Olin (OLN) 8-K Regulation FD Disclosure

1

Longbow Research

Basic Materials
Investor ConferenceMarch 10, 2011

Exhibit 99.1

2

Olin Representatives

John E. Fischer

Senior Vice President & Chief Financial Officer

Larry P. Kromidas

Assistant Treasurer & Director, Investor Relations

lpkromidas@olin.com

(618) 258 - 3206

3

Company Overview

All financial data are for the years ending December 31, 2010 and 2009, and are presented in millions of U.S. dollars except for
earnings per share.Additional information is available on Olin’s websitewww.olin.com in the Investors section.

Winchester

Chlor Alkali

Third Largest North American
Producer of Chlorine and Caustic Soda

FY 2010FY 2009

Revenue:$1,037$ 964

Income:$117$125

A Leading North American Producer
of Small Caliber Ammunition

FY 2010FY 2009

Revenue:$ 549$ 568

Income:$63$69

Revenue:$ 1,586$ 1,532

EBITDA:$188$292

Pretax Operating Inc.:$77$210

EPS (Diluted):$.81$1.73

FY 2010FY 2009

Olin

4

Investment Rationale

•Leading North American producer of Chlor-Alkali

•Strategically positioned facilities

•Diverse end customer base

•Favorable industry dynamics

•Leading producer of industrial bleach with additional
growth opportunities

•Pioneer synergies improved chlor-alkali price structure

•Winchester’s leading industry position

5

Acquisition of PolyOne’s
Interest in SunBelt

•On February 28, 2011, Olin purchased PolyOne’s 50%
interest in SunBelt for $132.3 million in cash plus the
assumption of a PolyOne guarantee related to the SunBelt
Partnership debt

•Olin and PolyOne agreed to a three year earn out based on
the performance of SunBelt

•The SunBelt 352,000 ton membrane plant located within
Olin’s McIntosh, AL facility, which has been operated by
Olin since 1997, is now 100% owned by Olin

•Olin expects to record a non-cash, pretax gain of more
than $80 million as a result of revaluing its interest in the
SunBelt Partnership

6

SunBelt Acquisition Benefits

•Olin expects the acquisition to be accretive to
both EBITDA and earnings in 2011

•SunBelt currently has the lowest cash
manufacturing costs in the Olin system

•SunBelt has a long-term contract for 250,000
tons of chlorine per year

•Expected annual synergies of $5-10 million
associated with increased use of low cost
capacity and increased sales of membrane grade
caustic soda

7

Chlor Alkali Segment

ECU = Electrochemical Unit; a unit of measure reflecting the chlor alkali process outputs
of 1 ton of chlorine, 1.13 tons of 100% caustic soda and 0.3 tons of hydrogen.

N. American
Position

% 2010
Revenue

#2

#3

#1
Industrial

#1
Merchant

#1
Burner
Grade

42%

10%

4%

11%

32%

1%

Chlor Alkali Manufacturing Process

BRINE+ELECTROLYSIS=OUTPUTS

Caustic Soda - 1.13 Tons

(Sodium Hydroxide)

(Potassium Hydroxide)

Bleach

(Sodium Hypochlorite)

Chlorine - 1 Ton

Potassium Chloride

or

Sodium Chloride

KOH - 1.59 Tons

HCl

(Hydrochloric Acid)

Hydrogen Gas - 0.3 Tons

KOH

or

Caustic Soda

Chlorine

Hydrogen

1.8 Tons Salt &

.5 Tons Water

2.8 Megawatts Electricity

8

Olin is #3 Chlor-alkali Producer

Source: CMAI/Olin - 2010 year-end figures

Oxy includes OxyVinyls and Olin includes 100% of SunBelt.

9

Mercury Transition Plan

•The North American Chlor Alkali industry has been moving
away from manufacturing chlorine and caustic soda using
mercury cell technology due to customer product de-selection
and threats of potential legislation

•Olin currently operates 2 mercury cell plants representing
approximately 360,000 ECUs or 17% of our total capacity *

•By the end of 2012, Olin expects to convert 200,000 ECUs
of mercury cell technology to membrane technology and will
shutdown the remaining 160,000 ECUs

•Estimated cost is $160 million over 2 years, aided by $41
million of low-cost Tennessee-sponsored tax-exempt debt

* Olin’s total capacity includes 100% ownership of the SunBelt JV

10

Capacity Rationalization

Favorable Industry Dynamics

Target

Acquisition
Date

Position

2007

2004

•Acquired by Olin

•725,000 Short Tons ECU Capacity

•4.7% of North American capacity

•Acquired by OxyChem

•859,000 Short Tons ECU Capacity

•5.5% of North American capacity

Source: CMAI.

Pioneer

Vulcan

Industry Consolidation

1.4 mm MT
net capacity

reduction; or

9% of 2000

capacity

mmMT

14.2

15.6

2010

2000

2010

•Cydsa/Iquisa acquires 45,000 ton
membrane plant from Mexichem

Mexichem

2011

•Olin acquires SunBelt interest

•176,000 Short Tons ECU Capacity

PolyOne

Olin announced capacity reductions expected to be in place by 12/31/2012

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Diverse Customer Base

Chlorine

Caustic Soda

North American Industry

Olin Corporation

Source: CMAI and Olin 2010 demand .Includes sales of SunBelt joint venture.

Chlorine: “Organics” includes: Propylene oxide, epichlorohydrin, MDI, TDI, polycarbonates. “Inorganics” includes: Titanium dioxide and bromine.

Caustic Soda: “Organics” includes: MDI, TDI, polycarbonates, synthetic glycerin, sodium formate, monosodium glutamate. “Inorganics” includes: titanium dioxide, sodium silicates, sodium cyanide.

12

Bleach Plants

39

Tacoma, WA

Tracy, CA

Santa Fe Springs, CA

Henderson, NV

St. Gabriel, LA

Augusta, GA

Charleston, TN

Niagara Falls, NY

Becancour,

Quebec

Olin’sGeographicAdvantage

Location	Chlorine Capacity (000s Short Tons)
McIntosh, AL	426 Diaphragm
McIntosh, AL - SunBelt	352 Membrane
Becancour, Quebec	252 Diaphragm 65 Membrane
Niagara Falls, NY	300 Membrane
Charleston, TN (1)	260 Mercury
St. Gabriel, LA	246 Membrane
Henderson, NV	153 Diaphragm
Augusta, GA (1)	100 Mercury
Total	2,154

•Access to regional customers including bleach and water treatment

•Access to alternative energy sources

–Coal, hydroelectric, nuclear, natural gas

(1)Announced the conversion of 200,000 tons of mercury cell technology to membrane cell technology at the Charleston, TN facility

and the closure of the mercury cell facility in Augusta, GA, both are expected to be completed by 12/31/12.

13

Why Industrial Bleach?

•Olin is the leading North American bleach producer with 18% market
share and current installed capacity to service 25% of the market with
low-cost expansion opportunities

•Bleach utilizes both chlorine and caustic soda in an ECU ratio

•Bleach commands a premium price over an ECU

•Demand is not materially impacted by economic cycles

•Regional nature of the bleach business benefits Olin’s geographic
diversity, further enhanced by Olin’s proprietary railcar technology to
reach distant customers

•Low salt, high strength bleach investment will lower freight costs

•Bleach volumes accounted for almost 10% of total 2010 ECUs
produced; these volumes are expected to grow to 15% to 20% in 2011

14

Chlor-Alkali Outlook

•Q4 2010 ECU netbacks of $515 are up $50 over Q3 2010;
Q1 2011 netbacks and volumes are expected to improve

•Positive price momentum as evidenced by chlorine and
caustic price announcements since 2010:

ChlorineCaustic Soda

February 2010$80

May 2010$50$35 / $50

August 2010$40 and $45

September 2010$50

January 2011$40

March 2011$60

•Q4 2010 operating rates improved to 80% from 70% in Q4
2009 reflecting volume improvements in bleach, caustic,
chlorine, HCL and KOH.

15

Winchester Segment

Winchester Strategy

•Leverage existing strengths

–Seek new opportunities
to leverage the
legendary Winchester®
brand name

–Investments that
maintain Winchester as
the retail brand of
choice, and lower costs

•Focus on product line
growth

–Continue to develop
new product offerings

•Provide returns in excess of
cost of capital

	Hunters & Recreational Shooters
Products	Retail	Distributors	Mass Merchants	Law Enforcement	Military	Industrial
Rifle	ü	ü	ü	ü	ü
Handgun	ü	ü	ü	ü	ü
Rimfire	ü	ü	ü	ü	ü	ü
Shotshell	ü	ü	ü	ü	ü	ü
Components	ü	ü	ü	ü	ü	ü

Brands

16

Favorable Industry Dynamics

Commercial

•Economic environment leading to personal security concerns

•Fears of increased gun/ammunition control due to change in administration

•New gun and ammunition products

•Strong hunting activity in weak economy, driven by cost/benefit of hunting
for food and increased discretionary time

Law
Enforcement

•Significant new federal agency contracts and solid federal law enforcement
funding

•Higher numbers of law enforcement officers and increase in federal agency
hiring

•Increased firearms training requirements among state and local law
enforcement agencies

Military

•Sustained high demand for small caliber ammunition due to wars in Iraq and
Afghanistan

•Commitment to maintaining the “Second-Source Program” to mitigate the
risk of a sole-source small caliber ammunition contract

17

Winchester

•2010 segment earnings of $63 million are second best ever
following record 2009 earnings of $69 million

•Olin believes surge has ended, but with higher military and law
enforcement component, we expect financial results will exceed
pre-surge levels

•Long-term military and law enforcement agency contract sales
accounted for approximately 30% of segment revenue in 2010

•Winchester was awarded approximately $110 million of new
military and law enforcement business in 2010

•New gun ownership is expected to translate into higher long-term
ammunition consumption

•Commercial backlog has declined, but military and law
enforcement backlog has increased

18

Centerfire Relocation

•The decision to relocate Winchester’s centerfire operations,
including 1,000 jobs, was made on November 3, 2010

•The controlled relocation process is expected to take up to 5
years to complete assuring that high quality product is
available for our customers

•In 2011, we expect a $4 to $5 million negative pretax impact
on earnings associated with the relocation project

•Annual operating costs are forecast to be reduced by $30
million once the move is complete

•The net project cost is estimated to be $80 million, of which
approximately $50 million is related to capital expenditures

•$42 million of low-cost Mississippi-sponsored tax-exempt
debt has been made available to the company

19

Financial Highlights

•Strong Balance Sheet

–Year end 2010 cash balance of $561 million reflects $117
million of the $153 million AL, MS and TN bond proceeds,
the balance to be drawn during 2011

–Pension plans remain fully funded with no contributions
expected until at least 2013

–2011 CAPEX is forecast to be $230-$250 million reflecting
the mercury conversion and Oxford relocation costs

•Profit Outlook

–ECU pricing trends are positive

–Higher margin bleach business is growing

–Acquisition of PolyOne’s interest in SunBelt is expected to
be accretive to EBITDA and earnings in 2011

20

Forward-Looking Statements

This presentation contains estimates of future
performance, which are forward-looking
statements and actual results could differ
materially from those anticipated in the forward-
looking statements.Some of the factors that could
cause actual results to differ are described in the
business and outlook sections of Olin’s Form 10-K
for the year ended December 31, 2010. These
reports are filed with the U.S. Securities and
Exchange Commission.