Short answer: A Mixpac-series static mixer only fits the cartridge that shares its interface geometry. Mixpac A-System nozzles (MAH, MAHX, MAQ) use a bayonet twist-lock and interchange with any 50 mL bayonet cartridge — including Nordson EFD and most generic A-System mixers. Mixpac C-System nozzles (MCH, MCQ) use a bell / retaining-nut fit and interchange across C-System barrels. Mixpac B-System (MBH, MBHX) and F-System (MFH, MFQX) use patented interlock connections that are generally not cross-compatible with other brands. The full matrix — and a two-minute check that removes all doubt — is below.
Why “Compatible” Depends on the Interface, Not the Brand
Static mixers are disposable. What actually decides fit is the mechanical interface at the cartridge mouth: the bayonet lugs, the bell collar, or the interlock keys. Mixpac, Nordson EFD, 3M and most private-label makers all build to a small set of shared physical standards. When two nozzles share the same geometry and ratio range, they are physically interchangeable — even if the boxes carry different brands. When the interface is proprietary, no amount of “it looks close” makes it safe. Distributor compatibility matrices make the same point: B-System and F-System use patented connections that are “generally not compatible with other systems.”
Mixpac’s Four Interface Families at a Glance
| Mixpac series | Interface | Typical cartridge | Ratios | Mixer families |
|---|---|---|---|---|
| A-System (MAH / MAHX / MAQ) | Bayonet twist-lock | 50 / 75 mL | 1:1, 2:1, 4:1, 10:1 | MAH (1:1/2:1), MAHX (4:1/10:1), MAQ Quadro (1:1/2:1) |
| B-System (MBH / MBHX) | Interlock (anti-cross-contamination) | 25 / 50 / 75 mL | 1:1, 2:1, 4:1, 10:1 | MBH (helix), MBHX (interlock, 4:1/10:1) |
| C-System (MCH / MCQ) | Bell / retaining nut | up to 400 mL | 1:1, 2:1 | MCH (helix), MCQ Quadro |
| F-System (MFH / MFQX) | Interlock | 200 / 400 mL | 1:1, 2:1, 4:1, 10:1 | MFH (helix), MFQX Quadro |
Source: Sulzer Mixpac system definitions — see medmix (Mixpac) and distributor compatibility notes.
The Compatibility Matrix — What Interchanges With What
| Your nozzle | Fits these cartridges | Does NOT fit | Watch-outs |
|---|---|---|---|
| MAH / MAHX (A-System, bayonet) | Any Mixpac A, Nordson 50 mL bayonet, generic A-System 50/75 mL | B / C / F cartridges; 200 mL+ bell cartridges | Match the ratio — MAH for 1:1/2:1, MAHX for 4:1/10:1 |
| MAQ Quadro (A-System, bayonet) | Same bayonet A-System family as MAH/MAHX | B / C / F | Square element — check bore/length for your viscosity |
| MBH / MBHX (B-System, interlock) | Mixpac B-System only (OEM-matched) | Non-Mixpac brands | Patented interlock; cross-contamination guard — don’t force a bayonet fit |
| MCH / MCQ (C-System, bell) | Mixpac C-System and other bell-fit C barrels | A / B / F; small bayonet cartridges | Larger volumes; confirm bell collar diameter |
| MFH / MFQX (F-System, interlock) | Mixpac F-System only (OEM-matched) | Non-Mixpac brands | Patented interlock; 200/400 mL |
Nordson EFD and 3M EPX Cross-Fit
Nordson EFD’s side-by-side 50 mL cartridges use the same bayonet / bell geometry as the Mixpac A-System, so most A-System nozzles (MAH, MAHX) seat correctly. 3M’s Scotch-Weld EPX uses its own EPX bayonet / bell on 48.5–50 mL and 200/400 mL cartridges; EPX nozzles are sized for EPX barrels, so treat EPX as its own sub-family rather than assuming A-System interchange. When in doubt, the two-minute check below settles it.
When Mixing Brands Backfires
- Forcing a proprietary interface. B-System and F-System interlocks are designed to resist cross-fit. Forcing a bayonet nozzle onto an interlock cartridge leaks Part A/B before mixing — producing a soft, non-curing bead.
- Ratio mismatch. A 1:1 nozzle on a 10:1 cartridge under-mixes; the joint stays tacky. Always match the molded ratio code.
- Element-color confusion. Round (helical) elements are usually white/yellow/blue; square (Quadro) elements are green for 1:1–2:1 and orange for 4:1–10:1. Same color does not mean same system.
Confirm Interchangeability in 2 Minutes
- Read the molded code. Brand, diameter and element count are often molded into the nozzle body (e.g., “MAH 05-20T”). That string tells you the family and ratio.
- Match the interface. Bayonet = A-System class; bell nut = C-System class; interlock = B/F proprietary.
- Still unsure? Send us a photo of your gun tip or current nozzle and we’ll confirm the exact cross-compatible Haijing part.
Haijing A / B / C / F-System Mixers
Haijing builds disposable mixers in the A, B, C and F interface families, each engineered to the geometry above. Our A-System and C-System mixers follow the open bayonet / bell standards and interchange with the cartridges listed in the matrix; our A-System nozzle line covers 1:1 through 10:1. For B/F interlock formats we supply OEM-matched parts — tell us your cartridge and we’ll point you to the right one.
Frequently Asked Questions
Can I use a generic nozzle on a Mixpac A-System cartridge?
Yes — any nozzle built to the A-System bayonet geometry and the correct ratio fits. That includes Nordson EFD 50 mL bayonet nozzles and generic A-System mixers. Match the ratio code (MAH for 1:1/2:1, MAHX for 4:1/10:1).
Are Mixpac B-System nozzles compatible with other brands?
Generally no. B-System and F-System use patented interlock connections intended to prevent cross-contamination and are not cross-compatible with other brands. Use OEM-matched B/F nozzles.
What does the element color mean?
Round (helical) elements are typically white, yellow or blue; square (Quadro) elements are green for 1:1–2:1 ratios and often orange for 4:1–10:1. Color signals geometry and ratio range, not brand.
My nozzle threads on but the mix is streaky. Why?
Two likely causes: the ratio code doesn’t match your cartridge (under-mixing), or you’ve forced a near-but-not-equal interface so Part A/B isn’t fully separated until mixing. Re-check the molded code and the interface type.
How do I know which Mixpac series I have?
Read the molded code on the nozzle body, or check your cartridge’s system letter (A/B/C/F printed on the barrel). If the label is gone, email us a photo of the cartridge mouth and gun.
Conclusion
Compatibility is an interface problem, not a brand problem — except where the interface is patented. A-System (bayonet) and C-System (bell) nozzles are broadly cross-compatible; B-System and F-System interlocks are OEM-matched. Pick by interface + ratio, and when the label is missing, send a photo. Browse Haijing mixers by system or pair them with the right cartridge.
