# NIOSH Pocket Guide to Chemical Hazards
Malonaldehyde | CAS 542-78-9
CHOCH2CHO | RTECS TX6475000
Synonyms & Trade Names Malonic aldehyde; Malonodialdehyde; Propanedial; 1,3-Propanedial [Note: Pure Malonaldehyde is unstable and may be used as its sodium salt.] | DOT ID & Guide
Exposure Limits | NIOSH REL: Ca See Appendix A See Appendix C (Aldehydes)
OSHA PEL: none
IDLH Ca [N.D.] | Conversion
Physical Description Solid (needles).
MW: 72.1 | BP: ? | MLT: 161°F | Sol: ?
VP: ? | IP: ? |  | Sp.Gr: ?
Fl.P: ? | UEL: ? | LEL: ? |
Incompatibilities & Reactivities Proteins [Note: Pure compound is stable under neutral conditions, but not under acidic conditions.]
Measurement Methods None available
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated/Daily Remove: When wet or contaminated Change: Daily Provide: Eyewash, Quick drench | First Aid (See procedures) Eye: Irrigate immediately Skin: Water flush immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration (APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode/(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus Escape: (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, respiratory system; central nervous system depression; [potential occupational carcinogen]
Target Organs Eyes, skin, respiratory system, central nervous system Cancer Site [in animals: thyroid gland tumors]
See also: INTRODUCTION