Product FAQs

Since 1978, Avanti International has been dedicated to helping the environment and “Supporting Green” not only by supplying the highest quality chemical grouts but also by educating contractors, municipalities, and engineers on the most cost-effective techniques used to protect the environment, increase the lifespan of buried infrastructure, and keep below-grade construction projects moving forward.

The purpose of this document is to answer questions relative to 3 distinct categories of Avanti products and provide factual information for the following:

Acrylic Grouts

Does acrylamide grout harm the environment?

Microorganisms in soil and natural waters assimilate unreacted acrylamide molecules. Additionally, dyes are frequently added to track the individual components during the injection process. In the event of a spill, the grout should be cured and disposed of, the site neutralized with potassium persulfate and sodium metabisulfite solutions, and then rinsed with water.

If over exposed, does acrylamide stay in the body?

Acrylamide does not build up in the body like lead. Once removed from exposure, acrylamide is excreted from the body as metabolites in the urine.

Is acrylamide toxic?

Pure acrylamide is considered a neurotoxin. Therefore when handling AV-100, a combination of acrylamide monomer (AM) and methylenebisacrylamide (MBA), proper PPE should be worn. However, it's important to note that acrylamide has a higher LD50 than everyday substances such as aspirin and caffeine.

In toxicology, the LD50 or median lethal dose of a substance, is the dose required to fatally affect 50 percent of the members of a test population after a specified test duration. The LD50  for a given substance is expressed as the mass of an administered substance per unit mass of test subject. For example: milligrams per kilogram of body weight. An LD50 of less than 5,000 is considered toxic; therefore, the lower the LD50 the more lethal the substance.

The table below presents the acute oral LD50 (rat) of acrylamide in comparison with other familiar substances.

 Substance LD50 (mg/kg)
 Unleaded Gasoline  18
 Caffeine  192
 Aspirin  200
 Acrylamide Liquid  528
 Table Salt  3,000

What is AV-100 grout?

AV-100 is a blend of acrylamide monomer (AM) and methylenebisacrylamide (MBA). AV-100 is injected as a two (2) component system, which has the same viscosity as water and changes from a liquid to a solid, firm gel in a controllable time frame ranging from 5 seconds to 10+ hours. AV-100 is a true solution grout (has no suspended solids) and is designed to be injected underground to control or stop the flow of groundwater.

How fast does acrylamide (AV-100) grout cure?

The reaction time is controllable from 5 seconds to 10+ hours.

Is safety training available?

Since 1978, Avanti has offered a Safe Operating Practices Program for contractors who store and use the AV-100 components.

Is there any health or environmental risk associated with the cured AV-100?

Once AV-100 has cured, the gel is inert, non-toxic, stable, and irreversible.

Is acrylamide classified as a carcinogen?

No. According to the International Agency on Research for Cancer, IARC, acrylamide is listed under category “Group 2A: Probably Carcinogenic to Humans.” Other known substances listed under the same category consist of diesel engine exhaust, emissions from high temperature frying, and emissions of burning wood to name a few.

Is acrylamide found elsewhere?

Acrylamide is in our everyday diet. According to the Food and Drug Administration, acrylamide is a chemical that can form in some foods during high temperature cooking processes, such as frying, roasting and baking. Acrylamide in food forms from sugars and an amino acid (asparagine) that is naturally present in foods.

Is the cured AV-100 grout biodegradable?

AV-100 is designed as a long-term solution. Studies conducted by the US Department of Energy indicate that the half-life in the soil of properly applied AV-100 is 362 years.

Was the use of acrylamide chemical grout ever banned in the U.S.?

The use of acrylamide grout has never been banned. In a notice dated December 2, 2002, the EPA announced the withdrawal of a proposal that would have banned grouts containing acrylamide and the acrylamide derivative N-methyloacrylamide (NMA). After being educated on the safety and benefits of these products the EPA withdrew the proposal with the knowledge that specific worker safety training was available. Avanti continues to offer Safe Operating Practices and Procedures (SOPP) training to ensure that those handling the products know how to handle them safely.

How long has acrylamide grout been in use?

Acrylamide has been used in the construction and rehabilitation industry for over 60 years. Its first use in the U.S. was in the 1950’s for soil stabilization.

Where is acrylamide grout used?

AV-100 Chemical Grout was Avanti’s first product and remains the product of choice for many owners and contractors for the control of groundwater, hazardous waste encapsulation and the sealing of entire sewer systems, underground transit systems, mine shafts and tunnels. The product can be injected via remote packer, tube-a-manchette, probe, hand-held injection wand, or F-assembly.

What additional components are required to cure acrylamide (AV-100) grout?

In addition to the AV-100 grout, AV-101 Catalyst T+ (triethanolamine) and AV-102 Catalyst AP (ammonium persulfate) are required. AV-101 Catalyst T+ is an organic chemical compound used as an activator for the grout; AV-102 Catalyst AP is the initiator which triggers the reaction.

What is the difference between acrylamide, acrylic, and acrylate chemical grouts?

These 3 types of grouts make up an acrylic family of resins.Each is used to control groundwater and each has varying cured gel strength. Acrylamide grout like AV-100 is the cornerstone of the industry and has been used in the U.S. since the 1950’s. Acrylic grouts like AV-118 have less acrylamide in them and have been used since the early 1990’s in the U.S. Acrylates like AV-160 have been available since the 1970’s-1980’s but have only recently gained acceptance in some markets. Acrylates contain no acrylamide and are more expensive than other acrylics. AV-160 creates quite a strong gel but many acrylates on the market create very weak gels.

CONCLUSION

While proper care and precautions are necessary when handling any chemical grout, these products are safely and successfully used throughout the world every day. If you have questions or need further information please feel free to contact Avanti International directly at 800-877-2570.