Talk:Polydimethylsiloxane

Question for the caretaker(s) of this page: in the Chemistry section, the page says: "The chemical formula for PDMS is (H3C)3[Si(CH3)2O]nSi(CH3)3..." . Shouldn't this be "(H3C)3 Si O [Si(CH3)2O]nSi(CH3)3" ? my chemistry is alittle rusty but I think this needs to be there. (?true?). - lanephil, 2/25/08 —Preceding unsigned comment added by Lanephil (talk • contribs) 18:58, 25 February 2008 (UTC)

Are there also NON-organic polymers? I mean, because I think ALL polymers are organic, the word 'organic' in the first sentence is not necesary...

There are. As water is removed from phosphoric acid, for example, it becomes a long-chain polymer (see polyphosphate). One can also think of glass as a branching polymer with a backbone similar to silicone (a polysilicate). I'm sure there are other examples as well. But you're right that structural polymers are usually organic.--Joel 20:44, 12 April 2006 (UTC)

What's the Absorption Coefficient?

It's "optically clear"...... Anyone might know about this?

skin lotion

Dimethicone (1%) is listed as the "active ingredient" for "skin protection" in "CVS advanced hearling fragrance free lotion"; should skin something be mentioned as an application? Mike Linksvayer 21:02, 13 March 2007 (UTC)

Yes, its widely used as a skin protectant. I've added this in the article.

its also used in lubes.. pjur and probably others. trying to get some info on it when i found this page. more info on its safety would be welcome.

More than what? More than where it says it "is generally considered to be inert, non-toxic and non-flammable" and that "The Cosmetic Ingredient Review's (CIR) Expert Panel, has concluded that dimethicone and related polymers are 'safe as used in cosmetic formulations' [1]"? What are you looking for exactly? Some citation that it's actually not safe? I guess we could make one up for you. Here you go: [2]. 198.49.180.254 20:12, 14 September 2007 (UTC)

where can u find the history of this chemical at? like when it was discovered etc.? —Preceding unsigned comment added by 74.194.145.34 (talk) 03:39, 15 October 2007 (UTC)

Breast Implant Usage Safety Concern

What were/are the concerns with Polydimethylsiloxane's safety as a breast implant filler? The article is vague and I'd like to know more about them.24.83.148.131 (talk) 10:38, 25 May 2008 (UTC)BeeCier

Other Synonyms for Polydimethylsiloxane

I was looking on the web for info on the additive methyl silicone which was listed as an ingredient on my juice bottle. It turns out that it is just another synonym for Polydimethylsiloxane. Other synonyms are dimethicone, dimethyl silicone, methylpolysilicone and simethicone. Can someone edit the article to include these? Thank you.24.83.148.131 (talk) 10:43, 25 May 2008 (UTC)BeeCier

WikiProject Food and drink Tagging

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Mechanical Properties

It is a bit of a simplification to describe it as it is in this article. PDMS is availible in a wide range of viscosities that is basically down to the chain length. Some are 100Cst at room temperature whilst 50000CSt is no uncommon. I think whoever added this section has maybe assumed that PDMS is PDMS regardless.

Further, not all PDMS will crosslink. It is dependent on the terminal groups present on the chain. In the case where an Si(CH3)3 group is terminal this will not crosslink under condensation conditions (using a tin catalyst) or indeed using an addition catalyst (Platinum). Where it is methyl terminated you have silicone oil (but it is still PDMS).

The types that crosslink are classified (generally) as either Condesation or Addition. I'm not completely familiar with addition cure, but with condensation cure the terminal groups are generally hyodroxy silane (Si(CH3)2OH). Other groups will work, but this is probably most common. —Preceding unsigned comment added by 194.105.181.145 (talk) 13:12, 14 August 2009 (UTC)

Permanent bonding to glass?

After the plasma treatment, the bonding to a glass surface is not permanent. It is reversible and literature exist on this subject. —Preceding unsigned comment added by 128.178.153.51 (talk) 15:14, 9 October 2009 (UTC)

anorganic.

It does not contain any C (carbon) atoms, so it's anorganic.

One could say its pseudo-organic or something, since the Si approximates the C structures somewhat, but according to the general classification rules it's anorganic. see Organic chemistry

--80.66.10.152 (talk) 13:46, 2 August 2011 (UTC)

PDMS does contain carbon atoms – two of them per silicon, in fact. The empirical formula is C₂H₆OSi. So it's organic. Anorganic isn't a word in English – the word is inorganic. --Ben (talk) 13:58, 2 August 2011 (UTC)

Risks

Does anyone think a section on risks maybe needed? At least there seems to be evidence people are concerned about it. Hence either way, risk or no risk it would be important to clarify? Meepdeedoo (talk) 13:38, 5 December 2011 (UTC)

Amodimethicone

"Amodimethicone" redirects here, but that term is not defined, nor even mentioned, anywhere in the article. 86.179.113.84 (talk) 13:25, 17 May 2012 (UTC)