Raychem/TE Filler 

Choosing the right filler material in wire harnessing can be polarizing—many question the need for extra weight when every gram counts.

This Raychem/TE-engineered alternative uses a zero-halogen glass twine filament instead of traditional filler wire. It eliminates the guesswork and visual clutter associated with similar-colored wires. Its bright white appearance stands out clearly, even in harnesses with hundreds of conductors.

Filler is measured by its outer diameter in millimeters. Below, we've provided approximate equivalents to Spec 55, M22759/32, and M22759/18 wire sizes. While not exact matches, these sizes are typically within a few tenths of a millimeter.

M22759/32 Filler Cross Reference

• M22759/32-24 AWG (.090 mm): 32-24-Filler
• M22759/32-22 AWG (1.15 mm): 32-20-Filler
• M22759/32-20 AWG (1.40 mm): 32-20-Filler
• Other sizes available upon request

Technical Data

• Tensile Strength: IEC-60811-501, ≥10 N
  Size 5.00-MM to 7.25-MM, 250 mm/min crosshead speed
  
• Elongation: IEC-60811-501, ≥75%
  Size 5.00 mm to 7.25 mm, 250 mm/min crosshead speed
  
• Blocking: No blocking after 24 hours at 100 ± 3°C; tested with five turns and three layers in close contact on a mandrel 10x the filler diameter
• Shrinkage: ≤2% after 4 hours at 100 ± 3°C
  Size 5.00-MM to 7.25-MM only
  
• Out of Round: (Min. Dia./Max. Dia.) × 100 ≥ 90%
• Cold Bend: No cracking after 4 hours at -25 ± 3°C on a mandrel 10x the filler diameter
• Oxygen Index: ISO 4589-2, ≥29
• Temperature Index: ISO 4589-3, ≥250°C
• Smoke Emission: Def Stan 02-711/3, ≥20
• Halogen Acid Gas Content: IEC60754-2
  • pH: ≥4.3
  • Conductivity: ≤10 µS/mm
• Toxicity Index: Def Stan 02-713/3, ≤5