<PAGE>
 
                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM 10-Q

              [X] Quarterly Report Pursuant to Section 13 or 15(d)
     of the Securities Exchange Act of 1934 for the quarterly period ended
                                 June 26, 1998

    [  ] Transition Report Pursuant to Section 13 or 15(d) of the Securities
                          Exchange Act of 1934 for the
                       transition period from _______ to

                       Commission file number: 333-19495

                          RADNOR HOLDINGS CORPORATION
             (Exact name of registrant as specified in its charter)

           Delaware                                             23-2674715
(State or other jurisdiction of                             (I.R.S. Employer
incorporation or organization)                            Identification Number)
 
 Three Radnor Corporate Center, Suite 300
100 Matsonford Road, Radnor, Pennsylvania                    19087
(address of principal executive offices)                   (Zip Code)
 
                 Registrant's telephone number, including area
                              code: 610-341-9600


     Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.

Yes [ X ]  No [   ]


    The number of shares outstanding of the Registrant's common stock as of
                                August 5, 1998:


                                                                 Number
              Class                                            of Shares
---------------------------------                             -----------
Voting Common Stock; $.10 par value                               600
Nonvoting Common Stock; $.10 par value                            245
Class B Nonvoting Common Stock; $.01 par value                  5,400
<PAGE>
                        PART I - FINANCIAL INFORMATION

Item 1.  FINANCIAL STATEMENTS

                 RADNOR HOLDINGS CORPORATION AND SUBSIDIARIES
                     CONDENSED CONSOLIDATED BALANCE SHEETS
                     (In thousands, except share amounts)

<TABLE>
<CAPTION>
                                                                                      June 26,                 December 26,
                                                                                        1998                        1997
                                                                                   --------------              --------------
                                                                                     (Unaudited)
<S>                                                                                <C>                         <C>
    ASSETS                                                                         
CURRENT ASSETS                                                                     
              Cash                                                                  $       4,970              $        8,810   
              Accounts receivable, net                                                     35,383                      28,589
              Inventories, net                                                             33,111                      28,451
              Prepaid expenses and other                                                    4,476                       3,520
              Deferred income taxes                                                         1,705                       1,708
                                                                                   --------------              --------------
                                                                                   
                            Total current assets                                           79,645                      71,078  
                                                                                   --------------              --------------
                                                                                   
PROPERTY, PLANT AND EQUIPMENT                                                             186,238                     176,981
LESS - ACCUMULATED DEPRECIATION                                                           (16,782)                    (11,868)
                                                                                   --------------              --------------
NET PROPERTY, PLANT AND EQUIPMENT                                                         169,456                     165,113
                                                                                   --------------              --------------
OTHER ASSETS                                                                               14,242                      13,627
                                                                                   --------------              --------------
                            Total assets                                            $     263,343              $      249,818
                                                                                    =============              ==============
                                                                                   
LIABILITIES AND STOCKHOLDERS' EQUITY                                               
CURRENT LIABILITIES                                                                
              Accounts payable                                                      $      26,829              $       28,565
              Accrued liabilities                                                          19,986                      18,151
              Current portion of long-term debt and capitalized                    
                            lease obligations                                                 853                         226
                                                                                   --------------              --------------
                                                                                   
                            Total current liabilities                                      47,668                      46,942
                                                                                   --------------              --------------
                                                                                   
LONG-TERM DEBT, net of current portion                                                    183,555                     178,947
                                                                                   --------------              --------------
CAPITALIZED LEASE OBLIGATIONS, net of current portion                                       4,216                          -
                                                                                   --------------              --------------
DEFERRED INCOME TAXES                                                                      10,296                       8,543
                                                                                   --------------              --------------
OTHER NONCURRENT LIABILITIES                                                                  411                         411
                                                                                   --------------              --------------
                                                                                   
COMMITMENTS AND CONTINGENCIES                                                      
STOCKHOLDERS' EQUITY                                                               
              Voting and nonvoting common stock, 22,700 shares authorized,         
                            6,245 shares issued and outstanding                                 1                           1
              Additional paid-in capital                                                   19,387                      19,387
              Retained earnings (deficit)                                                     788                      (2,809)
              Cumulative translation adjustment                                            (2,979)                     (1,604)
                                                                                   --------------              --------------
                                                                                   
                            Total stockholders' equity                                     17,197                      14,975
                                                                                   --------------              --------------
                                                                                   
                            Total liabilities and stockholders' equity              $     263,343               $     249,818
                                                                                    =============               =============

The accompanying notes are an integral part of these condensed consolidated financial statements.

</TABLE>

                                       2



<PAGE>


<TABLE> 
<CAPTION> 

                 RADNOR HOLDINGS CORPORATION AND SUBSIDIARIES
                  CONDENSED CONSOLIDATED STATEMENTS OF INCOME
                                  (Unaudited)
                                (In thousands)
 

                                                For the three months ended      For the six months ended
                                                --------------------------      ------------------------
                                                June 26,          June 27,      June 26,        June 27,
                                                  1998              1997          1998            1997 
                                                --------          --------      --------        --------
<S>                                             <C>               <C>           <C>             <C> 
Net sales                                       $ 84,063          $ 60,427      $155,877        $114,455
Costs of goods sold                               58,907            44,777       111,692          85,431
                                                --------          --------      --------        --------
                                       
         Gross profit                             25,156            15,650        44,185          29,024

Operating expenses:
     Distribution                                  6,033             4,557        11,206           8,545
     Selling, general and administrative           9,734             5,951        18,260          11,440
                                                --------          --------      --------        --------
        
         Income from operations                    9,389             5,142        14,719           9,039

Other (income) expense:
     Interest, net                                 4,613             2,964         9,172           5,788
     Other, net                                       35               (71)         (246)           (138)
                                                --------          --------      --------        --------

Income before income taxes                         4,741             2,249         5,793           3,389

Provision for income taxes
     Current                                         357               131           435             206
     Deferred                                      1,439               113         1,761             113
                                                --------          --------      --------        --------
                                                   1,796               244         2,196             319
                                                --------          --------      --------        --------
Net income                                      $  2,945          $  2,005      $  3,597        $  3,070
                                                ========          ========      ========        ========

               The accompanying notes are an integral part of these condensed consolidated financial statements.   
</TABLE> 
 
                                       3
<PAGE>

                 RADNOR HOLDINGS CORPORATION AND SUBSIDIARIES
                CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                  (Unaudited)
                                (In thousands)

<TABLE>
<CAPTION>
                                                                                          For the six months ended
                                                                                   -------------------------------------------
                                                                                      June 26,                    June 27,
                                                                                        1998                        1997
                                                                                   --------------              --------------
<S>                                                                                <C>                         <C>
CASH FLOWS FROM OPERATING ACTIVITIES
  Net income                                                                        $       3,597              $        3,070   
  Adjustments to reconcile net income to cash provided by                                                                    
    (used in) operating activities-                                                                                          
        Depreciation                                                                        4,933                       3,262
        Amortization                                                                        1,021                         867
        Deferred income taxes                                                               1,761                         113  
        Changes in operating assets and liabilities, net of
          acquisition of business-
            Accounts receivable, net                                                       (7,209)                      2,192   
            Inventories                                                                    (5,177)                     (3,488)
            Prepaid expenses and other                                                       (996)                        607 
            Accounts payable                                                               (1,393)                     (4,244)
            Accrued liabilities                                                             2,834                      (1,556)
                                                                                   --------------              --------------
                Net cash provided by (used in) operating activities                          (629)                       823
                                                                                   --------------              --------------

CASH FLOWS FROM INVESTING ACTIVITIES
  Capital expenditures                                                                     (8,435)                     (6,981)
  Acquisition of Epsilevy Oy, net of cash acquired                                         (1,049)                        --
  Additional acquisition costs for StyroChem Europe                                          (345)                        --      
  Increase in other assets                                                                 (1,782)                     (1,294)
                                                                                   --------------              --------------
                Net cash used in investing activities                                     (11,611)                     (8,275)
                                                                                   --------------              --------------

CASH FLOWS FROM FINANCING ACTIVITIES
  Net borrowings on bank financed debt and 
    unsecured notes payable                                                                 4,710                      10,946
  Net borrowings on capital lease obligations                                               4,871                         --
  Cash dividends                                                                              --                       (3,000)
                                                                                   --------------              --------------
        Net cash provided by financing activities                                           9,581                       7,946
                                                                                   --------------              --------------
EFFECTS OF EXCHANGE RATE CHANGES ON CASH                                                   (1,181)                        --
                                                                                   --------------              --------------
NET (DECREASE) INCREASE IN CASH                                                            (3,840)                        494
        
CASH, beginning of period                                                                   8,810                         855      
                                                                                   --------------              --------------
CASH, end of period                                                                $        4,970              $        1,349 
                                                                                   ==============              ==============
SUPPLEMENTAL CASH FLOW DISCLOSURES
  Interest Paid                                                                    $        8,649              $        5,272
                                                                                   ==============              ==============

  Income Taxes Paid                                                                $          --               $          515 
                                                                                   ==============              ==============

                 The accompanying notes are an integral part of these condensed consolidated financial statements.

</TABLE>









 
                                       4
<PAGE>
 
                  RADNOR HOLDINGS CORPORATION AND SUBSIDIARIES
              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                                  (Unaudited)


(1)  BASIS OF PRESENTATION

  The condensed consolidated financial statements included herein have been
  prepared by Radnor Holdings Corporation and subsidiaries (collectively,
  "Radnor" or the "Company") pursuant to the rules and regulations of the
  Securities and Exchange Commission.  Certain information and footnote
  disclosures normally included in consolidated financial statements prepared in
  accordance with generally accepted accounting principles have been condensed
  or omitted pursuant to such rules and regulations.  In the opinion of the
  Company, the statements include all adjustments (which include only normal
  recurring adjustments) required for a fair statement of financial position,
  results of operations and cash flows for such periods.  The results of
  operations for the interim periods are not necessarily indicative of the
  results for a full year.

 (2)   INVENTORIES

  The components of inventories were as follows (in thousands):
 
                      June 26,     December 26,
                        1998          1997
                      -------       -------
  Raw Materials       $10,927       $ 9,612
  Work in Process       1,525         1,303
  Finished Goods       20,659        17,536
                      -------       -------
                      $33,111       $28,451
                      =======       =======
 

(3) INTEREST EXPENSE

  Included in interest expense is $266,000 and $136,000 of amortization of
  deferred financing costs for the three months ended June 26, 1998 and June 27,
  1997, respectively, and $543,000 and  $276,000 of amortization of deferred
  financing costs for the six months ended June 26, 1998 and June 27, 1997,
  respectively.  Premium amortization of $76,000 and $146,000 related to the
  issuance of the Company's 10% Series B Senior Notes due 2003 is included in
  interest expense for the three months ended June 26, 1998 and six months ended
  June 26, 1998, respectively.


                                       5
<PAGE>
 
(4) COMPREHENSIVE INCOME

  In 1998, the Company adopted Statement of Financial Accounting Standard No.
  130, Reporting Comprehensive Income, which establishes standards for the
  reporting and display of comprehensive income and its components.
  Comprehensive income is the total of net income and non-owner changes in
  equity.  The Company had comprehensive income as follows:

<TABLE>
<CAPTION>
                                              Three Months Ended   Six Months Ended
                                               -----------------  -------------------
                                               June 26,  June 27,  June 26,   June 27,
                                                1998      1997      1998       1997
                                               ------    ------   -------     ------ 
<S>                                            <C>       <C>      <C>         <C> 
  Net Income                                   $2,945    $2,005   $ 3,597     $3,070
  Foreign Currency Translation Adjustment          98         7    (1,375)       (21)
                                               ------    ------   -------     ------
            Comprehensive Income               $3,043    $2,012   $ 2,222     $3,049
                                               ======    ======   =======     ======
</TABLE>

(5)  SUPPLEMENTAL FINANCIAL INFORMATION

  Radnor Holdings Corporation is a holding company which has no operations
  separate from its investment in subsidiaries.  The Company's $100 million 10%
  Senior Notes due 2003 and $60 million 10% Series B Senior Notes due 2003 are
  guaranteed by substantially all of the Company's domestic subsidiaries.  The
  following represents summarized combining financial information of the holding
  company, combined guarantor subsidiaries and the combined non-guarantor
  subsidiaries as of and for the three months and six months ended June 26, 1998
  (in thousands):


<TABLE>
<CAPTION>

                                 Holding       Guarantor   Non-Guarantor         
                                 Company     Subsidiaries  Subsidiaries  Eliminations  Consolidated
                              ------------   ------------  ------------  ------------  ------------

                       THREE MONTHS ENDED JUNE 26, 1998
                       --------------------------------
 <S>                           <C>            <C>           <C>          <C>          <C>
  Net Sales                   $    -         $  56,373     $  31,408     $  (3,718)    $  84,063
  Gross Profit                     -            15,789         9,367             -        25,156
  Income from Operations           -             5,220         4,169             -         9,389
  Net Income                       -             1,595         2,575        (1,225)        2,945

                         SIX MONTHS ENDED JUNE 26, 1998
                         ------------------------------

  Net Sales                   $   -          $ 105,805     $  54,462     $  (4,390)    $ 155,877
  Gross Profit                    -             28,593        15,592             -        44,185
  Income from Operations          -              8,740         5,979             -        14,719
  Net Income                      -              2,676         3,352        (2,431)        3,597

                                 JUNE 26, 1998
                                 -------------
 
  Current Assets              $    389       $  51,451     $  35,228     $  (7,423)    $  79,645
  Non-Current Assets           146,738         180,838        49,175      (193,053)      183,698
  Current Liabilities            1,132          31,047        16,363          (874)       47,668
  Non-Current Liabilities      162,014          84,671        60,315      (108,522)      198,478
</TABLE> 


                                       6
<PAGE>
 
ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
       OF OPERATIONS

GENERAL

  Radnor manufactures and distributes worldwide a variety of specialty chemical
  and foam products for the foodservice, insulation and protective packaging
  industries.  In the foodservice industry, the Company is the second largest
  manufacturer of foam cup and container products, with an estimated 35% share
  of the U.S. foam cup and container market segment.  The Company is also the
  fifth largest producer worldwide of expandable polystyrene.  The Company
  manufactures, markets and sells its products through five operating units
  comprised of twenty-three manufacturing locations in the U.S., Canada and
  Europe.

COMPARABILITY OF PERIODS

  Financial results for the periods presented are not fully comparable because
  of the October 1997 acquisition of the polystyrene production and conversion
  operations of Neste Oy ("StyroChem Europe").

THREE MONTHS ENDED JUNE 26, 1998 COMPARED TO THREE MONTHS ENDED JUNE 27, 1997
 
  Net sales increased to $84.1 million for the three months ended June 26, 1998
  from $60.4 million for the same period in 1997, an increase of $23.7 million
  or 39.2%.  The increase was due to the acquisition of StyroChem Europe on
  October 15, 1997.

  Cost of goods sold as a percentage of net sales decreased to 70.1% for the
  three months ended June 26, 1998, from 74.1% for the same period in 1997.
  This decrease was primarily due to a decline in raw material prices, higher
  levels of production and improved manufacturing efficiencies.

  Gross profit increased to $25.2 million or 29.9% of net sales for the three
  months ended June 26, 1998, from $15.7 million or 25.9% of net sales for the
  same period in 1997.

  Distribution expense as a percentage of net sales decreased to 7.1% for the
  three months ended June 26, 1998, from 7.6% of net sales for the same period
  in 1997.  This decrease was primarily due to increased efficiencies in the
  North American operations resulting from the realignment of shipping points
  and an increase in the percentage of full truckload shipments.

  Selling, general and administrative expenses as a percentage of net sales
  increased to 11.6% for the three months ended June 26, 1998, from 9.8% of net
  sales for the same period in 1997.  This increase was due to higher selling
  and marketing expenses as well as additional administrative costs associated
  with StyroChem Europe.

  Income from operations increased to $9.4 million or 11.2% of net sales for the
  three months ended June 26, 1998, from $5.1 million or 8.5% of net sales for
  the same period in 1997.

  Interest increased to $4.6 million for the three months ended June 26, 1998,
  from $3.0 million for the same period in 1997.  This increase was primarily
  due to an increase in borrowings related to the acquisition of StyroChem
  Europe in October 1997.

  Income taxes were $1.8 million for the three months ended June 28, 1998,
  compared to $0.2 million for the same period in 1997.  This increase relates
  to the elimination, in the prior year, of an income tax valuation allowance
  that was recorded against the Company's loss carryforward tax benefits.


                                       7
<PAGE>
 
  Net income increased to $2.9 million or 3.5% of net sales for the three months
  ended June 26, 1998, from $2.0 million or 3.3% of net sales for the same
  period in 1997 due to the reasons described above.

SIX MONTHS ENDED JUNE 26, 1998 COMPARED TO SIX MONTHS ENDED JUNE 27, 1997
 
  Net sales increased to $155.9 million for the six months ended June 26, 1998
  from $114.5 million for the same period in 1997, an increase of $41.4 million
  or 36.2%. The increase was due to the acquisition of StyroChem Europe on
  October 15, 1997.

  Cost of goods sold as a percentage of net sales decreased to 71.7% for the six
  months ended June 26, 1998, from 74.6% for the same period in 1997. This
  decrease was primarily due to a decline in raw material prices, higher levels
  of production and improved manufacturing efficiencies.

  Gross profit increased to $44.2 million or 28.3% of net sales for the six
  months ended June 26, 1998, from $29.0 million or 25.4% of net sales for the
  same period in 1997.

  Distribution expense as a percentage of net sales decreased to 7.2% for the
  six months ended June 26, 1998, from 7.5% of net sales for the same period in
  1997.  This decrease was primarily due to increased efficiencies in the North
  American operations resulting from the realignment of shipping points and an
  increase in the percentage of full truckload shipments.

  Selling, general and administrative expenses as a percentage of net sales
  increased to 11.7% for the six months ended June 26, 1998, from 10.0% of net
  sales for the same period in 1997.  This increase was due to higher selling
  and marketing expenses as well as additional administrative costs associated
  with StyroChem Europe.

  Income from operations increased to $14.7 million or 9.4% of net sales for the
  six months ended June 26, 1998, from $9.0 million or 7.9% of net sales for the
  same period in 1997.

  Interest increased to $9.2 million for the six months ended June 26, 1998,
  from $5.8 million for the same period in 1997.  This increase was primarily
  due to an increase in borrowings related to the acquisition of StyroChem
  Europe in October 1997.

  Income taxes were $2.2 million for the six months ended June 28, 1998,
  compared to $0.3 million for the same period in 1997.  This increase relates
  to the elimination, in the prior year, of an income tax valuation allowance
  that was recorded against the Company's loss carryforward tax benefits.

  Net income increased to $3.6 million or 2.3% of net sales for the six months
  ended June 26, 1998, from $3.1 million or 2.7% of net sales for the same
  period in 1997 due to the reasons described above.


LIQUIDITY AND CAPITAL RESOURCES

  During the six months ended June 26, 1998 and June 27, 1997, the Company's
  principal source of funds consisted of cash from financing sources. During the
  1998 period, after tax cash flow of $11.3 million, borrowings under the
  Company's credit facilities of $4.7 million, capital lease financing of $4.9
  million and a decrease in cash of $3.8 million were primarily used to fund
  capital expenditures of $8.4 million and a $11.9 million increase in working
  capital.


                                       8
<PAGE>
 
  As of June 26, 1998, the Company had $21.3 million outstanding and $15.1
  million of availability under its revolving credit agreements.  The Company's
  principal uses of cash for the next several years will be working capital
  requirements and capital expenditures.

  As a holding company, Radnor Holdings Corporation is dependent upon dividends
  and other payments from its subsidiaries to generate the funds necessary to
  meet its obligations.  Subject to certain limitations under applicable state
  law and the Company's credit agreements, Radnor Holdings Corporation is, and
  will continue to be, able to control its receipt of dividends and other
  payments from its subsidiaries. Management believes that cash generated from
  operations, together with available borrowings under the revolving credit
  facilities, will be sufficient to meet the Company's expected operating needs,
  planned capital expenditures and debt service requirements.

YEAR 2000 COMPLIANCE

    The Company is currently in the process of evaluating its information
  technology infrastructure for Year 2000 compliance.  The Company does not
  expect that the cost to modify its information technology infrastructure to be
  Year 2000 compliant will be material to its financial condition or results of
  operations.  The Company does not anticipate any material disruptions in its
  operations as a result of any failure by the Company to be in compliance.  The
  Company does not currently have any information concerning the Year 2000
  compliance status of its suppliers and customers and there can be no assurance
  that such suppliers and customers are or will be Year 2000 compliant.  In the
  event that any of the Company's significant suppliers or customers does not
  successfully and timely achieve Year 2000 compliance, the Company's business
  operations could be adversely affected.

Forward Looking Statements

  All statements contained herein that are not historical facts are based on
  current expectations.  These statements are forward looking in nature and
  involve a number of risks and uncertainties.  Such risks and uncertainties are
  described in detail in the Company's Report on Form 10-K for the year ended
  December 26, 1997, Commission File No. 333-19495, to which reference is hereby
  made.


                                       9
<PAGE>
 
                           PART II  OTHER INFORMATION

Item 1.  LEGAL PROCEEDINGS

       On November 25, 1996, Jackson National Life Insurance Company ("Jackson")
       and Benchmark Holdings, Inc. ("Holdings") filed suit in Cook County,
       Illinois Circuit Court against Michael T. Kennedy, Radnor Holdings
       Corporation ("Radnor"), WinCup Holdings, Inc. ("WinCup"), WinCup Holdings
       L.P. ("WinCup L.P."), James River Paper Company, Inc. ("James River") and
       James River Corporation of Virginia.  The suit related to the November
       1995 sale to James River by Holdings of substantially all of Holdings'
       assets, consisting of its cutlery and straws operations, and by WinCup of
       its plastic cup operations.  See Note 1 to the Company's Consolidated
       Financial Statements contained in the Company's Report on Form 10-K for
       the year ended December 26, 1997, Commission File No. 333-19495.
       Holdings had issued to Jackson certain shares of nonvoting preferred
       stock in connection with the May 1991 acquisition of the cutlery and
       straws operations, in which Jackson previously held an unsecured
       subordinated position.  On February 27, 1998, the court dismissed the
       suit on the basis of forum non conveniens.

       On June 24, 1998, Jackson and Holdings filed an action against the same
       defendants asserting similar claims relating to the November 1995 sale in
       the Court of Chancery for the State of Delaware in and for New Castle
       County. The suit alleges, among other things, that, in connection with
       the November 1995 sale to James River, Radnor and certain defendants (i)
       breached or participated in breaching certain fiduciary duties to Jackson
       and Holdings, (ii) improperly interfered in certain alleged contractual
       rights of the nonvoting preferred shareholders to prevent the sale from
       occurring, (iii) committed fraud against Jackson and Holdings in
       structuring the transaction and in failing to disclose the transaction to
       Jackson in a timely manner and (iv) usurped Holdings' corporate
       opportunity in connection with the 1992 acquisition of WinCup. The suit
       seeks a broad range of remedies including the imposition of a
       constructive trust, payment to Holdings of the profits received by James
       River and WinCup L.P. since the sale and WinCup L.P's formation and
       damages of not less than $30.0 million.

       The Company believes that the allegations in the complaint are without
       merit.  Holdings, through its investment banker, actively solicited a
       large number of prospective purchasers regarding the sale of the cutlery
       and straws operations.  The Company believes that Jackson had no right to
       prevent the sale of Holdings' assets.  In connection with the sale,
       Holdings obtained opinions from independent investment banking firms as
       to the fairness, from a financial point of view, of the transaction to
       Holdings' stockholders and as to the reasonableness of the negotiated
       value of the noncompetition agreements.  The proceeds received by
       Holdings from the sale of the cutlery and straws operations, together
       with all the remaining assets of Holdings, were significantly less than
       the aggregate outstanding indebtedness of Holdings.  As a result, no
       proceeds were available for distribution to any of  Holdings'
       stockholders, including Jackson.  Although it is not possible to predict
       with certainty the outcome of any legal proceeding, the Company intends
       to defend this suit vigorously and does not believe that the suit will
       have a material adverse effect on the Company's financial condition or
       results of operations.


       The Company is involved in various legal actions arising in the normal
       course of business.  After taking into consideration legal counsel's
       evaluation of such actions, management believes that these actions will
       not have a material effect on the Company's financial position or results
       of operations.


                                      10
<PAGE>
 
ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

(a)  Exhibits

           4.1  Fourth Supplemental Indenture, dated as of July 16, 1998 among
              Radnor Holdings Corporation, WinCup Holdings, Inc., Radnor
              Chemical Corporation, StyroChem U.S., Inc., Radnor Management,
              Inc., Radnor Delaware, Inc. and First Union National Bank

          10.1  Amendment No. 1 to Second Amended and Restated Revolving Credit
              and Security Agreement among BNY Financial Corporation,
              NationsBank, N.A., WinCup Holdings, Inc., Radnor Chemical
              Corporation, StyroChem U.S., Inc., Radnor Delaware, Inc. and
              Radnor Holdings Corporation, dated as of March 9, 1998

          27.1  Financial Data Schedule


     (b)  Reports on Form 8-K

          There were no reports filed on Form 8-K during the three month period
          ended June 26, 1998.


                                      11
<PAGE>
 
                                   SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned, its duly authorized officer and chief financial officer.


                                    RADNOR HOLDINGS CORPORATION
                                    (registrant)

                                    /s/ Michael V. Valenza    
                                    ---------------------------------------    
Date:  August 5, 1998               By:
                                    Michael V. Valenza
                                    Senior Vice President-Finance and
                                    Chief Financial Officer


                                      12