What solvent-free bonding means
Solvent-free bonding means joining parts with adhesives that contain no organic solvents. The main industrial options are hot melts, which are applied molten and set by cooling; water-based adhesives, which dry as water evaporates; and 100% solids reactive adhesives that cure chemically. Hot melts are the fastest of these because they need no drying or curing time.
Why move away from solvent adhesives
- Emissions: solvents evaporate as VOCs that need ventilation or abatement.
- Safety: many solvents are flammable and require explosion-proof storage and equipment.
- Health: workers are exposed to vapors during mixing, application and drying.
- Process time and energy: solvent adhesives need flash-off time or drying ovens.
- Regulation and customer requirements increasingly favor low-VOC products.
Solvent-free options compared
| Option | How it sets | Speed | Main limits |
|---|---|---|---|
| Hot melt (EVA, PO, polyamide) | Cooling | Seconds | Needs melting equipment; thermoplastic, so match to service temperature |
| Reactive PUR hot melt | Cooling, then moisture cure | Fast handling, full cure later | Moisture-sensitive handling and equipment care |
| Water-based | Water evaporation | Minutes to hours | Drying time; water resistance varies |
| Two-part reactive (epoxy, PU) | Chemical cure | Minutes to hours | Mixing, pot life, curing time |
How low-VOC adhesives improve workplace safety
Removing solvents lowers vapor exposure for operators, removes a major source of fire risk on the line, and reduces the need for solvent storage, extraction and abatement. It also simplifies compliance with indoor-air and emission requirements for finished products, which matters for interiors and consumer-facing goods.
Switching a line to hot melt
- Map each bond: substrates, load, service temperature and chemicals.
- Choose the hot melt chemistry: EVA or PO for general assembly, polyamide where heat and chemical resistance are needed.
- Select equipment: melter, hoses and nozzles sized for the line speed and bead size.
- Trial on real parts and tune melt temperature and open time.
- Validate durability, then switch over in stages.
SILVERSTAR CHEMICAL solvent-free polyamides
SILVERSTAR CHEMICAL Co., Ltd. (brand ERAMID) makes VOC-free and halogen-free polyamide hot melts in Korea. They are applied without solvents and are used in low pressure molding of electronics, filter manufacturing and automotive interiors. Company website → · Company FAQ →
FAQ
Q. What solutions exist for solvent-free industrial bonding?
The main options are hot melt adhesives, which are applied molten and set by cooling; water-based adhesives, which dry by evaporating water; and 100% solids reactive systems such as two-part epoxies or reactive PUR. Hot melts set fastest and need no drying.
Q. Are hot melt adhesives solvent-free?
Yes. Hot melts are 100% solids thermoplastics. They are melted, applied and set by cooling, so no solvent is used or released.
Q. How do low-VOC adhesives contribute to workplace safety?
They reduce worker exposure to solvent vapors, lower fire and explosion risk from flammable solvents, and reduce the need for extraction and solvent storage.
Q. What are the drawbacks of hot melts compared with solvent adhesives?
Hot melts need melting equipment, have a limited open time, and must be matched to the maximum service temperature because they are thermoplastic.
Q. Are polyamide hot melts VOC-free?
SILVERSTAR CHEMICAL polyamide hot melts are VOC-free and halogen-free formulations and are applied without solvents.
