January 9, 2005

MEMORANDUM

Subject: Product Chemistry Science Chapter for n-Alkyl (60% C~14~, 30%
C~16~, 5% C~12~, 5 % C~18~) dimethyl benzyl ammonium chloride

To: A. Najm Shamim, Ph.D Risk Assessor for ADBAC RED

Regulatory Management Branch II

Antimicrobials Division (7510C)

And

Jacqueline Campbell-McFarlane, CRM for ADBAC RED

Regulatory Management Branch I

Antimicrobials Division (7510C)

From: Chris Jiang, Chemist

Product Science Branch

Antimicrobials Division (7510C)

Thru: Karen P. Hicks, CTT Team Leader

Product Science Branch

Antimicrobials Division (7510C)

And

Michele Wingfield, Branch Chief

Product Science Branch

Antimicrobials Division (7510C)

DP Barcode: D324587 Chemical Code: 035603

EPA Reg. No.: 3377-38 MRID #=s: 44467401

44467402

44467403

> Enclosed is the Science Chapter for the for n-Alkyl (60% C~14~, 30%
> C~16~, 5% C~12~, 5 % C~18~)
>
> Dimethyl Benzyl Ammonium Chloride Reregistration Eligibility Decision
> (RED).

Science Chapter on for n-Alkyl (60% C~14~, 30% C~16~, 5% C~12~, 5 %
C~18~) Dimethyl Benzyl Ammonium Chloride

(MRID #=s: 44467401, 44467402, 44467403)

Product Chemistry

Case Overview

**[Chemical Overview]{.underline}**

> The main ingredient covered for this Science Chapter is: **n-Alkyl
> (60% C~14~, 30 % C~16~,**

**5 % C~12~, 5% C~18~) Dimethyl Benzyl Ammonium Chloride**

> Chemical Name: n-Alkyl (60% C~14~, 30 % C~16~, 5 % C~12~, 5% C~18~)
> dimethyl benzyl ammonium chloride
>
> Common/Trade Names: ADBAC
>
> Chemical Family: Quaternary amines

CAS Registry Number: 68391-01-5

OPP Chemical Code: 069104

Molecular Formula: RC~9~H~13~NCl

> (R = n-Alkyl (60% C~14~, 30 % C~16~, 5 % C~12~, 5% C~18~))
>
> Molecular Weight: 377.83

**[SCIENCE ASSESSMENT]{.underline}**

> The Agency thoroughly reviewed the registrants= submissions (in-house
> literature) for the purpose of

determining the reregistration eligibility of n-alkyl (60% C~14~, 30 %
C~16~, 5 % C~12~, 5% C~18~) dimethyl benzyl ammonium chloride for use in
wood preservatives, in material preservatives, in industrial processes
and water systems, and in commercial , institutional, and residential
premises.

**Product Chemistry Assessment**

> The physical and chemical characteristics of n-alkyl (60% C~14~, 30 %
> C~16~, 5 % C~12~, 5% C~18~)

dimethyl benzyl ammonium chloride are described below.

Technical Grade Active Ingredient (TGAI):

> Chemical Name: n-Alkyl (60% C~14~, 30 % C~16~, 5 % C~12~, 5% C~18~)
> dimethyl benzyl ammonium chloride

Molecular Wt. 377.83

Color: 50 APHA units

Physical State: Liquid

Odor: Ethanolic

\*Melting Point: 241.02 ^o^C

> Boiling Point: Could not be established because test article is a
> multi-component system with each component boiling at a different
> temperature

Density: 0.9429 g/cm^3^ at 25 ^o^C

Water Solubility: Completely soluble

\*Vapor Pressure: 3.53 x 10^-12^ mm Hg

Dissociation Constant: Not applicable

\*log K~ow~: 3.9104

pH: 7.59

Stability: Stable with respect to metal, nonmetal, temperature, and
light

Oxidizing/Reducing Potential: Not applicable as product does not contain
oxidizers or reducers

Flash Point: 37.0 ^o^C

Explodability: Not applicable for liquids which are not potentially
explosive

Viscosity: 507.0 cSt 25 ^o^C

Miscibility: Not applicable as product is not to be mixed with petroleum
solvents

Corrosion Characteristics Corrosive to stainless steel and no corrosion
to HDPE

Dielectric breakdown voltage: Not applicable as product is not to be
used near electrical equipment

\*-Values obtained from EpiSuite

> n-Alkyl (60% C~14~, 30 % C~16~, 5 % C~12~, 5% C~18~) dimethyl benzyl
> ammonium chloride

PRODUCT CHEMISTRY

BIBLIOGRAPHY

US EPA=s MRID #: 44467401, Albemarle BQ1416-8 Biocide\--Product
Chemistry, (1998) Albemarle Corp., Lab Project Number 8382-141 Quat 6,
Albemarle Corporation.

> US EPA=s MRID #: 44467402, Tolbert, A., Product Chemistry Chemical
> Characterization for Determining

Identity and Purity of 80% n-Alkyl (60% C~14~, 30 % C~16~, 5 % C~12~, 5%
C~18~) Dimethyl Benzyl Ammonium Chloride, (1998), Lab Project Number
Quat 6B, Albemarle Corporation.

> US EPA=s MRID #: 44467403, Tolbert, A., Product Chemistry Chemical
> Characterization for Determining

the Physical and Chemical Properties, and Accelerated Storage Stability
of 80% n-Alkyl (60% C~14~, 30 % C~16~,

5 % C~12~, 5% C~18~) Dimethyl Benzyl Ammonium Chloride, (1998), Lab
Project Number Quat 6A, Albemarle Corporation.

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