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
Marking on Surface	―
Available colors	Black
Flexibility	Flexible
Environmental Compliance	RoHS,ELV
Industry	Automotive,Construction machinery,Industrial machinery,Electronics

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

Gasoline

Gas oil

Lubricant

Alcohol

Acid

Alkali

△

○

△

Features

Properties	Items	Requirements	Typical values*1
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

Properties

Items

Requirements

Typical values*1

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

*1: For reference use only *2: Calculated by using outer cross section

Sizes

Trade size（mm）	As supplied（mm）	After recovered（mm）			Unit length （min.）（m）
Trade size（mm）	Inside diameter（min.）	Inside diameter（max.）	Wall thickness^＊1	Adhesive thickness（nom.）	Unit length （min.）（m）
4/1	4.00	1.00	1.00 ± 0.30	0.50	1.22
8/2	8.0	2.00	1.00 ± 0.30	0.50	1.22
16/4	16.0	4.00	1.80 ± 0.40	0.80	1.22
24/6	24.0	6.0	2.50 ± 0.50	1.00	1.22

*1: Including inner adhesive