Phosphorodithioic acid, mixed O,O-bis(sec-Bu and 1,3-dimethylbutyl) esters, zinc salts

Storage stability and reactivity towards container material

Administrative data

Endpoint:

storage stability and reactivity towards container material

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Cross-reference

Reason / purpose for cross-reference:

reference to other study

Results and discussion

Transformation products:

no

Applicant's summary and conclusion

Conclusions:

This substance is expected to be stable under normal ambient conditions of temperature and pressure. Over time, there is the potential that H2S vapours can accumulate in storage vessel head space, and exposure to this gas must be avoided.

Executive summary:

Storage Stability

Justification For Waiving (ECHA TGD refs 7.1.10, 7.1.11, and 7.1.13)

 

 

This substance is considered stable under normal ambient and anticipated storage and handling condition of temperature and pressure.  Over long periods of storage, especially in regions where ambient temperature may approach 100 deg F (or more), H2S gas may accumulate in storage container headspaces, and exposure to this gas must be avoided. 

 

Precautionary Measures:Proper handling and storage temperatures for this material are time and temperature dependent and are necessary to avoid decomposition that releases hazardous fumes described in Section 3 (Potential Health Effects) and Section 10 (Stability and Reactivity).   If adequate engineering controls are used, short term activities such as loading, unloading and in-line blending may occur at temperatures ranging from 80-85°C (176-185°F). During shipment by railcar or tank truck, loading temperatures as high as 80-85°C (176-185°F) may be used and are expected to drop to 66°C (150°F) or lower within 7 days. Storage temperatures for up to 2 weeks should not exceed 66°C (150°F). The recommended long-term (2 weeks or more) storage temperature is ambient to 45°C (113°F) maximum.  Do not get in eyes, on skin, or on clothing. Do not breathe vapor or fumes from heated material. Avoid contact of heated material with eyes, skin, and clothing. Do not breathe vapor or fumes. Wash thoroughly after handling.

 

Unusual Handling Hazards:Toxic quantities of hydrogen sulfide (H2S) may be present in storage tanks and bulk transport vessels which contain or have contained this material. Persons opening or entering these compartments should first determine if H2S is present. See Exposure Controls/Personal Protection -Section 8. Do not attempt rescue of a person over exposed to H2S without wearing approved supplied-air or self-contained breathing equipment. If there is a potential for exceeding one-half the occupational exposure standard, monitoring of hydrogen sulfide levels is required. Since the sense of smell cannot be relied upon to detect the presence of H2S, the concentration should be measured by the use of fixed or portable devices.

 

General Handling Information:The recommended reheating medium is hot water or regulated low pressure steam. Care must be taken not to exceed the temperatures stated above when reheating this material in order to avoid decomposition that releases hazardous fumes. Avoid contaminating soil or releasing this material into sewage and drainage systems and bodies of water.

 

 

Dr. Thomas F. Buckley III