FROTH-PAK™ 650 Spray Foam Sealant Kit, 650 sq ft, 15 ft Hose

KTDW 65010
Please note: A reformulated version of this product will become available by mid-May 2021.
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This is Class A fire rated closed cell foam which means that the sprayed foam can be left exposed up to 2 inches thick in certain applications.


Use by Date? No worries. We guarantee you the freshest product every time you order. 

This kit is intended for residential and commercial applications.  Please use the appropriate personal protection equipment when applying this product and follow all manufacturer instructions on safety, use and disposal.


FROTH-PAK™ 650 Class A fire rated spray foam insulation kits are complete portable two part polyurethane spray foam systems. FROTH-PAK™ polyurethane foam is a two-component, quick cure, closed cell foam that fills cavities, cracks and expansion joints for insulation and air sealing. Air infiltration accounts for 25%-40% of a home’s energy loss, FROTH-PAK™ stops that energy loss. FROTH-PAK™ Foam Insulation kits can be used to insulate stud wall cavities up to 2" thick, cold floors above unheated areas, crawl spaces, attic walls, and ceilings when covered with a code-approved barrier. The kit can be restarted and reused for up to 30 days after first startup. The FROTH-PAK™ 650 kit yields up to 650 board feet of foam.

The FROTH-PAK™ 650 kit yields up to 650 board feet of foam (One board foot = 12"x12"x1"), 1.75 foam density.

FROTH-PAK™ provides a R-6.6 rating per 1 inch of thickness when sprayed at 2 inches thick.



  • Part A Tank(60 pounds) - Isocyanate
  • Part B Tank(60 pounds)  - Polyol
  • 15 feet hose 
  • INSTA-FLO Gun Dispenser & Hose Assembly
  • Cone Spray Anti-Crossover Nozzles (8 cone nozzles, 4 fan nozzles)
  • 1 Wrench (5/8")
  • 1 Petroleum Jelly Packet (5 g)
  • 1 Operation Instruction Manual

Chemical curing allows 2 part polyurethane foam to be dispensed, expand, and become tack free in seconds. Foam will skin over in 30 to 40 seconds. Reentry to spray area can be made in 1 hour without respirator.  Dow FROTH-PAK™ 650 is great for bigger jobs; yield is 650 board ft.


FROTH-PAK™ Foam Insulation Kits (U.S. only) come with a Class-A fire rating (flame spread index of 25 or less), FROTH-PAK™ Foam Insulation can be used in:

  • Stud wall cavities
  • Rim or band joists
  • Crawl space walls and ceilings
  • Attic ductwork
  • Plumbing wall pipe insulation and support

Please refer to your local building code or local inspector for proper application.

Use by Date? - No worries. We guarantee you the freshest product every time you order.


Due to state regulations, this product is not currently available for use in CA, CO, WA, NY, VT, MA, NJ

FROTH-PAK™ spray foam kits are intended for professional use - Please follow all instructions and guidelines for use and application.

Personal Protection Equipment (PPE) should be used when applying FROTH-PAK™ foam kits.

Dow Personal Protection Equipment Recomendations

Dow Froth Pak Safe Handling Instructions

FROTH-PAK™Usage Recomendations

As with all chemical products proper preparation of the work area and application procedures should be followed to insure a safe and satisfactory job.

When spraying FROTH-PAK™, the initial reaction of the 2 chemicals will generate heat. We recommend building up thickness in a series of layers to avoid excessive heat buildup. 

Proper ventilation of the work area should be followed. Please see Froth Pak Ventalation Guidelines.

Please make sure that both tanks are opened fully and that there are no restrictions in the feed lines. An improper mixture will cause "off ratio" foam. To see what this looks like check out our video "How to tell Good from Bad"

FROTH-PAK™ Handling and Disposal

Froth Pak Temperature Guidelines

Froth Pak Disposal Instructions

OSHA Work Rules

For contracters  and businesses OSHA has specific guidelines for applying spray foam. Please see the following for more information:

National Emphasis Program (NEP) for Occupational Exposure to Isocyanates

FAQ on OSHA'S NEP program


Additional charges may apply if shipping to a residence, extended service area, or business that does not have a loading dock.
This product is also available for Pick Up from our Farmingdale, NJ warehouse.

8 Reviews

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  • 5
    love the end results

    Posted by Daren T on Aug 7th 2018

    Very happy with the results. I should have bought all 3 kits. I knew 2 would cover the area, but, I also knew it would be thin towards the end. Honestly I was nervous about trying it. I figured a 1400 dollar oops is better than a 2100 dollar oops. Towards the end of the spray you need to pay attention to the color of the foam. the blue hose seems to run out first. I had a spot about 1 sqft that was more brown than surrounding foam. I let it dry and easily scraped it off with my finger so I can reapply over that area. Over-all I am very happy with the results. Definitely cover as much skin as possible. use a full tyvex suit, goggles (regular glasses leave your eyes too open to the floating particles of foam) and gloves. I would buy this again.

  • 5
    Froth 650 Pak

    Posted by DB on May 2nd 2018

    Great way to seal and achieve high R-values. Went with a couple inches along rim board. Shipped same day I placed the order. Do yourself a favor and watch some of the training videos Dow provides online and read the manual. You'll see some (non-DOW) videos of people spraying with a dust mask or even without respiratory protection. Don't do it. This can be safely and efficiently applied for great results...just follow the manufacturer's recommendations and use safety precautions.

  • 4
    Froth 650 review

    Posted by Unknown on Oct 24th 2016

    The company hustled to get me the product the next business day, much appreciated (though FedEx tried to sabotage the delivery). Application went fine though spraying up to coat the underfloor of a crawl space is not so much fun. Wear your bunny suit and respirator!

  • 4
    Foam-Pak 620

    Posted by Ged on Oct 11th 2013

    Product was delivered 2 days after order was placed,exceptional. I used this to insulate a sub floor resting on a concrete base and theFoam-Pak 620 fullfilled this need. It was easy to use carfully following the instructions. I used up the entire contents in one go so cannot comment on storage and re-use. One down side is that it did no go as far as I expected. The 620 board feet (1.4 cu m)listed is theoretical in ideal lab conditions. I would like to know what the practical volume usage is.

  • 4
    good product.

    Posted by Unknown on Oct 1st 2013

    had a small problem with the left hose at the sprayer that seeped some material out. wasn't a big deal though. product sprays and covers well. make sure they are warm like the instructions explain or inconsistent coverage. warmed mine up and worked great. once applied, this product is amazing, like most any spray foam.

  • 4
    sprays beautifully

    Posted by Unknown on Aug 23rd 2013

    and besides that it is easy to use--you really have to plan what your doing so you don't have to change nozzles all the time