DE NEEF® Gelacryl Superflex Data Sheet

Methacrylic Acrylate Copolymer

Product Description

DE NEEF® Gelacryl Superflex is a unique blend of methacrylic acrylate copolymers, combining the low viscosity of traditional acrylate resins with the elongation and adhesion typically associated with polyurethane resins. Its low viscosity makes it ideal for injection into pores, capillaries, hairline cracks, and honeycombed concrete. DE NEEF® Gelacryl Superflex’s low surface tension also make it suitable for penetration into soils, making it an excellent choice for curtain wall grouting. Pumped at 1:1, it polymerizes to form a resilient, highly elastomeric gel with elongation > 300%. 

Product Advantages

  • Exceptionally low viscosity – penetrates cracks 0.1mm (0.004”). 
  • Post reaction expansion of up to 56% 
  • ANSI/NSF 61 Certified for use with potable water
  • Non-corrosive and non-toxic 
  • Insoluble in water and petroleum based solvents once cured. 
  • Resistant to most acids and alkalis 
  • Excellent thermal resistance between 40ºF - 160ºF 
  • Reaction time can be controlled 

Product Applications

DE NEEF® Gelacryl Superflex is designed for use in any below ground structure or any water retaining structure where there is permanent moisture. Especially well-suited for:

  • Hairline and spider cracks in concrete
  • Re-injection of failed polyurethane grout 
  • Expansion & moving joints
  • Honeycombed concrete
  • Curtain grouting
  • Potable water applications

Installation Guidelines


In a clean pail, pour desired amount of DE NEEF® Gelacryl Superflex and add TE 300 in accordance with the Mix Ratio table provided to achieve the desired set time. Mix well. In a separate clean pail, pour clean water of equal quantity to the amount of DE NEEF® Gelacryl Superflex previously poured. Add SP 200 in accordance with Mix Ratio Table and mix well. If extended set times are required, KF 500 (retarder) can be added to the resin side; please consult DE NEEF® Technical Service.


DE NEEF® Gelacryl Superflex is pumped at 1:1 through a pump with all stainless steel wetted components. Always begin at the lowest pressure setting available on the pump and increase to the minimum pressure required to get desired resin flow.

Crack Injection: 

For concrete crack injection applications consult DE NEEF® Standard Crack Injection Procedures. Due to the ultra-low viscosity of the DE NEEF® Gelacryl Superflex resin, larger cracks may require application of a surface seal such as hydraulic cement or epoxy.

Curtain Wall grouting: 

For curtain grouting applications consult DE NEEF® Standard Curtain Grouting Procedures. Adjust set time to allow for permeation through soils surrounding the structure.

Confirm product performance in specific chemical environment prior to use.

Mix Ratios

Reactivity T° (F) DE NEEF® Superflex (gal)  TE300 (oz) % TE300 Water (gal) SP200 (oz) % SP200 Gel Time (min)
33 5.6 35 4.6 5.6 40 5.35 2
33 5.6 30 3.94 5.6 28 3.74 3
40 5.6 35 4.6 5.6 40 5.35 1
40 5.6 28 3.68 5.6 28 3.74 2
40 5.6 25 3.28 5.6 20 2.67 3
50 5.6 30 3.94 5.6 32 4.28 1
50 5.6 20 2.63 5.6 20 2.67 2
50 5.6 15 1.97 5.6 16 2.14 3
60 5.6 20 1.58 5.6 20 2.67 1
60 5.6 15 1.97 5.6 12 1.6 2
60 5.6 12 1.58 5.6 10 1.34 3
70 5.6 15 1.31 5.6 16 2.14 1
70 5.6 12 1.58 5.6 10 1.34 2
70 5.6 10 1.31 5.6 8 1.07 3
80 5.6 12 1.58 5.6 12 1.6 1
80 5.6 10 1.31 5.6 9 1.2 2
80 5.6 8 1.05 5.6 8 1.07 3

DE NEEF® Superflex is designed for use below ground or where there is permanent moisture. Gel time varies depending on the amount of acceleration and temperature. See chart above for time and temperature information. For concentrations above 3%, use TE-300 at 3% and increase SP-200 only. Adding excessive amounts of TE-300 can adversely affect the quality of the reacted gel. (All results above are based on 77ºF. Site trials should always be carried out to determine the gel time required.


Packaging & Handling

DE NEEF® Gelacryl Superflex is packaged as a kit consisting of a of 5.6 gallons of grout (55/lb jerrican), 2 lbs. jar of SP 200 initiator*, and 28 oz. can of TE 300 activator.

*SP 200 is an oxidizer and ships as a hazardous material.

All components should be stored in a dry place at temperatures between 40°F and 80°F. Do not thin with solvents.

Warning! Do not let SP 200 and TE 300 come into contact with each other prior to field mixing. A poisonous gas may result! STORE COMPONENTS SEPARATELY FROM EACH OTHER.


Low temperatures will significantly elongate set times. For best results, bring product to a minimum temperature 50°F for a minimum period of 24 hours prior to use. If site temperatures are extremely low, material should be held in a warm area before and during use to maintain the products temperature. Allow no water into open containers. Do not apply when ice is present. DO NOT EXCEED 90ºF WHEN WARMING.


  • Water used to activate grouts (“B” side of mix) must be in a range of pH 5.5 – 7 for optimum grout quality.
  • Varying water pH will cause the reaction times to change. 
  • Groundwater should be in the range of pH 3-12.

Health and Safety

Users must read and understand the product label and safety data sheet (SDS) for each system component before use. All users should acquaint themselves with this information prior to working with the material. Carefully read detailed precaution statements on the product label and SDSs before use. The most current SDSs can be obtained from the GCP website at or by contacting GCP toll free at 1-866 333-3726.

Always use protective clothing, gloves and goggles consistent with OSHA regulations during use. Avoid eye and skin contact. Do not ingest. Refer to Safety Data Sheet for detailed safety precautions.


Viscosity at 77ºF 15-20 cps
Mixed Viscosity 6-8 cps
Appearance  Blue Green
Specific Gravity 1.17
Elongation at Break 300% (ASTM 638)
Post Reaction Expansion 150% in contact with water
Permeability at 29 psi 3.53 x 10-9 cm/s

Note: The data shown above reflects typical results based on laboratory testing under controlled conditions. Reasonable variations from the data shown above may result. | North America Customer Service: +1 (877) 423 6491

We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate, and is offered for consideration, investigation and verification by the user, but we do not warrant the results to be obtained. Please read all statements, recommendations, and suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement, recommendation, or suggestion is intended for any use that would infringe any patent, copyright, or other third party right.

DE NEEF is a trademark, which may be registered in the United States and/or other countries, of GCP Applied Technologies Inc. This trademark list has been compiled using available published information as of the publication date and may not accurately reflect current trademark ownership or status.

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GCP Canada, Inc., 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6
This document is only current as of the last updated date stated below and is valid only for use in the United States. It is important that you always refer to the currently available information at the URL below to provide the most current product information at the time of use. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. If there are any conflicts or if you need more information, please contact GCP Customer Service.

Last Updated: 2023-10-02