Is Linseed Oil Toxic? The Truth About Linseed Oil
Is linseed oil toxic? I’ve used linseed oil in my own skincare and also on furniture. I’ll be diving in to discuss the benefits and cons of linseed oil.
What Is Linseed Oil?
Linseed oil, also known as flaxseed oil, is a natural oil extracted from the dried, ripened seeds of the flax plant. It is a yellowish oil that has been used for centuries as a wood preservative and finish. The oil is obtained by pressing the seeds, sometimes followed by solvent extraction.
Linseed oil is commonly used as a finish for exterior wood because it is water-resistant and helps protect against weathering and decay. It is also used as a binder in oil paints and as a component in linoleum flooring.
Is Linseed Oil Toxic?
Linseed oil is a natural oil derived from flax seeds and is common in household products, but is it toxic? Let me explain.
Potential Toxicity of Linseed Oil
Based on Material Data Safety Sheets (MSDS) on linseed oil, it is considered non-toxic. However, there are certain cases where you need to be extra careful or else it can become potentially toxic.
- When It Dries: Linseed oil can emit an odor as it dries. This can cause respiratory irritation for some people.
- Skin Irritant: Linseed oil can also be a skin irritant. Long exposure to it can cause skin dryness and cracking.
- Flammability: Linseed oil and self-combust when exposed to high temperatures. So just make sure to put it in a cool dry place.
Takeaway: Linseed oil is non-toxic but you’ll need to take follow safety precautions in order to use it safely.
Types of Linseed Oil
The main three types of linseed oil are:
Raw Linseed Oil
Raw linseed oil is the purest form of linseed oil. It’s also known as flaxseed oil. It is extracted through cold pressing of the flax seeds. Raw linseed oil is non-toxic and safe to use.
Polymerized Linseed Oil
Polymerized linseed oil is produced by heating raw linseed oil to close to 300°C. It’s also known as “boiled linseed oil” or “stand oil”.
This type of linseed oil dries faster than raw linseed oil and dries harder than raw linseed oil when cured.
It may be hard to apply polymerized linseed oil on large surfaces because it cures so fast, but it works well for smaller surfaces.
Boiled Linseed Oil
Boiled linseed oil is similar to polymerized linseed oil in that it is produced by heating raw linseed oil with metallic driers. However, boiled linseed oil is not heated as long as polymerized linseed oil, so it dries slower and is less durable. Boiled linseed oil is commonly used in woodworking and as a finish for furniture.
It usually takes around 1 day for BLO to dry.
What Is Linseed Oil Used For?
Linseed oil can be used in a variety of ways. Let’s talk about what it’s most commonly used for. Consider these ideas for your next DIY project!
Woodworking
Woodworking is one of the most common ways linseed oil is used. It’s a much better natural alternative to synthetic finishes. How it works is the linseed oil penetrates deeply into the wood which enhances the wood’s natural grain and color.
It also naturally provides a protective layer that helps to prevent water damage, scratches, and other types of wear and tear.
Lubricant
Linseed oil is a natural lubricant that is used in various applications. The most common place it’s used is the manufacturing of leather products such as shoes, belts, and bags. It is also used as a lubricant for machinery and other mechanical components.
Nutritional Supplement
Linseed oil isn’t just used in building things but it’s also used in food and skincare products! That’s because it’s a rich source of omega-3 fatty acids.
I’ve seen a ton in nutritional supplements as well. I normally see it in capsule form and it’s used to support heart health, reduce inflammation, and improve cognitive function.
Another place it’s used in is skincare and makeup products like a serum, cleansers, or even tinted moisturizers.
Painting Binder
I’ve also seen linseed oil as a common ingredient in oil-based paints. It is used as a paint binder and helps to improve the flow and leveling of the paint. When mixed with pigments, it creates a smooth and glossy finish.
Putty Filler
Linseed oil is also used as a putty filler. It is mixed with whiting powder to create a paste that is used to fill gaps and cracks in woodwork.
Environmental Impact
Pure linseed oil is good for the environment because it’s biodegradable. However, boiled linseed oil and polymerized linseed oil are both not biodegradable because they contain metallic dryers.
Final Thoughts: Is Linseed Oil Toxic?
Pure linseed oil used in foods or skincare is safe to use. However, when it comes to furniture, it’s best if you try to prioritize using pure linseed oil. If it’s not suitable, then try using polymerized linseed oil.
Frequently Asked Questions
Is linseed oil toxic to animals?
Linseed oil is non-toxic for animals, including dogs, cats, rabbits, horses, fish, chickens, bees, and birds unless it’s boiled.
Is linseed oil toxic to plants?
Linseed oil is not toxic to plants and can be used as a natural pesticide to repel insects. However, don’t apply too much since it can damage their growth.
Is linseed oil safe to eat?
Linseed oil is safe for consumption. However, boiled linseed oil is not because it’s been treated with chemicals.
Is Tung oil toxic?
Tung oil is non-toxic and safe to use. It is often used as a natural wood finish and is an alternative to linseed oil.
Is linseed oil toxic for painting?
Linseed oil is a common ingredient in oil-based paints and is not toxic when used as directed. However, inhaling boiled linseed oil fumes can cause respiratory issues. Excessive skin contact with linseed oil can also cause skin irritation.
Is boiled linseed oil toxic even when dry?
Boiled linseed oil is toxic when ingested and can cause severe health issues. However, once the oil has dried and cured, it is no longer toxic.
Is refined linseed oil toxic?
Refined linseed oil is non-toxic and safe to use. It is often used in food products and cosmetics.
Is raw linseed oil toxic?
Raw linseed oil is non-toxic and safe to use. It is often used as a natural wood finish and is an alternative to boiled linseed oil.
Is oxidized linseed oil toxic?
Oxidized linseed oil is not toxic, but it can become rancid and emit an unpleasant odor. It is not recommended for use in food products or cosmetics.
Is walnut oil less toxic than linseed oil?
Walnut oil is non-toxic and safe to use. It is often used as a natural wood finish and is an alternative to linseed oil.
Before you go… check out these related articles (they all use linseed oil!)
