AST HI-ACRYLIC Multi-Use Farm Sealants

AST Hi-Acrylic tapes from EMSEAL are the ideal solution for many sealing needs.

Engineered for the harsh open farm environment, they seal, separate, dampen vibration, insulate and isolate a wide range of joints, seams, pads, flanges and other conditions found in farm structures and machinery.

AST is a self-adhering tape seal made from resilient, open-cell foam impregnated with a water-based acrylic-modified asphalt emulsion. It replaces and outperforms liquid and butyl tape sealant and closed-cell closures.

impregnated with a water-based, acrylic-modified asphalt emulsion and then compressed to a sealing density level appropriate to the application. Typically, higher compression levels are required for water-tightness in water run-off applications; lower compression can be used, for example, for snow seals at roof ridges.

They are suitable for use against metal, plastic trim, and other materials common in metal building structures.

Benefits of AST
Will not dry out and become hard or brittle.

The seals are UV-stable and highly resistant to aging and vermin (bugs, rodents, birds, etc.)

Will not extrude from between joints when squeezed, which is a possibility with caulk or butyl-type tapes.

May be used in non-moving gasket-type applications as well as in moving expansion/contraction-type joints.

Material is supplied with self-adhesive on one side. After removal of packaging, material begins gradual expansion – more slowly in cold weather than in hot.

AST Sealant Tapes have been the sealants of choice of grain-bin manufacturers, metal roof and building component manufacturers, architects and engineers and discerning erectors for more than 30 years.

How it Works – The EMSEAL Advantage
The open-cell foam is impregnated, compressed to the size of the opening to be sealed, and shipped in reels. The stored strain-energy of compression in the foam means continuous back-pressure is exerted against surfaces to be sealed.

This pressure, combined with the adhesive nature of the impregnation, assures reliable adhesion to both upper and lower surfaces. As the sealed components and expand with seasonal temperature changes, long-term sealing contact with the contact surfaces is maintained.

Standard & Special Sizes Available
Please contact EMSEAL ( for sizes to suit your specific application needs.

To request an
containing a sample and literature, call

AST HI-ACRYLIC Multi-Use Farm Sealants

The following indicates levels of sealing at respective installed compression levels:

Emseal sealant tape compression and sealing level chart

AST Hi-Acrylic is by volume the most widely used. Black in color as the result of it’s advanced acrylic-modified asphaltic impregnation, AST affords economy without sacrificing performance.

MST features the latest in acrylic chemistry and is grey in color. Choice of MST over AST is really a preference of the user for color and chemistry.

1. Storage and Surface Preparation
Tape should be stored in a warm dry interior location. Ideal application temperature is approx. 75°F (24°C). Expansion will be faster at higher temperatures and slower at lower temperatures.
Tip: For faster expansion in cold conditions keep the material warm before use and, if desired, apply heat from a hair dryer to installed material to accelerate expansion. Joint faces should be dry and cleaned of dirt, oils, grease, etc. There should exist sufficient depth to receive full width of the sealant.

IMPORTANT: Reels must be stored FLAT and kept compact. Should material expand in package it can still be used. Unroll material, allow it to expand, then recompress it between surfaces to be sealed.

2. Opening Reels
Only open materials that will be immediately used. Remove shrink wrap.

Cut in front of colored marking tape and pull back release liner to expose mounting adhesive.

3. Square Off Ends
Start and finish ends must be cut square. For easier cutting spray knife or scissors with mist of water.

4. Peel Off Liner
Remove release liner to expose adhesive face of tape.

5. Adhere to Surfaces
Press adhesive face to one surface. Align other surface with tape. Secure surfaces together. Tip: If needed, cut and fit small filler pieces of tape to fill panel corrugation or voids.

6. Joining Lengths
Overlap one piece of tape with another. Cut through both pieces at a 45-degree angle with a long-bladed knife. Reposition mitered faces over each other and pinch them firmly together to make a join.

Available in many sizes.
If this tape size does not return the results you desire in your specific application, ask your vendor or Emseal for other size options.

Available for shipment internationally.
Prices are available directly from the manufacturer.
The product range is continually being updated, and accordingly EMSEAL® reserves the right to modify or withdraw any product without prior notice.

• Will not adhere to components that are dirty or dust covered or to surfaces coated with oils or other release agents.
• Will expand to follow and fill irregular substrates within reason. Sharp corners and acute angles may need to be filled with additional filler pieces  in order to ensure a proper seal.
• Substrate must be capable of resisting, without bending or deflection, approximately 1.5 to 2.5 lb/in2 (10 to 17 kPa) back pressure from the tape.