Denka Dry Neoprene Applications

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Denka Performance Elastomer
Denka Dry Neoprene Applications

Introduction

The major monomer component in every type of Neoprene polychloroprene that is manufactured by Denka Performance Elastomer is chloroprene
(2-chloro-1,3-butadiene). The monomer backbone structure of polychloroprene can be modified by copolymerizing chloroprene with sulfur, 2,3-dichloro-
1,3-butadiene, or other monomers to yield a family of materials with a broad range of chemical and physical properties. By proper selection and
formulation of these polymers, the compounder can achieve optimum performance for a given end-use.

Use

Three general types of Neoprene are available for dry rubber applications: Neoprene G, W, and T types. These elastomers offer a broad range of physical
properties and processing capabilities, so that users can formulate to specific requirements. Raw polymer and vulcanizate properties for each of the general
types are displayed in the following table:

G-Types

G-Types
GRADE	ML 1+4 at 100℃	Crystallization	Features
GNA M1	42–54	Medium	Better raw polymer stability
GNA M2	47–59	Medium	Better raw polymer stability
GW	37–49	Slow	Balanced blend of G & W properties, non-peptizable
GRT M1	34–46	Slow	High crystallization resistance/tack
GRT M2	40–52	Slow	High crystallization resistance/tack

※ When to Use G Types

Compounders choose Denka™ Neoprene G types for applications where building tack is important in fabricating the final product and when the end-use
involves severe flexing or other dynamic stresses, and minimum compression set is not required. Neoprene G types are used when a compound requires high
loadings with a minimum of plasticizer. Because G types break down of soften under shear during mixing, workable viscosities can be achieved.

W-Types

W-Types
GRADE	ML 1+4 at 100℃	Crystallization	Features
W	40–49	Fast	General purpose
W M1	34–41	Fast	Low viscosity W
WHV	106–125	Fast	High viscosity W
WHV 100	90–110	Fast	Lower viscosity W
WB	43–52	Medium	Gel-containing, smooth processing
WRT	41–51	Very Slow	Maximum crystallization resistance
WD	100–120	Very Slow	High Viscosity WRT

※ When to Use W Types

Neoprene W types are chosen where service conditions call for polychloroprene with the best heat aging and compression set resistance.
Neoprene W types frequently are used because of their combination of excellent storage stability, uniform processability, broad compounding latitude, and
all-around good vulcanizate properties

T-Types

T-Types
GRADE	ML 1+4 at 100℃	Crystallization	Features
TW	42–52	Fast	Smoother processing than W
TW 100	82–99	Fast	Higher viscosity TW

※ When to Use T Types

Neoprene T types typically are used in calendaring and extrusion applications. They frequently are used in the production of extruded profiles requiring low
die swell, little distortion, and high green strength.

Characteristics

Neoprene is a multipurpose elastomer that has a balanced combination of properties. All types of Neoprene have these inherent characteristics:

Resist degradation from sun, ozone, and weather,
Perform well in contact with oils and many chemicals,
Remain useful over a wide temperature range,
Display outstanding physical toughness, and
Are more resistant to burning than exclusively hydrocarbon rubbers.

Neoprene G, W, and T types are available in a number of grades.
The table below can be used to evaluate qualitatively physical properties of Neoprene grades, including raw polymer, uncured compound, and vulcanizate
properties.