Nashua Heavy Duty FoilMastic Butyl Rubber Tape (360-45)

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4 Reviews
3 Question & Answers
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    View "Full Pricing Table" below for details including case sizes and volume pricing.
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  • Size
    Purchased Most Frequently: 4 in. x 30 ft. (Silver)
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Before ordering, please read the "Product Description & Specs" tab content for more information about this item.

Product Description

This is a heavy-duty rubber tape that has so many uses you'll want to keep some close at hand. Nashua 360-45 Heavy Duty FoilMastic Butyl Rubber Tape is made from 2-mil dead-soft aluminum foil backing with 45-mil butyl rubber mastic adhesive. Nashua 360-45 foil butyl tape is a waterproofing repair tape that can be used to seal low, medium and high pressure indoor or outdoor HVAC duct systems. This includes flexible duct, fiberglass duct, and metal duct systems.

FoilMastic butyl rubber tape is also recommended for repairing everything from trailer panels to shipping containers and more. It's effective as a heavy-duty rubber tape for air leaks on sprinkler systems. Using this rubber tape to fix ducts helps to reduce circulating pollutants and improve indoor air quality.

Please note that Nashua 360-45 and Polyken 360-45 are the same product manufactured by Berry Plastics. Therefore the tape roll core may be branded with Nashua or Polyken, depending on current inventory.

Features and Benefits

  • Permanent sealant
  • Provides instant water tight bond
  • Exceptional adhesion to most materials
  • Conforms to various surfaces
  • Heavy duty all-weather foil coated butyl mastic
  • Non-staining adhesive
  • Paintable 2-mil foil backing can be painted (use as a caulk alternative)
  • Resists cold, heat, sunlight and water
  • Release liner for easy installation
  • Printed for fast identification
  • Can be used on galvanized materials
  • Low VOC content; can help to satisfy EQ Credit 4.1 under LEED® requirements (Low Emitting Materials, Adhesives & Sealants)

Product Applications

For sealing:

  • Seams and cracks in gutters, eaves, roof alleys, hips and ridges
  • Around vent stacks and chimneys
  • Rooftop duct systems
  • Leaks in cars, trucks and vans
  • Around roof installations for small satellite dishes
  • Stone and metal sealing, even in cold weather

For repairing:

  • Mobile homes
  • Gouges, tears and rips in trailer metal panels
  • Metal buildings
  • Shipping containers
  • Poorly sealed connections
  • Ducts (lower utility bills, burn less fuel, improve air quality)
Country of Origin: United States.


Technical Information

Nashua Heavy Duty FoilMastic Butyl Rubber Tape (360-45)
  • Standards Met: UL723; LEED - contributes toward satisfying EQ Credit 4.1
  • Carrier/Backing: 2 mil aluminum foil - printed
  • Adhesive: butyl rubber   How are adhesives different?
  • Release Liner: LDPE (low-density polyethylene) film
  • Thickness: 45 mils (carrier, adhesive) 43 mils (adhesive) 2 mils (carrier)   What is mil thickness?
  • Adhesion: 63 ounces per inch (to stainless steel test panel)
  • Tensile Strength: 20 pounds per inch (longitudinal)
  • Service/Operating Temperature: 40°F to 300°F
  • Core: 3" diameter
  • VOC content: < 1 g/L
  • Country of Origin: United States
Note: Specifications are those given by manufacturers and are not tested for accuracy.

Download Datasheets

The following downloads are available for this product:

Download Product Data Sheet

360-45 Standard sizes


4 in. x 30 ft.

Actual Size: 96mm x 30 ft.

360-45/ 430

UPC = 880812266623

Single Item (1-11 Items)

1 - 4 Cases (12-59 Items)

5 - 9 Cases (60-119 Items)

10+ Cases (>= 120 Items)


a 1% discount

a 3% discount

a 5% discount





6 in. x 30 ft.

Actual Size: 144mm x 30 ft.

360-45/ 630

UPC = 880534148276

Single Item (1-7 Items)

1 - 4 Cases (8-39 Items)

5 - 9 Cases (40-79 Items)

10+ Cases (>= 80 Items)


a 1% discount

a 3% discount

a 4% discount





Question & Answers

[ viewing questions 1 through 3 of 3 total ]
Jake Jan 24, 2022
QUESTION: Is it safe to use inside a heating supply duct? It would be used for sound reduction.
ANSWER: We asked our Berry Plastics rep (parent company of Nashua) and their response was:
"I’m not an HVAC expert and while I think 360-45 would certainly work for the application, for use with ductwork I’d feel more comfortable recommending a UL-approved product. I'd suggest our 360-17 product instead. Thank you."
Bruce Feb 22, 2020
QUESTION: what can I use indoors to seal (waterproof) joints between sections of polyethylene foam insulation for copper hot water pipes?
ANSWER: To seam seal sections of polyethylene foam together can try a line set tape such as Berry 444 (see It is coated with an acrylic adhesive that would offer moisture resistance also. Thank you.
Customer Jan 13, 2018
QUESTION: Will this work on cracks in a cement roof?
ANSWER: If you made the surface perfectly clean and dust free for the adhesive it should work.

User Reviews

[ viewing reviews 1 through 4 of 4 total ]
Terry T. Verified Buyer Mar 09, 2018
trailer tape
Nashua 360-45 Heavy Duty FoilMastic Butyl Rubber Tape
we use the tape to seal holes in trailers works really well
Stephen C. Verified Buyer Feb 20, 2018
Does the job well.
Nashua 360-45 Heavy Duty FoilMastic Butyl Rubber Tape
Does the job well.
Billy Verified Buyer Jan 28, 2017
This is a great product I'd buy this all the time
Nashua 360-45 Heavy Duty FoilMastic Butyl Rubber Tape
I use this product to seal holes in sea going containers as it makes it water tight
Budweiser Verified Buyer Aug 23, 2010
This is one GREAT product
Nashua 360-45 Heavy Duty FoilMastic Butyl Rubber Tape
I pull containers in & out of the port of Savannah, Georgia and sometimes the containers have some small holes in them, so instead of spending 2 or 3 hours sitting in line to get the hole welded up I just put on some of this tape which then makes the container where it will be seaworthy and can be loaded onto the ships to go to there finally destination.
Made in the USA
hot melt rubber (synthetic)
Offers the widest range of application flexibility available. Exhibits excellent processing performance whether manually or automatically applied. Has superior tensile strength, adhesion properties and holding force which ensures consistent, reliable seals. Hot melt adhesive will bond faster to a surface which is referred to as quick-grab or quick-stick. It typically has higher tack (will feel stickier to the touch), but is also softer. It has lower heat resistance, shear resistance, and sometimes UV resistance than an acrylic adhesive. NOTE: it is called hot melt because the adhesive is applied hot by the manufacturer and then hardens as it cools (you do not need to apply heat to the tape yourself).
natural rubber
Properties are similar to that of hot melt rubber, but natural rubber often holds where other adhesives won't (recycled fibers, dust, cold, heat and heavy loads). It provides good overall adhesion and moisture resistance.
Offer excellent performance, especially for applications in temperatures less than 40°F and greater then 120°F. It provides excellent clarity, has high shear strength, is usually more permanent/durable even when exposed to moisture, and it ages well over extended periods in fluorescent and sunlight. Since it remains clear for the life of the application and does not yellow over time it is ideal for applications such as sealing white cartons. While it has good initial adhesion it does take 24-48 hours to cure and to achieve its maximum bond strength (has gradual adhesion buildup). Another difference between hot melt rubber and acrylic adhesive is if you fold tape over making the two adhesive sides touch the acrylic adhesive will remain attached to the carrier (e.g. paper, film) while a hot melt adhesive will stick to itself and pull off of the carrier. It is the best choice for clarity, UV resistance and aging characteristics.
Is great for extreme temperature applications since silicone adhesive can work in continuous operating temperatures from -100°F to 500°F. They also exhibit good chemical resistance, retain electrical properties, and remove cleanly with little or no residue.
zinc oxide
Zinc oxide based adhesive formula is a skin-friendly adhesive which is commonly used on sports medicine tapes.
Thickness, AKA caliper or gauge, refers to the distance from one surface of a tape backing, or adhesive, to the other.
1 mil = 1/1000 of an inch
Examples: 1/16 inch = 62.5 mils; 1/32 inch = 31.25 mils
The cut level indicates how many grams of cutting load a glove can withstand from a sharp blade before being penetrated.
Lower gauge gloves are heavier - have thicker construction, fewer stiches knitted per inch and offer less dexterity.
Higher gauge gloves are lighter - have thinner/finer construction, more stitches knitted per inch and offer more dexterity.
Gloves offered typically runs from 7 to 18 (12 and 13 are in the middle of the scale).
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