PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Calcium cyanamide | 156-62-7 | 1403 |
15.01
11.01
4.08
4.09
2.00
10.00
5.00
4.11
|
|||||||||
| Formula | Synonyms | |||||||||||
| CCaN2 | CALCIUM CYANAMIDE, WITH MORE THAN 0.1% CALCIUM CARBIDE, AERO CYANAMID GRANULAR, AERO CYANAMID SPECIAL GRADE, AERO-CYANAMID, ALZODEF, CALCIUM CARBIMIDE, CALCIUM CYANAMID, CALCIUM CYANAMIDE, CALCIUM CYANAMIDE (CACN2), CCC, CIANAMIDA DE CALCIO, CON MÁS DEL 0.1% DE CARBURO DE CALCIO (, CY-L 500, CYANAMID, CYANAMIDE, CYANAMIDE CALCIQUE, CONTENANT PLUS DE 0,1% DE CARBURE DE CAL, CYANAMIDE GRANULAR, CYANAMIDE SPECIAL GRADE, CYANAMIDE, CALCIUM SALT (1:1), DORMEX, LIME NITROGEN, LIME-NITROGEN, LIMENITROGEN, NCI-C02937, NITROGEN LIME, NITROLIM, NITROLIME, PERLKA, USAF CY-2 | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 80.1 | S | 2.29 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 2.0 | 5.6 | 6.6 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.61 | 1.7 | 2.0 |
Technical Basis
A review of available sources identified the following: exposure limits (TWAs, MAK-STEL) and numerous acute toxicity data. Data sources were selected according to the hierarchy listed in Table 3.1. Toxicity data were selected according to type of exposure, species, and route according to the hierarchies stated in Sections 3.3.1, 3.3.2, and evaluated using factors in Tables 3.2, 3.3, and 3.4. Inhalation exposures were scaled to 60-minute equivalents using the ten Berge equation (Section 3.3.4).
The lowest reported rat LC50 was selected as the TEEL-3 basis. A rat oral TDLo with endpoints that would impede escape (tremors, difficulty breathing) was selected as the TEEL-2 basis. The MAK-TWA was selected as the TEEL-1 basis.
• TEEL-1 = MAK-STEL (2.0 mg/m3)
• TEEL-2 = Rat oral TDLo (250 mg/kg/10D, endpoints: tremors & difficulty breathing)
• TEEL-3 = Rat LC50 (150 mg/m3/4H)
This review generated TEEL-3 values lower than those in Rev. 29A. The Rev. 29A TEEL-3 basis was a rat oral LD50, while the current basis is a more preferred route/source (Table 3.1, Section 3.3.1). The Rev. 29A and current TEEL-2 values and source are consistent. The Rev. 29A TEEL-1 basis was a TLV-TWA, while the current TEEL-1 is a more preferred source, a STEL (MAK).
The lowest reported rat LC50 was selected as the TEEL-3 basis. A rat oral TDLo with endpoints that would impede escape (tremors, difficulty breathing) was selected as the TEEL-2 basis. The MAK-TWA was selected as the TEEL-1 basis.
• TEEL-1 = MAK-STEL (2.0 mg/m3)
• TEEL-2 = Rat oral TDLo (250 mg/kg/10D, endpoints: tremors & difficulty breathing)
• TEEL-3 = Rat LC50 (150 mg/m3/4H)
This review generated TEEL-3 values lower than those in Rev. 29A. The Rev. 29A TEEL-3 basis was a rat oral LD50, while the current basis is a more preferred route/source (Table 3.1, Section 3.3.1). The Rev. 29A and current TEEL-2 values and source are consistent. The Rev. 29A TEEL-1 basis was a TLV-TWA, while the current TEEL-1 is a more preferred source, a STEL (MAK).
References
Chemical info: https://pubchem.ncbi.nlm.nih.gov/compound/Cyanamide_-calcium
MAK-STEL; search by CASRN at: https://ilv.ifa.dguv.de/limitvalues/9534
TLV-TWA: https://www.osha.gov/chemicaldata/288
Rat oral TDLo and rat LC50. Retrieved from: http://niosh.dnacih.com/nioshdbs/rtecs/gs5b8d80.htm