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As the name implies, this material is made by milling fiberglass into a very thin consistency. This material is used in preparing a structural filler. This material is used in fillets that require structural integrity. Milled fiber fillers have higher strength than cotton flock but have fine particles of fiberglass that can penetrate the skin.


Add to epoxy resin to strengthen glue joints. Mixes easily and works great.

Eric B Verified Purchase


August 24, 2021

Imp A Verified Purchase


July 15, 2021

Milled glass is absolutely necessary in composite construction and repair work. AS&S has what us home builders need -Always. Great Company and Great People.

Chuck C
November 20, 2020

No information on what fiber lengths, though, like some other vendors. The bag looks like powder- I was thinking it would be longer fibers on the presumption that longer fibers = greater strength. Will test it and see if it is strong enough for my casting application despite the apparently microscopic fiber length.

February 19, 2019

Great price and exactly what I was looking for regarding milled fibers. They shipped quickly. No issues, thank you!

Happy C
October 11, 2018

Exactly what I expected. One should plan using milled fiberglass - my application is internal for strength (compressive). Laminating epoxy is better for use with this product. I suggest testing before application so you will have planning and expectations set prior to intended use.

May 6, 2017

This is the first time I have used this product. I needed to make a structural fairing compound and it performed well for the task using West System epoxy. The milled fiberglass is more of a powder than chopped strands of fiberglass.

Richard C
February 18, 2020


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Hello what's the weight of this bag?

This is a one pound bag.

Q: What is the fiber length: 1/32", 1/8", other? Thanks

The fiber length is 1/32".

Q: What is the diameter of the milled glass fibers?

The tech data sheet call out a 1/32" screen size. This is the only available information we can go off of.

Q: What is the style of the milled glass fibers? I am looking for Style 731 AA or 731 ED.

We stock the 731 ED material.

Q: Can you supply the MSDS & C of C's with 731-ED-1/32 Milled glass fibers? Part # 01-14780

Yes, both documents can be supplied. MSDS can be supplied at no charge. Request it in special instructions at checkout. C Manufacturer C of C can be supplied for $15. Must be requested in the shopping cart. First click the button on top of the cart for "Certification Required", then scroll to the glass fibers Part # and select the check box for "Add Certification Paperwork ($15.00)".

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