ASTM D6195 Adhesives Loop Tack Strength Test, Loop Tack Test for Pressure-Sensitive Tape

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ASTM D6195: Test Methods for Loop Tack,

It provides procedures to quantify the loop tack property of pressure-sensitive adhesives (PSAs)—a critical metric for adhesives that form rapid, measurable bonds upon contact (e.g., tapes, labels, stickers). The standard focuses on two test methods (A and B) and is widely used for quality control and research in packaging, labeling, and adhesive manufacturing. It provides a quantitative measure of an adhesive's ability to form an immediate bond upon brief, light contact with a substrate, simulating real-world application conditions where minimal pressure and dwell time are typical.

Test Principle

The core principle is to quantify the initial tack of a PSA by measuring the force to separate a looped specimen from a standardized stainless steel surface. The test simulates real-world “quick-stick” applications (e.g., applying a label) by:

Bringing a PSA loop (with backing) into controlled contact with a 1 in² (25×25 mm) stainless steel surface, using only the specimen’s weight as pressure.

Measuring the peak force required to pull the loop away from the surface (recorded via a tensile tester or loop tack tester).

Classifying failure modes (Adhesion: adhesive-substrate separation; Cohesion: adhesive bulk fracture; Transfer: adhesive residue on substrate).

This principle directly reflects the PSA’s ability to form immediate, reliable bonds—key for applications where instant adhesion matters.

Test Methods of ASTM D6195

Method	Description	Key Features
Method A (Tensile Tester)	Uses a universal tensile testing machine with a loop tack fixture	Specimen: 175 mm (7 in) × 25 mm (1 in) wideMore versatile for research and development.
Method A (Tensile Tester)	(Aligned with FINAT FTM 9 “Quick-Stick” Tack Measurement and TLMI L-IB2 Tensile Tester Loop Tack Test).
Method B (Loop Tack Tester)	Uses a dedicated motorized loop tack tester	Specimen: 125 mm (5 in) × 25 mm (1 in) wide Streamlined for routine quality control applications.

Both methods are validated for PSAs with measurable bond strength and align with industry standards (FINAT, TLMI) for consistency.

Test equipment required for ASTM D6195 Adhesives Loop Tack Strength Test

Testing Machine	For Method A: Universal tensile tester with load cell capacity 50-500N. Speed more than 300mm/min.
Testing Machine	For Method B: Loop Tack Tester: Automated device with upper/lower assemblies, force gauge, and guide pins.
Loop Tack Fixture	Standard fixture to form and hold the adhesive loop with non-adhesive ends clamped. Mounts to tensile tester’s jaws; includes a 1 in² stainless steel panel or raised area for contact. For method B: Stainless Steel Panel: 1×6 in. (25×150 mm)
Notching/Cutting Tool	Method A: 1×7 in. (25×175 mm) die cutter. Method B: 1×5 in. (25×125 mm) die cutter.

Test Specimen information:

Dimensions: Method A uses 1×7 in. (25×175 mm) strips; Method B uses 1×5 in. (25×125 mm) strips.

Unsupported Adhesives: Transfer tapes/laminating adhesives must be laminated to 2 mil PET film before cutting.

Quantity: At least 3 replicates per adhesive to ensure statistical validity.

Conditioning: Store specimens for ≥24 hours in a standard lab environment (23±2°C, 50±5% RH, per ASTM E171) before testing.

Test Application (Industry Fields)

Industry	Applications	Why It Matters
Packaging	Labels, tape, film seals, tamper-evident materials	Ensures products stick on first application without additional pressure.
Medical	Transdermal patches, surgical dressings, medical tapes.	Critical for patient comfort and device functionality.
Automotive	Interior trim adhesion, temporary fasteners	Facilitates assembly processes with reliable initial bonding.
Electronics	Component mounting tapes, protective films	Prevents shifting during manufacturing and handling.
Construction	Temporary bonding, masking tapes, weatherstripping	Ensures quick and secure application in field conditions.
Consumer Goods	Sticky notes, decorative films, stationery adhesives	Directly impacts user perception of "tackiness" and usability.

Test procedures:

1, Specimen Preparation:

Cut specimens to required dimensions (175 mm for Method A, 125 mm for Method B)

If needed, coat adhesive onto 2 mil polyester backing.

Condition specimens at 23 ± 2 °C and 50 ± 5% RH for ≥24 hours.

2, Substrate Preparation:

Clean stainless steel panel with isopropyl alcohol or heptane.

Allow to dry completely before testing.

3, Testing Setup:

For Method A: Mount loop fixture on tensile tester, clamp specimen ends.

For Method B: Load specimen into dedicated loop tack tester, form loop automatically.

Position test substrate on lower fixture, ensuring flat and level contact surface.

4, Test Execution:

Lower loop to contact substrate at 300 mm/min (no dwell time).

Immediately reverse direction, separating at the same speed (300 mm/min).

Record force-displacement curve and peak separation force

5, Result Calculation:

Report peak force in N/25 mm (standard width)

Average results from 5 specimens for statistical significance.

Related Standards

ASTM D6195 is part of a family of standards for PSA testing and is closely related to international counterparts:

Standard	Relationship	Key Differences
FINAT FTM 9	International equivalent for label industry	Similar principle but may use different specimen dimensions
PSTC 16	Pressure Sensitive Tape Council standard	Aligns with ASTM D6195 but with industry-specific applications
GB/T 31125	Chinese national standard for loop tack	Equivalent to ASTM D6195 with minor regional variations
ASTM D3330	Peel adhesion test method	Measures bond strength after applied pressure and dwell time
ASTM D1002	Lap shear adhesion test	Measures shear strength under static load.
EN 1719	Adhesives for paper and board, packaging and disposable sanitary products - Tack measurement for pressure-sensitive adhesives - Determination of loop tack

Importance of ASTM D6195 Testing:

Loop tack testing per ASTM D6195 is critical for material development and quality control due to these key reasons:

Predicts Real-World Performance: Directly correlates with how easily a product bonds during application (e.g., how well a label sticks on first contact without additional pressure);

Differentiates Formulations: Distinguishes between adhesives with similar ultimate bond strength but varying initial tack properties, which is essential for product selection;

Quality Control: Serves as a routine QC parameter to ensure batch-to-batch consistency, preventing production of non-conforming products;

Product Development: Guides formulation optimization for specific applications requiring high or low initial tack, balancing usability and performance;

Customer Satisfaction: Directly impacts user experience - products with insufficient tack may fail to bond properly, while excessive tack can cause handling difficulties;

Regulatory Compliance: Meets industry-specific requirements for products in medical, automotive, and electronics sectors where reliable adhesion is critical for safety and functionality.

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Loop Tack Test Fixture is designed to measure the initial tack (quick stick) of pressure-sensitive adhesives (PSAs) by forming a standard loop with the adhesive surface facing outward, bringing it into controlled contact with a test panel, and measuring the peak force required for separation.

Q1: Why is ASTM D6195 important for pressure-sensitive adhesive (PSA) testing?

A: ASTM D6195 is critical for quantifying the loop tack property of PSAs—an essential metric for adhesives that form rapid, measurable bonds (e.g., tapes, labels, stickers). Per the document’s Significance and Use(Clause 5), the standard:

Provides a quantitative measure of PSA tack for quality control and research.

Focuses on the tack of the adhesive mass(not just the backing, though stiffer backings yield higher values).

Aligns with industry standards (FINAT FTM 9, TLMI L-IB1/L-IB2) for global consistency.

Simulates real-world "quick-stick" applications (e.g., applying a label) where initial adhesion prevents misalignment.

Loop tack is a cornerstone of PSA performance in industries like packaging, medical devices, and consumer goods—this standard reduces guesswork in product design and quality assurance.

Q2: What do the failure modes (adhesion, cohesion, transfer) indicate?

A: The modes reflect different adhesive/substrate interactions:

Adhesion: The adhesive failed to bond to the substrate (poor wetting).

Cohesion: The adhesive bulk fractured (weak internal strength).

Transfer: Adhesive residue remained on the substrate (too aggressive for the surface).

These modes help diagnose formulation issues—e.g., cohesion failure may require a tougher adhesive, while transfer failure may need a less aggressive one.

Q3: Why is stainless steel (ASTM A666) used as the test surface?

A: The document specifies ASTM A666 stainless steel for test panels/fixtures because:

It is a standardized, chemically stable surface that minimizes variability in results.

Its smooth finish simulates many industrial metal substrates (e.g., appliance labels).

Stainless steel resists corrosion and scratching, ensuring long-term fixture usability.

Q4: Can ASTM D6195 be used for unsupported adhesives (e.g., transfer tapes)?

A: Yes. unsupported adhesives must be laminated to 2 mil (0.05 mm) PET film before cutting into specimen strips. This provides structural support during testing.

Q5: What are Method A and Method B in ASTM D6195?

A: Method A: Uses a universal tensile tester with loop fixture; specimen 175 mm × 25 mm.

Method B: Uses a dedicated motorized loop tack tester; specimen 125 mm × 25 mm.

Both use 300 mm/min speed and same principle.

Q6: Why is there no dwell time?

A: To simulate real-world instant application (labeling, taping) where no time/pressure is applied.

Q7: What does high/low loop tack mean?

A: High loop tack: Sticks immediately, good for labels, posters.

Low loop tack: Easy repositionable, used for notes, protective films.

Q8: What factors affect results?

A: Substrate cleanliness, specimen width, loop shape, speed, temperature/humidity, backing stiffness, adhesive layer uniformity.

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