghai Tengyang New Materials Technology Co., Ltd. can then screen TPU, EVA, PA, PES, and PO hot melt options across film, web, powder, and granule formats instead of guessing from the keyword alone.

Sources Used for This Guide

• ASTM D3236-15(2021) for apparent viscosity scope and caveat.
• ISO 10363:1992 for thermal stability testing context.
• Fortune Business Insights hot melt adhesives market report for directional market-share and market-size context.
• eCFR 21 CFR Part 170 for the U.S. food additive and food-contact substance framework.
• 2024 packaging migration review in PubMed Central for migration-risk context.
• AJ Adhesives temperature-control article for process-temperature risk framing.
• APR PET design guide for label adhesive recyclability context.
• SafeWork SA adhesive safety guidance for molten hot melt handling cautions.