Methomyl TC, SP, SL

Methomyl TC, SP, SL

METHOMYL TECHNICAL MATERIAL

FAO Specification 264/TC (2002)

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 report

(264/2002). 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 report (264/2002) as PART TWO forms an integral

part of this publication.

1 Description

The material shall consist of methomyl together with related manufacturing

impurities and shall be a white to off-white, homogenous, crystalline solid, free

from visible extraneous matter and added modifying agents.

2 Active ingredient

2.1 Identity tests (264/TC/(M)2, CIPAC handbook H, 1998, p200)

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 Methomyl content (264/TC/(M)2, CIPAC handbook H, 1998, p200)

The methomyl content shall be declared (not less than 980 g/kg) and, when

determined, the average measured content shall not be lower than the

declared minimum content.

METHOMYL WATER SOLUBLE POWDERS

FAO Specification 264/SP and 264/SP-SB (2002)

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 report

(264/2002). 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 report (264/2002) as PART TWO forms an integral

part of this publication.

1 Description

The material shall consist of a homogenous mixture of technical methomyl,

complying with the requirements of FAO specification 264/TC (2002), together

with filler(s) and any other necessary formulants (Note 1). It shall be in the

form of a powder to be applied as a true solution of the active ingredient after

solution in water, but which may contain insoluble inert ingredients.

Where the material is packaged in sealed water soluble bags, it shall be

additionally described as a defined quantity of methomyl water soluble

powder, contained in a sealed water soluble bag.

2 Active ingredient

2.1 Identity tests (264/TC/(M)3, CIPAC handbook H, 1998, p.200)

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 Methomyl content (264/WP/(M)3, CIPAC handbook H, 1998, p.202)

The methomyl content shall be declared (g/kg) and, when determined, the

content obtained shall not differ from that declared by more than the following

amounts:

Declared content of active         Permitted tolerance

ingredient in g/kg

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

Note In each range theupper limit is included

3 Physical properties

3.1 pH range (MT 75.3)

pH range: 4.0 to 8.0

3.2 Wettability (MT 53.3)

The formulation shall be completely wetted in 1 min., without swirling.

3.3 Degree of dissolution and solution stability (MT 179)(Note 2)

Residue of formulation retained on a 75μm test sieve after dissolution in

CIPAC Standard Water D at 30 ± 2ºC (Note 3).

Maximum: 2.5% after 5 min.

Maximum: 1.5% after 18 hours.

3.4 Persistent foam (MT 47.2) (Note 4)

Maximum: 60 ml after 1 min.

4 Storage stability

4.1 Stability at elevated temperature (MT 46.3)

After storage at 54 ± 2ºC for 14 days (Note 5), the determined active

ingredient must not be lower than 5% relative to the determined average

content found before storage (Note 6) and the formulation shall continue to

comply with the clauses for:

- pH range (3.1);

- wettability (3.2);

- degree of dissolution and solution stability (3.3).

In the case of water soluble bag packaging, the package should be enclosed

in a watertight sachet, box or any other container at 45º C (Note 7) for 6

weeks. The determined average active ingredient content must not be lower

than 5% relative to the determined average content found before storage, and

the formulation shall continue to comply with the clauses for:

- pH range (3.1);

- wettability (3.2);

- dissolution of the bag (5.1);

- degree of dissolution and solution stability (5.2); and

- persistent foam (5.3).

None of the bags tested should show signs of leakage or rupture during

normal handling before and after storage.

5 Material packaged in a water soluble bag (Notes 8, 9, 10)

5.1 Dissolution of the bag (MT176)

The dissolution of the bag shall be tested on a sample of the emptied and

cleaned bag taken according to the procedure described in Note 9, together

with an appropriate proportion of the SP.

Flow time of the suspension: Maximum of 60 seconds.

5.2 Degree of dissolution and solution stability (MT179) (Note 2)

The degree of dissolution and solution stability shall be tested on a solution

containing the SP and the bag material in the actual ratio of application,

prepared according to the procedure described in Note 10.

Residue of formulation retained on a 75 μm test sieve after dissolution in

CIPAC Standard Water D at 30 ± 2ºC (Note 3).

Maximum: 3.0% after 5 min.

Maximum: 1.5% after 18 hours.

5.3 Persistent foam (MT47.2) (Note 4)

The persistent foam shall be tested on a solution containing the SP and the

bag in the actual ratio of application, prepared according to the procedure

described in Note 10.

Foam after 1 minute: Maximum of 60 ml.

METHOMYL SOLUBLE CONCENTRATES

FAO Specification 264/SL (2002)

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 report

(264/2002). 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 report (264/2002) as PART TWO forms an integral

part of this publication.

1 Description

The material shall consist of technical methomyl, complying with the

requirements of FAO specification 264/TC (2002), dissolved in suitable

solvents, together with any necessary formulants (Note 1). It shall be in the

form of a clear to opalescent liquid, free from visible suspended matter and

sediment, to be applied as a true solution of the active ingredient in water.

2 Active ingredient

2.1 Identity tests (264/SL/(M)2, CIPAC handbook H, 1998, p200)

The active ingredient shall comply with an identity test, and where the identity

of the active ingredient is in doubt, shall comply with at least one additional

test.

2.2 Methomyl content (264/SL/(M)2, CIPAC handbook H, 1998, p203) (Note 2)

The methomyl content shall be declared (g/kg or g/l at 20 ± 2ºC) and, when

determined, the content obtained shall not differ from that declared by the

appropriate tolerance:

Declared content of active                Permitted Tolerance

ingredient in g/kg

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

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

Note In each range the upper limit is included

3 Physical properties

3.1 pH range (MT 75)

pH range: 4 to 8

3.2 Solution stability (MT 41)

The formulation, after the stability test at 54ºC (see 4.2) and following dilution

(Note 3) with CIPAC standard water D and standing at 30 ± 2º C for 18 hours,

shall give a clear or opalescent solution, free from more than a trace of

sediment and visible solid particles. Any visible sediment or particles

produced shall pass through a 45 μm test sieve.

3.3 Persistent foam (MT47.2) (Note 4)

Maximum: 60 ml after 1 minute.

4 Storage stability

4.1 Stability at 0 ºC (MT 39.3)

After storage 0 ± 2ºC for 7 days, the volume of solid and/or liquid which

separates shall not be more than 0.3 ml.

4.2 Stability at elevated temperature (MT 46.3)

After storage at 54 ± 2ºC for 14 days, the determined active ingredient must

not be lower than 5% relative to the determined average content found before

storage (Note 5) and the formulation shall continue to comply with the clause

for:

- pH range (3.1).