3m Glass Bubbles

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Overview

These K-20 series bubbles are actually hollow glass spheres. Because this high-quality glass is very crush resistant, the foam is much stronger, stiffer and water-resistant than any foam made by chemical foaming. These foams displace 4-6 times their weight in most resins and improve the handling characteristics of the base resin. They have a low bulk density and are nontoxic. Mix resin and hardener as directed, then fold in the glass bubbles. Upon cure, a strong, low-density product results which is easy to sand and file. May be shaped to form compound angles and curves.

The term "micro" was applied to the mixture of microspheres and epoxy early in the development of composite structures. Although microspheres have been replaced by glass bubbles the word "micro" is still commonly used to reference the mixture. "Micro is used to fill voids and low areas, to glue foam blocks together and as a bond between foams and glass cloth. Micro is used in three consistencies - (1) a "slurry" which is a one-to-one by volume mix of epoxy and glass bubbles, (2) "wet micro" which is about two to four parts glass bubbles by volume to one part epoxy, and (3) "dry micro" which is a mix of epoxy with enough glass bubbles to obtain a paste which will not sag or run (about five parts to one by volume). In all instances, glass bubbles are added to completely mixed epoxy resin and hardener. Wet micro is used to join foam blocks and is much thicker than slurry (it has the consistency of honey) but can be brushed. Dry micro is used to fill low spots and voids and is mixed so that it is a dry paste and will not sag. Apply with a putty knife. Never use micro between glass layers.

CAUTION - When mixing epoxy and glass bubbles, wear a dust mask and keep your face away from the balloons that may float up into the air. Although glass balloons are inert, they can lodge in your eyes or in your lungs and cause problems. Handle with care.

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Chris D 15.07.2019	I use this product mostly as a lightweight filler. I also appreciate that this is shipped double-bagged.
Clay 25.04.2019	Using EA9309NA with the beads to create a smooth filler and matt application for a repair with Vac bagging, works great.
Darrell 14.04.2019	Upon the recommendation of other guys in the classic car hobby, I used these beads to make a heat and sound insulating paint for the floor of my old Dodge. It mixes very well and goes on nicely. I wont know how well is works for a while yet, but I know from the testimony of others, that it does indeed make a huge difference. Thank you.
Buck S 09.03.2019	Glass Bubbles make your epoxy light and stiff to hold shape (Micro). For structural uses Flox is much stronger.
Andrew A 27.09.2018	As usual, Aircraft Spruce shipped fast with excellent packaging and for a great price. This 5 lb bag of micro is very white and light with no clumping. I really like it! The 5 lb represents many hours of sanding on my Cozy, so I resent this product as much as I like it.
Pk 08.09.2018	Quirky, great thing about Aircraft Spruce - they always send just a little bit more than the ordered quantity. The 1 lb bag was 1 oz over, and the 5 lb bag shipped at 2.2 oz over. Now back to building the Cozy....
Greg L 06.09.2018	As expected, extremely fine.
Nick 20.05.2018	Fine powdery bubbles, kinda like dry flour. Mix a little or a lot into epoxy to control viscosity for fillets.
Lollo 16.03.2018	Super fast delivery and excellent product! Thanks! Did I forget best price as well???? :)
James E 24.11.2017	I have used a lot of this on the construction of my Velocity and it has worked great from lay-ups with micro in the radius to filling and sanding to primer. The packaging is great! double bagged to stop loss from handling. I will continue to use this until my plane is done..
Charlie E 09.11.2017	Good product. Prompt delivery and well packaged.
Ed B 19.10.2017	Works well with the EZPoxy for student composite projects.
Fritz M 21.09.2017	I am using this product now to thicken my two part epoxy for structural wood. I previously used a similar product sold by ACS but appears to have been discontinued or not available. Although I preferred the previous filler to this product, this product does the job by forming a milk colored glue that works just fine. Take somewhat more of this filler than the previous product I refer to. Sorry, I cannot remember the previous product name, but should be on my records with ACS.
Lorenzo R 25.08.2017	Best price around! Thank you
Charles K 14.08.2017	ok!!thanks
Uncle A 20.04.2016	I mix microbubbles with architectural epoxy as part of the internal and external seals on long term survivable messages in bottles in the Southern Sea. The syntactic foam is destructively tested to be exceptionally resistant to seawater and sunlight (Ozone Hole! UV cleaves ordinary epoxy resin in two places/molecule).
Dwight 22.10.2019	Good source of micro spheres at fair price with fast shipping.
Modesto V 15.10.2019	Liked this product and have always used glass bubbles with fiberglass and it is a great product
Al S 28.01.2020	This is a superb low density epoxy filler (ArtResin - strong bonding, syrup initial viscosity) at a low price/volume (about 30% void space fill for a thick paste). The spherical filler allows high solids loading for a given final viscosity. ALWAYS PRE-MIX THE EPOXY! Add filler, mix carefully (dusting), pause to allow the epoxy to wet, then mix some more (dilatant fluid). Patience.
Bill M 04.04.2020	Received in good condition. Micro balloons for Hysol work on my Kitfox.
Thomas N 10.05.2020	Too pricey, but stuff!
Thomas N 03.06.2020	works!
Dale M 30.07.2020	Always clean and dry. Same great product that Aircraft Spruce always offers.
Michael G 04.09.2020	Exactly what I was looking for. Great packaging! Arrived quickly and no damage
Chuck C 20.11.2020	IÃ¢??ve been a customer of AS&S since 1982. They have what us homebuilders need Always. This product is essential to composite construction. Great value .