MEASUREMENT SPECIFICATION 01

Textile Measurements: Linear Density and Barrier Reports

Textile measurement units refer to various quantities which are identified as: yarn mass per length, fabric mass per area, and performance under defined test conditions. This index is there to facilitate interpretation of material reports, support comparable units conversion, and ease setting up the textile bonding inquiry document.

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Textile Measurements: Linear Density and Barrier Reports

Start with the quantity. A denier value cannot replace GSM, and a water-vapor result cannot stand in for resistance to liquid water. Matching the unit is only one part of matching the report.

Textile Report Quantities at a Glance

Identify the line on your specification before choosing a calculation. Use the tools to catch a unit mismatch before you send your specification to Tengyang. Converting a quantity does not establish material quality or test equivalence; ISO 2060 and ASTM D3776, for example, address different measurements.

Yarn

Tex, dtex, denier = lineal densities – count system such as the cotton count or metric count must be specified separately.

Fabric

GSM means grams per square meter. Thickness, roll width and thread count describe separate characteristics.

Barrier testing for water vapor transmission and hydrostatic pressure

Barrier reports

Keep water vapor transmission, evaporative resistance and hydrostatic pressure in separate columns.

Choose a calculation

Yarn Linear Density and Count Systems

In the direct systems, tex is grams per 1,000 meters, dtex is grams per 10,000 meters, and denier is grams per 9,000 meters.

Dimensional reference values, not Tengyang product specifications

Quantity	Reference value	Use
Linear density	1 tex = 1 g / 1,000 m	Mass for a stated yarn length
Linear density	1 dtex = 1 g / 10,000 m	A finer metric increment
Linear density	1 denier = 1 g / 9,000 m	Same dimension, different reference length
Direct conversion	20 tex = 200 dtex = 180 denier	Illustrative equivalent expressions
Mass per area	1 GSM = 1 g/m²	Fabric or film areal mass
Mass per area	1 oz/yd² ≈ 33.90575 g/m²	Avoirdupois ounce per square yard
Length	1 yard = 0.9144 meter	Length only; width remains a separate input

Within each direct system a bigger number means more mass per meter or unit length; in an indirect system such as English cotton count, the bigger the number, the finer the yarn with less mass per length, so the numbers must always be accompanied by their measurement system designation.

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Tengyang Adhesive Materials

We supply hot melt adhesive films for textile bonding applications. Our film range includes TPU, EVA, PA, PES, and PO. Tengyang also supplies adhesive web, powder and granules, so the enquiry can identify the required material form before comparing dimensions or test reports.

SEC.01 // Film families

TPU hot melt adhesive film is one choice we use to try to satisfy bonding enquiries.
EVA hot melt adhesive film is also part of our material offering.
PA hot melt adhesive film is available from Tengyang.
Our range includes PES hot melt adhesive film.
Tengyang also supplies PO hot melt adhesive film.

SEC.02 // Other forms

We supply hot melt adhesive webs.
We supply hot melt adhesive powders.
We supply hot melt adhesive granules.

SEC.03 // Customization

We support customized thickness and width.
We support custom color and melting point requirements.
We provide application support and support application-specific formulations and OEM requirements.

ASTM F1249-25

Identification of material names such as a brand name or an established grade is merely the starting point of any discussion; ASTM F1249-25 is a measurement method within its stated scope, and the overall construction and conditions still need to feature within any report because performance is not guaranteed by the brand or grade of material alone.

Enquiry input: Send the two surfaces to be joined, the intended application and the adhesive form under consideration. Include an existing report when barrier behavior is part of the requirement.

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Fabric Construction and Lamination

Matching GSM values do not necessarily mean construction is the same. For instance, a different fabric can have the same grams per square meter while utilizing other fibre, weave, coating or surface finish, and the reported sample may be a whole composite or a selected layer.

Garment bonding

For a garment or underwear application, specify face fabric, linings and adhesive layer along with whether the sample material was recorded as loose fabric, a bonded panel or the completed seam.

Shoes and leather

Specify the two bonding surfaces and desired flexibility; base-material weight only refers to one element of the construction and doesn’t imply full part thickness or drape.

Other assemblies

In order to help with automotive interior, reflective materials and packaging applications, specify the exact layer order; this is important especially if a polymer film report was obtained.

ASTM STANDARD COMPLIANCE

ASTM F1249-25 covers single-layer and multilayer flexible barriers within its scope, including coated materials. A report mismatch creates a problem because the tested layers may differ. ASTM F1249 does not require a different method for every laminate; send your specimen description with the test result for a Tengyang application enquiry.

Selection trade-off:

Bonding requirements and the desired textile handle must be considered together. Choosing by the base fabric’s report alone can leave an important assembly requirement unanswered.

Tengyang application enquiry

Fabric Weight and Dimensional Units

The weight of a fabric value recorded in GSM equates to its mass per square meter, not a thickness value; the simplest calculation for an areal density is grams of the sample divided by square meters of sample, so 2 grams / 0.01 m² = 200 g/m², approximately 5.9 oz/yd². For a measured swatch, divide mass in grams by area in square meters; one gram per 0.01 m² corresponds to 100 grams per square meter. This maths cannot resolve sampling or conditioning errors, please remember this.

Textile Measurements Linear Density and Barrier Reports specification blueprint

REF-01

Worked example

For a buyer checking an incoming fabric test report, a hypothetical 10 cm × 10 cm specimen has an area of 0.01 m². This does not identify any quantity purchased or any product in our catalog; it is an illustrative calculation.

REF-02

Check a GSM and oz/yd² conversion

A small sample does not necessarily confirm that entire production run; note the chosen sampling options in the test report – ASTM D3776/D3776M-20 (2025) refers to four sampling options where the ‘small swatch’ category may not be sufficient to give any indication to the product run. Record sample conditioning and whether the selvage was included.

SPECIFICATION CRITERIA // DATA MATRIX SYS.OK

Specification line

What to retain

Common comparison error

GSM or oz/yd²

Area basis and specimen preparation

Comparing an ounce of mass with an ounce per square yard

Linear meter or yard

Usable width and length

Treating length as area without the width

Roll mass

Net material mass and packaging exclusion

Using gross shipping weight as fabric weight

Thickness

Method, applied pressure and material scope

Inferring thickness directly from GSM

View Calculation Tools

Adhesive Quote Inputs

We support textile bonding enquiries for garments, shoes, leather and other listed applications. Give Tengyang a consistent specification so film, web, powder or granule options can be discussed on the same basis. Include your required delivery date for discussion with the quotation.

Identify the assembly: identify both substrates, layer order, surface treatment and final use.

State dimensions: required width and thickness, with the unit written beside each value.

Give the quantity basis: Provide a quantity basis – area, length, mass or piece -together with relevant conversion inputs.

Describe the process: Describe your process including available equipment constraints and the required material form.

Attach acceptance requirements: Include the test method, specimen state, test conditions and any available test report.

For a roll comparison, width links a running-length price to an area price. An ounce and a pound describe mass, while a meter and a yard describe length; comparing quotations across those bases requires the missing dimensions. Use the same usable-area basis before assessing material cost.

Tell us your material, bonding process, temperature, width, thickness, and application requirements.

Tengyang application support

Send your bonding specification

Barrier Test Reports And Conditions

Water vapor transmission rate, often simply called WVTR, describes the rate at which water vapor passes through a material specimen under specified conditions; if a report uses moisture vapor transmission rate or MVTR, confirm the measured quantity and method behind that abbreviation.

Report Quantity

Unit Expression

Interpretation Boundary

Water vapor transmission

g/(m²·day)

Mass transferred per area and time under the stated conditions

Evaporative resistance, Ret

m²·Pa/W

Resistance measured with a specified apparatus; not a direct WVTR conversion

Hydrostatic pressure

kPa or stated height

Resistance to liquid-water penetration, not vapor transmission

Different Principles, Different Scope

ASTM F1249-25 Uses a modulated infrared sensor for water vapor transmission through plastic film and sheeting. Its scope includes flexible single-layer or multilayer barriers up to 3 mm thick; it also cautions that simple relationships between thickness, vapor-pressure difference and transmission may not always apply.

ISO 11092:2026 Addresses steady-state thermal and water-vapour resistance, including multilayer assemblies. Although water molecules pass through the specimen, ISO 11092 reports resistance rather than WVTR, so an analysis that directly translates from vapor transmission to sweating guarded hotplate test outcomes, which measure thermal and water-vapor resistance in a different way, cannot simply be performed by numerical translation.

Liquid water is separate: ISO 811:2018 Measures resistance to water penetration under hydrostatic pressure. The ability to let vapor permeate does not provide its liquid-water result; report both when the application needs both.

Identical WVTR units are not interchangeable proof of equivalent performance! Comparing water vapor transmission rate units in isolation leads to flawed ranking because the environmental or driving conditions could be significantly different. ASTM E96/E96M-24a, a gravimetric water-vapor transmission rate test standard including both desiccant and water methods, cautions readers against using such values for other conditions or methods and emphasizes clearly stated temperature and relative humidity alongside measured transmission rates.

Open the report comparability checklist before placing two barrier figures in a comparison table.

Access Checklist

Textile Measurement and Bonding Laboratory Environment

REPORT IDENTITY GRID

How We Work with Textile Reports

Using the Report Identity Grid to organize an enquiry keeps a measurement attached to the test conditions it was generated under, so that a simple unit conversion does not hide a discrepant measure.

QUANTITY

Linear density, areal mass, thickness, vapor transmission, resistance or liquid-water penetration

UNIT

The complete denominator, including length, area and time where relevant

METHOD

Standard number, edition and procedure or option

CONDITIONS

Temperature and humidity, orientation and relevant conditioning

SPECIMEN

Layer construction, thickness and state, including any specified pretreatment

ACCEPTANCE

The actual requirement and the party responsible for confirming applicability

NOTICE:

The Grid is simply an enquiry tool; it is not an actual testing standard, nor does it automatically render equivalence declarations when you fill in the form: if some fields do not contain the necessary information, request it, and if separate reports present values you want to compare, clarify whether you are comparing methodologies, configurations or merely units.

Next step: Send the completed descriptions with your substrate and adhesive requirements to Betty Fang. Tengyang supports custom thickness, width, color, melting-point requirements and application formulations.

Contact Betty Fang

Request a Textile Bonding Discussion

We supply hot melt bonding materials and support OEM and application-specific requirements. Send your textile specification and assembly details to start a material discussion with Tengyang.

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Contact

Betty Fang | +86 13122233268

Headquarters

Shanghai Tengyang New Materials Technology Co., Ltd. No. 58 Fumin Branch Road, Hengsha Township, Chongming, Shanghai, China

Measurement Boundaries

Converting figures, as a numeric value alone without understanding the underlying context, is the wrong answer to discrepant specifications and does nothing for shortcomings arising from unknown sample treatment or specimen conditions.

It is not enough to cite yarn denier to derive GSM values; the fabric configuration and amount of yarn per unit area are essential too.

To derive thickness from GSM values alone doesn’t make sense, especially when the measurement conditions of the tested material are not cited nor the specimen’s yarn structure explained.

Don’t take for granted that direct numerical conversion of Ret into WVTR will give you a valid result: ISO 11092 and water vapor transmission tests provide different measured quantities.

Hydrostatic resistance of a fabric or another material gives us a measure of resistance to liquid-water penetration but does not measure vapor transmission performance of the product, so don’t use it as that measure. ISO 811 addresses liquid-water penetration.

Using results on individual elements to calculate or compare properties of the overall assembly or multiple-material compositions can give erroneous comparisons because the tested specimen might differ from the overall item; first match the specimen.

A useful stopping point

For a reported sample that is missing a method or temperature and humidity description, ask for additional information or complete data, since an equivalence statement lacks a basis without complete information; include the application and asked requirements in your enquiry. If a Tengyang product quote is being prepared, include your desired sample application so we can discuss this alongside the reports that you provide.

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Textile Measurement Tools And Resources

Utility // 01

Tex, Dtex, And Denier Converter

Open Converter

Utility // 02

Fabric GSM And oz/yd² Calculator

Open Calculator

Utility // 03

Report Identity Grid

Open Grid

FAQ: Textile Measurement Questions

Does heavier fabric always mean better quality?

No, the number alone for fabric weight says very little concerning usage suitability, which must often be based on the applications and material construction itself; the amount of yarn per unit area can also affect the result, and even a heavy sample is not necessarily the better choice for specific purposes.

Which water vapor transmission rate unit should I compare?

Units such as ‘grams/m²/day’ should always be reported and retained with the test method and conditions. These units can be changed to equivalent units without changing the method itself; this does not make different test methods or conditions equivalent.

What should I send for an adhesive enquiry?

Include two separate layers if they are specified, list the application and intended use, and the form the materials will be used in and any specific dimensions needed. Include, if necessary, the actual report and any acceptance standards that the material must meet, and state if resistance to liquid-water penetration is a requirement for the desired material.

Can a photograph confirm that a fabric is 220 GSM?

No. A photograph has neither a measured mass nor a known sample area. Ask for the stated weight and sampling method, then compare a measured specimen with that specification; ASTM D3776 distinguishes small-swatch results from options that can represent a larger piece, so the origin of the sample matters as well as the number on the scale.

Can the local yarn count converter handle Ne and Nm?

No. This converter handles tex, dtex and denier only.