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81330

Sigma-Aldrich

Poly(methylhydrosiloxane)

viscosity 15-40 mPa.s (20 °C)

Synonym(s):

Methylhydrogensiloxane polymer, PMHS

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About This Item

Linear Formula:
(CH3)3SiO[(CH3)HSiO]nSi(CH3)3
CAS Number:
63148-57-2
MDL number:
MFCD00084478
UNSPSC Code:
12162002
PubChem Substance ID:
24887755
NACRES:
NA.23
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form

liquid

Quality Level

200

refractive index

n20/D 1.398

viscosity

15-40 mPa.s(20 °C)

density

1.006 g/mL at 25 °C (lit.)

SMILES string

[Si](C)(C)(C)C.[Si](O)(C)(C)C.[SiH](O)(C)C

InChI key

KZFYHEHDBPYRMU-UHFFFAOYSA-N

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Other Notes

Reducing agent[1][2]

Storage Class Code

10 - Combustible liquids

WGK

WGK 3

Flash Point(F)

399.2 °F - closed cup

Flash Point(C)

204 °C - closed cup

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Certificates of Analysis (COA)

Lot/Batch Number
BCCM2919
BCCK2770
BCCH0460
BCCG8236
BCCG4644

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C. Chuit et al.
Synthesis, 981-981 (1982)
I. Pri-Bar et al.
The Journal of Organic Chemistry, 51, 734-734 (1986)

Questions

  1. Is additional curing (cross-linking) chemical needed for product 81330, Poly(methylhydrosiloxane)?

    1 answer

    1. product 81330 does not cross-link on its own at temperatures below 200°C. It requires a curing agent, with the most common options being basic materials such as amines, metal oxides, and metal hydroxides. However, caution is advised during the cross-linking process, as too rapid a cross-link can lead to rapid hydrogen gas evolution, which is highly flammable. This risk can be mitigated by using a lower dosing of the base or a weaker basic material.

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