Search : Electronic And Electrical Testing, Safety Testing, Environmental Monitoring

Canadian official announcement: Five types of siloxane substances are harmless to health


Time:

2023-12-20

On December 9, 2023, in accordance with Section 68 of the Canadian Environmental Protection Act (CEPA) of 1999, the Department of Environment and the Department of Health conducted a comprehensive evaluation of the Chemical Management Plan for five substances in the siloxane group. The evaluation results showed that these five substances are harmless to human health and the environment.

On December 9, 2023, in accordance with Section 68 of the Canadian Environmental Protection Act (CEPA) of 1999, the Department of Environment and the Department of Health conducted a comprehensive evaluation of the Chemical Management Plan for five substances in the siloxane group. The evaluation results showed that these five substances are harmless to human health and the environment.

 

Material group

CAS No.

Common names (abbreviations)

ERC hazard classification ERC exposure classification ERC risk classification
Siloxane group

107-46-0

Hexamethyldisiloxane (L2)

low low low

141-62-8

Decamethyltetrasiloxane (L4) medium low low

141-63-9

Dodecyl pentasiloxane (L5) low low low

541-05-9

Cyclotrisiloxane (D3) low low low

2627-95-4

Diethylenetetramethyldisiloxane (dvTMDS) medium low low

 

Among them, L2, L5, and dvTMDS are not naturally produced, while L4 and D3 are naturally present in plants. According to the data submitted in the CEPA Article 71 survey, in 2008, Canada imported 10 to 100000 kilograms of L2, L4, L5, D3, and dvTMDS each.

 

Purpose

L2 is mainly used as a connector, functional liquid, and solvent in electronic products, cosmetics, medical devices, antifreeze and deicing products, and other products.

D3 is mainly used as a solvent and moisturizer in adhesives, sealants, cosmetics, etc.

L4 has no specific use as a standalone substance, but L5 can be used as a solvent and surfactant.

DvTMDS is used as an intermediate in the manufacturing of polymers and other organic compounds, as well as in food packaging materials.

 

 

Exposure risk assessment

The pathways through which the general population comes into contact with siloxanes mainly come from cosmetics and other consumer goods, or from the release of these substances into the environment during production, processing, use, or disposal. Due to the volatility of these substances and their application in cosmetics and other consumer products, oral and nasal inhalation and skin absorption are the main exposure pathways. At the same time, the assessment also takes into account the special risks of susceptible populations such as infants, young children, pregnant women, and the elderly. This evaluation selected the Ecological Risk Level (ERC), used multiple indicators for hazards and exposures, and comprehensively considered multiple pieces of evidence to determine different risk classifications. ERC is mainly based on indicators related to toxic modes of action, chemical reactivity, internal toxicity thresholds derived from food webs, bioavailability, and chemical and biological activity.

 

Evaluation conclusion

After considering all the data provided in this assessment, the Canadian Department of Environment has concluded that the risk of harm to the environment from the siloxane substance group is very low. The L2, L4, L5, D3, and dvTMDS in this substance do not meet the criteria of CEPA paragraph 64 (a) or (b), that is, the amount, concentration, or conditions of their entry into the environment will not have adverse effects on the environment or its biodiversity.

 

 

手机官网
手机官网

Wechat Public

Account