Table of Contents
Overview
KnuKonceptz Kno Knoise XT 120mil (3mm) 1.2lb/Sq Ft Butyl Sound Deadener Vibration Dampening Sheets – Car Door Pack 13.2 Sq Ft is a constrained layer dampener designed to reduce resonant noise in panels by stopping vibrations that generate noise. It uses butyl rubber sandwiched between constraining layers, with an outer aluminum backing that reinforces the panel and reduces vibrations and rattles.
This material adheres directly to panels in applications such as car audio systems, classic automobiles, HVAC ducts, computer cases, and kitchen sinks. It is configured as a car door pack totaling 13.2 square feet, available here: butyl sound deadener sheets.
Key takeaways
- This is a 120mil (3.0mm) butyl rubber vibration constrained layer dampener with a 12mil aluminum constraining layer.
- The material weighs 1.21 pounds per square foot and is described as heavy and efficient due to its mass per square foot.
- It is designed to reduce resonant noise by reinforcing panels and stopping vibrations that generate noise.
- The pack includes 10 sheets measuring 18.11 inches by 10.51 inches, totaling 13.2 square feet.
- It meets FMVSS 302 standards for flammability and lists a maximum temperature range of -50F to 350F.
What the product is designed to do
This constrained layer dampener adheres to a panel to reduce resonant noise using a viscoelastic polymer, in this case butyl rubber, sandwiched between two constraining walls. The outer aluminum backing reinforces the panel and reduces vibrations and rattles. It deadens the panel it is attached to by stopping the vibrations that generate noise.
Recommended uses include car audio, classic automobiles, HVAC ducts, computer cases, and kitchen sinks. The constrained layer dampener sheets are intended for installation directly onto panels where vibration control is required.
Materials, dimensions, and technical details
| Specification | Detail |
|---|---|
| Dampening Material | Butyl Rubber |
| Total Thickness | 120mil (3.0mm) |
| Overall Thickness | 3.3mm |
| Foil Thickness | 12mil |
| Weight | 1.21 lb per square foot |
| Sheet Size | 18.11" x 10.51" (1.32 sq ft per sheet) |
| Total Coverage | 13.2 sq ft (10 sheets) |
| Maximum Temperature Range | -50F to 350F |
| Operating Temperature Range | 10F to 130F |
| Flammability Standard | Meets FMVSS 302 |
The vibration dampening sheets use a thick aluminum top constraining layer described as rigid and thicker than similar materials.
Installation and placement notes
Installation is described as cut, peel, and stick. The material should be installed on a clean, dry panel, and no solvents are required. The butyl rubber is self-adhering; the backing is removed and the material is placed onto the panel.
It can be cut with a utility knife, scissors, or tin snips. Applying firm pressure with the hand is described as sufficient, and the use of a flat wood roller is optional. Reviews commonly mention that gloves may be required due to the sharp metal layer and that a heat gun, roller, or relief cuts may be needed when working with curved panels. The butyl vibration dampener is described as thick and rigid.
Performance characteristics described in the listing
The material is described as rigid, with a 12mil aluminum constraining layer intended to stop vibrations rather than flex with the panel. A thicker constraining layer is described as more effective than a thinner, softer material. The added mass of 1.21 pounds per square foot is described as requiring more energy to create vibrations in a panel.
The 3mm thick viscoelastic butyl layer is described as dispersing energy while adding mass. This mass to area ratio is described as contributing to efficiency in vibration control.
Review patterns buyers commonly mention
Across top reviews, buyers commonly mention the thickness and rigidity of the aluminum layer. The material is described as substantial and heavier per square foot compared to some other 120 mil constrained layer dampeners. Reviewers also frequently note that the product requires careful handling due to sharp edges and may require additional tools such as a heat gun or roller for curved panels.
Adhesion quality and overall material thickness are recurring themes in reviews, along with comments about the amount of work required during installation.
Pros
- 120mil (3.0mm) butyl rubber with a 12mil aluminum constraining layer.
- 1.21 pounds per square foot for increased mass.
- Meets FMVSS 302 flammability standards.
- Self-adhering and can be cut with common tools.
- Described in reviews as thick, rigid, and substantial.
Cons
- Rigid aluminum layer may not conform easily to contoured panels.
- Metal layer described as sharp, requiring gloves.
- Installation on curved surfaces may require a heat gun, roller, or relief cuts.
FAQ
How do you install these vibration dampening sheets?
The material is installed by cutting to size, peeling the backing, and sticking it to a clean, dry panel. No solvents are required, and firm hand pressure is described as sufficient, with a roller optional.
What are these sheets made of?
They are made of butyl rubber with a 12mil aluminum constraining layer.
What temperature range does this material support?
The maximum temperature range is -50F to 350F, with an operating temperature range of 10F to 130F.
How thick are the sheets?
The total thickness is 120mil (3.0mm), with an overall thickness of 3.3mm including the aluminum layer.
How much coverage is included in the car door pack?
The pack includes 10 sheets measuring 18.11 inches by 10.51 inches each, totaling 13.2 square feet of coverage.