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) |
-40 to 105°C -40 to 221°F |
Good | Excellent | Good | |
FF (Extension Grade-EXFF) |
FEP PFA or Neoflon |
FEP PFA or Neoflon |
-200 to 200°C -338 to 392°F |
Excellent | Good | Excellent | |
TT (Extension Grade-EXTT) |
PFA PFA or Neoflon |
PFA PFA or Neoflon |
-267 to 260°C -450 to 500°F |
Excellent | Good | Excellent | |
KK | Kapton | Kapton | -267 to 260°C -450 to 500°F |
Excellent | Good | Good | |
TG | Glass Braid |
PFA PFA or Neoflon |
-73 to 260°C -100 to 500°F |
Good | Good | Excellent | |
GG (Extension Grade-EXGG) |
Glass Braid |
Glass Braid |
-73 to 482°C -100 to 900°F |
Poor | Good | Poor | |
HH | High Temp Glass Braid |
High Temp Glass Braid |
-73 to 704°C -100 to 1300°F |
Poor | Good | Poor | |
XR | Refrasil Braid |
Refrasil Braid |
-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 |
-73 to 1204°C -100 to 2200°F |
Poor | Good | Poor | |
XS | Silica | Silica | -73 to 1087°C -100 to 1990°F |
Poor | Good | Poor | |
TFE | TFE PFA |
TFE PFA |
-267 to 260°C -450 to 500°F |
Excellent | Good | Excellent |
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. |