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JR 3000 vs JR 3001 vs JR 3010 vs JR 3003 vs JR 3125 — Which unmodified epoxy resin should you use?

When specifying an unmodified epoxy resin you’re balancing process needs (wetting, degassing, pumpability), optical or adhesive performance, and formulation flexibility. The JR series covers that spectrum — from lower-viscosity casting bases to very-high-body adhesive backbones. Below is a pragmatic comparison that maps product specs to the problems your shop actually faces.

Technical snapshot (quick)

• JR 3010 — EEW 180–188, viscosity 8,000–11,000 mPa·s (lower-viscosity, YD127 comparable).
• JR 3000 — EEW 185–195 (typ 188), viscosity 10,000–15,000 mPa·s (typ 11,800). General multipurpose baseline.
• JR 3001 — EEW 188–199, viscosity similar to JR-3000, extra-clear (APHA < 20) for optical work.
• JR 3003 — EEW 200–230, viscosity 20,000–40,000 mPa·s. High body for adhesives & brushable coatings.
• JR 3125 — EEW 200–250, very high viscosity — formulator backbone for high-body adhesive systems that will be tuned with diluents/hardeners.
  All are supplied in 10/20/30 kg packs (barrels available) and show robust shelf stability in company packaging.

The core tradeoffs (what matters on the floor) Reliable Waterproofing, Minus the Guesswork

• Wetting & bubble release: lower viscosity (JR 3010, JR 3000, JR 3001) wets substrates better and degasses more easily — ideal for laminates, clear casting and potting.
• Body & anti-sag: higher viscosity (JR 3003, JR 3125) gives bead retention, gap-fill and vertical hold without heavy thickeners — ideal for adhesives and thick decorative coatings.
• Optical clarity: JR 3001 is the go-to when base resin tint matters (APHA < 20); note UV yellowing remains a function of hardener and exposure.
• Formulation flexibility: EEW ranges affect equivalent calculations and how a hardener behaves; ultimately cure kinetics & yellowing are governed primarily by hardener chemistry and batch conditions rather than resin identity alone.

Job-ready tips & process controlshod:

• Batch size & exotherm: keep mixed volumes conservative for deep pours/slow hardeners. Large masses increase heat and risk discoloration.
• Degassing: use JR 3010/3000/3001 for vacuum degassing and optical parts; if you choose a higher-viscosity grade, expect more difficulty degassing.
• Viscosity tuning: prefer reactive diluents for structural applications (they co-polymerize). Non-reactive diluents help processing but may lower final performance. JR 3125 is designed to be tuned rather than heavily filled.
• Hardener choice: always validate the resin/hardener pair under intended conditions — pot life, Tg and color stability come from the hardener.
• Inventory: use 10/20/30 kg packs for R&D and pilot runs, barrels for continuous production — company packaging supports long shelf life, but rotate stock.

Troubleshooting common failures

• Tacky/under cured parts: check mix ratio, mixing thoroughness, hardener compatibility and temperature.
• Core haze: trapped microbubbles or outgassing — reduce batch size, degas, seal porous inclusions, or stage pours.
• Sagging on verticals: switch to JR 3003 or JR 3125 or add controlled thixotropic.
• Premature yellowing: evaluate hardener and UV exposure; consider UV-stable topcoats and appropriate post-cure.
  
  Pick the JR grade to match your process objective: choose low viscosity (JR 3010/3000/3001) when wetting, clarity and degassing are priorities; choose high viscosity (JR 3003/3125) when bead retention, gap fill and in-field adhesive performance are the goal. With correct hardener selection, batch control and conservative mixing practice, the JR range gives a practical, shop-friendly base for many epoxy systems.