Practical Guide
WIWA DOSYS M: 2K Mixing & Dosing without Air Inclusions – How to Safely Process Small Quantities
When 2K epoxy, PU adhesives, or sealants are mixed by hand, a classic problem almost always occurs: air is introduced – and bubbles appear later on the surface or in the glue gap. The WIWA DOSYS M is built exactly for this everyday challenge: bubble-free mixing, maintaining a constant mixing ratio, and controlled dispensing of even the smallest amounts – right down to precise stopping mid-stroke for selective applications.
Short Conclusion for Decision Makers
- Constant mixing ratio instead of daily form
- Clean, uniform results through low-bubble/bubble-free conveying & mixing
- Smallest quantities precisely meterable (selective, stoppable)
- Pneumatic, easy to operate (ideal for workshop & assembly)
Product Overview: Variants, Applications, Advantages
| Variant / Mixing Ratio | Typical Materials | Daily Strength | Guideline: Output per Double Stroke* |
|---|---|---|---|
| 1:1 | 2K Epoxy, 2K PU, Filler/Putty | Constant ratio, consistent quality | approx. 0.82 l |
| 2:1 | Adhesives, Sealants, Thixotropic systems | Clean dosing of small batches | approx. 0.62 l |
| 10:1 | Adhesives/Sealants with low B-component | Process-reliable despite "small" hardener share | approx. 0.32 l |
| 100:3 (extreme) | Special systems (e.g., very small B-component) | Process-stable implementation of extreme mixing ratios | approx. 0.42 l |
*Guideline values from the system overview; real values depend, among other things, on material viscosity, periphery, and setup.
KPI 1
Less Waste
Consistent mixing reduces rework (bubbles/pores, uneven curing).
KPI 2
Constant Quality
Mixing ratio remains stable – regardless of the user & daily form.
KPI 3
Controlled Micro-quantities
Dose selectively – if necessary even stop in the middle of the stroke (practical for spot applications).
Pro Tip: Defuse bubbles & surface defects immediately
For critical visible surfaces, start with short test beads on scrap material and adjust the output so that the bead runs evenly without "spitting". For spot applications, use the start/stop function (e.g., via foot control) and stop deliberately as soon as the target quantity is reached – instead of pushing more "by feel."
Select the appropriate WIWA DOSYS M variant now
Directly to the product variants in the shop (max. 4 buttons):
Recommended Basic Settings (Guideline Values)
- Max. Air Inlet Pressure: up to 6 bar (guideline) – as low as possible for the material & process, as high as necessary.
- Mixing Ratio: Choose the appropriate variant (e.g., 1:1, 2:1, 10:1, 100:3) according to the material data sheet.
- Dosing Quantity (guideline per double stroke): depending on the ratio approx. 0.32–0.82 l – use test outputs for fine-tuning.
- Smallest Quantities/Spot Jobs: use controlled start-stop and – if necessary – cancel mid-stroke for the target quantity.
- Options as Needed: Pressure tank for component B, cartridge filling unit (stroke reduced), foot switch mounting kit.
Note: Values are guideline values from the product overview; project-specific design (material, hose lengths, viscosity, environment) may require adjustment.
Professional Workflow (5–7 Steps)
- Material Check: Check mixing ratio & pot life from the material data sheet; select appropriate DOSYS M variant.
- Prepare Containers: Connect component A/B correctly; ensure clean extraction (no dirt, no moisture for sensitive systems).
- Set Pressure: Connect air supply and start with moderate pressure (guideline in the system: max. 6 bar).
- Test Delivery: Perform a short trial delivery until a steady bead runs without interruptions.
- Application: Dose target quantity; use start/stop for spot applications and stop mid-stroke if necessary.
- Quality Check: Check surface/bead appearance (bubbles, streaks, uneven consistency) and readjust pressure/handling if necessary.
- Cleaning/Downtime: Clean or secure after work according to material and manufacturer specifications – especially for fast-reacting systems.
Troubleshooting: 4 Typical Problems
1) Bubbles/Pores in the result
- Extend trial deliveries until the bead is truly stable.
- Dose with calm, steady trigger/start-stop guidance (no "pumping").
- Check material handling: material that is too cold/too viscous promotes air inclusions → temper if necessary (project-specific).
2) Unclean Mixture (streaks, soft spots)
- Ensure that the correct mixing ratio variant is being used.
- Check feeds/connections A & B for mix-ups and tightness.
- Configure options/setup (e.g., pressure tank B) appropriate to the application.
3) Delivery fluctuates / "Spitting"
- Stabilize air pressure (check regulator/supply) and do not run higher than necessary.
- Check hose routing for kinks/too tight radii; clean, tension-free laying.
- Make a short stabilization delivery before the actual application.
4) Material cures / Downtime problems
- Consistently secure (start-stop) during short breaks instead of letting material "stand."
- Adapt cleaning/securing routine to pot life (material dependent).
- Use suitable cartridge filling option for cartridge jobs (keep setup clean).
Maintenance (5 Points)
- Daily: Visual inspection for leaks at connections, hoses, and couplings.
- Regularly: Check cleaning status at the mixing/delivery area (material dependent).
- Air Supply: Minimize water/oil in the compressed air network (filter/maintenance unit according to operating instructions).
- Periphery: Check accessories (foot switch, cartridge setup, pressure tank B) for function & tightness.
- Spare Parts/Service: Stock wear parts proactively – especially for high-frequency spot jobs.
FAQ (Practical Relevance)
1) Which materials are suitable for the DOSYS M?
Typically 2K fillers based on epoxy/PU/peroxide, adhesives, sealants, thickeners, mastics, and insulating materials – anywhere where a constant ratio & clean delivery count.
2) Can I really dose micro-quantities safely?
Yes, the focus is on small quantities – for selective applications, the delivery can be very finely controlled, including stopping mid-stroke (ideal for point gluing).
3) What mixing ratios are available?
The system overview includes 1:1, 2:1, 10:1, and extreme ratios like 100:3 – choose according to the material data sheet and process.
4) How high can the air pressure be?
A max. air inlet pressure of 6 bar is given as a guideline. In practice: as low as possible for clean operation, as high as necessary for the desired delivery stability.
5) Which options are most often worthwhile?
Start-stop via foot control, pressure tanks for component B, and cartridge filling accessories are frequently used – depending on the application and cycle.
Conclusion
The WIWA DOSYS M is a practical 2K system for everyone who needs to process small quantities repeatably, cleanly, and economically: constant mixing ratio, controllable dosing, and noticeably less rework due to typical manual mixing effects. If you regularly do spot jobs, cartridge filling, or precise gluing, this setup is a clear process upgrade.
Note: All settings/performance values in the article are to be understood as guideline values and may deviate depending on material, setup, and environment.
