Dear Colleagues,
PT provider UCLSB invites you to take part in Interlaboratory Technical Project MC 06/2026. Test subjects will be: Bitumen and bitumen products, according to the pointed standards and parameters in the following table:
| Test subject | Code of the standard | Name of the standard | Tested parameters (characteristics) |
|---|---|---|---|
| Bitumen and bitumen products | EN 1426 | Bitumen and bituminous binders - Determination of needle penetration. | Needle penetration /ua/ |
| EN 1427 | Bitumen and bituminous binders - Determination of the softening point - Ring and Ball method. | Softening point - Ring and Ball method /ua/ | |
| EN 12593 | Bitumen and bituminous binders - Determination of the Fraass breaking point. | Fraass breaking point /ua/ | |
| EN ISO 2592 | Petroleum and related products - Determination of flash and fire points - Cleveland open cup method (ISO 2592:2017). | Flash point /ua/ | |
| EN 15326 | Bitumen and bituminous binders - Measurement of density and specific gravity - Capillary-stoppered pyknometer method. | Density /ua/ | |
| EN 12592 | Bitumen and bituminous binders - Determination of solubility. | (Determination of) Solubility /ua/ |
/ua/ - under accreditation, within the scope of accreditation of the PT provider; /oa/ - out of the scope of accreditation of the PT provider
- “Invitation for participation” (QF 7.2-3) in MC 06/2026;
- “Application form” (QF 7.2-4) for MC 06/2026;
- "Detailed plan for proficiency testing" (QF 7.2-1) for MC 06/2026;
Additional information regarding Interlaboratory Technical Project (ITP) MC 06/2026.
Deadline for accepting applications for participation: 01.10.2026;
• Payment deadline: 01.10.2026;
• Sending the samples to the participants: by 06.11.2026 at the latest;
• Conducting the tests: 07.12-11.12.2026
• Preparation of the final report: no later than 31.01.2027;
Detailed information will be given in the instruction for conducting the interlaboratory comparison and proficiency test QF 7.2-5. You will be informed about all other changes that may be imposed during the course of MC 06/2026 by e-mail.
Please, in case you have any questions, do not hesitate to contact us via e-mails [email protected] or [email protected]!
*The date indicated as the start of the respective project is also the date from which the acceptance of participation requests begins.
** Requests for the relevant project, in English and Bulgarian, can be found in the "PT schemes" section of our website: https://ptprovider.sslsb.org/
*** The due date of the relevant project means that this is the deadline for the preparation of the report, unless otherwise stated in the instruction (QF 7.2-5).
Note : All participants will receive further instructions for the process of implementing the relevant PT scheme. The minimum number of participants for a parameter to be included in the relevant PT scheme is 5.