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MR. JO JR 3010 — Lower-viscosity unmodified epoxy resin for better wetting and easier dilution

JR-3010 is an unmodified BPA epoxy resin with EEW 180–188 and viscosity 8,000–11,000 mPa·s. It sits below JR 3000 in viscosity: an attractive option where degassing, pumpability and lower need for diluent are priorities — yet it still provides a predictable EEW baseline comparable to YD127.

The problems JR 3010 is designed to solves

• Excessive diluent use: formulators and makers sometimes add reactive diluents simply to reach pumpability or casting viscosity. That can alter cure behaviour and final properties. JR 3010’s lower native viscosity reduces the need for dilution.
• Bubble retention & poor wetting: higher-viscosity resins can trap bubbles and struggle to wet fibers or substrates fully. JR 3010 improves substrate wetting and simplifies vacuum or thermal degassing.

Inconsistent shop throughput: when pump lines are marginal or degass steps are slow, JR 3010’s flowability reduces processing bottlenecks and scrap.

Why JR 3010 works (technical advantages)

• Lower viscosity (8–11 k mPa·s) enhances wetting and makes the resin naturally more responsive to vacuum degassing — beneficial for optical casting, potting and laminates.
• EEW 180–188 provides a familiar stoichiometric baseline for formulators; it responds predictably to common hardener classes.
• Less need for reactive diluent: because JR 3010 is already more fluid, formulators can preserve resin chemistry and reduce variables introduced by high diluent loading.
• Pack sizes: 10/20/30 kg packs and barrels mean small shops can run trials and pilots without the waste and handling issues of large drums.

Job-ready workflow (practical)

1. Material conditioning: bring resin & hardener to 20–25 °C. Lower viscosity at hotter temps reduces pot life — monitor closely.
2. Hardener selection: pick a curing agent per required pot life, Tg and colour stability. Hardener choice will control cure kinetics and long-term yellowing.
3. Measure & mix: weigh accurately; mix Part A + Part B thoroughly. Because JR 3010 is less viscous, mixing is easier but still avoid aggressive whipping.
4. Degas: for optical parts, vacuum-degass small batches; for larger pours use staged pours or a thin seal coat approach.
5. Pour / wet out / pot: pour slowly from one side to displace air; for laminates use rollers and vacuum bagging to improve consolidation.
6. Cure & post-cure: follow hardener TDS. For maximum clarity and thermal performance, employ recommended post-cure cycles.
7. QC & record: log batch size, ambient conditions and mix weights for reproducibility.

Formulation & handling tips

• Reactive diluents are optional: you’ll often need less or none; if added, choose reactive types to avoid weakening cured network.
• Temperature management: JR 3010 flows more at elevated temp — balance component temp for consistent pot life and pour behavior.
• Degassing advantage: lower viscosity equates to faster gas bubble rise — fewer trapped microbubbles in cured parts.
• Pigments & fillers: pre-disperse pigments into a small resin portion for uniform color; coated fillers reduce spotty appearance.
  

Troubleshooting

• Excessive thinning (too runny): check component temperatures and diluent levels. Lower temp or less diluent to raise viscosity.
• Short pot life when warm: batch too large or ambient high — reduce batch size, or choose a slower hardener.
• Persistent microbubbles: increase degas time, reduce mixing speed, or perform staged pours with seal coats.
• Surface tack / under cure: verify mix ratio and cure temperature.
  

Safety & storage

Standard epoxy precautions: nitrile gloves, eye protection and adequate ventilation. Store sealed, cool and dry. Small pack sizes make inventory rotation simple and reduce the risks associated with large opened drums.

Choose  JR 3010 when you want a lower-viscosity, unmodified epoxy that reduces the need for dilution, improves wetting and simplifies degassing — ideal for casting, potting and laminating processes where flow and clarity are important. Its EEW and handling profile make it a practical alternative to JR 3000 when fluidity and fewer process additives are the objective.