An FFKM O-ring used in a high-temperature vacuum or chemical system must tolerate temporary stretch during installation as well as the service environment. Official M-FFKM-02 data list 17.77 MPa tensile strength and 135.3% elongation at break, giving engineers traceable mechanical inputs for discussing installation margin before validating the actual groove, stretch, and process medium.
Tensile strength gives installation discussions a measured starting point
The M-FFKM-02 Perfluoroelastomer O-Ring page lists 17.77 MPa tensile strength under ASTM D412. This value supports comparisons made under matched test conditions. It does not directly calculate the retaining force or service life of an installed seal.
135.3% elongation leaves room for assembly deformation
The official specification lists 135.3% elongation at break. It provides a material-level reference when the ring must pass over a groove shoulder or component end. Allowable installation stretch still depends on ring size, groove geometry, tools, and recovery after assembly.
75 Shore A supports the ring’s defined shape
The product page lists 75 Shore A under ASTM D2240. Hardness provides a comparative measure of indentation response. Engineers should evaluate it with squeeze, contact surfaces, and process media rather than treating one hardness value as a sealing result.
Conditioned compression-set data completes the picture
The official FFKM O-ring specification also lists 13% compression set after 70 hours at 200°C and 20% after 70 hours at 300°C under ASTM D395. These conditioned values help separate short installation deformation from recovery after sustained high-temperature compression.
Engineering formula: reading stress and strain
Engineering stress and strain are written as σ = F/A0; ε = ΔL/L0. Here σ is engineering stress in Pa or MPa, F is tensile force in N, A0 is original cross-sectional area, ε is dimensionless engineering strain, ΔL is the change in gauge length, and L0 is the original gauge length. ASTM D412 covers tensile properties of vulcanized rubber and thermoplastic elastomers and notes that extension rate, temperature, humidity, specimen geometry, and conditioning affect results. The equations explain controlled specimen data; they do not predict installed O-ring sealing force, leak rate, or service life.
Sampling for semiconductor and chemical equipment
Semiconductor vacuum chambers and chemical equipment can use mechanical data for initial material screening, followed by checks for media compatibility, operating temperature, groove dimensions, installation stretch, and squeeze. For thermal context, see the existing FFKM high-temperature sealing article; this article focuses on mechanical deformation during installation.
Bring dimensions and service conditions to the sample request
Provide the O-ring inside diameter and cross-section, groove dimensions, installation method, process medium, temperature cycle, and intended squeeze. Lixing Composite Materials Co., Ltd. can discuss specifications and samples based on those inputs. Final selection requires validation on the actual assembly.
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