Interlaboratory technical project МС 10/2025 (Ongoing)

Interlaboratory Technical Project МС 10/2025 (Ongoing)

Dear Colleagues,

PT provider UCLSB invites you to take part in Interlaboratory Technical Project MC 10/2025. Test subjects will be: Rock/Aggregates (sand), according to the pointed standards and parameters in the following table:

Test subject	Code of the standard	Name of the standard	Type/characteristic of test	Range of expected values
Rock/Aggregates (Sand)	EN 933-1	Tests for geometrical properties of aggregates - Part 1: Determination of particle size distribution - Sieving method	Particle size distribution #8 mm;#4mm;#2mm; #1 mm;#0.500;#0.250 mm; #0.125 mm;#0.063 mm /three determinations/	Faction 0-4
	EN 1097-3	Tests for mechanical and physical properties of aggregates - Part 3: Determination of loose bulk density and voids.	Loose bulk density /three determinations/	1,20 - 1,70 Mg/m3
	EN 933-8	Tests for geometrical properties of aggregates - Part 8: Assessment of fines - Sand equivalent test.	Sand equivalent test /three determinations/	More than ≥60%

“Invitation for participation” in MC 10/2025;
“Application form” for MC 10/2025;
"Detailed plan for proficiency testing" for MC 10/2025;

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Additional information regarding Interlaboratory Technical Project (ITP) MC 10/2025.

Deadline for accepting applications for participation: 10.10.2025;

• Sending the samples to the participants: by 31.10.2025 at the latest;

• Preparation of the final report: no later than 30.12.2025;

Detailed information will be given in the instruction for conducting the interlaboratory comparison and proficiency test. You will be informed about all other changes that may be imposed during the course of MC 10/2025 by e-mail.

Please, in case you have any questions, do not hesitate to contact us via e-mails sslsb@abv.bg or sslsb@yahoo.com!

*The date which is pointed as a beginning of the relevant project is the date when acceptance of the applications starts.

** 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 end of the relevant project means that this is the deadline for the report to be prepared in case nothing else is stated in the instruction form.

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.

Application form

Name of the laboratory

Number of the certificate for accreditation

Don't fill me out ^*

Manager of the laboratory

Contact person

Country/Town

Pot code

Address

Phone

Fax

E-mail

Name of the entity

Adress

National Statistic Number

Vat Registration Number

Person who will receive the invoice

Address for delivering of the invoice

EN 933-1 Tests for geometrical properties of aggregates - Part 1: Determination of particle size distribution - Sieving method.

EN 1097-3 Tests for mechanical and physical properties of aggregates - Part 3: Determination of loose bulk density and voids.

EN 933-8 Tests for geometrical properties of aggregates - Part 8: Assessment of fines - Sand equivalent test.

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