PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Dimethyltetramethoxydisiloxane, 1,3- 18186-97-5
4.00
3.00
Formula Synonyms
C6.H18.O5.Si2
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
226.3722 S
PAC Values
PAC Values (Original Units: mg/m3)
PAC-1 PAC-2 PAC-3
30 330 2000
Converted PAC Values (ppm)
PAC-1 PAC-2 PAC-3
3.2 36 220
Technical Basis
A review of available sources did not identify exposure limits, acute toxicity data, or health hazard ratings for this chemical. The PNOS TLV-TWA was selected as the TEEL-1 basis (Section 3.5.2). TEEL-3 and TEEL-2 values were derived according to Table 3.5.
• PAC-1 = TEEL-1 = TLV-TWA (PNOS, 10 mg/m3) x 3
• PAC-2 = TEEL-2 = TEEL-1 x 11
• PAC-3 = TEEL-3 = TEEL-2 x 6
This review generated PAC values consistent with Rev. 29A*.
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/1_1_3_3-Tetramethoxy-1_3-dimethyldisiloxane
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PAC values marked with a subscript "A" correspond to 60-minute AEGL values.
PAC values marked with a subscript "E" correspond to ERPG values.
PAC values marked by * are >= 10% lower explosive limit (LEL) but < 50% LEL.
PAC values marked by ** are > 50% LEL but < 100% LEL.
PAC values marked by *** are >= LEL.