Duct Tape

Doug Mahoney did extensive testing of duct tape.
See The Best Duct Tape | The Sweethome
He recommends Duck Brand 240201 MAX Strength Duct Tape
His test results

Brand	Thickness	Material Strength	Adhesion (Wood)	Adhesion (Masonry)
Duck Max Strength	11.5	62 lbs	50 lbs	56 lbs
Scotch All-Weather	9 mils	51 lbs	47 lbs	38 lbs
Duck Advanced	9 mils	38 lbs	38 lbs	28 lbs
Intertape AC36	11 mils	45 lbs	45 lbs	35 lbs
Nashua 398	11 mils	46 lbs	46 lbs	46 lbs
Heavy Duty
Gorilla	17 mils	101 lbs	89 lbs	82 lbs
Polyken 231	12 mils	85 lbs	85 lbs	66 lbs
Sticky Ass Tape	13 mils	80 lbs	80 lbs	50 lbs
Nashua 357	13 mils	88 lbs	88 lbs	77 lbs
T-Rex	17 mils	80 lbs	64 lbs	74 lbs

Scotch Duct Tapes at NRHA

Type	Strength	Use
Heavy Duty All-Weather		- Indoor and outdoor repairs - Heavy-duty patching - Masking rough surfaces - Long-lasting repairs
Transparent		- Patio furniture - Children's toys - Decorations - Home electronics
No residue		- Bundling garden hoses - Securing cords - Hanging vinyl banners - Securing floor mats
Pro Strength		- General repairs - Industrial and HVAC applications - Hanging poly sheeting - Wrapping pipe insulation
Multi-use		- Holding, securing and bundling - Temporary repairs - Regripping handles - Reinforcing
Colored		- Color coding - Color matching - Decorating - Temporary repairs
Extreme Hold
Outdoor Painter's Clean Removal
Poly Hanging & Tarps

Strength is a combination of two factors: peel adhesion (the "stickiness" of the tape) and tensile strength (the "sturdiness" of the tape).
Weatherability is the degree to which the tape avoids drying and cracking and holds up when exposed to the sun, wind, moisture and extreme temperatures.

Links:

Scotch® Tough Duct Tape 
  
Products: DIY Website Product Catalog

  
Scotch Tough Duct Tape | How Tough Is Your Tape?
  
Scotch Duct Tapes at  NRHA

The Best Duct Tape | The Sweethome

last updated 26 Feb 2015