Metsulfuron-methyl TC, WDG, WP

Metsulfuron-methyl  TC, WDG, WP 

METSULFURON-METHYL TECHNICAL MATERIAL FAO Specification 441 / TC (March 2020*)

This specification, which is PART ONE of this publication, is based on an evaluation of data submitted by the manufacturers whose names are listed in the evaluation reports (441/2001, 441/2010, 441/2017, 441/2019.1 and 441.2019.2). It should be applicable to relevant products of these manufacturers but it is not an endorsement of those products, nor a guarantee that they comply with the specifications. The specification may not be appropriate for the products of other manufacturers. The evaluation reports (441/2001, 441/2010, 441/2017, 441/2019.1 and 441.2019.2) as PART TWO form an integral part of this publication.

1 Description

The material shall consist of metsulfuron-methyl together with related manufacturing impurities and shall be an off-white to beige, homogenous, crystalline solid, free from visible extraneous matter and added modifying agents.

2 Active ingredient

2.1 Identity tests (441/TC/M/2, CIPAC Handbook H, p. 205, 1998)

The active ingredient shall comply with an identity test and, where the identity remains in doubt, shall comply with at least one additional test.

2.2 Metsulfuron-methyl methyl content (441/TC/M/3, CIPAC Handbook H, p.205, 1998)

The metsulfuron-methyl content shall be declared (not less than 960 g/kg) and, when determined, the average measured content shall not be lower than the declared minimum content.

FAO Specification 441 / WG (March 2020*)

This specification, which is PART ONE of this publication, is based on an evaluation of data submitted by the manufacturers whose names are listed in the evaluation reports (441/2001, 441/2010, 441/2017 441/2019.1 and 441.2019.2). It should be applicable to relevant products of these manufacturers but it is not an endorsement of those products, nor a guarantee that they comply with the specifications. The specification may not be appropriate for the products of other manufacturers. The evaluation reports (441/2001, 441/2010 , 441/2017 441/2019.1 and 441.2019.2) as PART TWO form an integral part of this publication.

1. Description

The material shall consist of a homogeneous mixture of technical metsulfuron-methyl, complying with the requirement of FAO Specification 441/TC (March 2020), together with fillers and any other necessary formulants. It shall be in the form of granules for application after disintegration and dispersion in water. The formulation shall be dry, free-flowing, essentially non-dusty, and free from visible extraneous matter and hard lumps.

2. Active ingredient

2.1 Identity tests (441/WG/M/2, CIPAC Handbook H, p 207, 1998)

The active ingredient shall comply with an identity test and, where the identity remains in doubt, shall comply with at least one additional test.

2.2 Metsulfuron-methyl content (441/WG/M/3, CIPAC Handbook H, p. 207, 1998)

The metsulfuron-methyl content shall be declared (g/kg) and, when determined, the average content measured shall not differ from that declared by more than the following amounts:

Declared content Permitted tolerance

above 100 up to 250 g/kg ± 6% of declared content

above 250 up to 500 g/kg ± 5% of declared content

above 500 g/kg ± 25 g/kg

3. Physical properties

3.1 Wettability (MT 53.3.1, CIPAC Handbook F, p.165, 1995) (Note 1)

The formulation shall be completely wetted in 60 seconds.

3.2 Wet sieve test (MT 185, CIPAC Handbook K, p.149, 2003)

Maximum: 2.0% retained on a 75 μm test sieve.

3.3 Degree of dispersion (MT 174, CIPAC Handbook F, p. 435, 1995)

Minimum: 70% after 1 minute of stirring.

3.4 Suspensibility (MT 184.1) (Notes 2, 3 and 4)

A minimum of 75% of the metsulfuron-methyl found under 2.2 shall be in suspension after 30 min in CIPAC Standard Water D at 25 ± 5°C.

3.5 Persistent foam (MT 47.3, CIPAC Handbook O, p. 177, 2017) (Note 5)

Maximum: 25 ml after 1 minute.

3.6 Dustiness (MT 171.1) (Notes 6 & 7)

Essentially non-dusty.

3.7 Flowability (MT 172.2) (Notes 8 & 9)

At least 99% of the formulation shall pass through a 5 mm test sieve after 20 drops of the sieve.

3.8 Attrition resistance (MT 178.2, CIPAC Handbook K, p. 140, 2003)

Minimum: 98% attrition resistance.

4. Storage stability

4.1 Stability at elevated temperature (MT 46.4) (Note 10)

After storage at 54 ± 2°C for 14 days, the determined average active ingredient content must not be lower that 95% relative to the determined average content found before storage (Note 11) and the formulation shall continue to comply with the clauses for: 

- wet sieve test (3.2),

- degree of dispersion (3.3),

- suspensibility (3.4) and

- dustiness (3.6).

METSULFURON-METHYL WETTABLE POWDERS

FAO Specification 441 / WP (March 2020*)

This specification, which is PART ONE of this publication, is based on an evaluation of data submitted by the manufacturer whose name is listed in the evaluation reports (441/2001, 441/2019.1 and 441.2019.2). It should be applicable to relevant products of this manufacturer but it is not an endorsement of those products, nor a guarantee that they comply with the specifications. The specification may not be appropriate for the products of other manufacturers. The evaluation reports (441/2001, 441/2019.1 and 441.2019.2) as PART TWO form an integral part of this publication.

1 Description

The material shall consist of a homogeneous mixture of technical metsulfuron-methyl complying with the requirement of FAO Specification 441/TC (March 2020), together with fillers and any other necessary formulants. It shall be in the form of a fine powder free from visible extraneous matter and hard lumps.

2 Active ingredient

2.1 Identity tests: (441/WP/M/2, CIPAC Handbook K, 2003, p.95)

The active ingredient shall comply with an identity test and, where the identity remains in doubt, shall comply with at least one additional test.

2.2 Metsulfuron-methyl content (441/WP/M/3, CIPAC Handbook K, 2003, p.95)

The metsulfuron-methyl content shall be declared in g/kg and, when determined, the average content measured shall not differ from that declared by more than the following amounts:

Declared content in g/kg Permitted Tolerance

above 25 up to 100 ± 10% of the declared content

above 100 up to 250 ± 6% of the declared content

above 250 up to 500 ± 5% of the declared content

above 500 ± 25% g/kg

3 Physical properties

3.1 Wet sieve test (MT 185, CIPAC Handbook K, p.149, 2003)

Maximum: 2 % retained on a 75 μm test sieve.

3.2 Suspensibility (MT 184.1) (Notes 1, 2, 3 and 4)

A minimum of 65 % of the metsulfuron-methyl found under 2.2 shall be in suspension after 30 min in CIPAC Standard Water D at 25 ± 5°C.

3.3 Persistent foam (MT 47.3, CIPAC Handbook O, p. 177, 2017) (Note 5) Maximum: 25 ml after 1 minute

3.4 Wettability (MT 53.3.1, CIPAC Handbook F, p.165, 1995) (Note 6)

The formulation shall be completely wetted in 60 seconds without swirling

4 Storage stability

4.1 Stability at elevated temperature (MT 46.4) (Note 7)

After storage at 54 ± 2°C for 14 days, the determined average active ingredient content must not be lower than 95 % relative to the determined average content found before storage (Note 8) and the formulation shall continue to comply with the clauses for: - wet sieve test (3.1),

- suspensibility (3.2) and

- wettability (3.4)