NIOSH Pocket Guide to Chemical Hazards

Rosin core solder, pyrolysis products (as formaldehyde)


Synonyms & Trade Names
Rosin flux pyrolysis products, Rosin core soldering flux pyrolysis products
DOT ID & Guide


NIOSH REL*: TWA 0.1 mg/m3 [*Note: "Ca" in the presence of formaldehyde, acetaldehyde, or malonaldehyde. See Appendices A & C (Aldehydes).]
OSHA PEL†: none
IDLH N.D. See: IDLH INDEX Conversion
Physical Description
Pyrolysis products of rosin core solder include acetone, aliphatic aldehydes, methyl alcohol, methane, ethane, various abietic acids (the major components of rosin), CO & CO2.
Properties vary depending upon the specific rosin core solder being used.

Incompatibilities & Reactivities
Measurement Methods
NIOSH 2541, 3500
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
Skin: No recommendation
Eyes: No recommendation
Wash skin: No recommendation
Remove: No recommendation
Change: No recommendation

First Aid (See procedures)
Eye: Irrigate immediately

Breathing: Respiratory support

Important additional information about respirator selection
Respirator Recommendations Not available.
In the presence of Formaldeyde, Acetaldehyde, or Malonaldehyde:
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
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister having an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters./Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation
Symptoms Irritation to eyes, nose, throat, upper respiratory system [potential occupational carcinogen (in the presence of Formaldehyde, Acetaldehyde, or Malonaldehyde)]
Target Organs Eyes, respiratory system

Cancer Site [nasal cancer; thyroid gland tumors in animals (in presence of Formaldehyde, Acetaldehyde, or Malonaldehyde)]