What is the modulus of elasticity for PTFE? Key Mechanical Properties Explained

The modulus of elasticity for PTFE, as determined by tensile tests conducted at a rate of 1mm/min according to the DIN/EN/ISO 527-2 standard, is 2800 MPa. This value represents the material's stiffness and its ability to resist deformation under tensile stress. PTFE's mechanical properties, including its tensile strength and elongation, vary depending on the specific testing conditions and standards used, but the modulus of elasticity remains consistent across multiple references for the given test conditions.

Key Points Explained:

1. Modulus of Elasticity for PTFE:

   • The modulus of elasticity, also known as Young's modulus, is a measure of a material's stiffness. For PTFE, this value is 2800 MPa when tested under the conditions specified by the DIN/EN/ISO 527-2 standard at a strain rate of 1mm/min.
   • This high modulus indicates that PTFE is relatively stiff, though it is also known for its flexibility and low friction properties, making it ideal for applications like custom PTFE parts.

2. Testing Standards and Conditions:

   • The value of 2800 MPa is derived from the DIN/EN/ISO 527-2 standard, which is widely recognized for tensile testing of plastics. The test is performed at a controlled strain rate of 1mm/min to ensure consistency and comparability of results.
   • Other standards, such as ASTM D4894, may report slightly different tensile properties (e.g., tensile strength of 22 MPa and elongation at break of 220%), but the modulus of elasticity remains consistent for the given test conditions.

3. Tensile Strength and Elongation:

   • PTFE exhibits a tensile strength ranging from 2990 to 4970 psi (or approximately 20.6 to 34.3 MPa), depending on the specific formulation and testing method.
   • Its elongation at break is notably high, ranging from 220% to 400%, which reflects PTFE's ability to deform significantly before breaking. This property is critical for applications requiring durability and resistance to mechanical stress.

4. Practical Implications for Purchasers:

   • Understanding the modulus of elasticity is essential for designing custom PTFE parts that require precise mechanical performance. For example, seals or gaskets must balance stiffness with flexibility to ensure effective performance under load.
   • The high elongation and moderate tensile strength make PTFE suitable for dynamic applications where parts must withstand repeated stretching or compression without failing.

5. Variability in Reported Values:

   • While the modulus of elasticity is consistently reported as 2800 MPa under the specified conditions, other properties like tensile strength and elongation can vary. This variability is due to differences in PTFE formulations (e.g., filled vs. unfilled) and testing methodologies.
   • Purchasers should always verify the specific standards and conditions under which mechanical properties are reported to ensure they meet application requirements.

Summary Table:

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