S-G990 Semi-Automatic Potting Machine by Southern Machinery

What is the S-G990 used for? The S-G990 is a semi-automatic two-component potting machine that meters, mixes and dispenses epoxy resin, polyurethane, electronic silicone and similar potting compounds. Per the source presentation, it offers adjustable mixing ratios from 1:1 to 10:1, dispensing of 1 to 20 g/sec, and a handheld swing-arm design with a usable radius of 1000 mm.

Most potting problems are not adhesive problems

Bubbles, stringing, dripping and uneven fill usually get blamed on the compound. In practice they often trace back to unstable ratio control, pressure swings and a mixing head that cured while nobody was watching. The source describes a control system that is unaffected by air pressure fluctuations, aimed at exactly those issues.

Why does a manual or half-automatic potting step stay the bottleneck?

Teams that pot power supplies, sensors, LED drivers or control modules often keep the process semi-manual because volumes are mixed and fully automatic cells are hard to justify. The hidden cost is waste: pre-mixed batches that cure in the cup, purge cycles that burn material and operators who clean mixing tubes by hand. The question is not "manual or automatic" but "which steps must be controlled".

What is a four-step framework for choosing a potting machine?

1. Match the adhesive

The source lists adhesive viscosity within 50,000 cps in the applicable-adhesives section, while the additional parameter table shows MAX 5000 cps. These two figures differ, so confirm the viscosity limit with Southern Machinery before you commit. Fillers should be above 200 um in particle size and under 50% of adhesive volume.

2. Match the ratio

Selectable ratios are 1:1, 1:2, 1:3, 1:4, 1:5 and 1:10, set by choosing the metering pump (gear, screw or plunger pump). Metering and mixing accuracy is stated as plus or minus 3%.

3. Match the dispensing mode

Modes include Part A only, Part B only, fixed-quantity A/B mixed, manual dispensing, and a multi-stage mode with up to five stages, each with its own volume and speed.

4. Match the upkeep burden

Automatic cleaning with multiple modes, an anti-curing program during pauses, and a solvent recycling system reduce manual cleaning and waste.

How does the S-G990 work in practice?

Part A and Part B sit in separate stainless steel pressure tanks (30 L each, plus a 5 L cleaning tank), so material does not cure in storage. A and B mix on demand, either with a static or dynamic mixing valve, so only what is needed is mixed. Liquid-level sensors raise alarms for shortage or full tanks and stop the machine when material is insufficient. Automatic feeding, stirring, optional heating and a reserved vacuum degassing function suit different potting processes. Production counting, single-piece timing and operation monitoring are included.

An operator moves the dispensing head with a handheld jog button or foot switch along a linear-interpolation trajectory, which keeps the process flexible for different housings and fixtures.

Which specifications matter before you buy?

| Item | Source specification |

|---|---|

| Mixing ratios | 1:1, 1:2, 1:3, 1:4, 1:5, 1:10 |

| Metering / mixing accuracy | plus or minus 3% |

| Dispensing accuracy | plus or minus 3% |

| Dispensing speed | 1 g/sec to 20 g/sec |

| Tanks | Part A 30 L, Part B 30 L, cleaning 5 L |

| Motion range | Usable radius 1000 mm |

| Machine size | L 1300 x W 1200 x H 1500 mm |

| Weight | Approx. 200 kg |

| Power supply | AC220V / 50Hz |

| Working air pressure | 0.5-0.7 MPa |

| Environment | 0-40 C, humidity 20-91% |

| Heating | Optional, according to adhesive data |

| Control | PLC, two stepper motors for A/B pumps |

Where does it fit in a PCB assembly line?

Potting usually follows soldering, testing and inspection, when finished modules are encapsulated for protection. Southern Machinery supplies SMT and THT lines, THT machines, wave soldering, board handling and 3D SPI/AOI, so a potting station can be planned together with the rest of the line. Line integration details are not specified in source: contact Southern Machinery to confirm.

How can you estimate the value of a controlled potting step?

Monthly saving = (adhesive waste before - after) x material cost + rework avoided x cost per rework

Example only: if mixed-adhesive waste falls from 10 kg to 6 kg a month at 8 per kg, material saving is 32, before rework. These figures are illustrative, depend on configuration, and are subject to final technical confirmation. No result is guaranteed.

FAQ

Which adhesives does it handle? Two-component epoxy resin, polyurethane, electronic silicone, potting compound and liquid silicone, per the source.

Can it mix at 1:10? Yes, ratios from 1:1 to 10:1 are selectable through metering pump choice.

Is heating included? Heating is optional.

Is vacuum degassing available? A vacuum degassing function is reserved; automatic feeding and vacuum are listed as options in the parameter table.

What support is offered? The source lists 7x24 worldwide support, free installation and training, 1-day spare parts lead time and 1-month customized solutions.

Next steps

Next in this series: how to compare semi-automatic and fully automatic potting for your product mix. Founded in Shenzhen in 2011, Southern Machinery serves 237+ global customers with SMT and THT automation, spare parts and training. Request a quote or contact us.