Identity

ISO common name:

thiram

Chemical name

IUPAC

tetramethylthiuram disulfide

bis(dimethylthiocarbamoyl) disulfide

CA

tetramethylthioperoxydicarbonic diamide

CAS registry no:

137-26-8

CIPAC no:

24

EEC no:

205-286-2

Structural formula:

Molecular formula:

C₆H₁₂N₂S₄

Molecular mass:

240.4

Physical and chemical properties

Pure active ingredient

Vapour pressure:

2.3 mPa at 25°C (by gas saturation method, Lemal 1985).

Melting point:

155-156°C.

Octanol/water partition coefficient:

54 ± 14. Log P_ow 1.73 (Lemal, 1983).

Solubility:

16.5 mg/l in water at 20° ± 1°C.

69.7 g/l in acetone at 25°C

205 g/l in chloroform at 25°C

<10 g/l in ethanol at 25°C

Specific gravity:

1.36 g/cm³ at 20°C.

Hydrolysis:

half-life <1 day at pH 9

half-life 6 days at pH 7

half-life 77 days at pH 5

Photolysis:

photodegradation half-life in water at pH 5 and 25°C is 8.8 hours

Lemal (1985) measured the vapour pressure of thiram by a gas saturation method. Nitrogen gas was passed through thiram coated on a support material with a very high surface area and maintained at 25°C, then through a cotton wool dust filter followed by traps containing methanol. The contents of the absorption traps were analysed by HPLC. The vapour pressure was calculated from the volume of nitrogen passed through the apparatus and the amount of thiram collected in the trap. In two runs the measured vapour pressure at 25°C was 2.4 and 2.2 mPa.

Lemal (1983) measured the octanol-water partition coefficient of thiram according to OECD Guideline 107 (OECD 1981). In a series of tests the values for log P_ow ranged from 1.568 to 1.851, with a median value of 1.782 and a mean of 1.734.

Technical material

Purity:

98.5%

Melting range:

135-146°C.

Formulations

80WG

water dispersible granules containing 800 g/kg thiram.

80WP

wettable powder containing 800 g/kg thiram.

75WG

water dispersible granules containing 750 g/kg thiram.

65WP

wettable powder containing 650 g/kg thiram.

50WG

water dispersible granules containing 500 g/kg thiram.

Combinations with other fungicides:

SILBOS

DF water dispersible granules containing 640 g/kg thiram.

SILBOS T

wettable powder containing 640 g/kg thiram.

DIRAC

Express water dispersible granules containing 530 g/kg thiram.

RONILAN T

wettable powder containing 530 g/kg thiram.

ISO common name:		thiram
Chemical name
	IUPAC	tetramethylthiuram disulfide
		bis(dimethylthiocarbamoyl) disulfide
	CA	tetramethylthioperoxydicarbonic diamide
CAS registry no:		137-26-8
CIPAC no:		24
EEC no:		205-286-2
Structural formula:
Molecular formula:			C₆H₁₂N₂S₄
Molecular mass:			240.4

Vapour pressure:	2.3 mPa at 25°C (by gas saturation method, Lemal 1985).
Melting point:	155-156°C.
Octanol/water partition coefficient:	54 ± 14. Log P_ow 1.73 (Lemal, 1983).
Solubility:	16.5 mg/l in water at 20° ± 1°C.
	69.7 g/l in acetone at 25°C
	205 g/l in chloroform at 25°C
	<10 g/l in ethanol at 25°C
Specific gravity:	1.36 g/cm³ at 20°C.
Hydrolysis:	half-life <1 day at pH 9
	half-life 6 days at pH 7
	half-life 77 days at pH 5
Photolysis:	photodegradation half-life in water at pH 5 and 25°C is 8.8 hours

80WG	water dispersible granules containing 800 g/kg thiram.
80WP	wettable powder containing 800 g/kg thiram.
75WG	water dispersible granules containing 750 g/kg thiram.
65WP	wettable powder containing 650 g/kg thiram.
50WG	water dispersible granules containing 500 g/kg thiram.
Combinations with other fungicides:
SILBOS	DF water dispersible granules containing 640 g/kg thiram.
SILBOS T	wettable powder containing 640 g/kg thiram.
DIRAC	Express water dispersible granules containing 530 g/kg thiram.
RONILAN T	wettable powder containing 530 g/kg thiram.