SURVEY QUESTIONAIRE AND SCREENING CRITERIAFOR PURCHASING OF THE SULFOLANE – (CAS NUMBER: 126-33-0) FOR PARA-XYLENE PRODUCTION UNIT IN 2026 – 2028

Nghi Son Refinery & Petrochemical Limited Liability Company (NSRP) is planning for procurement of Sulfolane Chemical to select suitable supplier for supply the good.

If your company is interested in those procurement packages, please fill in and the complete questionnaire below then send email to hieu.nd@nsrp.com.vn  “Response for Questionnaire for Purchasing of Sulfolane” by 23^rd November 2025 at the latest. For the avoidance of doubt, this notice does not constitute any contractual offer, binding promise or guarantee of business by NSRP.

Please answer the questions below:

PART 1. SURVEY QUESTIONNAIRE

QUESTION 1: 

Does your Company/Manufacturer have the necessary business licenses, permits, and certificates to produce and trade Sulfolane, including all required certificates for handling and exporting chemicals?

1.  Yes ☐

2.  No   ☐

If yes, please provide evidence. (Local distributor must have the authorized letter from Manufacturer. The authorized letter must be valid from 2026 through end of 2028)

QUESTION 2: 

Does your Company/Manufacturer have verifiable experience in supplying high-purity 99.5% Sulfolane and meet the requirements in Appendix 1 below.

1.  Yes ☐

2.  No   ☐

If yes, please provide us with the following evidence:

• General description of the contracts.
• Contract value; contract duration.
• Time of the contracts.

QUESTION 3: 

Does your Company/Manufacturer have the production capacity and logistics to supply approximately 160 tons/year by isotank of Sulfolane for the period 2026-2028, with the first tentative delivery of 160 tons in 2026?

1.  Yes ☐

2.  No   ☐

If yes, please provide us with a full copy of your production/import plan for these years.

QUESTION 4: 

a. Is your Company/Manufacturer certified for ISO 9001 (Quality Management Systems) and ISO 14001 (Environmental Management Systems)?

1.  Yes ☐

2.  No   ☐

b. Are your quality control procedures specifically designed to ensure the consistent high purity of Sulfolane and control critical impurities such as Oxygen, Chloride and Water?

1.  Yes ☐

2.  No   ☐

c. Does your company have an HSE (Health, Safety, Environment) policy document

1.  Yes ☐

2.  No   ☐

If yes, please provide the evidence and certification.

QUESTION 5:

In the event of a suspected chemical quality issue impacting on our unit’s performance (e.g., Sulfolane Degradation, Sulfolane bad color or low PH issue), do you have a dedicated technical service team ready at NSRP site?

1.  Yes ☐

2.  No   ☐

If yes, please provide protocol and contact information about the service team.

QUESTION 6:

The standard required lead time is 60 days. What is the lead time of your company for supplying (the time from receiving a purchase order to delivering the goods to NSRP plant at Nghi Son Economic Zone, Hai Binh Ward, Thanh Hoa Province, Vietnam)?

1. Less than 60 days
2. From 60 months to 90 days
3. More than 90 days

Appendix 1

GOODS SPECIFICATIONS OF SULFOLANE

http://nsrp.vn/wp-content/uploads/2025/11/Question-and-Screening-Criteria-Sulfolane-Nov-25_Updated.docx