Dimethyl isophthalate

194.18

194.18

215-951-9

2UY9Y3574K

15313

DTXSID8027402

Needles from dilute alcohol|... Solid at room temperature.

2917399090

52.6

2.2

OtherSolid

1.194 g/cm³ @ Temp: 20 °C

67.5 °C

282 °C

148.0±7.9 °C

1.515

In water, 290 mg/L, temperature not specified

Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.

9.63X10-3 mm Hg at 25 deg C /estimated/

6.8 (vs air)

Henry's Law constant = 6.14X10-8 amt-cu m/mol at 25 °C (est)

Phthalate esters would be expected to have UV maxima in the 230 nm and 270 nm regions. /Phthalate esters/|... Resistance to migration from polymers, low temperature flexibility ... compatibility with polar polymers and additives over a wide range of compositions. /Phthalate esters/|Hydroxyl radical reaction rate constant = 6.36X10-13 cu cm/molec-sec at 25 °C (est)

NONH for all modes of transport

3

R36

S26-S36

NT2540000

Xi:Irritant;

Stable at room temperature in closed containers under normal storage and handling conditions.

P305 + P351 + P338

H319

SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational exposure or environmental contamination. Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air quality; potential migration in soil or water; effects on animal, aquatic, and plant life; and conformance with environmental and public health regulations.

ITC/USEPA; Information Review #304 (Draft) Dimethyl Isophthalate (1982)

|Warning|H319 (100%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]|P264, P280, P305+P351+P338, and P337+P313|Aggregated GHS information provided by 85 companies from 4 notifications to the ECHA C&L Inventory.

Water or foam may cause frothing.

SRP: Local exhaust ventilation should be applied wherever there is an incidence of point source emissions or dispersion of regulated contaminants in the work area. Ventilation control of the contaminant as close to its point of generation is both the most economical and safest method to minimize personnel exposure to airborne contaminants.

| 1 - Materials that, under emergency conditions, can cause significant irritation.| 1 - Materials that must be preheated before ignition can occur. Materials require considerable preheating, under all ambient temperature conditions, before ignition and combustion can occur.| 0 - Materials that in themselves are normally stable, even under fire conditions.

LD50 Rat oral 4390 mg/kg

The identification of dimethyl isophthalate in surface waters near, and shortly after the Mount St. Helens volcano erupted is believed to be due to the destructive pyrolysis of surrounding conifers and other organic matter(1).

Dimethyl isophthalate's production and use as a polyacrylate resin comonomer and as a perfume fixative(1) may result in its release to the environment through various waste streams(SRC).

TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 36(SRC), determined from a structure estimation method(2), indicates that dimethyl isophthalate is expected to have very high mobility in soil(SRC). Volatilization of dimethyl isophthalate from moist soil surfaces is not expected to be an important fate process(SRC) given an estimated Henry's Law constant of 6.1X10-8 atm-cu m/mole(SRC), using a fragment constant estimation method(3). Dimethyl isophthalate is not expected to volatilize from dry soil surfaces(SRC) based upon an estimated vapor pressure of 9.6X10-3 mm Hg(4). Dimethyl isophthalate, present at 100 mg/L, reached 94 to 102% of its theoretical BOD after 2 weeks using an activated sludge inoculum(5).|AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 36(SRC), determined from a structure estimation method(2), indicates that dimethyl isophthalate is not expected to adsorb to suspended solids and sediment(SRC). Volatilization from water surfaces is not expected(3) based upon an estimated Henry's Law constant of 6.1X10-8 atm-cu m/mole(SRC), developed using a fragment constant estimation method(4). According to a classification scheme(5), an estimated BCF of 4(SRC), from an estimated log Kow of 1.66(6) and a regression-derived equation(7), suggests the potential for bioconcentration in aquatic organisms is low(SRC). Hydrolysis is not expected to be an important process(SRC) based on estimated hydrolysis half-lives of 350 and 35 days at pHs 7 and 8, respectively(8). Dimethyl isophthalate, present at 100 mg/L, reached 94 to 102% of its theoretical BOD after 2 weeks using an activated sludge inoculum(9).|ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), dimethyl isophthalate, which has an estimated vapor pressure of 9.6X10-3 mm Hg at 25 °C(2), is expected to exist solely as a vapor in the ambient atmosphere. Vapor-phase dimethyl isophthalate is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals(SRC); the half-life for this reaction in air is estimated to be 25 days(SRC), calculated from its rate constant of 6.4X10-13 cu cm/molecule-sec at 25 °C(SRC) that was derived using a structure estimation method(3). Dimethyl isophthalate does contain chromophores that absorb at wavelengths >290 nm(4) and therefore may be susceptible to direct photolysis by sunlight(SRC).

The rate constant for the vapor-phase reaction of dimethyl isophthalate with photochemically-produced hydroxyl radicals has been estimated as 6.4X10-13 cu cm/molecule-sec at 25 °C(SRC) using a structure estimation method(1). This corresponds to an atmospheric half-life of about 25 days at an atmospheric concentration of 5X10+5 hydroxyl radicals per cu cm(1). A base-catalyzed second-order hydrolysis rate constant of 0.23 L/mole-sec(SRC) was estimated using a structure estimation method(2); this corresponds to half-lives of 350 and 35 days at pH values of 7 and 8, respectively(2). Dimethyl isophthalate does contain chromophores that absorb at wavelengths >290 nm(3) and therefore may be susceptible to direct photolysis by sunlight(SRC).

An estimated BCF of 4 was calculated in fish for dimethyl isophthalate(SRC), using an estimated log Kow of 1.66(1) and a regression-derived equation(2). According to a classification scheme(3), this BCF suggests the potential for bioconcentration in aquatic organisms is low(SRC).

Using a structure estimation method based on molecular connectivity indices(1), the Koc of dimethyl isophthalate can be estimated to be 36(SRC). According to a classification scheme(2), this estimated Koc value suggests that dimethyl isophthalate is expected to have very high mobility in soil.

The Henry's Law constant for dimethyl isophthalate is estimated as 6.1X10-8 atm-cu m/mole(SRC) using a fragment constant estimation method(1). This Henry's Law constant indicates that dimethyl isophthalate is expected to be essentially nonvolatile from water surfaces(2). Dimethyl isophthalate is not expected to volatilize from dry soil surfaces(SRC) based upon an estimated vapor pressure of 9.6X10-3 mm Hg(3).

SURFACE WATER: Dimethyl isophthalate was identified as a major peak in a sample from Smith Creek, Sept 1980, near, and shortly after the Mt. St. Helens explosion and was also identified in analysis of lake water samples taken at the same time (Spirit Lake, South Fork Castle Lake)(1).

Occupational exposure to dimethyl phthalate may occur through inhalation of aerosols and dermal contact with this compound at workplaces where dimethyl isophthalate is produced or used. Use data indicate that the general population may be exposed to dimethyl isophthalate via dermal contact with and inhalation of products containing this compound. (SRC)

/ALTERNATIVE and IN VITRO TESTS/ Comparative toxicity of phthalate esters to HeLa-S3 cells was studied by determining their effect on doubling time of the cells. The toxicity of the esters decreasing in order: diethyl phthalate, butyl phthalyl butyl glycolate, di-iso-butyl phthalate, ethyl phthalyl ethyl glycolate, bis(2-ethylhexyl) phthalate, dimethyl isophthalate, dibutyl phthalate, methyl phthalyl ethyl glycolate, dimethyl phthalate, and dioctyl phthalate.

Plastic material and resin manufacturing|1,3-Benzenedicarboxylic acid, 1,3-dimethyl ester: ACTIVE|"Morflex 1129" [Reilly] ... trademark for chemical intermediate