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Flexible PVC Modification

Lock in flexibility with ELVALOY™

We need products to last. From roofing to environmental liners to footwear – lasting is crucial. For products like these containing flexible PVC, ELVALOY™ solid-phase (polymeric) plasticizer adds permanent flexibility, allowing you to make things that have a long service life.

How does it work? The high molecular weight ELVALOY™ (or permanent flexibilizer) won’t migrate to the surface of the flexible PVC and be lost to the environment. By “locking in” flexibility, it helps prevent brittle failure of the flexible PVC sheet or component. As shown below, using ELVALOY HP661 PVC modifier instead of another common plasticizer results in flexibility at much lower temperatures, with properties retained after extraction testing.

TYPE OF PLASTICIZER RANGE OF MOLECULAR WEIGHT
Monomeric up to 500
Polymeric 1,000 to 5,000
ELVALOY 250,000 to 400,000

Product selection for flexible PVC

Our resin offerings used to flexibilize (plasticize) polyvinyl chloride (PVC) compounds include the following, arranged by melt index:

PLASTICIZER (FLEXIBILIZER) MELT INDEX (G/10 MIN)
ELVALOY HP 441 8
ELVALOY HP 661 12
ELVALOY HP 662 25
ELVALOY 741 35
ELVALOY 742 35
ELVALOY HP 771 100

ELVALOY™ PVC plasticizer resin imparts longer-lasting flexibility

ELVALOY™ is a flexible polymer that is highly miscible with PVC during the PVC compounding stage. This makes it a useful PVC plasticizer.

Because it is a high-molecular-weight, solids-phase (non-liquid) PVC plasticizer, ELVALOY resin adds permanent flexibility to the PVC compound, enabling higher-value use in more demanding applications such as weather-exposed roofing and environmental protection membranes.

PVC plasticizer extraction issues, from PVC weathering or exposure to chemicals, can be reduced by using a polymer such as ELVALOY™ that locks itself into the flexibilized compound. ELVALOY performance helps increase the compound’s acceptance of other performance additives such as flame retardants, fillers and stabilizers.

PVC modification in end-use examples

  • Single-ply roofing – membranes modified with ELVALOY™ KEE face sun, hail, dropped tools, spilled or airborne oils and chemicals, and increasing foot traffic lately from “green roof” gardeners and white “cool roof” cleaners.
  • In flexible PVC fold-and-form pipe liners, durable wire and cable jacketing, pond liners, geomembranes and inflatable boats, flexibility can be built into the design with ELVALOY™.
  • Compounding the PVC with ELVALOY™ adds fold-and-form flexibility during pipe liner manufacture, plus in situ installer efficiency through precisely controlled viscoeastic and thermal processing properties of the PVC used for the liner. Several leading underground pipe repair companies use PVC modified with ELVALOY to assure successful handling in this application.