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Classification & Labelling & PBT assessment

PBT assessment

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PBT assessment: overall result

methacrylic anhydride
Type of composition:
legal entity composition of the substance
State / form:
Reference substance:
Composition 1
PBT status:
the substance is not PBT / vPvB

Persistence assessment

Methacrylic acid is demonstrated to be readily biodegradable in a 28 days OECD 301 D test and passed the 10 day window. Therefore, the substance is considered as not P (not persistent) and not vP (not very persistent).


Bioaccumulation assessment

Log Kow of methacrylic acid is 0.93 measured by shake flask method and the calculated log KOW of methacrylic anhydride is 1.28 (KOWWIN 1.68). Both values are fare below 4.5. Therefore the substance is demonstrated to be not B (bioaccumulative) and not vB (not very bioaccumulative).


Toxicity assessment

Based on aquatic toxicity test methacrylic acid is not classified as acute or chronic toxic to aquatic organisms. EC and LC50 values are fare above 0.1 mg/l (LC50/96h) fish: 85 mg/l; EC50/48h daphnia magna: > 130 mg/l; ECr50/72h) algae: 45 mg/l. Chronic values are fare above 1 mg/l. NOEC (35d) fish: 10 mg/l; NOECr algae (72 h): 8.2 mg/l.


8.1.2. Summary and overall conclusions on PBT or vPvB properties

In conclusion, methacrylic anhydride as well as methycrylic acid is not PBT nor vPvB substance.