www.omega.com * Wire Insulation Guide

Insulation Code Insulation Type Appearance Insulation Temperature Range* Abrasion Resistance Flexibility Water Submersion

Overall Conductors

PP
(Extension Grade-EXPP)

Polyvinyl Chloride (PVC)

Polyvinyl Chloride (PVC)

-40 to 105°C
(-40 to 221°F)

Good

Excellent

Good

FF
(Extension Grade-EXFF)

FEP
Teflon or Neoflon

FEP
Teflon or Neoflon

-200 to 200°C
(-328 to 392°F)

Excellent

Good

Excellent

TT
(Extension Grade-EXTT)

PFA
Teflon or Neoflon

PFA
Teflon or Neoflon

-267 to 260°C
(-450 to 500°F)

Excellent

Good

Excellent

Insulation Code	Insulation Type	Appearance	Abrasion Resistance	Flexibility	Water Submersion
Overall	Conductors
PP (Extension Grade-EXPP)	Polyvinyl Chloride (PVC)	Polyvinyl Chloride (PVC)	-40 to 105°C (-40 to 221°F)	Good	Excellent	Good
FF (Extension Grade-EXFF)	FEP Teflon or Neoflon	FEP Teflon or Neoflon	-200 to 200°C (-328 to 392°F)	Excellent	Good	Excellent
TT (Extension Grade-EXTT)	PFA Teflon or Neoflon	PFA Teflon or Neoflon	-267 to 260°C (-450 to 500°F)	Excellent	Good	Excellent

Insulation Code	Resistance To:					Comments
Insulation Code	Solvent	Acid	Base	Flame	Humidity	Comments
PP (Extension Grade-EXPP)	Fair	Good	Good	Good	Good	Color Coded PVC Extruded Over Each Bare Wire. PVC Applied Over Insulated Primaries. Affected by Ketones, Esters
FF (Extension Grade-EXFF)	Excellent	Excellent	Excellent	Excellent	Excellent	Color Coded FEP Extruded Over Each Bare Wire. FEP Jacket Extruded Over Insulated Primaries, Superior Abrasion and Moisture Resistance. Same Basic Characteristics as PFA but Lower Temperature Rating
TT (Extension Grade-EXTT)	Excellent	Excellent	Excellent	Excellent	Excellent	Color Coded FEP Extruded Over Each Bare Wire. PFA Jacket Extruded Over Insulated Primaries, Superior Abrasion and Moisture Resistance. Same Basic Characteristics as FEP but Higher Temperature Rating

Wire Insulation Identification/Application Guide