Frequently Asked Questions

Product Removal

Wash with warm water. Gently remove any large clumps of Ten20 from hair by combing out and then immediately rinsing with warm water.

Do NOT rub your eye. Immediately rinse eyes in hot shower to melt the Ten20. If irritation persists, please see your doctor.

Scrape off any clumps and then wash the clothes in very warm water.

Product Ingredients

No, Nuprep and Ten20, including the containers and packaging, do not contain any Latex. Please see our Latex Statement.

None of these items, including their by-products, can be found in Weaver and Company products. Please see our Material-Free Statement.

Ingredients can be found on all jars and tubes, on the instruction sheets, and on the MSDS’s.

Product Purchasing

Yes, please see New Customer information. Products can only be purchased by hospitals, distributors, and other medical offices/labs.

Most orders are shipped via ground delivery and should arrive with 3-5 business days within the United States.

Weaver and Company currently accepts checks, ACH, and wire transfers.

At this time we have no plans to pass this tax on to our customers and we will absorb the cost. However, we reserve the right to change this decision in the future.

Product Storage and Packaging

All Weaver and Company products have a 3-year shelf-life. Please click here for more information on determining the expiration date of your products.

Ten20 and Nuprep should be stored at room temperature and away from any locations subject to sudden temperature changes.

Short exposure to environmental extremes are possible and in some months, likely. Documented reports of product quality changes have occurred with Ten20 and these occurrences seem to be due to exposure to cold for a period of time. The adhesive quality of Ten20 is reduced, the conductivity characteristics are often reduced, and there is a physical appearance of small white concentrations of material through the paste. It is easily re-mixed, however product does not come back to expected quality. No known health risk to the patient or operator occurs. There have been no reports of product quality changes with Nuprep.

Ten20 can be purchased in 3-pack boxes of 4oz tubes, 4oz jars, and 8oz jars. Nuprep can be purchased in 3-pack boxes of 4oz tubes and 6-pack boxes of 25g tubes.

The lot number and expiration date are printed or stamped on every product container. Please click here for additional information on how to read lot numbers and expiration dates.

Product Usage

Yes, the instruction sheets are translated into multiple languages.

Apply Nuprep gel to electrode site on scalp with cotton swab. Rub lightly. Do NOT over-abrade the skin. Refer to the Nuprep Instruction Sheets for additional information.

Apply Nuprep gel to electrode site with gauze pad. Rub lightly into skin. Remove excess with clean gauze pad. Do NOT over-abrade the skin. Refer to the Nuprep Instruction Sheets for additional information.

Place a small amount of paste on a clean surface such as a strip of surgical tape. Please just enough paste inside the electrode to slightly overfill it. Place electrode onto site and press firmly. Wipe off excess paste. Refer to the Ten20 Instruction Sheets for additional information.

As long as the product is stored properly, it is good for the entire 3-year shelf-life. Please read this statement for more information.


Yes, Weaver and Company is certified to the ISO 13485:2016 standard. Please click here for a copy of our ISO Certificate.

Yes, Ten20 and Nuprep are CE-marked products. Please click here for the current EU Declaration of Conformity, available in multiple languages.