Pacer MR-290 Moisture Resistant Cyanoacrylate Adhesive – 1 lb (453 g) Bottle

This 1 lb (453 g) bottle of Pacer MR-290 is the production volume size of Pacer’s moisture resistant cyanoacrylate, 250 to 350 cP with .012 in gap capability. It’s the size for a line bonding assemblies that get wet, run warm, or cycle through temperature in service. MR-290 is rated -65F to +260F, holds 1500 psi on steel after 30 days submerged at 104F, and retains 96% of its strength through 20 thermal cycles. At 453 g it holds about 23 times what the 20 gram bottle does, and it sells individually rather than by the case.

Package Details

Full immersion and thermal cycling data, shear strength by substrate, and the MR grade selector are on the main Pacer MR-290 product page, or in the Pacer MR Series technical data sheet (PDF).

Choosing the 1 lb Over the 20 Gram

• 453 g against 20 g, about 23 times the material, and it sells individually rather than in a case of 10, so it’s the easier single purchase.
• Prove the bond first if you’re new to the grade. MR chemistry gets specified for a service condition, so run the 20 gram on the actual part with the actual exposure before you buy a pound.
• This is a bulk container, not a bench bottle. Most shops decant into applicator bottles or charge a dispensing system from it rather than handing the 1 lb to an operator.
• Refrigeration matters more at this size. A cold 1 lb bottle takes real time to reach room temperature, and opening it before it does pulls condensation into a lot of material at once.
• Shelf life is one year stored per the data sheet, and an opened container works against ambient humidity from day one. Buying beyond your annual consumption does not save money.
• Worth knowing across the family: MR-290 and MR-3000 are both available in a 1 lb, so you can standardize either grade at volume.

Performance in Production

• Enough volume to feed a daily bonding operation without a purchase order every other week.
• Rated -65F to +260F, 80 degrees above every grade in Pacer’s E and RX families. If the assembly runs warm, this is the family.
• Holds 1500 psi on steel after 30 days submerged at 104F and 2700 psi after 20 thermal cycles from -22F to 158F. Size the bond area against the degraded figure if the assembly will see the exposure, not the dry 2800 psi.
• .012 in gap capability absorbs fit-up variation across a production run, which matters more at volume than on a bench where an operator can sort parts.
• 2800 psi shear on steel and 2100 psi on aluminum, both near the top of the Pacer range and well above the 1600 psi aluminum figure typical of the E and RX grades.
• Fixture in 1 to 5 minutes and 80% of strength in 15 to 30 minutes. A filled .012 in gap cures from the outside in, so allow the longer end before loading.
• Plan a Pacer accelerator into the station if you work near the top of the gap range, since Pacer recommends accelerators specifically to speed cure through larger gaps.
• Decant only what gets used in a shift and keep transfer containers dry and capped. Cure rate tracks relative humidity, so open material in a humid shop behaves differently than a fresh bottle.
• Still a liquid at 250 to 350 cP with no published sag figure. Build the station around a horizontal or fixtured joint.
• EPDM comes in at 100 psi. If EPDM is your substrate, the RX Series is the better family.

Common Applications

• Daily production bonding of assemblies that get wet in service
• Marine component manufacturing
• Pool, spa, and plumbing hardware at volume
• Washdown environments and outdoor equipment
• Lines bonding joints that run warm, up to +260F
• Aluminum and light alloy bonding at 2100 psi shear
• Runs with fit-up variation up to .012 in
• Feeding automatic dispensing equipment on a bonding cell
• Filling shop applicator bottles from bulk
• Contract manufacturing calling out MIL-A-46050C Type II, Class 2

Related Products

• Pacer MR-290 Moisture Resistant Cyanoacrylate Adhesive, full immersion and cycling data, both sizes
• Pacer MR-3000 Moisture Resistant, .020 in gap and 1850 psi after 30 days immersion, also available in a 1 lb
• Pacer RX-100 Range Extended (80-120 cP), for plated, oily, or acidic surfaces, and the better family for EPDM
• Pacer E-100, 1 lb bottle, the general purpose Class 2 grade for dry indoor service
• Pacer Premium Acetone Accelerator, speeds full cure through larger gaps
• All cyanoacrylate instant adhesives

Frequently Asked Questions

How much adhesive is in a 1 lb bottle of Pacer MR-290?

Net weight is 1 lb (453 g), about 23 times the 20 gram bottle. Pacer’s guidance is one free-falling drop per square inch of bond area, but Pacer does not publish a coverage figure per gram, and a thicker grade filling a wider gap uses more per joint. If you need to budget material against a part count, send us the part and we’ll work it out from a sample.

Will cyanoacrylate hold up in water?

A moisture resistant grade will, to a documented degree. MR-290 holds 1500 psi on steel after 30 days submerged at 104F, down from 2800 psi initially, so roughly 54% retention. Most cyanoacrylates publish nothing on immersion at all, which is not the same as passing. Design the bond area against the degraded figure if the assembly will be wet in service.

Is the 1 lb Pacer MR-290 the same adhesive as the 20 gram?

Yes, identical. Same moisture resistant chemistry, same 250 to 350 cP viscosity, same .012 in gap capability, same -65F to +260F range, same MIL-A-46050C Type II, Class 2 rating. Only the container and the order quantity change. Nothing needs requalifying when you step up.

Which Pacer MR grades come in a 1 lb bottle?

MR-290 and MR-3000 are both available in a 1 lb bottle, so you can standardize either grade at production volume. MR-290 is the thinner of the two at 250 to 350 cP filling .012 in. MR-3000 is 2500 to 3500 cP filling .020 in and holds up better under extended immersion.

Can I decant Pacer MR-290 into smaller applicator bottles?

Shops do it routinely with bulk CA, and Pacer’s published guidance does not cover decanting, so treat it as shop practice rather than a manufacturer instruction. Keep transfer containers clean, dry, and capped, and move only what gets consumed in a shift, since cure rate depends on relative humidity. If you need Pacer’s formal position on repackaging for a quality system, we’ll ask them.

How should Pacer MR-290 be stored, and what is the shelf life?

Refrigerate unopened bottles at 40F (4C) for optimum results, then let the adhesive come up to room temperature before opening. A 1 lb bottle takes longer to warm through than a small one, so give it time, since opening it cold draws condensation into the material. Once opened, store in a cool, dry location. Stored that way, expect a one year shelf life.

What is the part number for the 1 lb Pacer MR-290?

Our SKU is PAC-FG04453. The Pacer part number is FG04453 and the UPC is 0 87093 00272 2. On older Pacer paperwork the same item shows as Pacer item number 11740057.

Questions on Fit

Questions on fit for your bonding process, or on volume for a production line? Call (800) 220-1966 or email [email protected].