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Main Uses and Environmental Emissions of Volatile Methylsiloxanes

  • Yuichi HoriiEmail author
  • Kurunthachalam Kannan
Chapter
Part of the The Handbook of Environmental Chemistry book series

Abstract

The main uses and environmental emissions of cyclic methylsiloxanes (CMSs) and linear methylsiloxanes (LMSs), especially the three volatile CMSs (D4, D5, and D6), were reviewed. This chapter provides information on production, use, concentrations in various products, as well as emission of volatile methylsiloxanes (VMSs) into the environment. Many silicone-based products contain residues of CMSs as impurities, and hence the occurrence of VMSs in silicone-based materials (such as rubber products) has been described. CMSs are mainly used as intermediates in the production of silicone polymers, silicone fluids, elastomers, and resins, all of which have diverse industrial and consumer applications. CMSs are also used directly in personal care products (PCPs), as carriers. The concentrations and profiles of CMSs and LMSs in PCPs and household products from North America, Europe, and Asia varied widely across and within the product categories. The measured concentrations ranged from 0.01% in body wash to 70% (by weight) in deodorants. D5 was the predominant CMS found with high detection frequency in most PCPs. The correlations among VMSs in consumer products suggested incorporation of different blends of silicones to the raw material or as additives in those products. The industrial production of VMSs and direct use of PCPs result in significant emissions of VMSs into the environment. High production volume, high mobility, and environmental persistence of VMSs are causes of concern. VMSs, especially CMSs, were found globally in various environmental matrices including air, water, and sludge. This chapter also provides information on the concentrations and patterns of VMSs in the environment surrounding silicone factories, paper production facilities, and oil fields.

Keywords

Environmental emissions Personal care products Silicone industry Siloxanes Wastewater treatment plants 

Abbreviations

CMS

Cyclic methylsiloxane

D3

Hexamethylcyclotrisiloxane

D4

Octamethylcyclotetrasiloxane

D5

Decamethylcyclopentasiloxane

D6

Dodecamethylcyclohexasiloxane

GC/MS

Gas chromatography/mass spectrometry

L3

Octamethyltrisiloxane

L4

Decamethyltetrasiloxane

L5

Dodecamethylpentasiloxane

L6

Tetradecamethylhexasiloxane

LMS

Linear methylsiloxane

LOQ

Limit of quantification

MDL

Method detection limit

NA

Not available

ND

Not detected

PCPs

Personal care products

PDMS

Polydimethylsiloxane

SOA

Secondary organic aerosols

SVHC

Substances of very high concern

VMS

Volatile methylsiloxane

VOC

Volatile organic compound

WWTP

Wastewater treatment plant

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Center for Environmental Science in SaitamaKazoJapan
  2. 2.Wadsworth Center, New York State Department of HealthAlbanyUSA

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