Ground Granulated Blast Furnace Slag (GGBFS S95)

Q: Is the GGBFS CE-marked?

Yes. The notified body 1020, TZÚS Prague, issued certificate of constancy of performance No. 1020-CPR-040081372 to EN 15167-1 under system 1+, first issued on 23 May 2025. The certificate can be downloaded on the certificates page and on the product page.

Q: Is the slag registered under REACH?

Yes. The manufacturer registered slags, ferrous metal, blast furnace (EC 266-002-0, CAS 65996-69-2) through an EU only representative: a full registration for 1,000 t or more, valid until 31 December 2026. EU importers also need a tonnage coverage certificate from the only representative; the GFTx team can advise.

Q: What do the test results show?

In the November 2025 test by TZÚS, the activity index was 98.4 percent at 7 days and 113.1 percent at 28 days, against minimums of 45 and 70 percent. The specific surface was 420 square metres per kilogram, against a minimum of 275. All values met EN 15167-1. The full table is on this page and in the specification sheet.

Ground granulated blast furnace slag (GGBFS) of type S95, a type II addition for concrete, including site-mixed and precast concrete, and for mortar and grout. It is produced by Rizhao Jinghua New-Type Building Materials Co., Ltd. in Rizhao, Shandong Province, China, CE-certified to EN 15167-1 under system 1+ and registered under REACH, and supplied by GFTx with its partner Rizhao Steel.

Standard EN 15167-1Type S95CE System 1+Origin Shandong, China

Specification (PDF) Enquire

GGBFS S95 product label: ground granulated blast furnace slag to EN 15167-1

Specification

Test results to EN 15167-1

Property	Declared performance	Type test, April 2025	Test report, November 2025
Activity index, 7 days	≥ 45 %	97.0 %	98.4 %
Activity index, 28 days	≥ 70 %	129.5 %	113.1 %
Initial setting time	≤ 2 × test cement	201 min	247 min
Specific surface	≥ 275 m²/kg	402 m²/kg	420 m²/kg
Moisture content	≤ 1.0 %	0.04 %	0.04 %
Loss on ignition	≤ 3.0 %	0.29 %	1.35 %
Sulphide content	≤ 2.0 %	0.96 %	1.05 %
Sulphate content (SO₃)	≤ 2.5 %	0.24 %	0.14 %
Magnesium oxide (MgO)	≤ 18.0 %	10.82 %	13.50 %
Chloride content	≤ 0.10 %	0.012 %	0.007 %
Specific gravity	—	—	2,920 kg/m³

Certification & registration

Property	Value
CE certificate	Certificate of constancy of performance No. 1020-CPR-040081372, first issued on 23 May 2025
Standard & system	EN 15167-1:2006 · assessment and verification of constancy of performance, system 1+
Notified body	1020 · Technical and Test Institute for Construction Prague (TZÚS)
Intended use	Concrete, including site-mixed concrete and precast elements, as a type II addition (EN 206+A1); mortar and grout
REACH substance	Slags, ferrous metal, blast furnace · EC 266-002-0 · CAS 65996-69-2
REACH registration	Full registration, ≥ 1,000 t, through an EU only representative · valid from 12 February to 31 December 2026

Supply

Property	Value
Partner	Rizhao Steel, Shandong, China
Manufacturer	Rizhao Jinghua New-Type Building Materials Co., Ltd., West of YanHai Road, South of ShuGang Road, Rizhao City, Shandong Province, China
Also available	Granulated blast furnace slag (unground), on request
Commercial terms	Packing, quantities, price and delivery terms are quoted on request

Values from the reports of the Technical and Test Institute for Construction Prague (TZÚS): the type test of April 2025 (AVCP report No. 040-081371, revision 1), with the loss on ignition corrected for sulphide oxidation, and test report No. 040-083134 of 24 November 2025, on a sample taken on 22 October 2025 by TZÚS and SGS. Percentages are by mass. The initial setting time may be at most twice that of the test cement (188 min in the November 2025 test). The contract and the certificate of analysis of each delivery are binding.

Producer

Partner — Rizhao Steel, Shandong, China
Manufacturer — Rizhao Jinghua New-Type Building Materials Co., Ltd., Rizhao City, Shandong Province, China, as named on the CE certificate and the test reports
Supplied by GFTx — packing, quantities, price and delivery terms are quoted on request

Safety & compliance

CE marking — certificate of constancy of performance No. 1020-CPR-040081372 by notified body 1020 (TZÚS) to EN 15167-1, system 1+
REACH — registered as slags, ferrous metal, blast furnace (EC 266-002-0, CAS 65996-69-2) through an EU only representative, valid until 31 December 2026

Applications

Ready-mix & site-mixed concrete

Precast concrete elements

Mortar & grout

Frequently asked questions

What is GGBFS S95 used for?+

It is a type II addition for concrete, including site-mixed concrete and precast elements, and for mortar and grout, as stated in its CE certificate. It replaces part of the cement in the mix.

Is the GGBFS CE-marked?+

Is the slag registered under REACH?+

Who produces the GGBFS?+

What do the test results show?+

Documents

Ground Granulated Blast Furnace Slag specificationPDF · 1 page · EN CE certificate of constancy of performancePDF · 1 page · TZÚS, notified body 1020 Test reports & REACH certificatePartners' area · password

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