PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Uranium telluride 12138-37-3
4.09
2.00
10.00
3.09
3.03
Formula Synonyms
Te2U
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
493.23 S
PAC Values
PAC Values (Original Units: mg/m3)
PAC-1 PAC-2 PAC-3
1.2 10 62
Converted PAC Values (ppm)
PAC-1 PAC-2 PAC-3
0.059 0.50 3.1
Technical Basis
A review of available sources did not identify exposure limits or acute toxicity data for uranium telluride. Instead, analysts evaluated exposure limits for insoluble uranium (U, CASRN: 7440-61-1) for TEEL development. The 1990 and 1994 IDLH use comparable sources, therefore the reason for the reduced limit was unclear. As such, the 1990 IDLH was selected as the TEEL-3 (Section 3.2) and a compound adjustment factor was applied (Section 3.2.2). The TEEL-2 was derived according to Table 3.5. The TLV-STEL was selected as the TEEL-1 basis and a compound adjustment factor was applied (Section 3.2.2).
• PAC-1 = TEEL-1 = MW-adjusted TLV-STEL (insoluble uranium compounds, CASRN: 7440-61-1; 0.6 mg/m3)
• PAC-2 = TEEL-2 = TEEL-3/6
• PAC-3 = TEEL-3 = MW-adjusted IDLH (1990, insoluble uranium, CASRN: 7440-61-1; 30 mg/m3)
This review generated PAC values consistent with Rev. 29A*.
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Uranium-telluride-_UTe2
Solubility information: https://comptox.epa.gov/dashboard/chemical/properties/DTXSID2065258
Uranium, metal and insoluble compounds IDLH: https://www.cdc.gov/niosh/idlh/7440611.html
Uranium, metal and insoluble compounds exposure limits: https://www.osha.gov/chemicaldata/544
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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.