ASTM D3308 Standard Specification for PTFE Resin Skived Tape

Get Certified ASTM D3308 Testing for Reliable PTFE Skived Tape Quality

PTFE skived tape manufacturers need consistent dimensional, mechanical, and electrical properties to support demanding end-use applications. ASTM D3308 gives technicians defined requirements to evaluate skived tape quality and confirm conformity with the applicable type and grade before a batch enters production.

• Covers PTFE resin skived tape in thicknesses from 0.013 mm to 6.35 mm.
• Classifies tape into four types by application and required performance level.
• Divides each type into two grades based on virgin or reprocessed resin content.
• Establishes requirements for dimension, melting point, and tensile properties.
• Measures specific gravity and dielectric strength.
• Checks electrical flaws that do not involve dielectric-strength failure. 
• Uses inch-pound units as the standard reporting basis.
• Defines requirements for PTFE resin skived tape rather than providing general requirements for all PTFE products. 

What are the Uses of ASTM D3308 Testing?

ASTM D3308 testing provides the technical and manufacturing community with a method to determine if skived tape is of the proper type and grade. In applications such as electrical insulation, gaskets, seals, and chemical-resistant linings, manufacturers use PTFE skived tape to ensure dimensional and electrical stability and performance in the services those products are intended to provide. This specification:

• Checks the dimensional consistency of skived tape.
• Verifies tape conformity with specified physical and electrical requirements.
• Supports quality control in PTFE tape production.
• Measures tensile strength and elongation for mechanical performance.
• Evaluates dielectric strength for electrical insulation applications.
• Guides material selection for electrical, mechanical, and chemical applications.

Which Materials Can Be Tested Under ASTM D3308?

ASTM D3308 applies to PTFE resin skived tape manufactured from PTFE molding and extrusion materials. The specification covers tape made from virgin resin (Grade 1) as well as tape made from reprocessed resin or a mix of virgin and reprocessed resin (Grade 2).

Why is ASTM D3308 Important?

ASTM D3308 gives technicians and manufacturers a consistent way to check whether PTFE skived tape meets the requirements for its specified type and grade, covering dimensions, melting point, tensile properties, specific gravity, and dielectric strength. Consistent results across these properties help manufacturers select the right tape type for electrical, mechanical, or chemical applications and avoid in-service performance failures.

Other referenced ASTM documents include ASTM D792 and D882. The ASTM D3308 testing procedure comprises the following steps: 

ASTM D3308 Testing Process and Data Collection

The analyst selects a representative PTFE skived tape sample and identifies its type and grade. Technicians cut the required specimens and measure dimensions, melting point, tensile properties, specific gravity, and dielectric strength. Analysts compare each result with the requirements for the applicable type and grade, and laboratories record the measured values along with the associated test conditions.

Common Challenges and Troubleshooting

Representative sampling, careful specimen cutting, a controlled testing environment, and calibrated equipment are all important factors for achieving accurate ASTM D3308 results. Differences in skive thickness or specimen size can affect measured properties. Technicians minimize this risk by cutting specimens to the desired size, ensuring the proper testing conditions, and calibrating equipment before testing.

• The technician reports the dimensions and compares them with the requirements for the applicable type.
• The analyst reports the melting point and compares it with the specified requirement.
• The technician reports the tensile strength and elongation and compares them with the applicable minimum values.
• The engineer evaluates the test results for specific gravity and dielectric strength against the applicable requirements.

Link to ASTM D3308