SUMITUBE™ W3B2 (4X)

CatalogNo.891

[Dual wall, flame-retarded heat-shrinkable tubing with meltable adhesive for waterproofing of irregular-shaped objects]UL recognized

■ SAE/UL recognized
■ Watertight sealing with good adhesion to metals, polyolefin and PVC
■ Effective for waterproofing of irregular-shaped objects
■ Flame-retarded (PBDE/PBB-free)
■ Flexible
■ Thicker adhesive (than SUMITUBE™ O2B2)
✔RoHS directive 10 substances

Applications

■ Waterproof sealing for electronic devices with irregular shapes or profiles
■ Encapsulation for wire branches
■ Insulation and protection for wire joints

Basic Properties

Category Heat shrink tubing
Material

Outer : Irradiated cross-linked flexible flame-retarded polyolefin

Inner : Meltable adhesive
Flammability Flame Retarded
Shrink temperature min. 110℃
Shrink ratio min. 75%
Longitudinal change -15 to 5%
Continuous operating temperature -55 to 125℃
Specifications/Approvals

UL224

　　File No. E75077

　　Catalog No. SUMITUBE™ W3B2 (4X) or 891

　　Rating temperature: 125℃

　　Rating voltage: 600V

SAE-AS23053/4 Class 3
Available colors Black
Flexibility Flexible
Environmental Compliance RoHS,ELV
Industry Automotive,Construction machinery,Industrial machinery,Electronics

Oil/Chemical resistance (room temperature)

Gasoline Gas oil Lubricant Alcohol Acid Alkali
△ △ △ ○ ○ △

◎：Very good　○：Good　△：Not applicable in some cases

Properties Items Requirements Typical Values *
Mechanical Tensile strength*2
Elongation
Cold impact
Heat shock		 min. 10.4MPa
min. 250%
-55℃ x 3 minutes, no crack
250℃ x 4 hours, no crack		 14.4MPa
472%
Pass
Pass
Electrical Dielectric strength
Volume resistivity		 min. 11.8kV/mm
min. 1014Ω・cm		 41.1kV/mm
2.11 x 1015Ω・cm
Chemical

Water absorption
Corrosion against bare copper
Color stability
Fluid Resistance

　Tensile strength
　Dielectric strength
Flammability (UL224)

 23℃ x 24 hours, max. 1.0%
121℃ x 16 hours, no corrosion
175℃ x 24 hours, no change
After immersion in the fluids specified in
SAE-AS23053 at 23℃ for 24 hours,
min. 6.2MPa
min. 7.9kV/mm
Flame-retarded, pass, all tubing flame test

0.49%
Pass
Pass

 

10.4MPa
38.1kV/mm
Pass

Sizes