| 1 | Working Time | Enough open time for accurate mixing, leveling, and bubble removal | 5–30 minutes at approximately 21–25°C (70–77°F) | Very short working times can increase mixing errors and surface defects. | Choose a shorter time for small repairs and a longer time for detailed artwork or larger surfaces. |
| 2 | Tack-Free or Demold Time | Reaches a firm, non-sticky surface quickly under recommended conditions | Approximately 2–12 hours | Affects handling, sanding, recoating, and production turnaround. | Check whether the stated time means tack-free, demold, or light-use readiness. |
| 3 | Full Cure Time | Reaches final mechanical and chemical resistance within a predictable period | Approximately 24–72 hours | Fast surface drying does not always mean fast complete curing. | Compare final-cure data separately from initial set or demold claims. |
| 4 | Mixing Ratio | Simple, clearly stated ratio with low tolerance for user error | Common systems include 1:1, 2:1, or 3:1 by volume; some require weight measurement | Incorrect proportions can cause softness, tackiness, or incomplete cure. | Verify whether the ratio is by volume or by weight and use the specified measuring method. |
| 5 | Viscosity and Bubble Release | Low-to-medium viscosity with sufficient time for bubbles to rise | Often about 300–1,500 mPa·s at room temperature, depending on formulation | Lower viscosity improves wetting and bubble release but may reduce control on vertical surfaces. | Match viscosity to the task: casting, coating, bonding, or vertical repair. |
| 6 | Recommended Pour Thickness | Clearly specified thickness limits with guidance for multiple layers | Fast-curing coatings are commonly suited to thin layers of about 1–6 mm; casting limits vary widely | Thick pours can generate excessive exothermic heat, bubbles, cracking, or yellowing. | Never assume a fast coating resin is suitable for deep casting. |
| 7 | Temperature and Humidity Tolerance | Reliable curing within a stated temperature and humidity range | Many systems perform best around 21–25°C (70–77°F) and below approximately 60% relative humidity | Cold conditions slow curing, while high humidity can cause blush, cloudiness, or surface defects. | Compare test conditions with the environment where the resin will be used. |
| 8 | Hardness and Durability | Hard, non-tacky finish with suitable abrasion and chemical resistance | Many cured epoxy systems fall broadly within Shore D 70–85, but test methods differ | Hardness affects scratch resistance, sanding behavior, and long-term surface performance. | Use hardness data together with impact, abrasion, and chemical-resistance information. |
| 9 | Clarity and Yellowing Resistance | Clear appearance with documented UV stabilizers or non-yellowing claims | Performance varies; all epoxy systems can change color with UV exposure and heat over time | Important for artwork, wood projects, jewelry, and transparent encapsulation. | Look for accelerated-weathering data rather than relying only on “crystal clear” wording. |
| 10 | Safety and Documentation | Accessible technical data sheet, safety data sheet, PPE guidance, and application instructions | Look for hazard classification, ventilation guidance, skin and eye protection, storage, and disposal instructions | Epoxy components can irritate skin and eyes and may cause sensitization with repeated exposure. | Prefer products with complete documentation and follow the supplied safety instructions. |