Clothianidin TC, WDG

Clothianidin TC, WDG

Clothianidin Technical Material - 738/TC/1 (September 2021)

WHO specification 738/TC/1 (September 2021)

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 (738/2015.1, 738/2018.2, 738/2020.2). The specification should be applicable to TC produced by these manufacturers, but it is not an endorsement of those products nor a guarantee that they comply with the specification. The specification may not be appropriate for TC produced by other manufacturers. The evaluation reports (738/2015.1, 738/2018.2, 738/2020.2), as PART TWO, form an integral part of this publication.

1 Description

The material shall consist of clothianidin together with related manufacturing impurities and shall be white to pale yellow crystalline powder free from visible extraneous matter and added modifying agents.

2 Active ingredient

2.1 Identity tests (738/TC/M/2, CIPAC Handbook N, p.15, 2012)

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 Clothianidin content (738/TC/M/3, CIPAC Handbook N, p.15, 2012)

The clothianidin 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.

Clothianidin Water Dispersible Granules - 738/WG (September 2021)

WHO specification 738/WG (December 2021)

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 (738/2015.1, 738/2018.1, 738/2020.3). The specification should be applicable to relevant products of these manufacturers and those of any other formulators who use only TC from the evaluated sources. The specification is not an endorsement of those products nor a guarantee that they comply with the specification. The specification may not be appropriate for the products of other manufacturers who use TC from other sources. The evaluation reports (738/2015.1, 738/2018.1, 738/2020.3), as PART TWO, form an integral part of this publication.

1 Description

The material shall consist of a homogeneous mixture of technical clothianidin, complying with the requirements of the WHO specification 738/TC, in the form of off-white to brown granules with faint characteristic odour, together with carriers 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, nearly dust-free or essentially non-dusty, and free from visible extraneous matter and hard lumps.

2 Active ingredient

2.1 Identity tests (738/WG/M/2, CIPAC Handbook N, p.17, 2012)

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 Clothianidin content (738/WG/M/3, CIPAC Handbook N, p.18, 2012) (Note 1)

The clothianidin content shall be declared (500 g/kg) and, when determined, the average content measured shall not differ from that declared by more than ± 5%.

3 Physical properties

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

The formulation shall be completely wetted in 1 minute without swirling.

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

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

3.3 Dispersibility (MT 174, CIPAC Handbook F, p.435, 1995)

Dispersibility: minimum 80% after 1 minute of stirring.

3.4 Suspensibility (MT 184.1, CIPAC Handbook P, p.245, 2021) (Notes 2 and 3)

Suspensibility: minimum 60% after 30 minutes in CIPAC Standard Water D at 25 ± 5°C.

3.5 Persistent foam (MT 47.3, CIPAC Handbook O, p.177, 2017) (Note 4)

Maximum: 70 ml after 1 minute.

3.6 Dustiness (MT 171.1, CIPAC Handbook P, p.235, 2021) (Note 5)

The formulation shall have a maximum collected dust of 30 mg by the gravimetric method.

3.7 Flowability (MT 172.2, CIPAC Handbook P, p.241, 2021)

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, CIPAC Handbook P, p.22, 2021)

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 6), and the formulation shall continue to comply with the clauses for:

• wet sieve test (3.2)

• dispersibility (3.3)

• suspensibility (3.4)

• dustiness (3.6)

• attrition resistance (3.8).