TM Proper Elastomeric Seal Selection for Process Analyzer Sample Systems Steve Doe Parker Hannifin Corporation

TM Topics Elastomeric Seals & NeSSI Compounding O-Ring Design Chemical Compatibility Proper Elastomeric Seal Selection for Process Analyzer Sample Systems

TM No Matter Which System... Elastomeric Seals & NeSSI

TM Elastomeric Seals & NeSSI …Elastomeric Seals Are In The Picture!

TM Elastomeric Seals & NeSSI Seal Do’s & Don’ts Do: “Capture” IntraFlow Pressure Connector R-Max Surface Mount Interface (not SP76) SP76 Interface Don’t: Expose Seal ID to Fluid Flow

TM Metal and plastic retained elastomeric composite seals Polymeric and plastic seals Homogeneous and inserted elastomeric shapes Elastomeric O-Rings Rubber and plastic boots/bellows Extruded and precision-cut and fabricated elastomeric seals Thermoplastic engineered seals EMI shielding and thermal management products Seal Group Products

TM Elastomeric Seals & NeSSI Alternatives: Special Geometry O-Ring Seal Special Geometry O-Ring Seal Mold Onto Stainless Wafer Mold Onto Stainless Wafer Stick With in Couterbore (what we have) Stick With in Couterbore (what we have)

TM “… designs and manufactures engineered elastomeric o-ring seals.” Parker O-Ring Division

TM Extrusion & Nibbling Failure Modes Spiral Failure Explosive Decompression Cutting

TM The seal swells, shrinks, loses physical properties, or gets brittle. Excessive swell, brittleness, and dramatic loss in physical properties Shrinkage: the fluid is extracting something from the rubber (changing the base polymer usually isn’t required.) Failure Modes Chemical Attack

TM Butyl (IIR) Neoprene (CR) Ethylene-Propylene (EPR, EPDM) Fluorosilicone (FVMQ) Nitrile (NBR) Polyacrylate (ACM) Hydrogenated Nitrile (HNBR) Polyurethane (AU, EU) Silicone (VMQ) Fluorocarbon (FKM) Tetrafluoroethylene- Propylene (TFE/P) Perfluoroelastomer (FFKM) O-Ring Polymers

TM GLT V A V B V GF V GFLT V Extreme V Hifluor V Parofluor TM V NEW V Performance of Fluorocarbon

TM Performance of Fluorocarbon

TM Parofluor is a true Perfluoroelastomer polymer The Parofluor base polymer is a composition of 3 or more monomers A & B represent different fillers and curatives used to enhance physical & thermal properties Parofluor™ Ultra

TM to 550to 6005 to 4465 to 6085 to 525Temperature Range, F Compression Set, 70 hrs at 400F, % (2-214 O-rings) TR – 10, F Elongation, % Modulus at 100%, psi Tensile Strength, psi 8075 Durometer, Shore A Kalrez 1050 Kalrez 4079 Chemraz 505 FF200-75FF500-75Physical Properties to Kalrez 6375 Parofluor™ Ultra

TM Parofluor™ Ultra

TM Base polymer determines chemical resistance, rough temperature limits, and rebound resilience In some materials, the high and low temp limits can be modified by other compounding ingredients. Provides “baseline” for abrasion resistance, compression set resistance, permeability These can (and almost always are) modified – up or down – by other compounding ingredients. Compounding: Polymer Selection

TM Polymer chains must be cross-linked to achieve resilience and elasticity. Sulfur Organic Peroxides Bisphenol Others: specialty materials have special cure chemistry Compounding: Cure Systems

TM Reinforcing agents add mechanical strength and resistance to abrasion & permeation Carbon black: standard for black compounds Silica: standard for non-black compounds Fillers lower the cost of a compound but reduce compression set resistance and elongation Compounding: Fillers

TM Oils and / or polymers to lower the low temp limits and make the material flow better Reduce resistance to compression set In “generic” materials, they are used to offset the hardening influence of high levels of filler Can extract into process fluids, resulting in seal shrinkage & hardening Compounding: Plasticizers

TM H I = Original Height H D = Compressed Height H F = Recovered Height HIHI HDHD HFHF Compression Set records the amount of permanent deformation of a compressed sample over time. The Lower the Number, the Better Sealing Ability. Compression Set

TM High Temp Compression Set

TM F S = “Spring Force” FSFS Compressive Stress Relaxation records drop in “Spring Force” over time generated by a compressed rubber sample. The Higher the Number, the Better Sealing Ability. Compressive Set Relaxation

TM Compressive Set Relaxation

TM O-Ring Design Is Easy! It’s the O-Ring groove that needs special attention

TM What makes a reliable O-ring design? Squeeze,Seal deforms significantly (~25%),Rubber does not compress or lose volume Stretch Gland fill,Volume-to-void ratio Surface finish,Balance of machining costs with application & testing needs Installation,Protect seal from sharp edges,Provide lead-in chamfers O-Ring Design

TM Compression expressed as a percentage of the free-state cross-sectional thickness of the O-ring. (O-Ring C/S) - Gland Depth (O-Ring C/S) Face Seal:20-30% Static Male/Female:18-25% Reciprocating:10-20% Rotary:0-10% O-Ring Squeeze

TM O-Ring volume as a percentage of Gland volume. (O-Ring Volume) (Gland Volume) About 25% void space or 75% nominal fill Need space in groove to allow for volume swell, thermal expansion, and increasing width due to squeeze O-Ring Gland Fill

TM O-Ring Gland Fill

TM Website Resources

TM Acknowledgements Dan Ewing, Seal Application Engineering Manager Natalie Hicks, Seal Application Engineering Manager

TM Patent Pending Parker IntraFlow ™ Thank You!