Eco Resin vs Epoxy Resin: Which Is Better for India?

The eco resin vs epoxy question is one of the most common decisions facing Indian studio makers right now. Both materials produce cast objects. The chemistry, the safety profile, the cost per finished piece, and the long-term behaviour of the cured material are different enough that the right answer depends on what you are actually making and where.

I'm Anirudh, founder of Artriso. We make CALSO ONE, a water-based eco resin made in Hyderabad. This comparison is written by someone with a financial interest in eco resin, and I want you to read it with that in mind. What I can promise is that the epoxy numbers are accurate and the cases where epoxy is genuinely the better material are stated plainly.

What you are actually comparing

Eco resin (CALSO ONE and similar mineral-acrylic casting compounds) is a water-based system. You mix powder with water, the acrylic binder activates, and the mineral filler cures into a hard, matte, stone-like solid. No solvents. Minimal VOC emission. The chemistry that makes it cure is the same chemistry used in exterior architectural coatings, which is why it is stable indoors long-term.

Epoxy resin is a two-component thermoset polymer. You combine a resin with a chemical hardener, the exothermic reaction begins, and the mixture crosslinks into a hard solid. Epoxy produces a glass-clear, high-gloss finish. It also produces bisphenol-A and amine fumes during the reaction, which is why PPE is not optional.

Both produce durable finished pieces. The differences are in the workflow, the safety requirements, the finish type, the cost per piece, and what happens to the colour over time.

Safety and VOC comparison

This is the factor that matters most for Indian studio makers working indoors.

Eco resin has negligible VOC emission. The water carrier evaporates during cure, and the acrylic binder reaction produces no significant off-gassing. You need basic ventilation: an open window or a fan moving air is sufficient. No respirator, no chemical gloves required for normal production use. This makes it genuinely suitable for apartment studios, shared workshops, and any setting where a teenager or student might be present.

Epoxy resin generates fumes from two sources: the amine hardener (which off-gasses during mixing and the early cure window) and the residual bisphenol chemistry. Epoxy fumes cause headaches and respiratory irritation at concentrations well below the odour threshold. The fact that you can smell it does not mean you have inhaled enough to cause harm; the fact that you cannot smell it does not mean the air is safe. Epoxy requires an organic vapour respirator (not a dust mask), nitrile gloves, and a dedicated ventilated workspace. Running a full production day on epoxy in a standard Indian flat is not safe practice.

The PPE cost is real: a proper half-mask organic vapour respirator runs ₹2,000 to ₹4,000, nitrile gloves add ₹3 to ₹5 per session, and cartridge replacements add ongoing cost. These are not overhead items that disappear; they are per-production costs.

Cost per piece: a worked example

The comparison that changes how most studios think about epoxy vs eco resin is not the per-kilogram price. It is the cost per finished piece once all inputs are counted.

Take a standard round coaster: 90 mm diameter, 8 mm fill depth.

Volume: approximately 50 cm³. At eco resin's mixed density of roughly 1.6 g/cm³, the pour takes about 80 grams of mixed material. At a 3:1 ratio, that is 60 grams of CALSO ONE Off White powder and 20 grams of water.

CALSO ONE Off White at the 1 kg pack is ₹499. Sixty grams of powder from a 1 kg pack costs ₹30 per coaster in raw resin. At the 6 kg studio pack (₹466/kg), that drops to ₹28.

For the same coaster in epoxy resin: 80 grams of total mixed epoxy, using a mid-range Indian craft epoxy at ₹800 per kilogram, is ₹64 in raw resin. Add the per-session PPE allocation (gloves, respirator amortised over sessions), and the real cost per coaster in epoxy is ₹80 to ₹90.

Eco resin coaster: roughly ₹30. Epoxy coaster: roughly ₹80 to ₹90. At 500 coasters per month, that is a ₹25,000 to ₹30,000 annual saving in material cost alone.

The per-kilogram price headline hides the per-piece truth.

Production speed

Eco resin demoulds in 45 to 60 minutes for thin coasters. You can run three to four production cycles in a working day. Full cure is 24 hours.

Epoxy resin requires a minimum 12 to 24 hours before demould for most Indian craft formulations, and 48 to 72 hours for full cure. One cycle per day per mould set, assuming you let it run overnight. Studios running on epoxy either need a large mould inventory or accept a slow production cadence.

For volume-based studio production, eco resin's short demould cycle is a practical advantage that shows up in output per square foot of studio space.

Yellowing over time: the epoxy problem

This is the factor that most Indian studios discover 12 to 18 months into their first epoxy-based product range, and it surprises them every time.

Standard epoxy resin yellows when exposed to UV light. In Indian conditions, that means indirect window light, fluorescent overhead lighting, and any product displayed in a retail or gifting context. The yellowing is chemical: UV radiation breaks down the amine hardener residue in the cured resin, producing a progressively deeper amber tint. It is irreversible. A coaster that was a clean translucent white in January can read a noticeable cream-yellow by December, without ever being placed in direct sunlight.

UV-resistant epoxy formulations exist but add cost and do not eliminate the effect, they only slow it.

Eco resin (mineral-acrylic) does not yellow. The cured CALSO ONE Off White colourway is the same colourway 18 months later that it was on demould day. The pigment stability is the same. This is why matched-set commissions, tile installations, and gifting sets that need to match across batches produced months apart are reliably done in eco resin, not epoxy.

Finish and aesthetic

Epoxy's natural finish is glass-clear, high-gloss. This is the right finish for river tables, resin art with embedded objects, transparent jewellery, and applications where the material is meant to look like liquid glass.

Eco resin's natural finish is matte, mineral, slightly textured at the micro level. It photographs as stone or ceramic. It is the correct finish for the current dominant aesthetic in Indian handmade decor: coasters, trays, planters, bookends, and small interiors objects where the brief is "natural and handcrafted" rather than "glossy and industrial".

These are not better and worse. They are different aesthetic languages for different products.

The full comparison

Which one is right for your work?

Eco resin is the right material if you are producing coasters, trays, planters, decor objects, or gifting pieces with a matte or mineral finish. If your studio is indoor, your production is volume-based, or you run workshops with students, eco resin is the obvious choice on safety, cost, speed, and long-term colour stability.

Epoxy is the right material if your work requires a glass-clear or high-gloss finish, you are embedding objects in a deep transparent pour, or you are producing river tables and furniture-grade applications. These are legitimate epoxy applications with no eco resin equivalent. If this is your work, use epoxy properly: with a real respirator, real ventilation, and the correct PPE for every session.

The full primer on eco resin chemistry, formats, and the Indian market is in the complete eco resin guide. The full CALSO ONE collection is the starting point if you are ready to try eco resin in your studio.

Frequently asked questions

Is eco resin actually cheaper than epoxy in India?

Per kilogram, eco resin and craft epoxy are broadly comparable, with eco resin typically slightly below mid-range epoxy. The real cost difference shows at the per-piece level. A standard round coaster in CALSO ONE costs roughly ₹30 in raw resin. The same coaster in craft epoxy costs ₹64 to ₹90 once you include PPE allocation. The gap grows with volume. At 500 coasters per month, the annual saving in material cost exceeds ₹25,000.

Does eco resin yellow like epoxy?

No. CALSO ONE and mineral-acrylic eco resins do not yellow. The cured colour is stable under UV exposure and ambient light because the chemistry does not include the amine hardener residues that drive epoxy yellowing. Standard epoxy resin yellows visibly in 6 to 18 months of typical indoor use. UV-resistant epoxy formulations slow the process but do not stop it.

Can I use epoxy resin techniques with eco resin?

Most technique skills transfer directly: mixing pigments during the slurry stage, marbling, layered pours, and sealing all work the same way. The things that do not transfer are deep transparent pours (eco resin is opaque by nature, not clear), extremely long pot life techniques (eco resin has 12 to 15 minutes, not hours), and any finish that requires optical clarity. For matte decorative work, Jesmonite tutorials and most eco resin video tutorials are directly applicable.

Is eco resin safe for workshops with students?

Yes. Eco resin's minimal VOC emission and no-respirator requirement make it the standard material for teaching studios and any workshop setting where a duty of care applies. This is one of the practical reasons Indian workshops, adult craft classes, and school-adjacent making programmes have moved from epoxy to eco resin over the past three years.

Anirudh Rapole is the founder of Artriso, the Hyderabad studio behind CALSO ONE. Questions about switching from epoxy to eco resin? Email contact@artriso.com.