ADINOX M425
Available sizes
About M425
50 ml
Dual cartridge 10:1
490 ml
Dual cartridge 10:1
5 gal
Pail
About ADINOX M425 General Purpose Structural Adhesive
ADINOX® M425 is a general purpose structural adhesive — a two-component, toughened methacrylate formulated for high-performance bonding of metals, including galvanized steel, thermoset and thermoplastic substrates, and composite materials.
Its 10:1 mix ratio and thixotropic consistency simplify assembly across a wide range of joint configurations. The gap-filling capability of this general purpose structural adhesive accommodates irregular joint geometries up to 0.24 in without sagging, enabling efficient production cycles with minimal fixturing time — ideal for trailer and body manufacturing, structural marine assemblies and carbon fiber components.
10:1 Methacrylate Adhesive - Black, Non-Sagging
- Versatile 10:1 mix ratio by volume (9:1 by weight) - thixotropic, non-sagging formulation
- Black bond lines for industrial assemblies where joints are not visible
- Gap filling up to 0.24 in for irregular joints and oversized bond lines
- Open time 4 - 6 minutes - handling strength in 10 - 15 minutes - full cure in 24 hours at 77°F
Toughened Structural Performance
- Tensile strength: 3,191 - 3,481 PSI (ASTM D 638) - lap shear >3,191 PSI on aluminum, cohesive failure
- Outstanding impact resistance: 21 ft·lb/in (ASTM D 256) - thermal cycling resistant
- Cleavage peel strength >23 pli initial / >17 pli average (ASTM D 3807)
- Retains >3,046 PSI after the 30-day environmental cycle and >2,900 PSI after 30-day chemical immersion
Primerless Methacrylate Adhesive - Galvanized Steel Ready
- Primer-free adhesion to metals including galvanized steel, stainless steel and aluminum
- Lap shear >2,756 PSI on galvanized steel (G70) - the zinc coating yields before the adhesive
- As a primerless methacrylate adhesive, most metals bond directly after a solvent wipe
- Ideal for mixed-metal structures with galvanized steel where rigidity and toughness are decisive
Technical Information
Uncured Product Properties
Appearance - Resin A / Activator B | White / Black |
Viscosity A (77°F) | 190,000 - 340,000 cP |
Viscosity B (77°F) | 100,000 - 190,000 cP |
Density A / B / Mixed | 8.05 / 8.95 / 8.15 lbs/gal |
Mix ratio (volume / weight) | 10:1 / 9:1 |
Flash Point (TCC) | 51°F |
Mixed / cured color | Black |
Cured Product Properties
Open time / Working time | 4 - 6 min / 10 - 15 min |
Full cure | 24 hours @ 77°F |
Gap filling | Up to 0.24 in |
Hardness Shore D (ASTM D 2240) | 70 |
Elongation (ASTM D 638) | 30% |
Tensile modulus (ASTM D 638) | 128,000 - 195,000 PSI |
Tensile strength (ASTM D 638) | 3,191 - 3,481 PSI |
Impact resistance (ASTM D 256) | 21 ft·lb/in |
Service temperature | -40 to 250°F |
Recommended application temperature | 65 - 85°F |
Lap Shear Strength by Substrate (ASTM D 1002)
Substrate | Strength | Failure Mode |
Stainless steel / stainless steel | >3,046 PSI | Cohesive failure |
Aluminum / aluminum | >3,191 PSI | Cohesive failure |
Galvanized steel (G70) / galvanized steel (G70) | >2,756 PSI | Substrate failure |
FRP / FRP | >1,595 PSI | Fiber tear |
Aluminum / ABS | >2,031 PSI | Substrate failure |
Cleavage Peel Strength - SS/SS (ASTM D 3807)
Initial peel strength | >23 pli |
Average peel strength | >17 pli |
Environmental Aging - SS/SS (ASTM D 1002)
Initial | >3,046 PSI - cohesive failure |
Environmental cycle - 30 days | >3,046 PSI - cohesive failure |
Cycle: 8 hours at -22°F, 8 hours at 185°F, 8 hours at 86°F at 100% RH. Minimum retention after 30 days of cycling confirms excellent durability.
Chemical Resistance - Al/Al, 30-Day Immersion (ASTM D 1002)
Medium | Retained Strength |
Gasoline | >3,046 PSI |
Acetic acid (10%) | >3,046 PSI |
Xylene | >3,046 PSI |
Lubricating oil HD30 | >3,191 PSI |
Kerosene | >2,901 PSI |
Water @ 73°F | >3,046 PSI |
Water @ 194°F | >2,901 PSI |
How to Use ADINOX M425?
Surface Preparation
- Surfaces must be clean, dry and free of oil, grease, dust and loose particulates - wipe with isopropyl alcohol (IPA) or acetone
- Remove rust or mill scale by abrasion before solvent cleaning - light scuff-sanding improves wetting and joint strength
- Most metals, including galvanized steel, bond directly after a solvent wipe without primer
Prepare the Adhesive
- Purge the dual cartridge before and after attaching the static mixing nozzle until the color is uniform with no streaks
- For previously opened or aged cartridges, cure a small purged amount to confirm reactivity
- Apply enough adhesive to fill the bond gap with controlled squeeze-out - optimal bonding between 65°F and 85°F
Bond and Cure
- Reposition within the 4 - 6 min open time - clamp firmly without thinning the bond line
- Check hardness at joint edges before releasing fixtures - parts can typically move within 10 - 15 minutes at 77°F
- Full mechanical properties develop over 24 hours - clean uncured adhesive with acetone or MEK; cured adhesive only by mechanical removal
Get the ADINOX M425 general purpose structural adhesive through our authorized distributor network, in three dual-cartridge sizes and 5 gal pails.
Join our distributor network and offer your customers low odor, low bloom instant adhesive solutions for cleanroom and precision assembly environments.
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Where to Buy?
If you are using ADINOX M425, you may be interested in
ADINOX® DS 400
Industrial Degreaser
Cleans and degreases substrates before bonding. Recommended surface preparation for M425.
Caulking Guns
10:1 Dispensing Equipment
Manual and pneumatic guns for 10:1 dual cartridges. Required for M425 application.
Mixing Nozzles
Static Mixers 10:1
Ensure a homogeneous 10:1 mix of both components. Essential companion for M425.
Frequently Asked Questions
What is the ADINOX M425 general purpose structural adhesive?
ADINOX M425 is a general purpose structural adhesive: a two-component, toughened methacrylate with a 10:1 mix ratio for high-performance bonding of metals — including galvanized steel — thermosets, thermoplastics and composites.
Does M425 need a primer on galvanized steel?
No. As a primerless methacrylate adhesive, M425 bonds most metals — including galvanized steel evaluated on G60, G70 and G90 grades — directly after a solvent wipe. The zinc restriction applies only to dispensing equipment, not to bonded substrates.
What is the mix ratio of M425?
M425 is a 10:1 methacrylate adhesive by volume (9:1 by weight), dispensed through a static mixing nozzle from a dual cartridge, with a 4-6 minute open time and handling strength in 10-15 minutes.
How strong is M425?
This general purpose structural adhesive delivers tensile strength of 3,191-3,481 PSI (ASTM D 638), lap shear above 3,046 PSI on stainless steel and 3,191 PSI on aluminum with cohesive failure, impact resistance of 21 ft·lb/in and cleavage peel above 23 pli initial.
What gap can M425 fill?
M425 fills irregular joint geometries up to 0.24 in without sagging thanks to its thixotropic consistency, enabling efficient production cycles with minimal fixturing time.
Which substrates does M425 bond?
It bonds aluminum (1000-6000, anodized and 7000 Series), stainless steel, carbon steel, galvanized steel, ABS, PBT, PET, PMMA, polycarbonate, nylon, PPO, PVC, fiberglass (FRP), carbon fiber, Kevlar, wood and porcelain. It is not suitable for PE, PP, PTFE, silicone, copper, brass or bronze.
Is M425 resistant to chemicals and weathering?
Yes. After 30-day immersion (ASTM D 1002, Al/Al), this general purpose structural adhesive retains over 2,900 PSI against gasoline, xylene, 10% acetic acid, HD30 oil, kerosene and hot water, and keeps over 3,046 PSI after the 30-day environmental cycle.
Why is M425 black?
The black bond line is oriented to industrial assemblies where joints are not visible — trailer and body manufacturing, structural marine assemblies and mixed-metal structures with galvanized steel.
What is the service temperature range?
This general purpose structural adhesive performs from -40 to 250°F when cured, with optimal application between 65°F and 85°F.