Document:

<PAGE>

                                                                   EXHIBIT 10.28

                           SALE AND PURCHASE AGREEMENT

THIS AGREEMENT is made on March 7,2007.

BETWEEN:

(1) SINOLINK DEVELOPMENT LIMITED, whose registered office is at: Suite 901B
9/FiA Kinwick CentreiA32 Hollywood RoadiA CentraliAHong Kong (THE BUYER); and

(2) BAODING TIANWEI YINGLI NEW ENERGY RESOURCES CO. LTD., whose registered
office is at No.3055 Middle Fuxing Road, Baoding (071051) CHINA (THE SELLER/THE
MANUFACTURER).

WHEREBY IT IS AGREED as follows:

1.    The Seller undertakes to supply eight (8) megawatt solar modules (the
      "Product") to the Buyer for the delivery duration from April 2007 to Dec
      2007. The Seller undertakes to supply the said product in accordance with
      the Monthly Delivery Plan confirmed by the Parties at least two weeks in
      advance before the new month begins, otherwise the Seller shall liable for
      the cost of obtaining equivalent products.

2.    The Seller shall sell and the Buyer shall purchase the Products specified
      below:

      2.1   Product Description: 160Wp-180Wp, 1310x990x50 and/or 1580x808x50
            Poly-crystal silicon solar module (including connectors and cables)

      2.2   Price per watt: USD[-]*1 F.O.B. (Upper limit) for the delivery
            duration period between April 2007 to Dec 2007, quarterly price
            review between the parties shall be carried one month before the new
            quarter begins, the price quoted from the Seller to the Buyer is the
            most favorable price, and in accordance with the market situation.

3.    The technical specification (see appendix and/or attachments), the
      particular conditions, the general conditions and warranties supplied by
      the Seller to the Buyer shall be deemed to form and be read and construed
      as part of this Agreement. Each party represents to the other party that
      all representations made by it pursuant to the Agreement are true and
      accurate as of the date of this Agreement. The Seller undertakes to give
      the Buyer prior written notice for any amendment, alteration to the said
      products. The Buyer can decide either to accept or refuse the delivery of
      the modified products. The Seller undertakes to fully comply all technical
      specifications provide by the Buyer. The standard of measurement shall
      according to the test reports from the Frauenhofer Institute provided by
      the Buyer from time to time.

--------------------
* INFORMATION INTENTIONALLY OMITTED; CONFIDENTIAL TREATMENT HAS BEEN REQUESTED
FOR SUCH INFORMATION, AND SUCH INFORMATION HAS BEEN SEPARATELY FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION.

                                       1

<PAGE>

4.    The Consideration shall be paid by the Buyer to the Seller as follows:

      4.1   The currency used for the transactions can be settled either in US
            dollar or EURO. The Seller agrees the Buyer can choose the most
            preferable currency upon placing the purchase order.

      4.2   All prices quoted from the Seller to the Buyer is F.O.B. (Free On
            Board). The Seller undertakes to give the Buyer the most favorable
            price both for unit projects and for regular roof-top project
            orders.

      4.3   The pattern of payment shall be: [-]*. The Seller shall provide
            the proof information of the freight forwarder that the products
            invoiced have been shipped to the Buyer. Such information will
            usually be provided via the Bill of Lading, a packing list,
            certificate of origin and the commercial invoice.

5.    Time of Shipment. Within 24hours after the inspection of goods by the
      Buyer or its authorized representatives.

6.    Completion documentation shall consist as follows:

      6.1   Full set of Bills of Lading.

      6.2   Three set of invoice.

      6.3   Three set of Packing List.

      6.4   Shipment Notice from the Seller. The Seller shall inform the Buyer
            within 24 hours of the shipment dispatched of the name of the
            vessel, voyage number, date, quantity, weight and value of the
            shipment by fax. The Bill of Lading, invoice and packing list shall
            be faxed to the Buyer when it's available, followed with original
            copy courier to the Buyer's Representative Office in Beijing.

7.    Packing and Shipment.

      7.1   Package. Seaworthy packing, the Seller undertakes the packing is
            free from any mechanical, chemical, corrosion or other damage
            sustained during transport, handling, storage, erection or
            subsequent to erection.

      7.2   All components shall have a bar code or serial number, main
            component shall consist technical specification label on its back,
            detailed bar code or serial numbers of the components shall be seen
            outside the box or carton.

      7.3   Port of Loading: Xingang, Tianjin, China.

      7.4   Port of Destination: Seaport Germany.

--------------------
* INFORMATION INTENTIONALLY OMITTED; CONFIDENTIAL TREATMENT HAS BEEN REQUESTED
FOR SUCH INFORMATION, AND SUCH INFORMATION HAS BEEN SEPARATELY FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION.

                                       2

<PAGE>

      7.5   The Seller shall at all times and at its own expense strictly comply
            with all applicable laws, rules, regulations and government orders,
            now or hereafter in effect, relating to the export with respect to
            the Products or its performance of this Agreement.

8.    The Seller shall responsible for the safety and free from any damages of
      the products prior the products on board. The Buyer shall responsible for
      the transportation insurance thereafter.

9.    Warranties and Technical Specification.

      9.1   The Seller/Manufacture warrants that all the product supplied to the
            Buyer, includes but not limited to all relevant accessories,
            devices, parts, connectors, cord and wires supplied to the Buyer
            and/or its principals are manufactured from approved materials that
            is fully comply with industry standard (IEC61215, CE and TUV safety
            Class II) and/or in accordance with the Buyers recommendations and
            will have a full warranted period of 60 months from the date of
            shipment for the replacement and exchange of affected product.

      9.2   The Seller/Manufacture shall only be liable for: (a) the cost of
            replacing the product, labor cost associated with the installation
            or removal of affected product; (b) the cost of obtaining equivalent
            product; (c) the cost of shipment and transportations for product
            exchange and replacement; or (d) the cost of having the project
            repaired, replaced, whichever is the lower.

      9.3   Specification. The specification of solar panel will be indicated in
            the labels. Power tolerance shall be (a) all positive (+%) for each
            container; and (b) -3%to+3% for each module within the same
            container.

      9.4   The Seller/Manufacture confirms and provides the Buyer with
            IEC61215, CE and TUV safety class II certifications. And any other
            certifications from time to time should there are any new changes or
            amendments to the Products.

      9.5   The Seller shall provide the Buyer flash-testing results of the
            products before each shipment. The reference panel for flash-testing
            shall be based on measurement of the Frauenhofer Institute in
            Germany.

      9.6   The Manufacturer represents and warrants to the Buyer that the solar
            panel to be free from any defects in the absence of misapplication,
            mis-installation or omission on the part of the Seller. Without
            prejudice to any other remedy available to the Buyer, the
            Manufacture promises that it shall provide free repair, replacement
            or buy-back from the customer on the date of purchase price within
            60 months from the date of the shipment which appears on the Bill of
            Lading. The Manufacture further guarantees that the output power of
            its PV module will reach 90% or above during the first 10 years from
            the date of installation, 80%

                                       3

<PAGE>

            or above within 25 years from the date of installation, otherwise
            free replacement or buy-back according purchase price services will
            be provided by the Manufacture.

10.   General Terms.

      10.1  The Seller agrees not directly or engage any person, agent,
            associates, or consultant in sell, market or distribute the Products
            to the Buyer's principals or customers without obtain prior written
            consent from the Buyer.

      10.2  The Seller shall assist the Buyer in contact the Buyer's shipping
            forwarder ten days in advance of each shipment to ensure the
            shipment can be booked and collected by the Seller.

      10.3  Inspection before shipment. The Buyer or its duly authorized
            representative shall carry out inspection of the goods in the
            Manufacture's site, and shall issue a duplicate letter of inspection
            to the parties. If the Buyer or its representative fails to carry
            out the inspection three days prior the shipment, the Seller may
            deemed the goods has been duly inspected and satisfied by the Buyer,
            and the Seller can dispatch the shipment. The Buyer shall carry out
            further inspections whenever the Buyer feels it is appropriate or
            necessary.

      10.4  Each of the obligations, warranties and undertakings set out in this
            Agreement which is not fully performed at completion will continue
            in force after completion.

      10.5  Confidentiality. Neither party shall disclose the terms of this
            Agreement to any third party except as required by laws or as
            reasonable required to protect or enforce a party's rights. The
            disclosing party shall provide the other with prior written notice
            of any such required disclosure.

11.   Dispute Resolution. Any dispute or difference arising out of or in
      connection with this Agreement shall first be settled amicably between the
      parties. If the negotiation is abandoned by either party, then such
      dispute or difference shall be referred to and determined by arbitration
      at Hong Kong International Arbitration Center and in accordance with its
      Domestic Arbitration Rules.

12.   This Agreement shall in all respects is governed by and shall be
      interpreted in accordance with the Domestic Laws.

                                       4

<PAGE>

AS WITNESS the hands of the parties hereto the date first hereinbefore written.

SIGNATORIES

SIGNED by /s/ Liansheng Miao
          --------------------------------------------
Liansheng Miao, Chief Executive Officer for and on
behalf of
THE BUYER
in the presence of:

SIGNED by /s/ Tianyi Shi
          --------------------------------------------
Tianyi Shi
for and on behalf of
THE SELLER
in the presence of:

                                       5<PAGE>
                                                                   EXHIBIT 10.29

                                SUPPLY AGREEMENT

between                    Wacker Chemie AG
                           Hanns-Seidel-Platz 4
                           81737 Munich
                           Federal Republic of Germany

                           - hereinafter referred to as "WACKER" -

and                        Tianwei Yingli New Energy Resources Co.Ltd
                           No. 3055 Middle Fuxing Road
                           Bao Ding City
                           P.R.China (071051)

                           - hereinafter referred to as "BUYER" -

PREAMBLE

BUYER has requirements for polycrystalline Silicon. WACKER is willing to supply
BUYER with polycrystalline Silicon.

Now, therefore, in consideration of the foregoing and the mutual premises
hereinafter contained, WACKER and BUYER agree as follows:

1.       PRODUCT

WACKER agrees to sell and deliver and BUYER agrees to purchase and take the
polycrystalline Silicon manufactured by WACKER as defined per specification set
forth in APPENDIX A (hereinafter referred to as "PRODUCT").

2.       QUANTITIES

2.1      The BUYER shall make the agreed prepayment according to the payment
         schedule set forth in APPENDIX A.

         WACKER shall sell and deliver to BUYER and BUYER will purchase and take
         from WACKER the annual quantities of PRODUCT set forth in APPENDIX A.

3.       PRICES / PAYMENT TERMS

3.1      The prices for the PRODUCT are set forth in APPENDIX A.

3.2      The prices under Section 3.1 above shall be firm until 31.12.2017 and
         only subject to change, if the relevant energy price index, defined in
         APPENDIX C, increases or decreases by more than 20%. The agreed prices
         will be adjusted by the rate (Euro/kg) as specified in the table in
         APPENDIX C.

<PAGE>
                                                                               2

3.3      WACKER shall invoice BUYER with each shipment of PRODUCT. BUYER shall
         pay such invoices net within [-]* ([-]*) days from the date of such
         invoices.

4.       DELIVERY

4.1      PRODUCT shall be delivered FOB German seaport (Incoterms 2000).

4.2      All deliveries of PRODUCT are subject to WACKER's General Conditions of
         Sale set forth in APPENDIX B and hereby made part of this Agreement,
         provided, however, that if there is any conflict between the terms of
         this Agreement and the said Conditions of Sale the terms of this
         Agreement shall prevail.

4.3      The agreed annual quantities for the years 2009, 2010, 2011, 2012,
         2013, 2014, 2015, 2016 and 2017 will be shipped in about equal monthly
         installments.

5.       QUALITY / INSPECTION AND TESTING

5.1      The PRODUCT supplied by WACKER shall conform to the specifications set
         forth in APPENDIX A.

5.2      It is understood and expressly agreed that the PRODUCT delivered by
         WACKER hereunder are PRODUCTS of technical quality only and BUYER is
         exclusively responsible for fitness for purpose, handling, use and
         application of the PRODUCT.

5.3      Upon receipt of each shipment of PRODUCT BUYER shall inspect the
         PRODUCT. Unless BUYER notifies WACKER within [-]* ([-]*) days after the
         arrival of the shipment at Buyer's premises or warehouse, that it does
         not conform to the quantity ordered or WACKER's certificate of quality
         does not conform to the specifications set forth in APPENDIX A, said
         shipment shall be deemed to have been delivered as ordered and WACKER's
         certificate of quality shall be deemed to conform to the
         specifications.

6.       WARRANTY/LIABILITY

6.1      WACKER warrants solely that the PRODUCT delivered shall conform to the
         specifications set forth in APPENDIX A. Except for the warranty
         provided above, WACKER disclaims any and all other express or implied
         warranties with respect to the PRODUCT, and any warranty of
         merchantability or fitness for a particular purpose is expressly
         disclaimed.

6.2      BUYER's exclusive remedy and WACKER's sole obligation for any claim or
         cause of action arising under this Agreement because of defective
         PRODUCT is expressly limited to either (i) the replacement of
         non-conforming PRODUCT or the repayment of the purchase price of the
         respective quantity of PRODUCT; OR (ii) payment not to exceed

----------

* INFORMATION INTENTIONALLY OMITTED; CONFIDENTIAL TREATMENT HAS BEEN REQUESTED
FOR SUCH INFORMATION, AND SUCH INFORMATION HAS BEEN SEPARATELY FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION.

<PAGE>
                                                                               3

         the purchase price of the specific quantity of PRODUCT for which
         damages are claimed. Any remedy is subject to BUYER giving WACKER
         notice as provided for in Section 5.3.

6.3      The parties agree that the remedies provided in this Agreement are
         adequate and that except as provided for above, neither party shall be
         liable to the other, whether directly or by way of indemnity or
         contribution for special, incidental, consequential or other damages
         arising from the breach of any obligation hereunder or for any other
         reason whatsoever, including actions for tort, strict or product
         liability, patent or trademark infringement except as provided for
         herein.

7.       CONFIDENTIALITY

7.1      BUYER may use all the information disclosed by WACKER under this
         Agreement only for the purposes contemplated herein.

7.2      BUYER agrees to keep secret such information and to take the necessary
         measures to prevent any disclosure to third parties.

7.3      BUYER is responsible for assuring that secrecy is maintained by its
         employees and agents.

7.4      The secrecy obligation does not apply to information

         -        where BUYER can prove that is was known to BUYER prior to its
                  receipt;

         -        which is or has become generally available to the public prior
                  to its receipt;

         -        which is or has become generally available to the public
                  without being the result of a breach of this Agreement;

         -        which is in accordance with information BUYER received or got
                  access to from an entitled person without any obligation of
                  secrecy;

         -        where WACKER approved the disclosure in a particular case in
                  writing.

7.5      The secrecy obligation shall survive the term of this Agreement.

8.       SECURITY INTEREST

         BUYER hereby grants WACKER a continuing security interest in any
         PRODUCT and in the proceeds (including proceeds of sale or insurance)
         until the entire purchase price for the PRODUCT currently or previously
         sold to BUYER is paid and until all late payment interest, legal fees
         and expenses required to enforce WACKER's rights and any costs,
         expenses, taxes or other charges required to be paid by BUYER to WACKER
         have been paid in full. BUYER specifically agrees that WACKER may file
         one or more financing statements or other documents and take all
         necessary or appropriate in order to create, perfect, preserve or
         enforce WACKER's security interest in the PRODUCT pursuant to the
         Uniform Commercial Code and other applicable law, and hereby grants to
         WACKER a power of attorney to execute such statements or documents in
         BUYER's name. WACKER's reasonable costs and expenses (including, but
         not limited to, attorney's fees and expenses for pursuing, searching
         for, receiving, taking, keeping, storing, advertising
<PAGE>
                                                                               4

         and selling the PRODUCT shall be paid by BUYER who shall remain liable
         for any deficiency resulting from a sale of the PRODUCT and shall pay
         any deficiency forthwith on demand. The requirement of reasonable
         notice of sale shall be met if such notice is mailed and addressed to
         BUYER at its last address appearing on WACKER's records at least 30
         days prior to the date of sale.

9.       FORCE MAJEURE

9.1      If either party should be prevented or restricted directly or
         indirectly by an event of Force Majeure as hereinafter defined from
         performing all or any of its obligations under this Agreement, the
         party so affected will be relieved of performance of its obligations
         hereunder during the period that such event and its consequences will
         continue, but only to the extent so prevented, and will not be liable
         for any delay or failure in the performance or any of its obligations
         hereunder or loss or damage whether direct, general, special or
         consequential which the other party may suffer due to or resulting from
         such delay or failure, provided always that prompt notice is given by
         the affected party to the unaffected party by facsimile or telephone of
         the occurrence of the event constituting the Force Majeure, together
         with details thereof and an estimate of the period of time for which it
         will continue.

9.2      The term Force Majeure shall include without limitation strike, labor
         dispute, lock out, fire, explosion, flood, war (accident), act of god
         or any other cause beyond the reasonable control of the affected party,
         whether similar or dissimilar to the causes enumerated above.

10.      ASSIGNMENT

         This Agreement or any part thereof is not assignable by either party
         without the prior written consent of the other party.

11.      ENTIRE AGREEMENT

11.1     This Agreement constitutes the whole agreement between the parties as
         to the subject matter thereof and no agreements, representations or
         warranties between the parties other than those set out herein are
         binding on the parties.

11.2     No waiver, alteration, or modification of this Agreement shall be valid
         unless made in writing and signed by authorized representatives of the
         parties.

12.      SEVERABILITY

         In the event, any provision of this Agreement shall be declared
         invalid, illegal or unenforceable, the validity, legality and
         enforceability of the remaining provisions shall not in any way be
         affected or impaired thereby.

<PAGE>
                                                                               5

13.      HEADINGS

         The headings of the articles of this Agreement are inserted for
         convenience only and shall not be deemed to constitute a part of this
         Agreement or to affect the construction hereof.

14.      DURATION / TERMINATION

14.1     This Agreement will commence on the 01.01.2007 and will endure for a
         defined period of 11 (eleven) years.

15.      APPLICABLE LAW/ JURISDICTION

         This Agreement shall be construed and the legal relations between the
         parties hereto shall be determined in accordance with the laws of
         Germany; the application of the 1980 United Nations Convention on
         Contracts for the International Sale of Goods is expressly excluded.

         Exclusive place of jurisdiction shall be Munich.

<TABLE>
<S>                       <C>                         <C>
Wacker Chemie AG                                      Tianwei Yingli New Energy Resources Co. Ltd
WACKER POLYSILICON

Date: November 13, 2006                               Date: November 13, 2006

 /s/ Eward Shindlbeck    /s/ Reimund Huber            /s/ Liansheng Miao
-----------------------  --------------------------   -------------------------------------------

Ewald Schindlbeck        Reimund Huber
President                Director Marketing & Sales
</TABLE>

<PAGE>
                                                                               6

APPENDIX A

SOLARQRADE POLYSILICON

SPECIFICATION PCL-NCS (B)

<Table>
<Caption>
Calendar year               Annual quantity (kg)        Price EURO/kg
                                                        FOB German Seaport
<S>                         <C>                         <C>
2009                        [-]*                        [-]*
2010                        [-]*                        [-]*
2011                        [-]*                        [-]*
2012                        [-]*                        [-]*
2013                        [-]*                        [-]*
2014                        [-]*                        [-]*
2015                        [-]*                        [-]*
2016                        [-]*                        [-]*
2017                        [-]*                        [-]*
</Table>

PREPAYMENT SCHEDULE

The BUYER will prepay the amount of [-]* Euro/kg for the total above agreed
contract quantity. The invoices, regarding deliveries up to the annual agreed
quantity, will be reduced by [-]* Euro/kg with each shipment. So WACKER's
invoice will state the above agreed prices on the invoice, but will make note,
that the BUYER has only to pay the invoice amount reduced by [-]* Euro/kg. [-]*
Euro/kg of the prepayment remain at WACKER.

Regarding to the agreed annual quantities the total prepayment amount of Euro
[-]* ([-]*) has to be paid according to the following schedule on the account of
Wacker Chemie AG:

January 5th, 2007     Euro [-]* ([-]*)

In case the BUYER does fail to take the full amount of the agreed annual
quantity in one respective calendar year, WACKER does not have to repay the not
absorbed outstanding prepayment (regarding the respective calendar year), BUYER
also doesn't have the right to set this prepayment against deliveries of the
following year.

----------

* INFORMATION INTENTIONALLY OMITTED; CONFIDENTIAL TREATMENT HAS BEEN REQUESTED
FOR SUCH INFORMATION, AND SUCH INFORMATION HAS BEEN SEPARATELY FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION.

<PAGE>
                                                                               7

                                   APPENDIX B

                           GENERAL CONDITIONS OF SALE

1.       GENERALLY:

All our supplies and services as well as all contracts concluded with us are
exclusively subject to the following conditions of sale. Terms of the Purchaser
which contradict or which deviate from our sales terms and which are not
expressly recognised by us are not valid even if we do not expressly object to
them. Where a continuing business relationship exists, all future contracts,
supplies and services are also subject to our conditions of sale.

2.       OFFER, CONCLUSION OF CONTRACT:

Our offers are subject to change and non-binding. Orders are only valid if
confirmed by us in writing or if recognised by us through the act of delivery.
Any additional verbal agreements, supplements and modifications are also only
valid if confirmed in writing.

3.       DELIVERY, DEFAULT:

3.1      Unless otherwise agreed, any dates quoted for delivery are non-binding.

3.2      We are entitled to make partial deliveries as far as the Purchaser must
         reasonably accept this in the circumstances of an individual case. The
         corresponding invoices issued are payable without regard to whether
         complete delivery has been made.

3.3      In the event delivery is delayed, the Purchaser may set us a reasonable
         grace period with the notice that he rejects the acceptance of the
         delivery item after expiry of the grace period. After the expiry of the
         grace period, the Purchaser is entitled to cancel the contract of sale
         through written notice or to request damages instead of performance.

         At our request the Purchaser is obligated to state within a reasonable
         period whether he cancels the contract due to delay in delivery, seeks
         damages instead of performance or insists on performance.

3.4      Our liability is set forth in para. 9. Furthermore in the event of
         slight negligence, our liability is limited to the invoice value of the
         respective delivery item.

4.       RETURN OF LOAN PACKAGING:

In the event of delayed return (meaning in the event normal uploading times are
exceeded) of loading equipment, loading banks and other loan packaging we
reserve the right to charge the Purchaser for the costs incurred by us.

5.       PRICES:

5.1      Unless otherwise expressly agreed, prices are quoted "ex works"
         excluding packaging and plus delivery and shipping costs as well as
         plus any applicable Value Added Tax.

<PAGE>
                                                                               8

5.2      The prices valid on the day of dispatch shall apply.

Should the latter be higher than the contractual price, the Purchaser is
entitled to cancel the contract with regard to the quantities still to be
delivered. Cancellation shall be made within 14 days after notification of said
price increase.

6.       PAYMENT:

6.1      The payment shall be made in Euro to one of our bank accounts indicated
         on the reverse side.

6.2      Should Purchaser be in arrears with payment, interest for default shall
         be due and payable at 12%, but at least 8% above the respective base
         interest rate. We reserve the right to claim further damages. If the
         interest we claim is higher than the statutory interest for delayed
         payment, the Purchaser has the right to demonstrate lower damages just
         as we have the right to show that greater damages were incurred.

6.3      Should Purchaser be in arrears with payment or should there be
         reasonable doubts as to Purchaser's solvency or credit rating, we are
         -- without prejudice to our other rights -- entitled to require payment
         in advance for deliveries not yet made, and to require immediate
         payment of all our claims arising from the business relation.

6.4      Bills of exchange and cheques shall be accepted upon separate agreement
         and only by way of payment. All expenses incurred in this regard shall
         be borne by the Purchaser.

6.5      Only uncontested or legally proved claims shall entitle the Purchaser
         to set-off or withhold payment.

7.       FORCE MAJEURE:

Events of Force Majeure, in particular strikes, lock outs, operation or
transport interruptions, including at our suppliers, shall suspend the
contractual obligations of each party for the period of the disturbance and to
the extent of its effects. Should the delays caused exceed a period of 6 weeks,
both parties shall be entitled to cancel the contract, with respect to the
contractual performance affected by such delays. No other claims exist.

8.       QUALITY:

8.1      All our data, especially data relating to product suitability,
         processing and use, as well as to technical support, have been compiled
         to the best of our knowledge. The Purchaser, however, must still
         perform his own inspections and preliminary trials.

8.2      The Purchaser undertakes to examine the goods immediately after
         delivery with respect to any defects concerning quality and suitability
         of purpose and object to ascertainable defects. Sample testing shall
         also be performed if this can be reasonably expected of the Purchaser.
         Failure to proceed in aforesaid manner shall result in the goods being
         regarded as accepted.
<PAGE>
                                                                               9

8.3      Complaints must be made within 8 days after receipt of the goods. In
         case of hidden faults, however, complaints are to be made immediately
         on discovery, within one year after receipt at the very latest. Said
         claims shall only be taken into consideration if and when made in
         writing and with the relevant documentation attached. To comply with
         the time limit it shall be sufficient if the complaint is sent in good
         time.

8.4      We are not liable on the basis of public statements by us, the
         manufacturer or his agents, if we were not aware of the statement or
         were not required to have knowledge thereof, the statement was already
         corrected at the time of the purchase decision or the Purchaser cannot
         show that the statement influenced his purchase decision.

8.5      We are not liable for defects which only marginally reduce the value or
         the suitability of the object. A marginal defect exists in particular
         if the defect can be removed by the Purchaser himself with
         insignificant effort.

8.6      If the Purchaser requests replacement performance due to a defect, we
         may choose whether we remove the defect ourselves or deliver a
         defect-free object as a replacement. The right to reduce the price or
         cancel the contract in the event of unsuccessful replacement
         performance shall remain unaffected.

8.7      Where complaints are justified, the goods may only be returned to us at
         our expense if after we receive notice of the defect we do not offer to
         collect or dispose of the goods.

8.8      If increased costs arise because the Purchaser has transferred the
         goods to a place other than his commercial place of business, we shall
         charge the Purchaser for the increased costs in connection with the
         remedying of the defect, unless the transfer corresponds to the
         designated use of the object.

8.9      Damage and claims for reimbursement of expenses shall remain unaffected
         as far as not excluded by para. 9.

8.10     All claims due to a defect are subject to a limitation period of one
         year after delivery of the object. No warranty is made for used
         objects. The statutory limitation period for objects which are used for
         a building structure in accordance with their usual manner of use, and
         which cause the defectiveness thereof, shall remain unaffected.

8.11     The rights of the Purchaser under Sections 478, 479 German Civil Code
         remain unaffected.

9.       LIABILITY:

Our liability is excluded, regardless of the legal grounds.

This shall not apply in the event of intentional actions or gross negligence by
us or our legal representatives or agents or in the event of breach of material
contractual duties.

In the event of a slightly negligent breach of material contractual duties, our
liability is limited to twice the invoice value of the respective delivery item.
For damages due to delayed performance para. 3.4 shall also apply. Our liability
for damages due to injury to life, the body or health, the

<PAGE>
                                                                              10

liability based on a guarantee and under mandatory statutory provisions, in
particular the Product Liability Act, remain unaffected.

10.      RESERVATION OF OWNERSHIP:

10.1     The goods that have been sold remain our sole property until all
         outstanding debts arising from the business connection with the
         Purchaser have been paid in full. The Purchaser has power of disposal
         of the purchased goods in the ordinary course of business, or he may
         process the goods until revocation by us.

10.2     Reservation of ownership and power of disposal, as laid down in clause
         10.1, also apply to the full value of the manufactured goods produced
         by processing, mixing and blending or combining our goods. In each case
         we qualify as the manufacturer. In cases where the goods are processed,
         mixed and blended or combined with those of a third party, and where
         the reservation of the latter continues to apply, then we acquire joint
         ownership in proportion to the invoice value of those processed goods.
         If security rights of a third party are in fact or in law below that
         share, the difference will be to our benefit.

10.3     If the Purchaser resells our goods to third parties he hereby assigns
         the entire resulting payment claim -- or in the amount of our joint
         share therein (see para. 10.2) -- to us. In the event the parties agree
         on a current account, the respective balance amounts shall be assigned.
         However, the Purchaser shall be entitled to collect such payment claim
         on our behalf until we revoke such right or until his payments are
         discontinued. The Purchaser is only authorized to make assignment of
         these claims -- even only for the purpose of collection by way of
         factoring -- with our express written consent.

10.4     The Purchaser shall immediately give notice to us if any third party
         raises any claim with respect to such goods or claims which are owned
         by us.

10.5     If the value of the collateral exceeds our accounts receivable by more
         than 20% then we will release collateral on demand and at our
         discretion.

10.6     We are also entitled to take back goods on the basis of the reservation
         of title, even if we have not previously cancelled the contract. If
         products are taken back by way of the exercise of the reservation of
         ownership, this shall not constitute cancellation of the contract.

10.7     If the laws of the country in which the goods are located after
         delivery do not permit the Vendor to retain the title to said goods,
         but allow the retention of other similar rights to the delivery item,
         the Purchaser shall provide us with such other equivalent right. The
         Purchaser undertakes to assist us in the fulfilment of any form
         requirements necessary for such purpose.

11.      PLACE OF FULFILMENT, APPLICABLE LAW AND JURISDICTION:

11.1     The originating point of the goods shall, in each case, be the place of
         fulfilment for the delivery. Munich shall be the place of fulfilment
         for payment.

<PAGE>
                                                                              11

11.2     Exclusively the laws of the Federal Republic of Germany shall apply
         between the parties. The application of the 1980 United Nations
         Convention on Contracts for the International Sale of Goods is
         expressly excluded.

11.3     If the Purchaser is a merchant or does not have a general place of
         jurisdiction in Germany, the place of jurisdiction is Munich. We shall,
         however, have the right to also bring a claim against the Purchaser at
         his general place of jurisdiction.

Munich, 15th May 2002

<PAGE>
                                                                              12

APPENDIX C, PAGE 1 OF 2

Relevant Energy Price Index:

"BAFA Grenzubergangspreis" for natural gas

Source:

<TABLE>
<S><C>
http://www.bmwi.de/BMWi/Navigation/Energie/Energiestatistiken/energiestatistiken,did=53736.html
</TABLE>

Evaluation periods:
--       Arithmetic mean value out of 6 months
--       April to September for price adjustment of 1st half of the following
         year
--       October to March for price adjustment of 2nd half of year
--       Basis evaluation period: April 2006 -- September 2006

Price Adjustment Table:

CB ... Index value of Basis evaluation period
CN ... Index value of New evaluation period

<Table>
<Caption>
CN/CB (%)                   Price Adjustment
                            EURO/kg
<S>                         <C>
< - 60 %                              [-]*
< - 40 %                              [-]*
< - 20 %                              [-]*
> + 20 %                              [-]*
> + 40 %                              [-]*
> + 60 %                              [-]*
> + 80%                               [-]*
etc.                                  etc.
</Table>

On the following example for the calculation of the price adjustment the
procedure is explained in more detail.

----------
* INFORMATION INTENTIONALLY OMITTED; CONFIDENTIAL TREATMENT HAS BEEN REQUESTED
  FOR SUCH INFORMATION, AND SUCH INFORMATION HAS BEEN SEPARATELY FILED WITH THE
  SECURITIES AND EXCHANGE COMMISSION.

<PAGE>
                                                                              13

APPENDIX C, PAGE 2 OF 2

EXAMPLE FOR CALCULATION OF PRICE ADJUSTMENT

[FLOW CHART]

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00123-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00123-of-00352.parquet"}]]