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Wire Insulation Identification and Application Guide

Wire Insulation Identification

Insulation
Code


Insulation Appearance of
Thermocouple Grade Wire
  Temperature Range  
Insulation
Abrasion
  Resistance  
  Flexibility   Water
  Submersion  
  Overall     Conductors  
PP
(Extension
Grade-EXPP)
Polyvinyl
Chloride
(PVC)
Polyvinyl
Chloride
(PVC)
Extension Grade - EXPP -40 to 105°C
-40 to 221°F
Good Excellent Good
FF
(Extension
Grade-EXFF)
FEP
PFA or
Neoflon
FEP
PFA or
Neoflon
Extension Grade - EXPFF -200 to 200°C
-338 to 392°F
Excellent Good Excellent
TT
(Extension
Grade-EXTT)
PFA
PFA or
Neoflon
PFA
PFA or
Neoflon
Extension Grade - EXPTT -267 to 260°C
-450 to 500°F
Excellent Good Excellent
KK Kapton Kapton KK -267 to 260°C
-450 to 500°F
Excellent Good Good
TG Glass
Braid
PFA
PFA or
Neoflon
TG -73 to 260°C
-100 to 500°F
Good Good Excellent
GG
(Extension
Grade-EXGG)
Glass
Braid
Glass
Braid
Extension Grade - EXPGG -73 to 482°C
-100 to 900°F
Poor Good Poor
HH High Temp
Glass
Braid
High Temp
Glass
Braid
HH -73 to 704°C
-100 to 1300°F
Poor Good Poor
XR Refrasil
Braid
Refrasil
Braid
XR -73 to 871°C
-100 to 1600°F
Poor Good to
315°C (600°F)
Poor to
315°C (600°F)
XC
Standard Braid
XL-Loose Braid
XT-Tight Braid
Nextel
Braid
Nextel
Braid
XC -73 to 1204°C
-100 to 2200°F
Poor Good Poor
XS Silica Silica XS -73 to 1087°C
-100 to 1990°F
Poor Good Poor
TFE TFE
PFA
TFE
PFA
TFE -267 to 260°C
-450 to 500°F
Excellent Good Excellent


Application Guide
Resistance To: Comments
Solvent Acid Base Flame Humidity
Fair Good Good Good Good Color Coded PVC Extruded Over Each Bare Wire. PVC Applied Over Insulated Primaries. Affected by Ketones, Esters
Excellent Excellent Excellent Excellent Excellent Color Coded PVC Extruded Over Each Bare Wire. PVC Applied Over Insulated Primaries. Affected by Ketones, Esters
Excellent Excellent Excellent Excellent Excellent Color Coded PFA 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
Good Good Good Good Excellent Fused Kapton Tape Approx. 0.15 mm Applied to Conductors. A 0.10 mm Jacket Is Then Applied to Both. Excellent Moisture and Abrasion Resistance, High Dielectric Strength (7 kV/mil) Retains Much Physical Integrity After Gamma Radiation. FEP Is Used as Adhesive Binding Agent (Melts at approx. 260°C [500°F])
Excellent Excellent Excellent Excellent Excellent PFA Extruded Over Each Bare Wire and a Glass Braid on the Jacket. May Be Used for Single Measurement to 343°C (650°F)
Excellent Excellent Excellent Excellent Fair 0.12 mm Glass Braid Over Each Conductor, and Binder Impregnated. Overall Glass Braid Applied and Bindered. Binder Improves Moisture and Abrasion Resistance but Is Destroyed Above 204°C (400°F)
Excellent Excellent Excellent Excellent Fair High Temp. Glass Braid Over Each Conductor, and Binder Impregnated. Overall High Temp Glass Braid Applied and Bindered. Binder Improves Moisture and Abrasion Resistance but Is Destroyed Above 400°F
Excellent Good to
315°C (600°F)
Good to
315°C (600°F)
Excellent Poor Braid of Vitreous Silica Fiber Applied to Each Bare Wire, Then Over Both. Suitable to 982°C (1800°F) if Not Subjected to Flexure or Abrasion
Excellent Good Good Excellent Fair High Temp, Alumina-Boria-Silica Ceramic Fiber Braided Over Each Conductor Then Over Both. Not Recommended for Platinum Thermocouples or Exposure to Molten Tin and Copper, Hydrofluoric or Phosphoric Acids, or Strong Alkalies
Excellent Good Poor Excellent Fair Silica Is a Very High Purity, Chemically Stable Yarn. (SiO2 Content 99%)
Excellent Excellent Excellent Excellent Excellent Color Coded TFE Tape Applied to Conductors and Jacket. Superior Abrasion, Moisture, and Chemical Resistance.


Wire Insulation Identification and Application Guide