3M™ Scotchrap™ Tapes 50, 51 and Pipe Primer, 3M™
Scotchfil™ Electrical Insulation Putty,
All-Weather Corrosion Protection
Data Sheet
Description
May 2013
3M™ Scotchrap™ Tapes 50 and 51 are tough, polyvinyl chloride based tapes with
special high tack adhesives formulated to resist corrosion of metal piping systems
above and below ground, fittings and joints on all mill-coated pipe and electrical
conduit systems. These tapes are:
Resistant to corrosive salt water, soil acids, alkalies and salts, common
chemicals, chemical vapors, and exposure to outdoor weathering and sunlight.
Resistant to impact, abrasions, punctures, and tears. Tape 50 is highly
conformable, all-weather 10 mil (0,254 mm) thick tape designed for application
over a wide temperature range. Tape 51 provides similar qualities in a thicker,
20 mil (0,508 mm) tape. Both tapes have electrical insulating properties.
3M™ Scotchrap™ Pipe Primer is a quick-dry, non-sag rubber base primer that
permeates metal surface pits and irregularities, preparing the surface for tape
application. The primer is compatible with the special adhesives on these tapes, as it
enhances adhesion.
3M™ Scotchfil™ Electrical Insulation Putty is used as a build-up compound on highly
irregular surfaces such as fittings and valves, providing a smooth, waterproof taping
surface. The putty is soft and pliable – simply press putty into place on irregular
surfaces, mold with finger pressure and over tape using standard methods.
Application of
Primer, Putty and
Tape:
The Scotchrap Tapes 50 and 51 are easy to apply without special tools or dangerous
flame. However, a few general application procedures should be followed to obtain
optimum performance. Surfaces to be wrapped should be clean, dry and free of oil,
grease, and other contaminants. Blast removal of rust and scale is preferred.
Welding slag and spatter, sharp edges or burrs should be chipped, grinded or filed.
Apply a uniform, continuous coating of the pipe primer to the prepared surface and let
dry. Fill in irregular surfaces with the putty. Cover weld bead with one wrap of tape
over the entire surface.
Straight pipe and conduit are normally spirally wrapped using tape width listed in
coverage table. Field joints on mill-coated pipe can be wrapped spirally or with a
cigarette wrap or wide tape. Unusually severe construction or soil conditions may
require additional tape thickness or protective overwraps.
1 of 4
3
3M™ Scotchrap™ Tapes 50, 51 & Pipe Primer, 3M™ Scotchfil™ Electrical Insulation Putty
Application of
Primer, Putty and
Tape, continued
For below ground installation adequate provision should be taken to protect the
coating from physical damage during pipe handling, lowering or backfilling operations.
Typical Properties
Not for specifications. Values are typical, not to be considered minimum or maximum.
Properties measured at room temperature 73°F (23°C) unless otherwise stated.
The pipeline ditch should be free of rock or other sharp objects so the coated pipe
rests on a smooth bed of soil. Backfill materials should also be free of rock or other
sharp objects to avoid damage of the coating. After layer of debris-free soil has
covered the pipe, general backfill may be used.
3M™ Scotchrap™ Pipe Primer
Property
Typical Value US units (metric)
Color
Black
% Solids
30
Weight
7lbs. /gal. (0.84 kg/litre)
Coverage
@ 1 mil (0,025 mm) dry film thickness
Drying Time
@ 75°F (24°C) and 50% RH 1 mil (0,025 mm)
dry film thickness
700 sq. ft. /gal. (17.4 m2/litre)
15 min.
19°F (-7.2°C)
Flash Point
3M™ Scotchfil™ Electrical Insulation Putty
Property
(Test Method ASTM D-1000 unless otherwise stated)
Color
Typical Value
US units (metric)
Black
Thickness
125 mils
Elongation
1000% min.
Dielectric Strength
575 V/mil
Insulation Resistance
>1 x 106 Ω
3M™ Scotchrap™ Tapes 50 and 51, All-Weather Corrosion Protection Tapes
Property
(Test Method ASTM D-1000 unless otherwise
stated)
50 Tape
US units (metric)
51 Tape
US units (metric)
Classification Specification L-T-1512A
(Federal)
Type III
Type II
Color - Backing
Black
Black
Color – Adhesive
Black
Black
Thickness
10 mils (0,254 mm)
20 mils (0,508 mm)
Elongation @ Break
10°F (-12°C)
74°F (23°C)
100%
200%
100%
150%
Breaking Strength
20 lb./in. (3,5 kN/m)
40 lb./in. (7,0 kN/m
Adhesion to Steel
10°F (-12°C)
74°F (23°C)
30 oz/in (0,328 kN/m)
20 oz./in (0,219 kN/m)
30 oz/in (0,328 kN/m)
20 oz./in (0,219 kN/m)
Adhesion to Backing
10°F (-12°C)
74°F (23°C)
30 oz/in (0,328 kN/m)
20 oz./in (0,219 kN/m)
30 oz/in (0,328 kN/m)
20 oz./in (0,219 kN/m)
Roll Unwind
10°F (-12°C)
74°F (23°C)
16 oz/in (0,175 kN/m)
16 oz/in (0,175 kN/m)
16 oz/in (0,175 kN/m)
16 oz/in (0,175 kN/m)
2 of 4
3M™ Scotchrap™ Tapes 50, 51 & Pipe Primer, 3M™ Scotchfil™ Electrical Insulation Putty
Typical Properties,
continued
Not for specifications. Values are typical, not to be considered minimum or maximum.
Properties measured at room temperature 73°F (23°C) unless otherwise stated.
3M™ Scotchrap™ Tapes 50 and 51, All-Weather Corrosion Protection Tapes,
continued
Property
(Test Method ASTM D-1000 unless otherwise
stated)
50 Tape
US units (metric)
51 Tape
US units (metric)
Water Vapor Transmission Rate
(ASTM D-3833)
g/100 in2 (645 cm2) /24 hrs
1.0
1.0
Moisture Absorption (ASTM D-570)
.30%
.35%
Resistance to Weathering (3M)
Weatherometer
100 Hrs.
100 Hrs.
Dielectric Break Down Voltage
12,000 volts
20,000 volts
+10°F to 150°F
(-12°C to 65.6°C)
+10°F to 150°F
(-12°C to 65.6°C)
-55°F to 175°F
(-48°C to 80°C)
-55°F to 175°F
(-48°C to 80°C)
Normal Application
Temperature Range
Normal Service
Temperature Range
Note: For 3M™ Scotchrap™ Tapes 50 and 51 to work properly, all metal surfaces must be coated with
3M™ Scotchrap™ Pipe Primer before wrapping with the tape.
Tape Width
# Rolls per Square
1”
12
2”
6
4”
3
6”
2
12”
1
All widths are in 100 ft. rolls. 1 square = 100 sq. ft. (i.e., a roll 1 ft. wide x 100 ft. long)
To convert to rolls, multiply the number of squares by the number of roll/square from the above tables
3M™ Scotchrap™ Tapes 50 and 51, All-Weather Corrosion Protection Tape – Pipe Coverage Table
Paper Size
Squares of Tape for 100 Linear Ft. Pipe
Nominal I.D. (Inches)
O.D. (Inches)
Suggested Tape Width
Minimum Overlap 1/2”
Half-Lapped
1/2
0.84
1
0.44
0.44
3/4
1.05
2
0.37
0.55
1
1.32
2
0.46
0.69
1-1/4
1.66
2
0.58
0.87
1-1/2
1.90
2
0.66
0.99
2
2.38
2
0.83
1.25
2-1/2
2.88
2
1.00
1.51
3
3.50
4
1.05
1.83
3-1/2
4.00
4
1.20
2.09
4
4.50
4
1.35
2.36
5
5.57
4
1.59
2.92
6
6.63
6
1.89
3.47
7
7.63
6
2.18
3.99
8
8.63
6
2.46
4.52
10
10.75
6
3.07
5.63
12
12.75
6
3.64
6.67
14
14.00
6
4.00
7.33
3 of 4
3M™ Scotchrap™ Tapes 50, 51 & Pipe Primer, 3M™ Scotchfil™ Electrical Insulation Putty
3M™ Scotchrap™ Tapes 50 and 51, All-Weather Corrosion Protection Tapes – Pipe Coverage Table, cont.
Paper Size
Squares of Tape for 100 Linear Ft. Pipe
Nominal I.D. (Inches)
O.D. (Inches)
Suggested Tape Width
Minimum Overlap 1/2”
Half-Lapped
16
16.00
6
4.57
8.37
18
18.00
6
5.14
9.42
20
20.00
6
5.71
10.47
22
22.00
6
6.28
11.51
24
24.00
6
6.85
12.56
26
26.00
6
7.42
13.61
28
28.00
6
8.00
14.65
30
30.00
6
8.56
15.70
36
36.00
6
10.28
18.84
While the chart gives coverage data for most common sizes, the following formula may be helpful for non-standard items:
Squares of Tape =
(LP) ( (DP) TW
When using metrics,
Primer Coverage
1200 (TW-OV)
Squares of tape =
1 gallon of 3M Scotchrap Pipe Primer will
cover up to 700 sq. ft., depending on the
surface condition of the pipe. To calculate
area of pipe for primer coverage:
(LP) ( (DP) TW
9290 (TW-OV)
Where
= 3.14
LP = length of pipe (ft.)
DP = outside diameter of pipe (in.)
TW = tape width (in.)
OV = overlap of tape (in.)
Metric Conversions
1 inch = 25,4 millimeters
1 foot = 0,3048 meter
1 sq. ft. = 0,092 sq. meter
1 gallon = 3,785 liters
Sq. ft. of pipe =
(DP ÷ 12) (LP)
Shelf Life & Storage
These products have a 5-year shelf life from date of manufacture when stored in a
humidity controlled storage (10°C/50°F to 27°C/80°F and