QuickLinks -- Click here to rapidly navigate through this document

Exhibit 99.1

NEWS
Release

GRAPHIC

FOR IMMEDIATE RELEASE
February 10, 2004
  Media Contact:
Don Olsen
(713) 235-6000
  Finance Contact:
Kimo Esplin
(801) 584-5700


HMP EQUITY HOLDINGS RESTATES THIRD QUARTER RESULTS

        Houston, TX—HMP Equity Holdings Corporation ("HMP") today reported that it will restate its third quarter 2003 financial statements and those of its subsidiaries, Huntsman International Holdings LLC ("HIH"), Huntsman International LLC ("Huntsman International") and Huntsman LLC. The restatements are required primarily to correct an accounting error at Huntsman International which resulted from the implementation of and transition to a new SAP-based enterprise resource planning ("ERP") system for Huntsman International's propylene oxide product line earlier in the year and also to adjust certain other items which, if considered in relation to the financial statements taken as a whole, are not material.

        In February 2004, Huntsman International discovered an error in how it had accounted for product exchange balances under a toll processing agreement with a customer. The error was caused by the use of an incorrect exchange factor in Huntsman International's new SAP-based ERP system for its propylene oxide product line.

        The effect of the restatement on the results of operations of HMP is to reduce third quarter 2003 reported EBITDA by $12.7 million, to $157.3 million from $170.0 million, and to increase net loss by $12.3 million, to $98.0 million from $85.7 million. The effect of the restatement on the results of operations of HIH is to reduce third quarter 2003 reported EBITDA by $12.7 million, to $91.5 million from $104.2 million, and to increase net loss by $12.3 million to $58.9 million from $46.6 million. The effect the restatement on the results of operations of HI is to reduce third quarter 2003 reported EBITDA by $12.7 million, to $91.5 million from $104.2 million, and to increase net loss by $12.3 million, to $32.3 million from $20.0 million. The effect of the restatement on the results of operations of Huntsman LLC is to reduce third quarter 2003 reported EBITDA by $7.8 million, to $164.7 million from $172.5 million, and to increase net loss by $7.4 million, to $60.6 million from $53.2 million.

        The following table reconciles EBITDA to net income (loss) for the companies impacted by the restatement of third quarter 2003 reported earnings:

 
  HMP
  HIH
  Huntsman International
  Huntsman LLC
 
 
  As
Restated

  As
Reported

  As
Restated

  As
Reported

  As
Restated

  As
Reported

  As
Restated

  As
Reported

 
 
  (In Millions)

 
Net income (loss)   $ (98.0 ) $ (85.7 ) $ (58.9 ) $ (46.6 ) $ (32.3 ) $ (20.0 ) $ (60.6 ) $ (53.2 )
Interest expense, net     138.9     139.3     88.0     88.4     61.4     61.8     122.7     123.1  
Income tax (benefit) expense     2.2     2.2     (5.3 )   (5.3 )   (5.3 )   (5.3 )   2.1     2.1  
Depreciation and amortization     114.2     114.2     67.7     67.7     67.7     67.7     100.5     100.5  
   
 
 
 
 
 
 
 
 
EBITDA(1)   $ 157.3   $ 170.0   $ 91.5   $ 104.2   $ 91.5   $ 104.2   $ 164.7   $ 172.5  
   
 
 
 
 
 
 
 
 

(1)
EBITDA is defined as earnings from continuing operations before interest, taxes, depreciation and amortization. EBITDA is included in this report because it is a basis on which we assess our financial performance and debt service capabilities, and because certain covenants in our borrowing arrangements are tied to similar measures. However, EBITDA should not be considered in isolation or viewed as a substitute for cash flow from operations, net income or other measures of performance as defined by accounting principles generally accepted in the United States or as a measure of a company's profitability or liquidity. We understand that while EBITDA is frequently used by security analysts, lenders and others in their evaluation of companies, EBITDA as used herein is not necessarily comparable to other similarly titled captions of other companies due to potential inconsistencies in the method of calculation.

        Included in EBITDA are the following items of income (expense):

 
  HMP
  HIH
  Huntsman International
  Huntsman LLC
 
 
  As
Restated

  As
Reported

  As
Restated

  As
Reported

  As
Restated

  As
Reported

  As
Restated

  As
Reported

 
 
  (In Millions)

 
Foreign exchange gains—unallocated   $ 10.1   $ 10.1   $ 8.7   $ 8.7   $ 8.7   $ 8.7   $ 10.1   $ 10.1  
Asset write-down     (3.0 )       (3.0 )       (3.0 )       (3.0 )    
Loss on sale of accounts receivable     (5.9 )   (5.9 )   (5.9 )   (5.9 )   (5.9 )   (5.9 )   (5.9 )   (5.9 )
Contract termination costs—net     (0.9 )   (0.9 )                        
Purchase accounting adj.—inventory valuation     (1.0 )   (1.0 )                        
Restructuring expenses   $ (4.8 ) $ (4.8 ) $ (4.8 ) $ (4.8 ) $ (4.8 ) $ (4.8 ) $ (4.8 ) $ (4.8 )

Huntsman Companies—Abbreviated Organization Chart

CHART

        In connection with the restatements, HIH and Huntsman International have filed amendments to their third quarter results on Form 10-Q/A with the U.S. Securities and Exchange Commission (the "SEC"). HMP and Huntsman LLC have circulated to investors revised quarterly reports for the third quarter. All such reports are available on the Company's website at www.huntsman.com. Additionally, Huntsman LLC intends to file an amendment to its registration statement on Form S-4, which had been previously filed but which has not yet been declared effective by the SEC, to reflect the restatement as soon as possible.

        We do not expect this restatement to affect the timing of the release of our full year and fourth quarter 2003 results, which are expected to be released in mid-March.

**********

2


        Questions regarding the above information should be directed to the following:

Kimo Esplin
Executive Vice President & CFO
Tel: 801-584-5861
Email:
kimo  esplin@huntsman.com
  Curt Dowd
Vice President, Finance
Tel: 801-584-5826
Email:
curt  dowd@huntsman.com

Sean Douglas
Vice President and Treasurer
Tel: 801-584-5743
Email:
sean  douglas@huntsman.com

 

John Heskett
Vice President, Corporate Development
Tel: 801-584-5768
Email:
john  heskett@huntsman.com

3




QuickLinks

HMP EQUITY HOLDINGS RESTATES THIRD QUARTER RESULTS