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Maleic Acid, a solder flux activator


Synonyms: cis-2-butenedioic Acid; (2Z)-2-Butenedioic acid (IUPAC)
De: Maleinsäure Es(Pt): Ácido maleico Fr: Acide maléique Ru: Малеиновая кислота Ja:マレイン酸
CAS No.: 110-16-7
EINECS No.: 203-742-5

China Customs Code: 29171900.90

HS code: 291719
Molecular Weight: 116.072
Molecular Formula: C4H4O4
Structural Formula: maleic acid
Boiling Point: 275 °C

Flashing Point: 100°C
Solubility: Soluble in water, ethanol, acetone, glacial acetic acid


Maleic acid is mainly used to manufacture unsaturated resin, pesticides and other orangics. Maleic acid supplied by Wanjie International are specially used as a binary acid activator in solder flux to remove metal oxides in Surface Mount Technology (SMT) process.


Appearance white crystalline powder
Maleic Acid Purity 99.0% min.
m.p. 133°C to 135°C
Iron as Fe 5 ppm max.
Fumaric Acid 0.1% max.
Moisture 0.2% max.
Heavy Metals 10ppm max.
Sulphated ash 0.1% max.
Clarity conform


Standard Packaging

25kgs/fiber drum, on pallets.

Packaging photo coming soon

Risks and Safety Information

UN 3261, Class 8 PG III

Risk Phrase:R22, R36/37/38, R43

Safety Phrase:S26, S28, S28A, S37, S46, S24

Warning: Corrosive Solid

Corrosive Solid

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