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Armacell AF/ArmaFlex Self-Adhesive Sheet vs LK Lab Self-Adhesive Foam Sheets

Buy the Armacell AF/ArmaFlex sheet for duct, pipe and mechanical insulation where condensation control, fire rating and a known thermal conductivity matter. Buy the LK Lab pads for small anti-vibration and anti-slip jobs under furniture, appliances and craft projects. The Armacell is a certified insulation product with a B-s3,d0 fire class and a water vapour diffusion factor above 10,000; the LK Lab is an uncertified neoprene pad sold in four small pieces. Owners of the Armacell sheets praise the self-adhesive backing and clean cuts; LK Lab buyers get a cheap, soft pad with no published thermal or fire data.

  • Choose the Armacell AF/ArmaFlex sheet if you are insulating ducts, large pipes or mechanical surfaces and need condensation control, a fire rating and a stated R-value.
  • Choose the LK Lab foam pads if you need small self-adhesive pads to stop furniture, appliances or craft parts from slipping or rattling.

Prices

  • Armacell AF/ArmaFlex Self-Adhesive Sheet: $188.65 at DK Hardware (last seen Nov 10)
  • LK Lab Self-Adhesive Foam Sheets: $23.99 at Walmart (last seen Nov 11)
  • Difference: the LK Lab Self-Adhesive Foam Sheets is $164.66 cheaper than the Armacell AF/ArmaFlex Self-Adhesive Sheet at the latest prices (Nov 10 and Nov 11)
Armacell
AF/ArmaFlex Self-Adhesive Sheets - Flexible Elastomeric Foam Insulation

Armacell AF/ArmaFlex Self-Adhesive Sheet

AF/ArmaFlex Self-Adhesive Sheets - Flexible Elastomeric Foam Insulation

$188.65at DK HardwareChecked Nov 10
See all prices and details
Visit DK Hardware
Pros
  • Declared fire class B-s3,d0
  • Low thermal conductivity of 0.033 W/(m·K)
  • High water vapour resistance (μ > 10,000) controls condensation
  • Wide service range of -50 to 110 °C
  • Self-adhesive backing speeds installation on ducts and pipes
Cons
  • Sold in large cartons, more than a small job needs
  • 10 mm thickness limits use where space is tight
  • Black finish is visible on exposed runs
  • Not a finished plasterboard product
LK Lab
LK Lab 4 Pcs Foam Sheets Self Adhesive, 3/4 in Thick X 12 in X 8 in Closed Cell Foam Pad Neoprene Rubber Sheets Non-Slip Insulation Pads Vibration for Furniture Crafts Cars

LK Lab Self-Adhesive Foam Sheets

LK Lab 4 Pcs Foam Sheets Self Adhesive, 3/4 in Thick X 12 in X 8 in Closed Cell Foam Pad Neoprene Rubber Sheets Non-Slip Insulation Pads Vibration for Furniture Crafts Cars

$23.99at WalmartChecked Nov 11
See all prices and details
Visit Walmart
Pros
  • Four pads per pack in a handy 12 x 8 in size
  • 3/4 in thickness absorbs vibration well
  • Self-adhesive backing holds pads in place
  • Cuts easily with scissors for craft and furniture use
Cons
  • No fire rating, thermal conductivity or temperature data
  • Small pads, not suited to duct or pipe insulation
  • Neoprene can harden and compress over time
  • Color is listed only as 'Other'

What separates them

Armacell AF/ArmaFlex Self-Adhesive SheetLK Lab Self-Adhesive Foam Sheets
Product typeFlexible elastomeric foam sheet insulation (NBR)Closed-cell neoprene rubber pad
Fire ratingB-s3,d0 declaredNot declared
Thermal conductivityλd ≤ 0.033 W/(m·K)Not published
Temperature range-50 to 110 °C (-297 to 220 °F)Not published
Water vapour resistanceμ > 10,000Closed cell, no μ figure given
Sheet size2000 x 500 mm, 10 mm thick, 13 m² per carton12 x 8 in, 3/4 in thick, 4 pieces
Adhesive backingSelf-adhesiveSelf-adhesive
Best useDucts, large pipes, acoustic and thermal insulationAnti-slip and vibration pads for furniture, appliances, crafts

Price history

$734.99$188.65
Nov 4Nov 11
  • Armacell AF/ArmaFlex Self-Adhesive Sheet: lowest $188.65 on Nov 9 at DK Hardware; $188.65 on Nov 11.

Prices at every store

Armacell AF/ArmaFlex Self-Adhesive Sheet

  • DK HardwareNew

    In stock

    $188.65+ $33.00 shippingChecked Nov 10
    Visit DK Hardware
  • ZoroNew

    In stock

    $734.99Free shippingChecked Nov 10
    Visit Zoro
All 2 stores and price history →

LK Lab Self-Adhesive Foam Sheets

  • WalmartNew

    In stockSold by Wei2026Returns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $23.99Free shippingChecked Nov 11
    Visit Walmart
Prices and history →

Specs compared

SpecArmacell AF/ArmaFlex Self-Adhesive SheetLK Lab Self-Adhesive Foam Sheets
Material typeFlexible elastomeric foam based on synthetic ru…—
Product colourBlack—
Service temperature min-50—
Service temperature max110—
Thermal conductivityλd ≤ [W/(m·K)] 0,033—
Reaction to fireSheets: B-s3,d0—
Water vapour diffusion factorSheets [3 mm - 32 mm]: μ > 10,000—
Structure-borne sound reduction< 28 dB (A)—
Sheet length2000 mm—
Sheet width500 mm—
Sheet thickness10 mm—
Coverage13 m²—
Show all 40 specsShow fewer specs
SpecArmacell AF/ArmaFlex Self-Adhesive SheetLK Lab Self-Adhesive Foam Sheets
FormSheet—
Product TypeSheet Insulation, Armaflex Sheet—
Insulation TypeAcoustic—
Insulated PlasterboardNo—
Material CompositionNitrile/PVC—
Moisture ResistanceMoisture-resistant—
ApplicationAcoustical Absorption, Sound Control—
Suitable SurfacesVariety of mechanical surfaces, Ducts, Large pi…—
Coverage Area144 Square Feet (Per Carton)—

What reviewers say

Armacell AF/ArmaFlex Self-Adhesive Sheet

Owners of ArmaFlex sheet insulation generally report that it cuts cleanly, sticks well on clean metal and controls condensation on ducts and chilled lines. Complaints center on adhesive strength on dusty or damp surfaces and on the modest R-value of the 10 mm sheet.

What people mention
  • AdhesionMixedSticks firmly on clean, dry metal but can peel where surfaces are dusty or damp.
  • Moisture controlPraisedClosed-cell foam stops condensation sweating on chilled pipes and ducts.
  • Thermal valueCriticisedThe 10 mm sheet's R4.2 is modest, so colder jobs need thicker layers.
  • Cutting and fitPraisedCuts cleanly and flexes around curves and irregular mechanical surfaces.

Questions and answers

Which is better for insulating ducts and pipes?
The Armacell AF/ArmaFlex sheet. It is made for ducts, large pipes and mechanical surfaces, with a declared thermal conductivity, a fire class and high water vapour resistance. The LK Lab pads are too small and carry no insulation data.
Which lasts longer?
The Armacell sheet is built as a long-life insulation material with a -50 to 110 °C service range and moisture resistance. Neoprene pads like the LK Lab compress and can harden with age, so they suit light, replaceable jobs.
Can I use the LK Lab pads for pipe insulation?
Only for small, low-demand wraps. The pads are 12 x 8 in and 3/4 in thick with no published thermal or fire rating, so they do not replace a proper elastomeric sheet on pipes or ducts.
Is the Armacell sheet worth stepping up to?
Yes if the job involves condensation, fire code or heat loss on ducts and pipes. For stopping a chair or washing machine from sliding, the LK Lab pads do the job with far less material.
Do both have self-adhesive backing?
Yes. Both the Armacell sheet and the LK Lab pads are self-adhesive, so each sticks to a clean surface without separate glue.
Which is better for sound control?
The Armacell sheet is specified for acoustic absorption and sound control on ducts and large surfaces. The LK Lab pads mainly damp vibration under furniture and appliances rather than absorb room sound.

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Thickness
1 inch
—
Length48 in—
Width36 in—
Diameter36 inches (Inside Diameter)—
Pipe Size36 ID—
R-ValueR4.2—
Operating Temp Range-297 to 220 degrees F—
Sound AbsorptionYes—
Temperature Range-297 to 220 degrees F—
Vapor Permeability0.05 perm-in—
Max Service Temp220 degrees F—
Min Service Temp-297 degrees F—
Permeance0.05 perm-in (Water Vapor Permeability)—
Insulation MaterialPolyethylene—
Wall Thickness1 in—
color—Other
actual_color—4
theme—12" x 8" x 3/4"
size—3/4 in x 12 in x 8 in