Description
Parson Partite 7420 is a two-component, 100% reactive toughened methacrylate structural adhesive. It bonds metals, thermoplastics, thermosets, and composite assemblies with no abrasion or priming required. The non-sag 10:1 formulation fills gaps up to 0.375 in and holds position in vertical and overhead joints. Working time runs 4 to 6 minutes with fixture time at 15 to 18 minutes, and the product carries UL 879 certification.
Key Product Details
| Property | Value |
|---|---|
| Chemistry | Two-component toughened methacrylate (MMA) |
| Certification | UL 879 |
| Color | Adhesive milky-white, activator blue |
| Mix Ratio | 10:1 by volume, 8.9:1 by weight |
| Viscosity | Adhesive 100,000 to 125,000; activator 50,000 to 70,000 (25 C, Brookfield RVT) |
| Working Time | 4 to 6 minutes |
| Fixture Time | 15 to 18 minutes |
| Full Cure | 24 hours |
| Maximum Gap Fill | Up to 0.375 in (10 mm) |
| Tensile Strength | 3,200 to 3,500 psi (ASTM D 638) |
| Modulus | 75,000 to 100,000 psi (ASTM D 638) |
| Strain to Failure | 30 to 50 percent (ASTM D 638) |
| Shore Hardness | 73D (ASTM D 2240) |
| Cleavage Peel | 22 pli initial, 20 pli average, stainless to stainless (ASTM D 3807) |
| Service Temperature | -40 F to 250 F (-40 C to 121 C) |
| Mixed Density | 8.10 lbs/gal (0.97 kg/liter) |
| Flash Point | 51 F (TCC), both components |
| Shelf Life | 6 to 9 months from shipment, stored 55 F to 75 F |
| Available Sizes | 50ml cartridge, 500ml cartridge |
Dispensing Equipment by Size
| Cartridge | Gun | Mixing Tip |
|---|---|---|
| 50ml | DS51-10-00 | Sulzer MBQX 05-16L |
| 500ml | Albion B26T400X10 | Sulzer MFHX 08-18T |
Mixing tips are not interchangeable between the two cartridge sizes. Order the tip that matches the cartridge.
Lap Shear Strength
Tested per ASTM D 1002.
| Substrate | Shear Strength | Failure Mode |
|---|---|---|
| Stainless steel to stainless steel | 3,100 psi (21 MPa) | Cohesive |
| Aluminum to aluminum | 2,910 psi (20 MPa) | Cohesive |
| Aluminum to ABS | 2,150 psi (15 MPa) | Substrate |
| FRP to FRP | 1,700 psi (12 MPa) | Fiber tear |
| ABS to ABS | 1,200 psi (8 MPa) | Substrate |
Values on plastics reflect substrate failure, meaning the plastic gave out before the bond line did.
Chemical Resistance
Aluminum to aluminum bonds cured 7 days at 25 C, then immersed one month and tested per ASTM D 1002.
| Media | Lap Shear |
|---|---|
| Lubricating oil HD30 | 3,240 psi (23 MPa) |
| Gasoline | 3,180 psi (22 MPa) |
| Xylene | 3,150 psi (21 MPa) |
| Acetic acid (10%) | 3,120 psi (21 MPa) |
| Water at 23 C | 3,100 psi (22 MPa) |
| Water at 90 C | 3,000 psi (21 MPa) |
| Paraffin | 2,950 psi (20 MPa) |
Performance in Production
- Non-sag consistency holds the bead in vertical and overhead joints without running onto finished surfaces.
- Fills bond gaps up to 0.375 in, so it works on parts with looser fit-up and fabricated tolerances.
- No abrasion or priming required. Surfaces still need to be clean, dry, and free of dust and grease, and light abrasion immediately before bonding gives the best result.
- Fixture in 15 to 18 minutes at room temperature. Parts reach roughly 80 percent of full strength at 2 to 3 times the fixture time.
- Ambient temperature drives cure speed. Cooler shop conditions extend both working and fixture times, and 25 C is the recommended operating temperature.
- Lap shear increases at low temperature and drops at elevated temperature, with cohesive failure across the tested range.
- 30 days of environmental cycling (-30 C, 85 C, and 30 C at 100 percent RH) did not reduce lap shear on stainless steel.
- Low exotherm during cure. Masses over 1/2 in thick can still exceed 250 F and should be handled in a ventilated area.
- Dispense from cartridges with a 10:1 manual or pneumatic gun and a static mixer, or through meter-mix equipment. On meter-mix systems, keep wetted metal to stainless steel or aluminum and keep the adhesive away from copper, zinc, and brass. Use Teflon or UHMW seals and gaskets.
- Purge a short shot at start-up and confirm the material coming off the mixer tip is uniform and correctly colored before bonding parts.
- Clean uncured material off equipment with industrial solvent before it sets. Cured adhesive requires soaking in strong solvent or paint remover.
- Store between 55 F and 75 F. Refrigeration at 45 F to 55 F extends shelf life. Do not freeze, and keep activator below 100 F to protect reactivity.
Common Applications
- Sign and display fabrication
- Metal fabrication and bonded assemblies
- Automotive component bonding
- Marine assembly
- Plastic tank fabrication
- Thermoform enclosure assembly
- Electrical component bonding
- Bonding dissimilar metal to plastic assemblies such as aluminum to ABS
Available Sizes or Variants
- 50ml cartridge
- 500ml cartridge
Frequently Asked Questions
What is Parson Partite 7420 used for?
Partite 7420 is used for structural bonding of metals, thermoplastics, thermosets, and composites. Typical work includes sign and display fabrication, metal fabrication, automotive components, marine assembly, plastic tanks, thermoform enclosures, and electrical components.
Does Partite 7420 require surface preparation or a primer?
No abrasion or primer is required. Surfaces do need to be clean, dry, and free of dust and grease. Light abrasion immediately before bonding gives the best result.
What is the working time and fixture time?
Working time is 4 to 6 minutes and fixture time is 15 to 18 minutes at room temperature. Full cure is 24 hours. Cooler shop temperatures extend both times.
How large a gap can Partite 7420 fill?
Up to 0.375 in (10 mm).
What is the mix ratio?
10:1 by volume, 8.9:1 by weight. It dispenses from a 10:1 cartridge gun with a static mixing tip.
What gun and mixing tip do I need?
The 50ml runs on a DS51-10-00 gun with a Sulzer MBQX 05-16L tip. The 500ml runs on an Albion B26T400X10 gun with a Sulzer MFHX 08-18T tip. The tips are not interchangeable between sizes.
Is Partite 7420 UL certified?
Yes. Partite 7420 is a UL 879 certified adhesive.
What temperatures can the cured bond handle?
Service temperature is -40 F to 250 F (-40 C to 121 C). Lap shear strength increases at low temperature and decreases as temperature rises.
How should Partite 7420 be stored?
Store between 55 F and 75 F for a 6 to 9 month shelf life from date of shipment. Refrigeration at 45 F to 55 F extends shelf life. Never freeze the material, and keep the activator below 100 F.
Is there a Chemical Concepts alternative to Partite 7420?
UltraLok 420-1 is used in similar structural bonding applications. Confirm performance against your substrates and requirements before switching.
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