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Plant Growth Regulators P-Chlorophenoxyacetic acid 4-CPA

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Product Details

Plant growth regulator 4-Chlorophenoxyacetic acid 4-CPA

4-Chlorophenoxyacetic acid 4-CPA is used as plant growth regulator, 4-CPA is absorbed by plant via root, stem, leaf, bloom and fruit. Widely used on tomato to prevent abscission of bloom and fruit.

CAS NO.: 122-88-3

Chemical name: 2-(4-Chloro-phenoxy) acetic acid; 

4-Chlorophenoxyacetic acid


Physical and Chemical Properties

Appearance: White powder

Molecular Formula: C8H7ClO3

Molecular Weight: 186.59

Melting Point: 157-159°C

Solubility: Sparingly soluble in water. Readily soluble in most organic solvents.

4-CPA sodium salt is soluble in water. 

Stability: It is stable at elevated temperatures (54 ℃) and on exposure to metals, but degrades (30% loss in 24 hours) on exposure to sunlight.



Acute oral LD50 for rats 2200mg/kg;

Acute dermal LD50 for rats>2200mg/kg;

Irritation to skin and eyes.

LC50 for fish: carp 3-6ppm, locah (48hr) 2.5ppm, water flea>40ppm.



1. It is used to prevent abscission of bloom and fruit, inhibit rooting of beans, promote fruit set, induce formation of seedless fruit.

2.It is also used for ripening and fruit thinning.

3.It performs better when used in combination with 0.1% monopotassium phosphate.

It also has herbicidal effect at high dosage.

4.It can increase the percentage of the fruit bearing(increase output) and promote the enlargement of fruit


Target Crop:

Tomato: When blossom for 2-3 flowers, soak flowers in 10-20ppm.

Do this three times, every 7-10 days

Pumpkin Watermelon / Cucumber, etc.(melon group):   

Soak or spray the flower in 20-25ppm

Pepper: 10-15ppm

Purple orange litchi Apple Longan: In florescence 25-30 ppm


Specification: 98%TC




White crystal

Melting Point

155-159 °C

Residues after Ignition


Loss on Drying


Content (HPLC)



Package: 1kg/bag, 25kg/drum

Note: 4-Chlorophenoxyacetic acid 4-CPA is not soluble in water, but 4-CPA sodium salt is soluble in water. Please click here for more details