Adhesive Web Basis Weight Selection [Guide]

Updated September 2026 by Shanghai Tengyang New Materials Technology Co., Ltd.

Adhesive web basis weight selection is the process of choosing a suitable adhesive mass per area, using an appropriate adhesive grade and testing on the real substrates. Generally, the applicant weighs three options, qualifies the lightest web, and verifies that it meets requirements for bond strength, appearance, and durability in service. From a practical standpoint, more adhesive does not guarantee increased strength of the bond. The measurement examples and cost scenarios below are illustrative calculations, not Tengyang laboratory results or supplier quotations.

What adhesive web basis weight measures

Net adhesive mass excludes the core and release liner; INDA defines basis weight as mass per area.

Adhesive web basis weight is the mass of adhesive spread over a web and is expressed in terms of mass per unit area. For example, a web with an adhesive basis weight of 30 g/m² supplies 30 grams of adhesive over one square meter. It’s to be noted whether the specified mass includes release liners and other auxiliary layers.

“The weight of a unit area of fabric.”

INDA, definition of basis weight

From the Procurement perspective, the mass of adhesive, type and nature of polymers and the architecture of adhesive constitute the three key parameters. Webs of similar mass may differ in structural architecture of fiber, and may exhibit different propensity for bonding. A web may occupy less space or have a greater thickness, or caliper, than another web without necessarily having higher adhesive mass per area; density instead describes mass per unit volume.

The shipping weight of a roll increases with the core and the release liner; however, these components do not increase the net adhesive mass. Use a net adhesive specification when comparing grades, and keep gross roll weight as a separate logistics figure. Mention gross roll weight (which includes the core and release liner) as a separate parameter for logistics.

Which GSM values should enter your first trial?

Illustrative 20, 25 and 30 g/m² trials use the same adhesive grade and substrate lots.

Select low, middle and high adhesive weights from a grade recommended for the actual substrate pair. A selection might be 20, 25 and 30 g/m². Different applications involving fabrics, foams and filtration media require their own weight trials. Availability should be confirmed prior to evaluation.

Protechnic lists standard weights of 8, 12, 16, 20, 25, 30, 35, 50 and 60 g/m². Those are supplier-specific supply options; the list doesn’t assign a guaranteed application to each weight. Likewise, a product family’s advertised range doesn’t establish that every chemistry is available at every GSM.

A sample request should include a definition of the defect being evaluated, target acceptance criteria and the evaluation to be performed. Defining these requirements is more useful than treating “light”, “medium” or “heavy” as standardized performance classes. If the supplier recommends a different ladder, ask what changed the starting point: porosity, surface finish, adhesive compatibility or processing limits.

Start with substrates, chemistry and end use

Match substrates, adhesive chemistry and service tests before selecting web GSM.

Adjusting GSM shouldn’t be the first consideration when selecting an adhesive. The nature of the service conditions should be considered, as well as the service temperature and the nature of the substrates. Service conditions alone don’t necessarily dictate the choice of adhesive. It may be useful to send actual substrates with their production coatings for the supplier to recommend an appropriate grade and activation conditions.

Bostik explains that insufficient coat weight can weaken bonding while excessive weight can cause bleed-through. Either symptom can also have another cause. Poor contact, inadequate activation or an unsuitable polymer won’t necessarily be corrected by adding adhesive.

Polyamide, polyester and polyolefin webs are distinct choices, and performance varies within each family. Our industrial fusible web guide explains the broader selection context. Keep the web format separate from film, powder and pellet alternatives when comparing supplier data.

What environment will the laminate be exposed to? Can it withstand washing? Can it withstand flexing? Can it withstand different levels of humidity and/or different chemical exposures? Peel strength is one test and there can be other tests that are just as important. Filters must also be assessed for required filtration efficiency and pressure drop, rather than air permeability alone.

Measure the adhesive you are actually buying

Illustrative 0.30 g over 0.01 m² equals 30 g/m²; balance resolution is not measurement accuracy.

Net adhesive mass per unit area is the property that’s mainly of interest and should be agreed upon with the supplier. Results may vary across sampled positions, and reporting only the means can mask potentially large variations.

Known-area example

GSM = net adhesive mass (g) ÷ specimen area (m²).

A 100 mm × 100 mm specimen has an area of 0.01 m². If its adhesive mass is 0.30 g, the result is 30 g/m². Each balance increment of 0.01 g corresponds to 1 g/m² at this area; that’s resolution, not total measurement accuracy.

Separate adhesive mass should be calculated using equal measured areas and representative liner specimens. In the absence of a perfectly clean separation, other validated methods can be agreed upon. In addition to the means, provide individual results and other relevant information, for example, the dimensions of the specimens and the resolution of the measuring device.

ISO 9073-1:2023 addresses mass per unit area of nonwovens. The published scope does not itself establish a liner-subtraction procedure for your purchase. Similarly, ASTM D3776/D3776M’s small-swatch option cautions that a result may represent the sample rather than the lot. Agree the applicable method instead of claiming compliance from a simple weighing example.

Nominal weights expressed in ounces per square yard (or other similar units) by a nonwovens supplier should be converted to grams per square meter (GSM) using the conversion factor prior to acceptance.

Build a controlled three-weight bonding trial

Different process settings compare bonding systems, while controlled trials isolate GSM changes.

The so-called 3-Weight Trial Ladder states that weight screening and production qualification are separate activities. For weight screening, compare the result of bonding a sample at one adhesive weight with that of the other sample weights, using the same adhesive grade, raw materials, substrate lots, processes and equipment. The screening activity doesn’t define a process window, and shouldn’t be confused with weight control during production.

Maintain the same substrate lots and record actual conditions of the glue line. Record process conditions (e.g., pressure, time, temperature, etc.). Dwell is just one parameter that affects the bond. Other conditions, including the state and/or condition of the substrate, affect the bond. Depending on the adhesive used and the substrate, the machine setpoints and/or settings may not completely describe the thermal history of the adhesive. Strong bonds occur for a myriad of reasons. Without reliable data to support the need for a production run, isolated strong bonds shouldn’t control a production order.

**3-Weight Trial Ladder:** illustrative sample plan; no measured performance or pass decisions are claimed.
Candidate	Controlled comparison	Quality decision to record
Low: 20 g/m²	Same agreed grade and substrate lots; measure actual GSM	Bond result, failure location, appearance and service-test result
Middle: 25 g/m²	Same documented glue-line conditions and conditioning	Compare repeatability with the low-weight candidate
High: 30 g/m²	Same controls; inspect the face and reverse for adhesive transfer	Determine whether added mass improves acceptance or creates defects

Select the test method with the customer. ASTM D1876-08(2023) evaluates relative peel resistance using a T-type specimen with flexible adherends. That scope does not make it suitable for every laminate or supply a universal minimum in N/mm. Agree the specimen, conditioning, test method, required result and acceptable failure mode before testing.

Production qualification includes documenting each finalist’s settings and agreeing on specimen tests and the acceptable failure mode; different settings compare bonding systems rather than GSM alone. Interactions among the processing conditions should be investigated. Accelerated testing doesn’t ensure that a bond will last for an extended time. The least amount of add-on should be used only if it supports the required function with sufficient performance margin across the qualified process window.

Read defects before adding more adhesive

Nine bonding symptoms call for targeted checks before adding adhesive; editorial diagnostic guide.

Changes in coat weight should be done in a systematic and planned manner. Troubleshooting and investigating the cause and effect relationships should be done based on the most likely causal factor(s), holding GSM constant while checking that cause and then changing one factor at a time. A clean interface, a torn foam layer and a softened adhesive line require different investigations.

The following triage table combines Bostik’s coat-weight guidance with editorial trial recommendations. ISO 10365:2022 provides failure-pattern terminology; it does not turn a particular failure pattern into automatic acceptance.

**Defect-to-next-check matrix:** possible causes to investigate, not diagnoses from appearance alone.
Observed symptom	Competing explanation	Next controlled check
Clean interfacial separation	Compatibility, contamination or inadequate contact	Confirm surfaces and activation before raising GSM
Unmelted web remains	Insufficient heat transfer or dwell	Check glue-line conditions against the grade guidance
Adhesive on both faces	Cohesive failure or incomplete development of the joint	Record failure pattern and conditioning before comparison
Foam tears	Substrate strength limits the observed result	Judge load and damaged area against the assembly requirement
Bleed-through	Excess add-on, excessive flow or open face structure	Compare controlled weight and process changes separately
Stiff hand or reduced drape	Add-on, polymer choice or excessive consolidation	Assess flexibility alongside bond performance
Patchy cross-width bonding	Uneven heat, pressure, contact or mass distribution	Map machine position against measured GSM and bond results
Creep in hot service	Grade unsuitable for the load and temperature	Review service requirements and chemistry before adding mass
Delamination after washing	Grade, substrate treatment or processing mismatch	Repeat the agreed wash exposure on controlled samples

Foam tearing can be useful evidence without being a pass: the assembly may still fail below its required load. Likewise, distinguish activation temperature from service temperature when investigating hot-service failure.

Calculate roll mass and cost per good part

Hypothetical adhesive costs per 1,000 good parts: $9.47, $6.32 and $10.00 as GSM and yield change.

When comparing the cost of an adhesive per accepted good part, also consider trim loss and yield. Reducing the g/m² of adhesive can increase the cost benefit when other inputs stay equal, but this may be negated if the acceptable output decreases. The Good Part Add-On Ledger shows an example of this.

Net roll adhesive mass (kg) = GSM × width (m) × length (m) ÷ 1,000. For example, 30 g/m² × 1.5 m × 100 m ÷ 1,000 = 4.5 kg. This covers the purchased adhesive area and excludes liner and core mass. The definition follows mass per area, as used in ISO 9073-1’s measurement scope; the purchasing model is our illustrative calculation.

Required purchased area for 1,000 good pieces of 0.04 m² each, at 80% utilization and 95% post-trim accepted yield, is 1,000 × 0.04 ÷ (0.80 × 0.95) = 52.63 m². Here, utilization accounts for trim, while accepted yield applies to the pieces produced after trimming; count each loss only once.

**Good-Part Add-On Ledger:** adhesive-only cost per 1,000 good pieces. All scenarios assume 0.04 m² per piece, 80% utilization and $6/kg net adhesive.
Scenario	Accepted yield	Purchased area	Adhesive mass	Adhesive-only cost
30 g/m² baseline	95%	52.63 m²	1.579 kg	$9.47
20 g/m², equal yield	95%	52.63 m²	1.053 kg	$6.32
20 g/m², hypothetical lower yield	60%	83.33 m²	1.667 kg	$10.00

The third line shows sensitivity to yield, not a predicted penalty for a lighter web. Eliminate assumptions, and give production data. If the quote is per roll and includes liner/packaging, determine cost per accepted piece by dividing the entire roll cost by the number of accepted pieces that roll yielded.

An important cost constraint when making the part is the accepted output, alongside the cost of adhesive. Finance seeks adhesive cost per good part. Production seeks good parts per unit time. Quality seeks what happens to the part after a given time and environment. Other costs of converting to the part, including labor, energy, downtime, inspection and discarded substrate, may exceed savings from using a less expensive roll. A less expensive roll may not resolve all differences in opinion.

Write a purchase specification the supplier can test

Specify net adhesive mass, grade, agreed tolerances and acceptance tests for the order.

Give a purchasing specification that defines the approved adhesive web grade, identifies nominal net adhesive GSM and its agreed tolerance, and states dimensional requirements and the acceptance method for the order. Also agree a sampling plan. These reviewed documents alone do not address all concerns about grade-specific adhesive-web tolerances.

Use the specification table to integrate procurement and production records. For weighing, agree whether a nonwoven method such as ISO 9073-1 applies to the supplied construction, including any agreed adaptations. Do not list a standard number without a usable procedure.

**Sample-to-order specification:** fields to agree for the approved adhesive web.
Purchase field	What to record	Evidence to retain
Grade and chemistry	Exact supplier grade; approved substitutions	Technical data and approved sample identity
Net adhesive basis weight	Nominal GSM and agreed tolerance	Measurement method and individual readings
Sampling and conditioning	Width positions, roll positions and conditioning	Lot sampling agreement
Usable dimensions	Usable width and supplied roll length	Inspection record and trim assumptions
Core and liner	Core size; liner identity and release needs	Line handling trial
Splice policy	Allowed splices, identification and handling	Order agreement and roll labels
Substrate pair	Materials, surface treatments and lots	Retained approved substrates
Production window	Documented activation, contact and cooling conditions	Qualified trial record
Acceptance and service tests	Method, conditioning, limits and failure-mode rules	Initial and exposure-test results
Traceability and changes	Lot identity, storage guidance and requalification triggers	Change notice and retained sample policy

Revisit qualification when the adhesive grade, substrate finish, mass distribution or operating conditions change. To discuss trial samples with Tengyang, send your substrate pair and required service tests through the hot melt adhesive web product page. Include the current bonding problem and proposed acceptance criteria.

What lighter webs change in future specifications

Qualify complete laminate performance; Protechnic describes open-web design, not universal airflow gains.

State requirements on reduction in material and define the laminate performance to retain. Using less adhesive, in a given construction, doesn’t prove that the structure can be recycled. The technology should also be assessed for its potential impact on the whole product. Web openness is a design consideration and should be assessed independently of nominal GSM.

Protechnic’s 2025 open-web discussion describes fiber arrangement intended to improve permeability. Treat that as a supplier development direction, not a universal relationship between lighter weight and better airflow. Keep the final specification tied to measured performance of the complete laminate. Before accepting a lighter web, repeat the approved bond and service tests on production substrates. For a foam-to-fabric assembly, reject a weight reduction that saves adhesive but increases delamination or damage during flexing. Record accepted output alongside material consumption.

Frequently Asked Questions

Does higher GSM always give a stronger bond?

Higher GSM adds adhesive mass; it does not guarantee greater bond strength, because strength also depends on polymer compatibility, surface condition and the actual bonding process.

Strength also depends on polymer compatibility, wetting, heat transfer, pressure and substrate condition. Excess adhesive can bleed through a porous face or change the laminate’s feel. Compare weights within a suitable grade under controlled conditions, then qualify the successful candidates against actual service requirements. A measured bond result, including its failure mode, is more useful than weight alone for an order decision.

Should release paper be included when checking adhesive web GSM?

Net adhesive GSM excludes the release paper.

Release paper adds mass without becoming the intended adhesive layer. Weigh adhesive alone over a measured area, or use an agreed subtraction method with equal-area representative liner specimens. Check that removal leaves no adhesive behind and doesn’t remove fibers or other material. If clean separation is impossible, agree a validated alternative with the supplier rather than treating an uncertain subtraction as a precise result.

Can I choose adhesive web GSM from fabric GSM alone?

Fabric GSM alone cannot determine the required adhesive weight.

Fabric GSM describes the fabric’s mass per unit area, but it doesn’t fully describe pore structure, surface finish, fiber chemistry or heat sensitivity. Two fabrics with similar weight can wet and bond differently. Give the supplier both actual substrates and the required performance tests. Use the recommended compatible grade to select trial weights, and compare the bonded assemblies before approving a production specification.

Are hot melt adhesive web bonds permanent?

Durability depends on the grade, substrates and service exposure.

Qualify washing, flexing, temperature and chemical exposure for the assembly. Thermoplastic web bonding isn’t a universal heat-resistant or irreversible joint.

What materials can adhesive web bond?

Suitable grades bond textiles, foams and other laminating substrates.

Match chemistry and activation conditions to the actual pair; one grade won’t bond every material.

References & Sources

Sources checked September 2026. Standard references below use the publishers’ public scope descriptions; this article doesn’t reproduce their full test procedures. Supplier publications support the attributed product information. Trial design, diagnostic checks and cost scenarios are editorial guidance to adapt to the actual assembly.