Pulsafeeder PULSAlarm - Manual (Page 22)

22
unless generated as an aerosol.
Water: This product has a very low water solubility (< 100 ppb). As it has a specific gravity of
< 1, if discharged to water, it will initially form a surface film. As the product is non
volatile and has a high binding affinity for particulate matter, it will adsorb to
particulates and sediment out.
Soil:
If discharged to surface water, this product will bind to sediment. If discharged in
effluent to a waste water treatment plant, the product is removed from the aqueous
phase by binding to sewage sludge. If the sewage sludge is subsequently spread on
soil, the silicone product is expected to degrade.
Degradation: This product, polydimethylsiloxane, degrades in soil abiotically to form smaller
molecules. These in turn are either biodegraded in soil or volatilized into the air where
they are broken down in the presence of sunlight. Under appropriate conditions, the
ultimate degradation products are inorganic silica, carbon dioxide and water vapour.
Due to the very low water solubility of this product, standard OECD protocols for ready
and inherent biodegradability are not suitable for measuring the biodegradability of this
product. The product is removed >80% during the sewage treatment process.
Environmental Effects
Toxicity to Water Organisms: Based on analogy to similar materials this product is expected to exhibit
low toxicity to aquatic organisms.
Toxicity to Soil Organisms: Experiments show that when sewage sludge containing polydimethylsiloxane
is added to soil, it has no effect on soil micro-organisms, earthworms or subsequent crops grown in the
soil.
Bioaccumulation: This product is a liquid and is a high molecular weight polymer. Due to its physical size
it is unable to pass through, or be absorbed by biological membranes. This has been confirmed by testing
or analogy with similar products.
Fate and Effects in Waste Water Treatment Plants
This product or similar products has been shown to be non-toxic to sewage sludge bacteria.
Ecotoxicity Classification Criteria
Hazard Parameters (LC50 or EC50)
High Medium Low
Acute Aquatic Toxicity (mg/L) <=1 >1 and <=100 >100
Acute Terrestrial Toxicity <=100 >100 and <= 2000 >2000
This table is adapted from "Environmental Toxicology and Risk Assessment", ASTM STP 1179, p.34, 1993.
This table can be used to classify the ecotoxicity of this product when ecotoxicity data is listed above. Please read the other
information presented in the section concerning the overall ecological safety of this material.
13. DISPOSAL CONSIDERATIONS
RCRA Hazard Class (40 CFR 261)
When a decision is made to discard this material, as received, is it classified as a hazardous waste? No
State or local laws may impose additional regulatory requirements regarding disposal.
Call Dow Corning Corporate Environmental Management, (517) 496-6315, if additional information is
required.
14. TRANSPORT INFORMATION
DOT Road Shipment Information (49 CFR 172.101)
Not subject to DOT.
Ocean Shipment (IMDG) Not subject to IMDG code.
Air Shipment (ICAO) Not subject to ICAO regulations.
Call Dow Corning Transporation, (517) 496-8577, if additional information is required.
15. REGULATORY INFORMATION
Contents of this MSDS comply with the OSHA Hazard Communication Standard 29 CFR 1910.1200.
TSCA Status: All chemical substances in this material are included on or exempted from listing on the
TSCA Inventory of Chemical Substances.
EPA SARA Title III Chemical Listings
Section 302 Extremely Hazardous Substances:
None.