Description
Pacer MR-10 has been discontinued and is no longer available. It was the water-thin grade in Pacer’s MR Series, a moisture resistant ethyl hybrid cyanoacrylate at 6 to 12 cP with .002 in gap capability. This page stays up for two reasons. The specifications are still useful if you have material on the shelf or need them for a record, and MR-10 held the strongest published figures of any Pacer cyanoacrylate, so anyone replacing it needs to know exactly what they are giving up.
The MR Series is formulated to hold tensile shear strength in moist and humid conditions and to maintain strength under thermal cycling. That gave MR-10 a cured temperature range of -65F to +260F, 80 degrees higher than any grade in Pacer’s E or RX families, along with 2800 psi shear on steel and 1950 psi on aluminum, both the highest figures Pacer publishes across its cyanoacrylate line.
What to Use Instead
Good news first: the surviving MR grades keep all of the moisture and thermal performance. What you lose is the viscosity. MR-10 was water-thin at 6 to 12 cP, and the thinnest MR grade now available is MR-290 at 250 to 350 cP, roughly 30 times thicker.
| If you need | Use | What you give up |
|---|---|---|
| The moisture resistance, thermal cycling performance, and +260F range | Pacer MR-290, 250 to 350 cP | The thin viscosity. It will not wick into a closed joint. Gap capability goes the other way though, from .002 in up to .012 in |
| Maximum moisture and thermal performance regardless of viscosity | Pacer MR-3000, 2500 to 3500 cP | Any hope of a thin bond line. It actually beats MR-10 on hot water immersion, holding 1850 psi at 30 days against MR-10’s 1400 |
| The water-thin wicking behavior at the same .002 in gap | Pacer E-5, 2 to 10 cP | All of it. E-5 is a general purpose grade rated to +180F with no hot water or thermal cycling data, and 2700 psi on steel against 2800 |
| Both the thin viscosity and the moisture resistance | Call us | Nothing in the current Pacer line covers it. We stock other manufacturers and can look at what fits |
If MR-10 was in a qualified process, the third row is the wrong move. Swapping a moisture resistant grade for a general purpose one gives up the exact property you were paying for, and the difference only shows up months later in service. Talk to us before you requalify anything. Call (800) 220-1966 or email [email protected].
Pacer MR-10 Specifications, For Reference
Retained for anyone holding remaining stock, keeping a quality record, or comparing against a replacement grade.
| Property | Value |
|---|---|
| Status | Discontinued |
| Chemistry | Ethyl hybrid cyanoacrylate |
| Grade | Moisture Resistant, MR Series |
| Color | Clear, transparent liquid |
| Viscosity | 6 to 12 cP |
| Typical Gap | .002 in |
| Fixture Time | 1 to 5 minutes |
| Strength Development | 80% of full strength in 15 to 30 minutes |
| Temperature Use Range | -65F to +260F (-54C to +127C) |
| Softening Point | 310F / 155C |
| Melting Point | 366F / 186C |
| Flashpoint | 185F |
| Specific Gravity | 1.05 at 20C |
| Vapor Pressure | 6 mm Hg at 70C |
| Rockwell Hardness | M 73 |
| Outgassing | 0 (at 10^-6 mmHg, 72F) |
| Tensile Strength, Steel | 4500 psi |
| Soluble In, Liquid State | Acetone, MEK, nitromethane |
| Soluble In, Cured State | Pacer X-9 Debonder, acetone, nitromethane |
| Specification Compliance | MIL-A-46050C Type II, Class 1; A-A-3097 Type II, Class 1 |
| Shelf Life | One year, stored per the TDS |
| Sizes Offered | 1 lb (453 g) Bottle, FG04443. A 20 gram, FG04440, appears on Pacer’s data sheet but was not carried on our last price list. |
Shear Strength by Substrate
Tested per ASTM D-1002, all figures +/- 10%. Where the table reads substrate failure, the part broke before the bond did.
| Substrate | Shear Strength, psi |
|---|---|
| Steel | 2800 |
| Aluminum | 1950 |
| ABS | Substrate failure |
| Rigid PVC | Substrate failure |
| Nylon | Substrate failure |
| SBR | Substrate failure |
| EPDM | 100 |
Hot Water Immersion and Thermal Cycling
This data is what separated the MR Series from every other Pacer cyanoacrylate family, and no grade outside MR publishes anything comparable. Both tests are on steel, per ASTM D-1002, +/- 10%.
| Condition | MR-10, psi | Retained |
|---|---|---|
| Initial | 2800 | Baseline |
| Hot water immersion, 7 days at 104F (40C) | 1700 | 61% |
| Hot water immersion, 14 days at 104F | 1500 | 54% |
| Hot water immersion, 30 days at 104F | 1400 | 50% |
| Cold and heat cycling, 10 cycles | 2600 | 93% |
| Cold and heat cycling, 20 cycles | 2600 | 93% |
One cycle is 3 hours at -22F followed by 3 hours at 158F. The retained percentages are calculated from Pacer’s published figures.
If you were specifying MR-10 for either of these conditions, the surviving MR grades hold up as well or better. MR-290 holds 1500 psi at 30 days immersion and 2700 after 20 cycles. MR-3000 holds 1850 psi at 30 days and 2700 after cycling, which makes it the most water-resistant grade Pacer publishes.
Current Pacer MR Series Grades
| Grade | Viscosity | Typical Gap | Steel Shear | 30 Days at 104F |
|---|---|---|---|---|
| MR-10, discontinued | 6 to 12 cP | .002 in | 2800 psi | 1400 psi |
| MR-290 | 250 to 350 cP | .012 in | 2800 psi | 1500 psi |
| MR-3000 | 2500 to 3500 cP | .020 in | 2900 psi | 1850 psi |
Every MR grade shares the same -65F to +260F temperature range, the same ethyl hybrid chemistry, and the same 4500 psi tensile on steel. Losing MR-10 costs you the thin end of the family, not the performance the family exists for.
Related Products
- Pacer MR-290 Moisture Resistant, 250 to 350 cP, .012 in gap, the thinnest MR grade currently offered
- Pacer MR-3000 Moisture Resistant, 2500 to 3500 cP, .020 in gap, the best hot water immersion figures Pacer publishes
- Pacer E-5 Ultra-Low Viscosity (2-10 cP), the general purpose grade at MR-10’s viscosity and gap, without the moisture or thermal performance
- Pacer RX-50 Range Extended (30-70 cP), if the real problem is a contaminated or plated surface rather than moisture
- Pacer Premium Acetone Accelerator, speeds full cure through larger gaps
- All cyanoacrylate instant adhesives
Frequently Asked Questions
Is Pacer MR-10 discontinued?
Yes. Pacer MR-10, part number FG04443, is no longer available. It was the 6 to 12 cP water-thin grade in the MR Series Moisture Resistant line. The series now starts at MR-290 at 250 to 350 cP.
What is the replacement for Pacer MR-10?
MR-290 for most jobs. It keeps everything the MR Series exists for, the -65F to +260F range, the hot water immersion performance, the thermal cycling resistance, and the same 2800 psi shear on steel. What it does not keep is the viscosity: MR-290 is 250 to 350 cP against MR-10’s 6 to 12, so it will not wick into a closed joint. If your process depended on wicking, call us, because no current Pacer grade combines that with moisture resistance.
What made the Pacer MR Series different?
Two things no other Pacer cyanoacrylate family publishes. A cured temperature range of -65F to +260F, which is 80 degrees higher than the E and RX families at +180F. And actual durability data: hot water immersion out to 30 days at 104F, and thermal cycling through 20 cycles from -22F to 158F. If your joint gets wet, gets hot, or goes through freeze and heat swings, that data is the reason to specify an MR grade rather than a general purpose one.
Was MR-10 the strongest Pacer cyanoacrylate?
On shear it was among the strongest. 2800 psi on steel and 1950 psi on aluminum are the highest figures Pacer publishes across its cyanoacrylate families, matched by MR-290 and beaten only by MR-3000’s 2900 psi on steel. Its 4500 psi tensile on steel is shared across the MR Series and sits above the 4000 psi typical of the E and RX grades. So losing MR-10 does not cost you the strength, since MR-290 and MR-3000 carry the same figures.
Can I still get specifications for Pacer MR-10?
Yes, they’re on this page. Full liquid and cured state properties, shear strength by substrate, hot water immersion and thermal cycling figures, and specification compliance are retained above. If you need the data sheet itself or a document for a quality record, call or email us.
I have MR-10 in stock. Is it still usable?
Depends on age and storage. Pacer’s stated shelf life is one year when refrigerated unopened at 40F (4C), allowed to reach room temperature before opening, then stored in a cool, dry location. Discontinuation does not affect material you already have, but a cyanoacrylate past its shelf life thickens noticeably, and thickened CA has reached the end of its useful life. Test on scrap before you put it on a production part.
What size was Pacer MR-10 supplied in?
We carried the 1 lb (453 g) bottle, part number FG04443, UPC 0 87093 00270 8. Pacer’s data sheet also lists a 20 gram as FG04440, which was not on our last price list. Of the current MR grades, MR-290 and MR-3000 are both available in a 1 lb bottle.
Questions on Fit
Need to replace MR-10 in a running process? Call (800) 220-1966 or email [email protected] and tell us the substrate, the joint, and what the assembly sees in service. Moisture and thermal exposure are the details that matter here.
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