3M Fire Barrier Moldable Putty Pads MPP+, 7 in x 7 in, Pack of 20

Pack: 3M Fire Barrier Moldable Putty Pads MPP+ are hand-formable, ready-to-use firestop material for openings and penetrations in fire-rated assemblies. The listing claims firestop testing up to four hours under specified standards, while the pads' pliability and re-enterable design suit installations that may need later access.

At a glance

One-part intumescent putty is described as ready to use and re-enterable.
Designed for fire-rated wall openings and through penetrations, including electrical-box protection.
Pliable material can be formed by hand without mixing or tools.
Listing states it provides a draft and cold-smoke seal.

Price

$149.24Save 21%

Reference price: ~~$189.98~~

Price checked: Nov 14, 2026

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Often bought together

3M CP-25WB+/10.1 10.1 Oz. Fire Barrier Sealant (Pack of 1) | One-Component, Gun-Grade, Latex-Based, Intumescent Material

$35.74

Pros and cons

Pros

Hand-formable pads can be shaped around openings and penetrations without mixing or installation tools.
Re-enterable material is described as suitable where later access may be needed.
The listing specifies firestop testing up to four hours under named standards and wall-opening testing up to two hours under UL 263.

Technical specifications

8 specifications

Identity
Brand	3M

Dimensions and installation
Dimensions listed	33.02 x 27.94 x 15.24 cm; 2.7 kg
Weight listed	2.7 kg
Pad size	7 in x 7 in
Pad thickness	1/10” (2.54 mm)
Application	Applied by hand, with no mixing or tools

Firestop claims
Firestop testing	Fire stop tested up to 4 hours in accordance with ASTM E 814 (UL 1479) & CAN/ULC S115
Wall-opening protection testing	Wall opening protective material tested up to 2 hours in accordance with UL 263

What to know before buying

The title specifies a pack of 20, but the product details separately state an item package quantity of 1. Confirm the selected listing's supplied pad count before ordering. The stated fire-resistance durations apply to testing under the cited standards and are not a blanket guarantee for every assembly or installation.

Who is it for?

A good fit for

Installers protecting listed electrical boxes in fire-rated wall assemblies.
Firestop work involving cable, conduit, pipe or other through-penetration gaps.
Buyers who need a moldable material that can be re-entered for later access.

Less suited to

Those seeking a general-purpose household sealant rather than material intended for fire-rated assemblies.
Buyers who need a clearly confirmed package quantity without checking the listing details.

3M Fire Barrier Moldable Putty Pads MPP+, 7 in x 7 in, Pack of 20 · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 168 ratings

5 stars74%74%
4 stars12%12%
3 stars7%7%
2 stars2%2%
1 star5%5%

Customer feedback reports ease of use and positive impressions of functionality and sound protection, including use for electrical-box soundproofing. These are customer perceptions, distinct from the listing's firestop testing claims. The aggregate ratings lean positive but include lower ratings too, so feedback does not establish suitability for a particular rated assembly.

Positive themes

Customers describe the material as easy to use and report positive functionality.
Feedback mentions perceived sound protection, including around electrical boxes.

Frequently asked questions

What are these putty pads intended for?

The listing describes them for fire-rated wall openings and through penetrations, including protection around electrical boxes and sealing gaps between cables.

How are the pads installed?

They are described as ready to use and hand-formable, with no mixing or tools needed.

What testing does the listing claim?

It states firestop testing up to four hours under ASTM E 814 (UL 1479) and CAN/ULC S115, plus wall-opening protective-material testing up to two hours under UL 263. Applicability depends on the tested assembly and installation.

How many pads are included?

The title says pack of 20, while a separate detail lists an item package quantity of 1. The supplied pad count is therefore unclear from these listing details.