Nonvelope™ for Corrosive & High Purity Services on Glass-Lined Steel Equipment Patent Pending

VSP NonVelope™ for Corrosive & High Purity Services on Glass-Lined Steel Equipment Patent Pending

Engineered NonVelope Corrugated 316 SS Insert Builds on the strengths of the standard envelope gasket while eliminating common weaknesses. NonVelope is constructed using an engineered Microcellular PTFE corrugated stainless steel insert fully encapsulated Filler within microcellular PTFE fillers and bonded to a 100% virgin PTFE envelope for the best available chemical resistance, compressibility, ease of installation and performance. 100% Virgin PTFE Envelope NonVelope Improves upon the Conventional Envelope Gasket

Conventional Envelope Gasket VSP NonVelope

PTFE Virgin PTFE Envelope Envelope

Filler Microcellular PTFE filler Metal Insert Engineereed Corrugated 316SS Insert

PTFE envelope is chemically inert making it Virgin PTFE envelope bonded to PTFE filler, ideal for use in corrosive applications providing a unitary construction eliminating Envelope’s loose, flared leaves often installation issues “fold back” making installation difficult and potentially leaving filler and insert open to Fully encapsulated corrugated 316SS insert is chemical attack and gasket failure engineered to enhance sealability & recovery Filler reduces cold flow and increases and protects against glass to glass contact compressibility Adapts and conforms easier to wavy GLS Fillers often do not provide compressibility surfaces due to enhanced compressibility of necessary for wavy GLS flange surfaces hte PTFE filler Filler materials often become brittle above 250°F causing loss of physical properties Microcellular PTFE filler encapsulates the Fillers are not chemically inert and can be insert and provides complete chemical corroded/degraded by ambient atmospheres resistance of the gasket at ID & OD Metal insert provides metallic barrier between flanges in case of “cut-through” Maximum Temperature Rating: 500°F Metal insert exposed at the gasket OD and subject to external corrosion

VSP Technologies deploys a team of Engineers and Fluid Sealing Specialists who provide engineered solutions for your unique sealing requirements.

8140 Quality Drive, Prince George, VA 23875 800-334-6013 • vsptechnologies.com

NONVELOPE PERFORMANCE

NonVelope seals tighter and at lower NonVelope offers greater compressibility/ stresses than conventional envelope gaskets adaptability than conventional envelope gaskets NPS 3”x150# 1/4” Gaskets NPS 3”x150# 1/4” Gaskets 1.00E+00 0.00

-0.02 1.00E-01 -0.04 1.00E-02 -0.06

1.00E-03 -0.08 -0.10 1.00E-04 Conventional PTFE Conventional PTFE Envelope Compression (in) -0.12 Envelope Leak Rate (mg/sec) 1.00E-05 -0.14 NonVelope NonVelope 1.00E-06 -0.16 0 500 1000 1500 2000 2500 0 500 1000 1500 2000 2500 3000 Gasket Stress (psi) Gasket Stress (psi)

25% Gasket Recovery in Glass-Lined Steel 20% Flanges 15% NPS 3”x150# 1/4” Gaskets 10% Percent recovery/springback after 3,000 psi compression 5%

0% NonVelope Conventional PTFE Envelope Product Specifications NonVelope in GLS Flanges

Molded or sheet ePTFE gaskets are Temperature Limit Max= 500°F Min= -330°F sometimes used in glass-lined steel Maximum Compression Full vacuum to maximum flange flanges but: rating - offer little recovery and poor cycling performance Chemical Resistance All chemical services (pH 0-14) except molten alkali - easily cut or sheared which can metals, elemental fluorine cause damage to the glass flanges and aggressive tri-flouride - require high asembly torques to compounds fully densify the fibrous matrix Materials of Construction Virgin PTFE Envelope Virgin Microcellular PTFe Filler NonVelope offers: 316SS Corrugated Insert Greater recovery to handle cycling Standard Sizing/Thickness 1/4” Thickness than traditional envelope or ePTFE Old Standard NPS Sizing gaskets Other thickness and sizing availabel upon request Protection from cut-through and shearing through use of premium Ensure complete mechanical and specification and compliance with PTFE envelope and filler and VSP’s NonVelope Torq-Kit corrugated insert All Flange rework components in one box with assembly instructions to ensure reliable Lower assembly torques to performance conform to wavy glass flange Contact VSP for ordering information surfaces and effetively seal