Forchlorfenuron (CPPU), 99% TC, 1% SP
Synonyms: 1-(2-chloro-4-pyridyl)-3-phenylurea (IUPAC); N-(2-chloro-4-pyridinyl)-N'-phenylurea; CPPU; 'Sitofex' (Alzchem). Other products 'Caplit' (Kyowa); 'Fulmet' (Kyowa); 'Prestige' (Valent).
CAS No.: 68157-60-8
Molecular Weight: 247.68
Molecular Formula: C12H10ClN3O
Form: White to off-white crystalline powder.
M.p.: 165–170 °C
V.p.: 4.6 × 10-5 mPa (25 °C, gas saturation)
Kow: logP = 3.2 (20 °C)
Henry: 2.9 × 10-7 Pa m3 mol-1
S.g./density: 1.3839 (25 °C)
Solubility: In water 39 mg/l (pH 6.4, 21 °C). In methanol 119, ethanol 149, acetone 127, chloroform 2.7 (all in g/l).
Stability Stable to heat and light. Not hydrolysed over 30 d at pH 5, 7 and 9 (25 °C).
pKa: pKa1 2.5, pKa2 12.25 (EU Rev. Rep.)
Absorbed by leaves, stem, cotyledon and germinated seeds, forchlorfenuron (CPPU) promotes cell division, differentiation and development; induces budding of callus, and controls apical dominance; breaks dormancy of lateral buds and promotes germination; delays ageing process and maintains chlorophyll in excised leaves; regulates the transport of nutrients; promotes fruit formation, etc. Used to increase the size of kiwifruit, table grapes and peaches; promote fruit set in melons, pumpkins and cucumbers; promote branching in apples; and increase yield in potatoes, rice and wheat. Applied at 1–1000 ppm, depending on crop. Phytotoxicity Herbicidal activity at higher concentrations.
|Residues after ignition||0.1% max.|
|Loss on drying||0.5% max.|
1% SP is also available.
Carton, Aluminum foil bag
Risks and Safety Information
Forchlorfenuron (CPPU) is not regulated by UN as hazardous substance.
Acute oral LD50 for male rats 2787, female rats 1568. Skin and eye Acute percutaneous LD50 for rabbits >2000 mg/kg. Mild eye irritant; not a skin irritant. Birds Acute oral LD50 for bobwhite quail >2250 ng/kg. Dietary LC50 (5 d) for bobwhite quail >5600 ppm. Fish LC50 (96 h) for rainbow trout 9.2 mg/l. Algae EbC50 (72 h) for Pseudokirchneriella subcapitata 3.3 mg/l (EU Rev. Rep.). Bees LD50 (contact) for honeybees >25 μg/bee (EU Rev. Rep.)