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In the ingredient descriptions: Good means that I like to see this in a product's list of ingredients. Okay means this product appears safe for a curly person like me to use. Caution means that this ingredient may not be good in some hair care products, or for some people. Avoid means this ingredient may hurt your hair. If you see this ingredient in a hair product, it's best to put it down and walk away.

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Dimethicone    (aka Linear Polydimethylsiloxanes; Linear PDMS; Dimethyl silicone)
Good
This is the name for a group of silicones. The heaviest of all silicones used for hair care, they provide the most smoothing effect, but is hardest to wash out. Also might be considered too heavy for less curly hair [Beauty Brains pg 38 and provided link]. Conditions by preventing water loss. Also used to keep a product from foaming. Used in a huge amount of products, from hair conditioners to makeup [Gottschalck pg 562]. Gives a velvety feel. This does not evaporate [Schueller pgs 174-178]. Dimethicones are considered nonirritating to the skin and eyes. The different grades of Dimethicones come in different thicknesses, ranging from ones that will quickly evaporate (Hexamethyldisiloxane), to the consistency of honey, to those thicker than silly putty [Schueller pgs 174-178, Hunting (Conditioning) pgs181-182]. Though they are thick, they still allow the surface they are on to "breathe", meaning that water evaporation still occurs through it, so they aren't very moisturizing [Hunting (Conditioning) pg 181-182]. Makes product slippery so comb (or Denman) glides more easily through your curls. —T This is in one of my favorite, go to conditioners that I've been using for well over ten years. It has not caused any problems as far as conditioning and defining my hair. That's why I'm calling it a

* * * Tried and true ingredient * * *
See also: Silicone
Source(s): Gottschalck Beauty Brains Schueller Hunting http://www.theBeautyBrains.com http://clicks.aweber.com/y/ct/?l=DULo7&m=IsGc6lRxjJPguz&b=WQE7LVCT7u7x1K1bpcFv9A

Dimethicone bisamino hydroxypropyl copolyol   
Okay
Silicone that gives product a glassy or “silky” texture.
See also: Silicone
Source(s): http://answers.google.com

Dimethicone copolyol   
Caution
The general term for a group of substances that are dimethicone (silicone) derivatives. Some forms may be water soluble, but they may be more of a suspension in water. Used for a variety of purposes, such as film formers (such as used in gels), conditioning, stabilizers, and adding slipperiness. They are considered nonirritating to skin and eyes. They are known to be "plasticizing" when it's used in hair sprays. [Hunting (Conditioning) pg 182]. —Some versions of this may be sticky, or they may be slippery. Stlippery? So this would be great to see in your gel or mousse or hairspray, because you want those to have some hold. But it may build up if its present in shampoos or conditioners.—T
See also: Silicone Dimethicone
Source(s): Hunting http://www.cosmeticsinfo.org/ingredient_details.php?ingredient_id=1437 http://answers.google.com

Dimethicone Crosspolymer   
Caution
Used to keep a product from separating, and to thicken it. This also functions as a hair fixative. Gottschalck pg 564. I'm putting this as a Caution because it's listed as a hair fixative. This makes me think it will build up and make your hair sticky if it's in your shampoo or conditioner. It's fine in a gel, mousse or hairspray, because these are supposed to make your hair stick together.—T
See also: Silicone Emulsion stabilizer
Source(s): Gottschalck

Dimethicone Hydroxypropyl Trimonium Chloride   
Okay
Antistatic ingredient. Also used for conditioning. Gottschalck pg 564.
Source(s): Gottschalck

Dimethicone PEG-7 Avocadoate   
Okay
Used for hair conditioning and as an emollient. Made from PEG-7 dimethicone and the fatty acids from avocado oil. Gottschalck pg 565.
See also: Siloxane
Source(s): Gottschalck

Dimethicone PEG-7 Cocoate   
Okay
Light silicone that disperses in water. Provides slip to a product.
Source(s): http://www.personalcare.noveon.com/products/silicones.asp

Dimethicone PEG-7 Isostearate   
Okay
Used for hair conditioning. Emollient. Gottschalck pg 566.
See also: Emollient Siloxane
Source(s): Gottschalck

Dimethicone PEG-7 Olivate   
Okay
Hair conditioner. Emollient. Made from PEG-7 Dimethicone and fatty acids from olive oil. Gottschalck pg 566.
See also: Siloxane Emollient
Source(s): Gottschalck

Dimethicone PEG-7 Phosphate   
Okay
Cleanser that works by helping water mix with dirt and oil so they can be rinsed away.
See also: Dimethicone copolyol Silicone Surfactant
Source(s): http://www.cosmeticsinfo.org/ingredient_details.php?ingredient_id=1437

Dimethicone PEG-8 Adipate   
Okay
Hair conditioning ingredient and lubricant, making hair feel softer and smoother. Gottschalck pg 565.
See also: Dimethicone copolyol Silicone
Source(s): Gottschalck http://www.cosmeticsinfo.org/ingredient_details.php?ingredient_id=1437

Dimethicone PEG-8 Benzoate   
Okay
Conditioning ingredient. Slows the loss of water by forming a barrier on the surface of the hair.
See also: Dimethicone copolyol Silicone
Source(s): http://www.cosmeticsinfo.org/ingredient_details.php?ingredient_id=1437

Dimethicone PEG-8 Borageate   
Okay
Used for hair conditioning. Emollient. Made from PEG-8 Dimethicone and the fatty acids from borage seed oil. Gottaschalck pg 565.
See also: Emollient
Source(s): Gottschalck

Dimethicone PEG-8 Meadowfoamate   
Okay
Emollient.

Dimethicone PEG-8 Polyacrylate   
Caution
Used to hold hair in place. Also used to keep the ingredients in the product mixed together. Gottschalck pg 567. I'm putting this as a caution because this is a sticky ingredient that can build up in your hair. It's fine if it's in a gel, mousse or hairspray—those are supposed to keep your hair stuck together. I'd avoid it in in a shampoo or conditioner. —T
Source(s): Gottschalck

Dimethicone PEG-10 Phosphate   
Okay
Cleanser that works by helping water mix with dirt and oil so they can be rinsed away.
See also: Dimethicone copolyol Silicone Surfactant
Source(s): http://www.cosmeticsinfo.org/ingredient_details.php?ingredient_id=1437

Dimethicone PEG/PPG-7/4 Phosphate   
Okay
Cleanser that works by helping water mix with dirt and oil so they can be rinsed away.
See also: Dimethicone copolyol Silicone Surfactant
Source(s): http://www.cosmeticsinfo.org/ingredient_details.php?ingredient_id=1437

Dimethicone PEG/PPG-12/4Phosphate   
Okay
Cleanser that works by helping water mix with dirt and oil so they can be rinsed away.
See also: Dimethicone copolyol Silicone Surfactant
Source(s): http://www.cosmeticsinfo.org/ingredient_details.php?ingredient_id=1437

Dimethicone PEG/PPG-20/23 Benzoate   
Okay
Conditioning ingredient. Slows the loss of water by forming a barrier on the surface of the hair.
See also: Dimethicone copolyol Silicone
Source(s): http://www.cosmeticsinfo.org/ingredient_details.php?ingredient_id=1437



References:

Applewhite, Thomas H., ed. Proceedings of the World Conference on Lauric Oils: Sources, Processing, and Applications
AOCS Publishing, 1994.

Barel, André O., Marc Paye, and Howard I. Maibach., eds. Handbook of Cosmetic Science and Technology, Second Edition
Marcel Dekker, Inc., 2001.

Begoun, Paula. Don’t Go Shopping for Hair-Care Products Without Me. 3rd Edition.
Renton: Beginning Press, 2005.

Begoun, Paula. The Beauty Bible.
Renton: Beginning Press, 2002.

Begoun, Paula. Don’t Go to the Cosmetics Counter Without Me.
Renton: Beginning Press, 2003.

Bellum, Sarah, ed. The Beauty Brains: Real Scientists Answer Your Beauty Questions
New York: Brains Publishing, 2008.

Gottschalk, Tari E. and McEwen, Gerald N, Jr. PhD, eds. International Cosmetic Ingredient Dictionary and Handbook, Tenth Edition 2004, Volumes 1-4.
Washington D. C.: The Cosmetic, Toiletry, and Fragance Association, 2004.

Halal, John Hair Structure and Chemistry Simplified, Fifth Edition
Albany: Milady, 2002.

Hunting, Anthony L.L. Encyclopedia of Conditioning Rinse Ingredients.
Cranford, NJ: Micelle Press, Inc., 1987.

Hunting, Anthony L.L. Encyclopedia of Shampoo Ingredients.
Cranford, NJ: Micelle Press, Inc., 1983.

Johnson, Dale H. (Ed.). Hair and Hair Care, Cosmetic Science and Technology Series. Vol. 17.
New York: Marcel Dekker, 1997. Print.

Nnanna, Ifendu A. and Jiding Xia., eds. Protein-Based Surfactants: Synthesis: Physicochemical Properties, and Applications (Surfactant Science)
Madison Heights: CRC, 2001.

Quadflieg, Jutta Maria. Fundamental properties of Afro-American hair as related to their straightening/relaxing behaviour.
Diss. U of Rheinisch-Westfälischen Technischen Hochschule Aachen, 2003.

Schueller, Randy and Perry Romanowski, eds. Conditioning Agents for Hair and Skin.
New York: Marcel Dekker, Inc., 1999.

Winter, Ruth M.S. A Consumer's Dictionary of Cosmetic Ingredients: Complete Information About the Harmful and Desirable Ingredients Found in Cosmetics and Cosmeceuticals
New York: Three Rivers Press, 2005.

Zviak, Charles., ed. The Science of Hair Care (Dermatology)
New York: Marcel Dekker, Inc., 1986.

 

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