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Gimme the Good Stuff

Home > Home Improvement & Yard Work > Is Linseed Oil Toxic?
Is Linseed Oil Toxic? | Gimme the Good Stuff

Is Linseed Oil Toxic?

February 1, 2016 | BY Maia James
This post may contain affiliate links. Please read our disclosure page.

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Written by Maia, Founder & President

We’ve written before about the toxins household furniture releases into our homes (When Furniture Attacks), but mostly have focused on upholstered furniture (check our Safe Sofa Guide for Good Stuff brands).

Toxins in Wooden Furniture

Finding nontoxic wooden furniture can actually be just as challenging as finding a nontoxic sofa, even though you don’t have to worry about flame retardants. Choosing only solid wood pieces is a great start (lots of “wooden” furniture is really made of particle board or plywood which is glued together with formaldehyde-releasing adhesives), but the finishes can be another big problem.

One area of confusion for lots of folks is around linseed oil. Is this truly a nontoxic wood finish, or just Sneaky Stuff?

Here’s the deal with linseed:

Based on our research, we feel that pure, 100% linseed oil poses little, if any, toxic threat to human health, even though it does emit an odor as it dries. Material Data Safety Sheets (MSDS) on linseed oil tell us that it is non-toxic, and various other sources confirm this.

Boiled Linseed Oil

Beware of “boiled linseed oil.”

The confusion around linseed oil arrives when with “boiled linseed oil,” which is what’s found in most stores/home-centers is confused with 100% linseed oil.

Basically, there are three types of linseed oil, two of which are non-toxic.

1) Raw linseed oil is, in fact, flax seed oil. It takes a long time to dry but is entirely non-toxic.

2) The polymerized version is true “boiled” linseed oil, sometimes called “stand oil”. Stand oil is generated by heating linseed oil near 300 °C for a few days in the complete absence of air. Under these conditions, a is highly viscous product results, which provides exceptionally uniform coatings that “dry” to more elastic coatings than linseed oil itself. It also dries much more quickly (although still more slowly than toxic, commonly-used polyurethanes.) This true boiled linseed oil is also non-toxic.

3) The “boiled linseed oil” you can buy in most stores is actually mostly raw linseed oil, but with plasticizers, hardeners, and heavy metals added to make it act like true boiled oil, without the time and effort it takes to actually boil it; in other words, it’s cheap. Folks who are concerned about the toxicity of linseed oil are likely thinking of this type.

We’ve identified two sources for good linseed oil: Heritage Natural Finishes and Earthpaint.

Stay sane,

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Filed Under: Home Improvement & Yard Work, Posts, Non-Toxic Mattresses, Furniture & Decor Tagged With: environmental toxins, wooden furniture

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Comments

  1. Robert says

    July 15, 2017 at 1:17 PM

    This article about the toxicity of boiled linseed oil isn’t very helpful because it doesn’t tell me how to tell the cheap boiled linseed oil from the not so cheap but still nontoxic boiled linseed oil. I still left guessing. Thanks for explaining the rest though.

    Reply
    • Mason says

      May 23, 2018 at 5:08 AM

      Agreed. If you are considering a particular brand of boiled linseed oil and want to make sure it doesn’t have the plasticizers and heavy metals in it, ask the hardware store for the MSDS (Material Safety Data Sheet) if they can’t print you a copy, you should be able to find it online. By law, chemical substances like this have to have an MSDS available before it can be sold to the public—so as to avoid any harmful chemical reactions and to receive classificationfor storage and handling. The MSDS should tell you the list of ingredients, even if the product label doesn’t.

      Reply
  2. Ryan says

    February 20, 2018 at 3:44 PM

    Hi Maia,
    Wonderful article. I’m currently seeking non-toxic Linseed Oil and came across Sunnyside brand. What are your thoughts? I’m concerned as the gallon containers are quite cheap. Do you think they’re honestly non-toxic? http://www.sunnysidecorp.com/product.php?p=cf&b=s&n=873G5

    Thank you.

    Reply
  3. Tharushi says

    August 27, 2018 at 4:32 AM

    Thank you for important information

    Reply
  4. Mark says

    September 19, 2018 at 8:26 PM

    The safety data sheet is linked on the Sunnyside website, and indicates that it is indeed 100% non-toxic pure linseed oil… I bought some and it seems fine

    Reply
  5. Hec says

    October 16, 2018 at 12:21 PM

    Hi,

    I’m considering using boiled linseed oil to seal the floor of a shipping container instead of the Uaual marine epoxy. The goal is to prevent vapors from the floors treated with pesticides escaping into the container, since we are going to live in it. Is anyone familiar with boiled linseed oil used to seal pesticides inside of wood so that the vapors don’t escape?

    Thanks,
    Hec

    Reply
  6. Chris says

    August 10, 2019 at 12:26 AM

    Thanks for the good article and for sharing your thoughts about the toxicity of linseed oil. It is a shame indeed that those oils are sold under the label of a natural oil, mentioning only in the small print that it’s toxic.
    Another issue with the boiled linseed oil is that it tends to ignite and there are quite a few accidents in the US every year: cloth or rugs ignite and cause a fire if they are not properly washed out after applying boiled linseed oil.

    Reply
  7. Dell says

    September 2, 2019 at 10:39 AM

    The link supplied by Ryan is for Sunnyside RAW Linseed oil.
    The Sunnyside BOILED Linseed OIl does indeed contain toxins.
    https://www.sunnysidecorp.com/pdfs/SDS_87216.pdf

    Reply
  8. sean says

    January 26, 2020 at 1:45 AM

    what about Refined linseed oil?thx

    Reply
  9. Esther says

    July 14, 2020 at 5:41 PM

    hi, does anyone know of a brand that IS nontoxic?

    Reply
  10. Chris says

    January 18, 2021 at 8:33 AM

    Thanks for the good info.

    I’m now going to read the material safety data sheet before buying finishes

    Reply

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That’s absolutely not the right idiom (is idiom even what I mean?), but the POINT is that when I take even a few days off I hate working out. Then within two days forcing myself, I’m back to craving fitness daily and hating to miss a session. I always have to remind myself of this when it’s been a few days (or a few weeks!) and I have no motivation. The only way over it is through it! I think that’s the right idiom. 😜
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Maia James, the founder of Gimme the Good Stuff, has a lifetime of experience in the world of natural living, and has turned this passion into a career, now helping clients easily enjoy greener, cleaner lives, peace of mind, and better health.

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