SILRES^® BS 1701

The work performed (preparing the concrete surface, setting up a reference surface, application and quality control) must follow the applicable regulations (in Germany these are the DAfStb repair work guidelines and the ZTV-ING).

- Concrete should not be impregnated until at least four weeks after it has been produced so that the setting of the cement is not affected.

- New surfaces that are still unsoiled must be cleansed of coarse particles and dust deposits by sweeping or, if necessary, using compressed air. Surfaces already weathered, and those heavily soiled by oil, rubber residue, etc., must first be cleaned using superheated steam or high-pressure water before commencing treatment. It is imperative that the water used be siphoned off immediately to prevent saturation of the concrete.

- Impregnation should always be performed on superficially dry concrete, i.e., when the surface of the concrete appears evenly dry, no more damp patches are visible and the moisture content equilibrium is established. To this end, moisture in the surface zone of the concrete is measured using a suitable technique (CM method or other methods allowed under ZTV-ING). The surface-zone moisture content of the concrete (from the surface to a depth of 20 mm) should not exceed 4 wt%.

- Evenly apply the impregnating agent to the building material in several coats, wet-on-wet. Do not allow puddles to form. The impregnating agent is applied by flow coating at reduced pressure. A lambskin roller may be used afterward for more even coverage.

- In the event of unexpected rain, cover surfaces already impregnated and halt all further impregnation.

- SILRES^® BS 1701 should never come in direct contact with bitumen. The resistance of insulating materials to SILRES^® BS 1701 must be tested on a case-by-case basis for the required temperatures.


SILRES^® BS 1701 is recommended for the hydrophobic impregnation and priming of concrete and reinforced concrete in road, bridge and building construction. In addition it is suitable for the hydrophobic treatment of fillers and pigments.

Expert opinions:

The effectiveness of SILRES® BS 1701 is confirmed
and documented in the following laboratory reports:

• Polymer Institut Dr. Stenner GmbH, Flörsheim,
  Germany
  Test report P 5024-1, May 14, 2007; EN 1504-2
  Test report No. P 1637, Nov. 6, 1998; TL/TP OS (1996 issue) of ZTV-SIB 90
• CBI Betonginstitutet AB, Boras, Sweden
  Test report No. 2297156 A, Sept. 6, 1996; BRO 94
  Test report No. P701959 B, Oct. 19, 2007; BRO 2004
  Test report No. FX00045B, Jan. 27, 2011; VVAMA
  Anläggning 09 rev. 2
  Test report No. 6P00354 B, NT BUILD 515
• VTT Technical Research Center of Finland, Helsinki, Finland
  Test report VTT-R-42523-11, Apr. 6, 2011; SILKO 2010
• TRL Ltd., Berkshire, UK
  Report PR/CSS/34/03, Aug. 2003; BD43/03
  Report PPR 362, Oct. 2009; BD 43/03
• CTL, Ltd, Skokie, Illinois, USA
  Project No. 406945; Jan. 5, 2004; AASHTO T259/T260
  Project No. 406945; Aug. 8, 2003; ASTM C 672-98
  Project No. 406945; June 23, 2003; ASTM E 514-92
• AMEC Earth & Environmental, Edmonton, Canada Project No. EA 15621; 
  Dec. 12, 2005; BT-001