MR. JO Modified Epoxy Resins — Selector Guide (viscosity: high → low)
MR. JO Modified Epoxy Resins — Selector Guide (viscosity: high → low)
Use: pick by required rheology first (bead/hold vs flow/degas), then match diluent chemistry (aliphatic vs aromatic, mono vs di) to the end-use (weathering, chemical resistance, Tg).
| Grade (link) | EEW (g/eq) | Viscosity @25 °C (mPa·s) | Modifier / reactive diluent | Colour / Density | Primary applications | Near / comparable grade (soft wording & link) |
| JR 3011 | 180–200 | 4,500–6,500 | Mono-functional aliphatic R-diluent | Gardner ≤0.5; Density 1.10–1.18 g/cc | High-solid coatings, waterproofing (moderate body / hold) | Comparable handling to Araldite GY-255 (analog). |
| JR 5124 | 175–182 | 1,500–2,300 | Bi-functional reactive diluent | Gardner ≤2; Density 1.01–1.12 g/cc | Self-levelling floorings, solvent-free coatings, concrete bonding, potting & composites | Near equivalent: Spolchemie CHS-EPOXY 531. |
| JR 3012 | 185–210 | 1,200–1,800 | Mono-functional aliphatic R-diluent | Gardner ≤0.5; Density 1.10–1.15 g/cc | High-solid coatings, primers, mortars, flooring | Comparable in behaviour to YD-510 (analog). |
| JR 5126 | 185–200 | 1,000–1,500 | Di-functional aliphatic R-diluent | Gardner ≤2; Density 1.10–1.15 g/cc | Filament winding, composites, RTM, pultrusion (low visc + higher crosslink potential) | Comparable with YD-535LV (analog). |
| JR 4125 | 195–205 | 900–1,200 | Mono-functional aliphatic R-diluent | Gardner ≤0.5; Density 1.05–1.15 g/cc | Casting, coatings, civil applications (balanced flow & gloss) | — |
| JR-3018 | 185–195 | 850–1,000 | Mono-functional aromatic R-diluent | Gardner ≤1; Density 1.05–1.15 g/cc | Chemical-resistant coatings, high-solid coatings, grouts, mortar | Comparable with Aditya Birla YD-508 (analog). |
| JR 3005L | 190–210 | 750–900 | Mono-functional aliphatic R-diluent | Gardner ≤0.5; Density 0.95–1.05 g/cc | Self-levelling floors, adhesives, construction chemicals, flowable mortars | Comparable with YD-515 (analog). |
| JR 5857 | 196–204 | 600–900 | Mono-functional reactive diluent | Gardner ≤2; Density 1.05–1.15 g/cc | Laminating, potting/encapsulation, self-levelling floors, coatings, gap sealing | Near equivalent: Spolchemie CHS-EPOXY 521. |
| JR 3016 | 190–200 | 550–800 | Mono-functional aliphatic R-diluent | Gardner ≤0.5; Density 1.0–1.1 g/cc | Adhesives, topcoats, flooring (ultra-low dilution need) | — |
| JR 3017 | 180–190 | 500–700 | Mono-functional aromatic R-diluent | Gardner ≤1; Density 1.0–1.1 g/cc | Self-levelling flooring, adhesives, civil grouts, mortars | Comparable with YD-128 / Araldite GY-257 (analogs). |
| JR 3013 | 185–195 | 250–500 | Mono-functional aliphatic R-diluent | Gardner ≤0.5; Density 1.0–1.1 g/cc | Tile grout, primers, thin coatings (ultra-low viscosity, best degas) | Comparable with Araldite GY-9513 (analog). |
How to use this selector (practical rules)
- Pick by rheology first
- Need edge-hold / bead retention / vertical application → start at the top (JR 3011, JR 5124).
- Need balanced flow + some hold → middle band (JR 3012 → JR 4125 → JR 3018).
- Need max flow / fastest degas / optical or thin film → lowest band (JR 3013, JR 3017, JR 3016).
- Pick modifier chemistry next
- Mono-functional aliphatic → lower tint, better outdoor weathering (good for floors, clear coatings).
- Di-functional aliphatic → lower visc + higher cured Tg; good where higher crosslink density is needed (JR 5126).
- Aromatic mono → higher chemical resistance and Tg tendency, but may show higher tint (JR 3017, JR 3018).
- Plan diluent strategy
- Prefer reactive diluents (already present in these grades) when you must preserve cured network strength; avoid heavy non-reactive thinning for structural/industrial grades.
- Hardener choice controls the final cure
- Pot life, Tg and yellowing are primarily governed by the hardener class; always validate the resin + hardener pairing under your process conditions.
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