MAX 750ml Gun Grade Expanding Foam – B3 General Purpose Gap Filler

Product Name

MAX 750ml Gun Grade Expanding Foam – B3 General Purpose Gap Filler

Overview

The MAX 750ml Gun Grade Expanding Foam – B3 General Purpose Gap Filler is a single-component polyurethane foam designed for controlled application with a foam gun, helping reduce waste while improving accuracy on site. It delivers high yield performance, expanding to create approximately 45 litres of foam, and cures quickly with a cutting time of 50–100 minutes to support faster finishing. Once cured, it provides excellent thermal and acoustic insulation performance with thermal conductivity of 30–35 mW/m·K, and remains temperature resistant from -40°C to +90°C. This general purpose foam meets B3 fire class requirements in accordance with DIN 4102-1 Part 1 and can be cut, trimmed, or painted to specification without shrinkage for a clean, durable finish.

Safety Note: As from 24 August 2023, adequate training is required before industrial or professional use of this product containing diisocyanates.

Key Features & Benefits

• Gun grade expanding foam supports controlled, precise application with minimal waste.
• High yield performance expands to create approximately 45 litres of foam.
• Fast curing with cutting time of 50–100 minutes for quicker finishing.
• Excellent thermal and acoustic insulation with thermal conductivity of 30–35 mW/m·K.
• Temperature resistant from -40°C to +90°C once cured for reliable long-term performance.
• B3 fire class performance to DIN 4102-1 Part 1 for general purpose use.
• Paintable, cuttable, and trim-able once cured with a durable, shrinkage-free finish.

Installation & Applications

Designed for use with an applicator gun for professional application control. Suitable for installing and sealing window and door frames, filling and sealing gaps, joints, and cavities, soundproofing, and insulating around electrical outlets and pipework. Apply in layers where required, allowing expansion and curing between applications. Once cured, cut or trim flush and finish as needed with suitable paint or coverings.

Who Is This For?

• Construction and fit-out teams sealing frames, joints, and service penetrations.
• Window and door installers needing controlled, gun-applied foam performance.
• Maintenance teams filling voids and gaps for draught and noise reduction.
• Procurement teams specifying B3 general purpose gun foam for trade use.

Competitive Advantages

This gun grade foam is designed to deliver consistent yield and controlled application, helping teams work more efficiently with less waste than straw-applied foams. Its fast cutting time supports quicker job completion, while the insulation performance and wide cured temperature resistance improve reliability across varied site conditions. B3 classification to DIN 4102-1 Part 1 provides clear positioning as a general purpose foam without confusion with fire-rated B1 or B2 products.

Why CMT Group?

CMT Group supplies trade-ready consumables and sealants from trusted brands, including its own MAX brand, helping professional users buy confidently to specification for consistent on-site results.

• UK trade supplier for site consumables, foams, sealants, and fixings.
• Clear technical specification to support compliance-led procurement.
• Bulk supply options for contractors and multi-site requirements.

Frequently Asked Questions

What is gun grade expanding foam used for?
It is used for filling and sealing gaps, joints, and cavities, plus installing window and door frames and insulating around pipework and outlets.

How much foam does one 750ml can produce?
It expands to create approximately 45 litres of cured foam, depending on temperature, humidity, and application method.

How fast can it be cut or trimmed?
Typical cutting time is 50–100 minutes, helping speed up finishing and trim work.

Is this foam fire rated?
It is classified as B3 to DIN 4102-1 Part 1, which is a general purpose class. It is not a fire-rated B1 or B2 foam.

Do I need training to use this product?
Yes. Safety Note: As from 24 August 2023, adequate training is required before industrial or professional use of this product containing diisocyanates.

Specifications Table

Product Name	MAX 750ml Gun Grade Expanding Foam – B3 General Purpose Gap Filler
Product Code	GF750
Type	Single-component polyurethane gun foam
Can Size	750ml
Yield	Approx. 45 litres (typical)
Cutting Time	50–100 minutes (typical)
Thermal Conductivity	30–35 mW/m·K
Temperature Resistance	-40°C to +90°C once cured
Fire Class	B3 to DIN 4102-1 Part 1
Finish	Paintable, cuttable, trim-able, shrinkage-free once cured
Pack Quantity	Supplied in boxes of 12