PSTC 16

Understanding PSTC 16 and Loop Tack Testing

What is PSCT 16?

PSTC 16 is a standard published by the Pressure Sensitive Tape Council (PSTC) that outlines the procedures for measuring the loop tack of pressure-sensitive adhesives. This test evaluates the ability of the adhesive to adhere to a surface under immediate pressure, a crucial factor in determining how well the tape will perform under normal conditions. The loop tack test is a fundamental part of quality assurance for manufacturers of pressure-sensitive tapes, ensuring they meet performance expectations.

What Is the Loop Tack Test?

Loop tack refers to the force required to separate an adhesive from a substrate immediately after contact. Unlike peel or shear strength, tack measures the instantaneous bond formation capability of the adhesive. The pressure sensitive tape loop tack test simulates real-world scenarios where tapes must adhere swiftly with minimal pressure.

PSCT 16 Loop Tack Test Method

PSTC 16 outlines two distinct methods for performing the loop tack test: Test Method A and Test Method B. Both methods involve forming a loop of adhesive tape, bringing it into contact with a stainless steel panel, and measuring the separation force. The key difference between these methods lies in the testing equipment.

Test Method A
Uses a tensile tester with a 175 mm specimen

In Test Method A, technicians utilize a tensile tester to measure the force required to detach the loop of tape from a surface. This method is precise but can require more setup and calibration.

Test Method B
Employs a dedicated loop tack tester with a 125 mm specimen

Test Method B, on the other hand, uses a specialized loop tack tester, such as the LTT-01 from Cell Instruments. This method provides a more straightforward and automated approach, delivering consistent results with minimal operator input. The LTT-01 is specifically designed to meet the requirements of PSTC 16, ensuring compliance with industry standards.

Test Method A vs. Test Method B

While both methods evaluate loop tack, their equipment and specimen requirements differ:

Aspect	Test Method A	Test Method B
Specimen Length	175 mm (7 inches)	125 mm (5 inches)
Equipment	Tensile Tester	Loop Tack Tester
Contact Area	625 mm² (1 in²)	625 mm² (1 in²)
Applications	Research & Developmenct	Quality Control & Production

Test Method B is often preferred for routine testing due to its specialized design, which minimizes variability and accelerates workflows.

Procedure Highlights for PSTC 16 Testing

1. Sample Preparation
   • Cut specimens to the required dimensions (24 mm width).
   • Condition samples at 23°C ±2°C and 50% ±5% relative humidity for 24 hours.
2. Testing Procedure
   • Clean the stainless steel panel to remove residue.
   • Form the tape into a loop (adhesive facing outward).
   • Bring the loop into contact with the panel using controlled force.
   • Measure the maximum force required to separate the adhesive.
3. Failure Modes
   • Adhesive Failure: Separation at the adhesive-substrate interface.
   • Cohesive Failure: Internal splitting within the adhesive layer.
   • Adhesive Transfer: Residual adhesive remains on the substrate.

Choosing the Right Equipment for PSTC 16 Compliance

For accurate and repeatable results, selecting a loop tack tester designed for PSTC 16 is essential. The Cell Instruments LTT-01 Loop Tack Tester offers:

• 7-Inch Touch Screen: Simplifies parameter adjustments and data visualization.
• PLC Control & Precision Ball Screw: Ensures consistent test speeds (1–500 mm/min) and displacements.
• Customizable Parameters: Adjust dwell time, stroke, and speed to match PSTC 16 requirements.
• Compliant Test Panels: Includes float glass or stainless steel panels for Method A or B.
• Enhanced Safety: Automatic return and limit devices.
• Data Accuracy: Microprinter and software integration for traceable reports.

This instrument not only streamlines compliance with PSTC 16 but also supports FINAT FTM-9 and ASTM D6195 standards, making it a versatile choice for labs and production facilities.

Key Considerations for Loop Tack Testing

When performing loop tack testing under PSTC 16, there are several factors to keep in mind:

• Surface Preparation: The condition of the substrate can impact test results. Ensure that the surface is clean and free from contaminants.
• Tape Type: Different tapes may exhibit varying loop tack values. Choose the appropriate settings on the tester to match the tape’s specifications.
• Environmental Conditions: Temperature and humidity can influence the performance of pressure-sensitive tapes. Conduct tests in a controlled environment for the best results.

By using equipment like the LTT-01, manufacturers can easily control these variables and ensure consistent, reliable testing results.

Contact Us Get Loop Tack Testing Solution

PSTC 16 is a fundamental standard for evaluating pressure-sensitive adhesives using the loop tack test method. By following proper procedures and using a loop tack tester, manufacturers can ensure high-quality adhesive performance. For advanced testing solutions, Cell Instruments’ Loop Tack Tester is an industry-leading choice.