Fabric Guide

Detailed information about how textiles affect your health— plus a rating system you can use to keep it all organized.

Fabric Ratings

I use these rating scales to stay consistent and unbiased as I rank products in the Interior Medicine shop from healthiest to least healthy. You can also use it as a guide when choosing fabric, upholstery, and other textiles, on your own. Scroll down to see all the information behind these scales.

Fiber Types

Fiber Processing

Why two separate rating scales for one material (fabric)?

Having two scales captures a more complete picture of a fabric’s health for humans by considering two things: first, what the starting material was, and then, how it was processed. For example, polyester may be processed without additives, and the finished product may meet OEKO-TEX standards for human health. On the other hand, organic cotton may be used as a starting material, but finished with a formaldehyde coating to make it wrinkle-resistant (and therefore harmful to your health).

Fabric Information

Click on bolded statements for links to information and research.

What are 3rd party certifications? Why do third party certifications matter for fabric?

Third-party certification means that an independent group that didn’t make the product, has reviewed, tested, and verified the claims that the company making the product has made. For fabrics, a third party may test the product for all ingredients used throughout the entire process (like GOTS or MADE SAFE), or just for dangerous ones in the finished product (like OEKO TEX).

Third party certifications protect you from healthwashing. Just like greenwashing makes products appear better for the Earth than they really are, some companies intentionally make their products seem healthier for people than they really are, too.

Certifications

What does GOTS certified mean?

GOTS is short for the Global Organic Textile Standard.

It is the gold standard 3rd party certification for organic fabrics made from natural fibers like wool, cotton, linen, and others.

Fabric with the GOTS-certified organic label means that at least 95% of the starting fibers are certified organic, and ensures that the fabric remains healthy throughout the entire manufacturing process. This means the dyes and other chemicals used are safer for human and ecological health than standard fabric processing methods. No harmful finishes may be added to the final product.

What is MADE SAFE certified?

MADE SAFE certification has 6,500 chemicals on their banned/restricted list, which is based on a combination of European Union standards, the Red List, and other international agencies setting standards for products better for human health. While this certainly sounds impressive, I have become a bit more wary of it as I’ve learned more. It applies to fabrics and many other consumer goods, like cleaning products. So, while OEKO TEX “only” has 1,000 banned substances, it’s also primarily focused on textiles. It’s easier to get to 6,500 if you’re including the many chemicals potentially present in cleaning liquids and other things, too. So, this isn’t a direct comparison.

Secondly, the list isn’t a full ban. They state that “Some substances may have category specific allowances or technically unavoidable content, in which case either additional testing or threshold requirements may apply” here, but these limits aren’t published, nor is the list.

The transparency that GOTS, OEKO TEX, and other certifying bodies have, is important, so you know exactly what the limits are. While I’m sure that a MADE SAFE product is safer than one without testing, I now rate it as “OK” until the limits and list are more transparent.

What is OEKO TEX?

OEKO TEX certification applies to the finished product only, and is for both natural and synthetic textiles. Organic fibers, as well as man-made fabrics like polyester can both qualify, depending on what chemicals, and how much of them, are left in the final product. It does allow for some harmful chemicals, but in much lower quantities than are used in standard textile processing. You can see their limits, which are updated annually, here.

What is OEKO TEX Class I?

OEKO TEX has four product classes: I, II, III, and IV. Class I products have met the strictest requirements and limits, and are certified to be safe for babies and toddlers to touch. Babies and toddlers are more vulnerable to harmful exposures because their detoxification systems aren’t fully developed, they engage in hand-to-mouth behavior more often, and their cells are dividing rapidly as they grow, meaning they are more susceptible to mutagenic exposures.

Class II means direct skin contact is safe for adults, and applies to textiles like sheets and pillowcases. Class III and IV are still much safer for you than standard fabric processing— I really want to emphasize that! — and are reserved for items without direct skin contact, decorations, and home textiles you don’t touch very often (like curtains, for example).

What is OCS certified?

OCS stands for the Organic Content Standard. It is a third party certification by the Textile Exchange that is related to the Responsible Down Standard and the Global Recycled Standard. It has two levels: OCS100 means the fiber is at least 95% certified organic, and OCS Blended means 5% of the material is. Like USDA organic, it’s useful for certifying that the fibers themselves are grown organically in agriculture, but it doesn’t address the chemical processing afterward. Unlike USDA Organic certification, it is focused on textile products and other consumer goods, rather than food.

If you get something made with OCS certification, make sure it’s also OEKO TEX certified, ensuring that the chemicals used in processing are minimal, and safe for humans.

Is USDA Organic a useful certification for fabric?

No, not in the context of human health, on this website. USDA Organic applies to how the crop is grown, but not to what happens afterward. While fabric grown without pesticides is certainly a good thing, USDA organic cotton can easily have chemicals added to it during the manufacturing process. This certification applies better to food than to textiles.

What is BCI cotton?

Short for Better Cotton Initiative, BCI cotton is slightly better than conventionally processed cotton. The most toxic fertilizers and pesticides used to grow the fiber are banned, though not all of them. It is also theoretically better for workers and their wages, but it does not cover processing chemicals or what is left in the final product, like GOTS or OEKO TEX does. This is an interesting deep dive into it. I consider it standard processed cotton.

What is GRS certified?

GRS stands for Global Recycled Standard and is a third party certification set by the Textile Exchange. This is important because polyester that comes from recycled plastic water bottles can have a lot of added processing chemicals. The GRS helps ensure that chemicals with harmful potential aren’t allowed to be used.

What is the difference between GOTS vs OEKO TEX?

GOTS organic is a higher standard of health than OEKO TEX, because it requires that organic and safe ingredients are used throughout the entire process, from growing the fiber to dying it, to finishing and selling it. A good example comes from Two Sisters Ecotextiles: “Think of making applesauce. If you start with organic apples, but add red dye #2, stabilizers, preservatives, emulsifiers, etc., you do not get organic applesauce. The same is true with fabric.“

OEKO-TEX certification applies to the finished product only, and applies to both natural and synthetic textiles. Organic fibers, as well as man-made fabrics like polyester can both qualify, depending on what chemicals, and how much of them, are left in the final product. It does allow for some harmful chemicals, but in much lower quantities than are used in standard textile processing. You can see their limits, which are updated annually, here.

What is the difference between GOTS vs OCS?

GOTS is a higher standard of health than OCS because it requires . OCS is still a good thing, but has slightly different primary goals— namely, increasing organic agriculture.

What is the difference between MADE SAFE vs OEKO TEX?

OEKO TEX “only” has 1,000 banned substances, it’s also primarily focused on textiles. It’s easier to get to 6,500 if you’re including the many chemicals potentially present in cleaning liquids and other things, too. So, this isn’t a direct comparison.

Secondly, the list isn’t a full ban. They state that “Some substances may have category specific allowances or technically unavoidable content, in which case either additional testing or threshold requirements may apply” here, but these limits aren’t published, nor is the list.

The transparency that OEKO TEX and other certifying bodies have, is important, so you know exactly what the limits are. While I’m sure that a MADE SAFE product is safer than one without testing, I now rate it as “OK” until the limits and list are more transparent.

What are plant-based polymers?

Also known as bioplastics, plant-based plastic, or semi-synthetics, plant-based polymers are essentially plastic threads made from vegetables or trees. Small molecules from starchy foods, like corn, sugarcane, potatoes, eucalyptus trees, or other wood are extracted, then reacted in a factory with other chemicals to make polymers— the long chains of plastic that can be woven into fabrics, just like polyester or polypropylene.

Starting Materials

What is PLA?

PLA stands for polylactic acid, and is one of the most popular bioplastics available currently. It is derived from fermented plant starch like sugarcane or corn and turned into PLA, which is very similar to polyester, but made from plants instead of petroleum.

Is PLA safe?

It depends on how it’s processed and what is mixed in with it— A PLA with MADE SAFE or OEKO TEX certification helps ensure it is safer for human health and that harmful chemicals haven’t been added. Scroll down to see more about how fabrics are processed.

What is viscose?

Viscose is an example of a plant-based polymer fabric. It is made from cellulose that comes from wood pulp. The cellulose is extracted and is heavily processed with various chemicals, and can be energy and water -intensive. It’s certainly better for people and the earth than a petroleum-based fabric, but still isn’t as healthy as a truly natural fabric.

What is rayon?

Like viscose, rayon a plant-based polymer fabric, considered to be “semi synthetic”. Tencel is a brand of rayon. Instead of the cellulose starting material coming from wood pulp, Tencel or rayon is made from cellulose that comes from other plants— from eucalyptus, bamboo, soy, or cotton. The cellulose is extracted and a solvent is added to make it liquid, then it’s formed into fibers. It requires less pesticides and water than conventional cotton production and is certainly better for people and the earth than a petroleum-based fabric, but still isn’t as healthy as a truly natural fabric from a material perspective. However, it is very breathable and has good moisture-wicking properties, so can support healthy sleep.

Is viscose non toxic? Is rayon non toxic?

They are both certainly better for people and the earth than a petroleum-based fabric, but their overall health will depend on how they are processed and if harmful chemicals like are added in. Looking for MADE SAFE or OEKO TEX certification can help ensure they are safe fabrics.

Are plant-based polymers healthier than petroleum-derived ones?

They are imperfect, but yes. Bioplastics can be processed with the same chemicals as regular plastics, leaving behind impurities like antimony on the final product. Flame retardants and plasticizers can be added to the final product, too, just like regular plastic fabrics. And, bioplastic is still new enough that there are still very few studies on its safety. On the other hand, using potatoes means less petroleum refining, which is a major cancer risk to all who live nearby and work in refineries.

What are petroleum-derived polymers?

Synthetic, or man-made “fabrics”, come from petroleum, a fossil fuel. The petroleum is refined and then reacted with chemicals to make long chains of plastic that can be woven into fabrics, or made into non-woven plastic sheets. There are a few main types that show up in home furnishings: polyester (PET), polypropylene, and PVC.

Is polyester safe?

Polyester is the best-known synthetic textile, and is actually the same thing as PET (polyethylene terephthalate), what plastic bottles are made of. This is why you see clothing, sheets, and other fabrics advertised as being made from recycled plastic water bottles. Polyester itself is relatively stable once it’s made, meaning it doesn’t make its way into your body easily. In that sense, it’s safe.

Polyester’s health issues come from the chemicals that tag along with it. Antimony is used in the chemical reaction to make polyester, and it remains on the polyester in the final product. Antimony is a metallic element that is associated with lung irritation, and is possibly carcinogenic. BPA, phthalates, and other additives are very commonly mixed with polyester to make the fabric softer, more durable, flexible, and colorfast. Phthalates are absorbed directly through the skin and is linked to developmental and reproductive harm, cancer, metabolic disorders, diabetes and more, with worse health effects in infants and toddlers. Recycled polyester is made from plastic of unknown origin and date, so can contain unknown harmful chemicals. Finally, the process of making polyester poses cancer risks to the factory workers, and virgin polyester requires fossil fuel extraction and petroleum refining, posing long-term health risks to the earth and everyone on it.

All that said (!), polyester tested to have no impurities left on it can be essentially harmless to the user. This is especially true if it has GRS, OEKO TEX, or MADE SAFE certification, which ensures it’s not mixed with BPA or PFAS. It’s still a better choice for fillings than polyurethane foam, and a much better choice of fabric than PVC. It is good for waterproof applications, as it’s naturally water-resistant and dries quickly, reducing the need for PFAS. It also doesn’t off-gas, so can be a good low VOC fabric. Finally, it’s inexpensive. I use it for lower-contact uses in my home, like in my shower curtain and blackout blinds.

What is a “food grade polymer”?

In home furnishings, it’s often a grade 4 low-density polyethylene plastic, which is a lot like polyester, and has fewer of the issues that polystyrene and high-density polyethylene have. “Food grade” means there are no heavy metals, phthalates, or BPA in it, and it doesn’t leach into other foods at high temperatures or acidity levels. It’s specific for food contact, not home furnishings, so OEKO TEX or MADE SAFE certification is preferred for plastic fabrics like this. I recommend asking the manufacturer if flame retardants or PFAS are added. If not, then while it’s still petroleum-based plastic, it can be a relatively inert and safe substance for the user.

What is polypropylene?

Polypropylene comes from fossil fuel, in particular, the gas propylene. In polypropylene’s pure form, it’s a relatively hard plastic. It’s typically used to make packaging— the top of a Tic Tac box, for example— but can be made into fabric, too, like couch upholstery. To make it into a fabric, plasticizers, stabilizers, and fillers must be added so it becomes soft and flexible. It is completely unable to absorb water, and repels oil, so it’s used as a waterproof or oil-repellant fabric that doesn’t need added PFAS. It also resists bleach, so a colored polypropylene fabric can be cleaned with bleach without changing color.

Is polypropylene safe?

Because it’s naturally more rigid, plasticizers like phthalates, along with stabilizers and fillers, must be added to polypropylene to make it a flexible and fabric-like. While polypropylene itself is generally considered a relatively safe plastic for humans to touch, the additives are not safe. It’s also quite bad for our environment— it’s a fossil fuel, toxic during production, and won’t break down in the environment for hundreds of years.

What is Olefin?

Olefin is the same thing as polypropylene.

How is fabric processed? What harmful chemicals are added to fabric?

Read this comprehensive guide about textile production. It is where I sourced information to create this summary about the chemicals used in fabric processing below:

➜ Fiber creation: if grown conventionally, pesticides and fertilizers are used to grow the plant. Both organically grown and regular fibers can have acids, scouring chemicals, and other processing agents used to wash them. If synthetic, petroleum and catalysts are used.

➜ Fabric weaving: spinning oils, lubricants, and fiber-strengthening chemicals are aded to turn the fibers into sheets of fabric.

➜ Cleansing: detergents, solvents, bleaches, acids, and enzymes are used to remove chemicals from previous steps, make the fabrics lighter, or prepare them to accept dyes in the next step.

➜ Dyeing: pigments, binders, plasticizers, PVC, and other polymers (plastics) are used in this step, to make the dyes stick to the surface of the fabric.

➜ Finishing: chemical treatments are added to make the fabric perform a certain way. Formaldehyde resins offer wrinkle-resistance, other resins work for anti-pilling, PFAS for stain-resistance, polyglycols for anti-pilling, acrylates or PVC with plasticizers for protective coatings, and flame retardants for fire resistance.

Fabric Processing

Why does fabric have BPA in it?

Yes, some fabrics have BPA in them. This is because BPA not only makes polyester more flexible, but it’s also useful in making fabric colorfast— meaning it holds onto its dye and looks brighter and more colorful for longer. People have been surprised by the recent news that BPA is in socks, sports bras, and other synthetic clothing. The upholstery industry is no different. BPA does get into our bodies by drinking it, but it’s also absorbed through the skin, and causes reproductive harm.

Why are Flame Retardants in fabric bad?

Flame Retardants are well-known endocrine disrupting chemicals, and are linked with immune system dysfunction and neurodevelopmental issues like ADHD. They do not meaningfully reduce flammability, but are still routinely added to fabrics, especially drapes and curtains. Companies are not required to disclose whether their product contains Flame Retardants.

Why is formaldehyde added to fabric?

Formaldehyde coatings are added to make fabrics “wrinkle-free” or “wrinkle-resistant.” Formaldehyde is a known carcinogen, and can also cause rash or burning of the eyes. Companies are not required to disclose whether their product contains formaldehyde.

Why are PFAS added to fabric?

PFAS chemicals are added textiles to make them “water-resistant” or “stain-resistant.” PFAS are linked with lowered immune function, metabolic issues, reduced fertility, and a host of other health problems. They are also “forever chemicals,” meaning they do not break down in the environment. Companies are not required to disclose whether their product contains PFAS.

Are antimicrobial fabrics safe?

Antimicrobials are added to fabrics to make them seem healthier and resistant to germs. But, they do not meaningfully reduce exposure to pathogens any more than regular soap and water. Worse, they disrupt hormone function, are associated with developmental and reproductive effects, allergen sensitivity, and antibiotic resistance.

Is nanosilver fabric safe? Is graphene fabric safe?

These are both nanochemicals sometimes added to fabrics. The problem is, nanochemicals are so small, they can cross through our cell walls and even through our blood-brain barrier. The technology as a whole is very new, so caution is warranted. Nanosilver is known to be toxic to organs, and graphene is likely toxic to the lungs. Just like you avoid nano sunscreen, I recommend avoiding nano fabrics.

Fabric Guide