DE NEEF® AC-400 Acrylate Chemical Grout Resin Data Sheet

Product Description

DE NEEF® AC-400 chemical grout is a non-acrylamide acrylate monomer sealant designed for water control during tunnelling operations, for curtain grouting, and for excavatable soil consolidation in situations where low tensile and compressive strengths can be tolerated. AC-400 can also be used for controlling infiltration in mainline and lateral sewer joints. 

Product Advantages

  • Non-acrylamide technology
  • Pumps without modification to existing grouting acrylate / acrylamide equipment
  • Extremely low viscosity grout (1-3 cPs)
  • Very low permeability (5x10-9 cm/sec)
  • Provided in liquid form (40% solids)
  • No acrylamide powder batch mixing on jobsite
  • Not flammable or explosive


  • Water control in tunnelling
  • Curtain grouting
  • Soil support for excavation
  • Mainline and lateral sewer grouting
  • Geo-technical grouting

Installation Guidelines

Warning: Consult the technical data sheets and safety data sheets before using.

A chemical grout will result from mixing the following components:

GROUT TANK DE NEEF® AC-400, water and TE-300
SP TANK Water and SP-200

When these components are properly mixed and brought together, the resulting chemical grout will form an impermeable, durable gel. The DE NEEF® AC-400 chemical grout has a variable gel time from 5 seconds to 1 hour to handle most sealing conditions. 

Mixing Instructions

GROUT TANK should first be filled with 12 gallons water, then 15 gallons (3 drums) of DE NEEF® AC-400 grout should be added. Add TE-300 and mix well.

SP TANK should be filled with 27.5 gallons water, then add SP-200 and mix well.


For geo-technical grouting applications:
The following typical formulation may be used in the field at 15º C (59º F) to give approximately 30 minutes gel time:

  WT% Pounds Gallons
Water 19 100 12
DE NEEF® AC-400 30 147 15.0
TE-300 0.5 7 0.75
KF-500 0.5 2.5 0.29
Water 49.5 230 27.5
SP-200 0.5 5  
Total 100 491.5 55.5

KF-500 is a retarder for DE NEEF® AC-400 grouting applications. It is packaged as 4 oz. of potassium ferricyanide powder, which should be diluted with 36 ounces water to make a 10% solution. The solution as mixed provides 0.5% KF-500 as shown above. 

Other formulations are available for extended gel times. Contact DE NEEF® Technical Services.

For sewer sealing and curtain grouting applications:

The following typical formulation may be used in the field at 15ºC (59ºF) to give approximately 60 seconds gel time:

  WT% Pounds Gallons
Water 19 100 12
DE NEEF® AC-400 30 147 15.0
TE 300 0.5 7 0.75
Water 49.5 230 27.5
SP-200 0.5 5  
Total 100 489.0 55.25

The following typical formulation may be used in the field at 15ºC (59ºF) to give approximately 20 seconds gel time:

  WT% Pounds Gallons
Water 19 100 12
DE NEEF® AC-400 30 147 15.0
TE-300 0.5 9.26 1.0
Water 49.5 230 27.5
SP-200 0.5 5  
Total 100 496.25 55.5

Set times will vary depending on temperature and humidity. Always preform a cup test to determine the actual gel time of each mixed batch. Additional SP-200 may be added to shorten the gel time. If grout is left in tank overnight, always perform a new cup test before beginning next day’s grouting.

Packaging & Handling

DE NEEF® AC-400 Grout is used with SP-200 (sodium persulfate) and TE-300 (triethanolamine). Available in 5 gallon drums (49 lbs). TE-300 and SP-200 are sold in several sizes.


Workers handling the grout must wear rubber gloves, goggles, and waterproof shoes. If the grout comes in contact with the skin, it should be washed off immediately with water. The grouting truck must be ventilated when mixing DE NEEF® AC-400 grout. Avoid breathing of the grout vapor. Use a blower and flexible duct to ventilate the bottom of manholes being grouted. Follow confined space entry and work procedures as required.

  • Do not let SP-200 and TE-300 come into contact with each other prior to field mixing. The reaction is exothermic (heat producing) and may cause fire.
  • Store SP-200 and TE-300 separated from each other, at 40⁰ F-80⁰ F.
  • TE-300 and SP-200 are incompatible with aluminum. Do not use aluminum equipment in the presence of TE-300 and SP-200.
  • Prolonged exposure to UV, sunlight, and elevated temperatures above 85ºF will cause solidification of the product.

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.


This product is not intended to fill large void spaces.


DE NEEF® AC-400 acrylate resin
Appearance Straw yellow liquid
Density 9.8 lbs/gal
Percent solids 39 – 41%
Specific gravity 1.2
Boiling point 200 °F (93°C)
Solubility in water 100%
Toxicity Very low toxicity (not certification program required)
DE NEEF® AC-400 solution
Viscosity 1 – 3 cPs
Density 8.6 lbs/gal (1.04 mg/ml)
pH 6.5 – 7.5
DE NEEF® AC-400 cured
Appearance White flexible gel
Solubility Insoluble in water, kerosene, gasoline, Gel swells slightly in presence of water
Permeability Substantially impermeable to water (5x10-9 cm/sec) Stable in 100% humidity. Can dehydrate in dry conditions.
Chemical resistance Resistant against bacteria, fungi, and chemicals found in sewer systems

Note: The data shown above reflects typical results based on laboratory testing and 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.

© Copyright 2018 GCP Applied Technologies Inc. All rights reserved.

GCP Applied Technologies Inc., 2325 Lakeview Parkway, Suite 400, Alpharetta, GA 30009, USA
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: 2023-06-28