1

Dave Weidman, President and CEOJohn J. Gallagher III, Executive Vice President and CFO

Celanese 2Q 2006 EarningsConference Call / WebcastTuesday, August 1, 2006 10:00 a.m. CT

2

Forward Looking Statements, Reconciliation and Use of Non-GAAP Measures to U.S. GAAP

This release may contain “forward-looking statements,” which include information concerning the company’s plans, objectives, goals, strategies, future revenues or performance, capital expenditures, financing needs and other information that is not historical information. When used in this release, the words “outlook,” “forecast,” “estimates,” “expects,” “anticipates,” “projects,” “plans,” “intends,” “believes,” and variations of such words or similar expressions are intended to identify forward-looking statements. All forward-looking statements are based upon current expectations and beliefs and various assumptions. There can be no assurance that the company will realize these expectations or that these beliefs will prove correct.

There are a number of risks and uncertainties that could cause actual results to differ materially from the forward-looking statements contained in this release. Numerous factors, many of which are beyond the company’s control, could cause actual results to differ materially from those expressed as forward-looking statements. Certain of these risk factors are discussed in the company’s filings with the Securities and Exchange Commission. Any forward-looking statement speaks only as of the date on which it is made, and the company undertakes no obligation to update any forward-looking statements to reflect events or circumstances after the date on which it is made or to reflect the occurrence of anticipated or unanticipated events or circumstances. This release reflects three performance measures, operating EBITDA, adjusted earnings per share and net debt as non-U.S. GAAP measures. The most directly comparable financial measure presented in accordance with U.S. GAAP in our consolidated financial statements for operating EBITDA is operating profit; for adjusted earnings per share is earnings per common share-diluted; and for net debt is total debt. Use of Non-U.S. GAAP Financial Information

Operating EBITDA, a measure used by management to measure performance, is defined as operating profit from continuing operations, plus equity in net earnings from affiliates, other income and depreciation and amortization, and further adjusted for special charges and other adjustments. Our management believes operating EBITDA is useful to investors because it is one of the primary measures our management uses for its planning and budgeting processes and to monitor and evaluate financial and operating results. Operating EBITDA is not a recognized term under U.S. GAAP and does not purport to be an alternative to operating profit as a measure of operating performance or to cash flows from operating activities as a measure of liquidity. Because not all companies use identical calculations, this presentation of operating EBITDA may not be comparable to other similarly titled measures of other companies. Additionally, operating EBITDA is not intended to be a measure of free cash flow for management’s discretionary use, as it does not consider certain cash requirements such as interest payments, tax payments and debt service requirements nor does it represent the amount used in our debt covenants.

Adjusted earnings per share is a measure used by management to measure performance. It is defined as net earnings (loss) available to common shareholders plus preferred dividends, adjusted for special charges and other adjustments, and divided by the number of basic common shares, diluted preferred shares, and options valued using the treasury method. We believe that the presentation of this non-U.S. GAAP measure provides useful information to management and investors regarding various financial and business trends relating to our financial condition and results of operations, and that when U.S. GAAP information is viewed in conjunction with non-U.S. GAAP information, investors are provided with a more meaningful understanding of our ongoing operating performance. This non-U.S. GAAP information is not intended to be considered in isolation or as a substitute for U.S. GAAP financial information.

Net debt is defined as total debt less cash and cash equivalents. We believe that the presentation of this non-U.S. GAAP measure provides useful information to management and investors regarding changes to the company’s capital structure. Our management and credit analysts use net debt to evaluate the company's capital structure and assess credit quality. This non-U.S. GAAP information is not intended to be considered in isolation or as a substitute for U.S. GAAP financial information.

3

Dave Weidman

President and Chief Executive Officer

4

Celanese Corporation Q2 2006 Highlights

* Based on diluted shares of 172.1 million as of June 30, 2006, and a 28% effective tax rate

Net sales increase 11% from prior year

Operating profit rises 7% on strong business performance, fewer special charges and cost improvement

Diluted adjusted EPS up 34% to $0.71

Operating EBITDA increases 18% to $308 million driven by strong affiliate performance

in $ millions (except EPS) 2nd Qtr 2006 2nd Qtr 2005

Net Sales 1,674 1,506

0.53

262

Diluted Adjusted EPS* 0.71

Operating EBITDA 308

4

5

John J. Gallagher III

Executive Vice President and Chief Financial Officer

6

Celanese Corporation Financial Highlights

in $ millions (except EPS) 2nd Qtr 2006 2nd Qtr 2005Net Sales 1,674 1,506

(135)

152

67

(27)

14

0.53

262

SG&A (153)Operating Profit 163Net Earnings 103Special Items

Special Charges (12)Other Adjustments (13)

Diluted Adjusted EPS* $0.71Operating EBITDA 308

6* Based on diluted shares of 172.1 million as of June 30, 2006, and a 28% effective tax rate

7

Chemical Products

Second Quarter 2006:Strong earnings on continued high utilization across industry, inclusion of sales from Acetex acquisitionSome margin compression in basic chemicals acetyl derivativesHigher dividends from Saudi cost investment (IBN Sina)

Strong integrated chain of acetyl products

in $ millions 2nd Qtr 2006

Net Sales $1,194 up 10%Operating EBITDA $206 up 8%

7

8

Ticona Technical Polymers

Second Quarter 2006:Operating margins expanded on increased sales and reduced spending Increased penetration in key customer segmentsImproved demand in European marketRaw materials continue to be volatile

Focus on increased growth through innovation

in $ millions 2nd Qtr 2006

Net Sales $230 up 3%Operating EBITDA $67 up 22%

8

9

Revitalization still on trackLower volumes on reduced tow sales to China offset by higher pricingReceived $21 million dividends from China affiliate

Performance Products

Stable earnings on continued strong sweetener demandPricing declines consistent with strategy of sales to large-volume customers

Attractive, cash generating businesses

Acetate Productsin $ millions 2nd Qtr 2006

Net Sales $176 up 2%Operating EBITDA $55 up 162%

in $ millions 2nd Qtr 2006

Net Sales $48 up 2%Operating EBITDA $21 up 17%

9

10

Significant Contribution from Equity and Cost Investments

36

10 17 19

14

77

39

0102030405060

1Q 2005 2Q 2005 1Q 2006 2Q 2006

Dividends - Cost InvestmentsDividends - Equity Investments

15 1221 18

147

7

39

0102030405060

1Q 2005 2Q 2005 1Q 2006 2Q 2006

Dividends - Cost InvestmentsEarnings - Equity Investments

• FY 2005: Income impact of $150 million

• FY 2006 guidance: income impact similar to 2005

Income Statement Cash Flow

10

11

Hidden Value through Equity Affiliates

Cash and Proportional EBITDA of Equity Affiliatesin $ millions

Net Earnings Equity Affiliates

Not included inOperating EBITDA

Total proportional EBITDA from Equity Affiliates

Total proportional EBITDA not properly reflected

0

20

40

60

80

100

120

140

160

2003 2004 2005 2006 2007

Proportional EBITDA above Earnings (Hidden Value)

Included inOperating EBITDA

11

12

Capitalization(in $millions) Dec 31,

2005Mar 31,

2006

354

1,718--

1,718800165412

3,09577

322

3,494

418

3,912

3,140

June 30, 2006

312

1,712--

1,712800157460

3,12975

314

3,518

308

3,826

3,206

Cash

Senior Credit Term LoanSenior Credit RevolverFloating Rate Term Loan

Total Senior DebtSenior Sub Notes ($)Senior Sub Notes (€*)Other Debt

Total Cash Pay DebtDiscount Notes Series ADiscount Notes Series B

Total Debt

Shareholders' Equity

Total Capitalization

Net Debt(Total Debt Less Cash)

390

1,708--

1,708800153397

3,05873

306

3,437

235

3,672

3,047

* Translated at 1.2713 - effective date June 30, 2006

13

2006 Business Outlook

Chemical Products

Favorable industry dynamics

Continued strong global demand

Ticona

Increasing penetration in key customer segments

Improved global demand

Positive impact of COC sale

Acetate Products

Improving earnings with progress on restructuring

On path to improved profitability levels

Performance Products

Strong performance on demand growth

Moving toward specialty-chemical performance seasonally stronger 1st half

13

2006 Adjusted EPS Guidance

$2.50 to $2.80

• Strong performance from operations

• Acid expansions to be absorbed throughout the year

14

2006 Guidance

Adjusted EPS: $2.50 to $2.80Depreciation/Amortization• $275 - $300 millionCash Interest Expense• $230 - $250 millionTax Rate• 28%Capital Expenditures• $200 - $250 millionCE Equity• 158.6 million shares common stock outstanding• 1.5 million stock option grants*• 12 million shares convertible preferred

* Based on total of 11 million stock option grants valued using the Treasury Method as of June 30, 2006.

14

15

Appendix

15

16

Reg G: Reconciliation of Diluted Adjusted EPS

Table 6

Adjusted Earnings Per Share - Reconciliation of a Non-U.S. GAAP Measure

(in $ millions, except per share data) 2006 2005 2006 2005Earnings from continuing operations before tax and minority interests 146 123 307 136 Non-GAAP Adjustments: Special charges and other adjustments * 25 13 35 61 Refinancing costs - - - 102 Adjusted earnings from continuing operations before tax and minority interests 171 136 342 299 Income tax provision on adjusted earnings ** (48) (33) (96) (74)Minority interests (1) (13) (1) (38)Earnings from discontinued operations, net of tax - - 1 10 Preferred dividends (2) (2) (5) (4)Adjusted net earnings available to common shareholders 120 88 241 193Add back: Preferred dividends 2 2 5 4Adjusted net earnings for diluted adjusted EPS 122 90 246 197

Diluted shares (millions)Weighted average shares outstanding 158.6 158.5 158.6 150.2Assumed conversion of Preferred Shares 12.0 12.0 12.0 12.0 Assumed conversion of stock options 1.5 - 1.4 0.1 Total diluted shares 172.1 170.5 172.0 162.3Adjusted EPS from continuing operations 0.71 0.53 1.42 1.15

Earnings per common share from discontinued operations - - 0.01 0.06Adjusted EPS 0.71 0.53 1.43 1.21

* See Table 7 for details

** The U.S. GAAP tax rate for the three and six months ended June 30, 2006 is 29%. The company is using the 28% rate reflective of the original

guidance in Q1 2006.

Six Months EndedJune 30,

Three Months EndedJune 30,

17

Reg G: Reconciliation of Net Debt

Table 5

Net Debt - Reconcilation of a Non-U.S. GAAP MeasureJune 30, December 31,

(in $ millions) 2006 2005 Short-term borrowings and current installments of long-term debt - third party and affiliates 174 155Plus: Long-term debt 3,320 3,282Total debt 3,494 3,437Less: Cash and cash equivalents 354 390Net Debt 3,140 3,047

18

Reg G: Reconciliation of Special Charges

Table 7

Reconciliation of Special Charges to Total Special Charges and Other Adjustments

Special Charges:

(in $ millions) 2006 2005 2006 2005Employee termination benefits 9 6 11 8 Plant/office closures 2 1 - 2 Total restructuring 11 7 11 10 Asset impairments - 24 - 24 Insurance recoveries associated with plumbing cases (2) (4) (3) (4)Other 3 - 4 35 * Total 12 27 12 65

Other Adjustments: **

(in $ millions) 2006 2005 2006 2005Executive severance & legal costs related to Squeeze-Out 13 - 23 - Favorable impact on non-operating foreign exchange position - (14) - (14)Advisor monitoring fee - - - 10 Total 13 (14) 23 (4)

Total special charges and other adjustments 25 13 35 61 * Termination of advisor monitoring fee** These items are included in net earnings (loss) but not included in special charges.

June 30, June 30,

Three Months Ended Six Months Ended

Three Months Ended Six Months Ended

June 30, June 30,

19

Reg G: Reconciliation of Operating EBITDA T

abl

e 1

Seg

men

t Dat

a a

nd R

eco

nci

liatio

n of

Ope

ratin

g P

rofi

t (Lo

ss) t

o O

per

atin

g E

BIT

DA

-

a N

on-

U.S

. GA

AP

Mea

sure

. *

(in $

mill

ions

) 20

0620

0520

0620

05N

et S

ale

s C

hem

ical

Pro

duct

s1,

194

1,08

52,

363

2,12

9 T

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ical

Pol

ymer

s Ti

cona

230

223

461

462

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Pro

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617

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333

7 P

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rman

ce P

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cts

4847

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ities

688

129

20 I

nter

segm

ent e

limin

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ns(4

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tal

1,67

41,

506

3,32

62,

984

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ng P

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t (L

oss

) C

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Pro

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530

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Pol

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(61)

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8

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Ch

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***

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74

Tec

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(4)

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n E

xpen

se C

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ical

Pro

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s41

3979

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echn

ical

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ymer

s Ti

cona

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tate

Pro

duct

s5

912

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rman

ce P

rodu

cts

43

86

Oth

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7

2

1

2

4

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l73

6714

313

0

Ope

rati

ng E

BIT

DA

Che

mic

al P

rodu

cts

206

191

414

417

Tec

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al P

olym

ers

Tico

na67

5513

612

2 A

ceta

te P

rodu

cts

5521

8541

Per

form

ance

Pro

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s21

1842

34 O

ther

Act

iviti

es(4

1)(2

3)(6

5)(6

7)To

tal

308

262

612

547

* O

ther

Act

iviti

es p

rimar

ily in

clud

es c

orp

ora

te s

ellin

g, g

ener

al a

nd a

dmin

istr

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e ex

pens

es

and

the

resu

lts fr

om

AT

Pla

stic

s an

d ca

ptiv

e in

sura

nce

com

pani

es.

** I

nclu

des

equi

ty e

arni

ngs

fro

m a

ffili

ates

and

oth

er in

com

e/(e

xpen

se),

whi

ch is

prim

arily

div

iden

ds

fro

m c

ost

inve

stm

ents

.

***

Exc

lude

s ad

just

men

ts to

min

orit

y in

tere

st, n

et in

tere

st, t

axes

, dep

reci

atio

n an

d am

ort

izat

ion.

Thre

e M

onth

s En

ded

June

30,

Six

Mon

ths

Ende

dJu

ne 3

0,

20

2005 Operating EBITDA by Segment

20

in $ millions 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr

191 198

50

17

17

(32)

250

55

197

32

28

13

(13)

21

18

(24)

261 257

Full Year

Chemical Products 226 812

Technical Polymers Ticona

67 204

Acetate Products 20 86

Performance Products

16 64

Other Activities (44) (113)

Total 285 1,053

21

Reg G: Reconciliation of 2005 Operating EBITDA

Q1

2006

Q1

2005

Q2

2005

Q3

2005

Q4

2005

FY 2

005

Net S

ales

Che

mic

al P

rodu

cts

1,04

41,

085

1,10

01,

107

4,33

6 T

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cona

239

223

212

213

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216

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065

9 P

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rman

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cts

4747

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180

Oth

er A

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ities

128

5569

144

Int

erse

gmen

t elim

inat

ions

(29)

(29)

(40)

(38)

(136

)16

521,

478

1,50

61,

535

1,55

16,

070

Ope

ratin

g Pr

ofit

(Los

s) C

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Pro

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143

573

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ial C

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819

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Pro

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s16

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ities

(44)

(24)

(32)

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(113

)30

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125

025

71,

053