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Introduction: Penoxsulam is an acetolactate synthase inhibitor herbicide. It provides broad-spectrum control of many annual, biannual, and perennial weeds. It is used mainly as a post-emergency foliar spray or a granular formulation for the control of broadleaf, sedge, and grass weeds in transplanted, dryseeded, and water-seeded rice. It is also effective against broadleaf weeds in corn, sorghum, wheat, barley and other cereal crops, lawns, golf courses, parks, cemeteries, athletic fields, sod farms, tree and vine crops, range and pasture, roadsides, and other crop and non-crop uses.

Common name: Penoxsulam

Another name: Granite, Penoxsulam [ISO], UNII-784ELC1SCZ, 784ELC1SCZ, CHEBI:81776, DSSTox_CID_14803

Chemical name: C16H14F5N5O5S

Empirical formula: 2-(2,2-difluoroethoxy)-N-(5,8-dimethoxy-[1,2,4]triazolo[1,5-c]pyrimidin-2-yl)-6-(trifluoromethyl)benzenesulfonamide

Structural formula:

Mol. Weight: 483.37 g/mol

CAS No.: 219714-96-2


Leading Penoxsulam supplier

Penoxsulam 25 g/L OD

Penoxsulam 240 g/L SC Penoxsulam 98% TC


BULK PACKING                                                     

Powder: 25KG/Bag, 25KG/Drum, 50KG/Drum etc.                    

Liquid: 200L/Drum, 20L/Drum, 10L/Drum ect.


Powder: 1kg/Alu bag, 500g/Alu bag, 200g/Alu bag, 100g/Alu bag, 50g/Alu bag, 15g/Alu bag etc. 

Liquid: 5L/Drum, 1L/Bottle, 500ml/Bottle, 250ml/Bottle, 100ml/Bottle, 50ml/Bottle etc.

Customerized Packing label

Penoxsulam FAO standard

Professional registration


Hazard statement(s)

H400: Very toxic to aquatic life.

H410: Very toxic to aquatic life with long lasting effects.

Precautionary statement(s)

P273: Avoid release to the environment.

P391: Collect spillage.

P501: Dispose of contents/container to ...

Supplemental Hazard Statements: none


Acute toxicity: 1) Acute oral LD50 for rat: >5000 a.i.mg/kg. 2) Acute dermal LD50 for rabbit: >5000 a.i.mg/kg. 3) Inhalation LC50 (4 h) for rat: 3.5 a.i. mg/L. 4) Non- irritating to skin (rabbits). 5) Non- irritating eyes (rabbits). 6) Not a skin sensitiser (guinea pigs). There was no evidence of carcinogenicity, genotoxic, or neurotoxic.

ADI (JMPR): 0.05 mg/kg b.w.


Toxicity class WHO (a.i.) U (Unlikely to present an acute hazard)

EC Risk Classification: N - Dangerous for the environment: R50/53


Effect on birds: low toxicity to birds, acute oral LD50 for Colinus virginianus is >2025 a.i.mg/kg. Effect on fish: low toxicity to fish, acute 96 hour LC50 for Oncorhynchus mykiss is >100 a.i.mg/L. Effect on aquatic invertebrates: moderate toxicity to aquatic invertebrates, acute 48 hour EC50 for Daphnia magna is 98.3 a.i.mg/L. Effect on algae: moderate toxicity to algae, acute 72 hour EC50 for Anabaena flos-aquae is 0.49 a.i.mg/L. Effect on honeybees: low toxicity to honeybees, contact acute 48 hour LD50 is >100 a.i.μg/bee; Oral acute 48 hour LD50 is >100 a.i.μg/bee. Effect on earthworms: low toxicity to earthworms, acute 14 day LC50 for Eisenia foetida is >1000 a.i.mg/kg.


Penoxsulam's production may result in its release to the environment through various waste streams; its use as a herbicide will result in its direct release to the environment. If released to air, vapor pressure of 7.2×10-16 mm Hg at 25 deg C indicates penoxsulam will exist solely in the particulate phase in the atmosphere. Particulate-phase penoxsulam will be removed from the atmosphere by wet or dry deposition. If released to soil, penoxsulam is expected to have very high mobility based upon an estimated Koc value of 30. The pKa of penoxsulam is 5.1, indicating that this compound will exist partially in cation form in the environment and cations generally adsorb more strongly to soils containing organic carbon and clay than their neutral counterparts. Volatilization from moist soil surfaces is not expected to be an important fate process based upon an estimated Henry's Law constant of 1.1×10-18 atm-cu m/mole. In soil penoxsulam is expected to biodegrade rapidly based on reported aerobic half-lives of 22 to 58 days and an anaerobic half-life of 6.6 days. Penoxsulam is rapidly photodegraded from soil with half-lives of 5.2 to 12.8 days. If released into water, penoxsulam is not expected to adsorb to suspended solids and sediment based upon the Koc values. Aqueous biodegradation of penoxsulam is expected based on reported anaerobic half-lives of 2 to 13 days in simulated flooded rice field conditions. Volatilization from water surfaces is not expected to be an important fate process based upon this compound's estimated Henry's Law constant. An estimated BCF of 3 suggests the potential for bioconcentration in aquatic organisms is low. Hydrolysis is not expected to be an important environmental fate process since penoxsulam lacks functional groups that hydrolyze under environmental conditions. Penoxsulam is rapidly photodegraded from water with half-lives of 2.9 to 26.5 days. Occupational exposure to penoxsulam may occur through inhalation of dust and dermal contact with this compound at workplaces where penoxsulam is produced or used.

Usage: Penoxsulam is a new post-emergence herbicide developed by Dow AgroSciences to be used on rice crops for the control of broad-leaved weeds, aquatic weeds and certain grasses.

Application: Broadest spectrum herbicide for rice. Systemic herbicide to inhibit the acetolactate synthase, absorbed by stem, leaf, budlet, root. It will inhibit the plant’s growth, chlorosis appears on the growing point, the terminal bud will turn red in 7~14 days and necrotic, the plant will die in 2~4 weeks. Long duration of 30~60 days, one off application can control the whole season’s weed. It can also control the weeds which be resisted to Bensulfuron methyl. It cannot kill Leptochloa chinensis, so it can be used with Cyhalofop-butyl to control it.

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