Indonesian Coffee Grading: SCA Vs SNI 2026 Buyer Guide

A practical, field-tested method to translate Indonesian SNI grades into SCA-ready purchase specs. Includes defect mapping logic, screen size and moisture/water activity targets, and a copy‑paste spec clause you can use today.

We went from recurring buyer claims to near-zero in 90 days using one simple shift. We stopped arguing “SNI Grade 1 vs SCA specialty” in theory and started writing purchase specs that bridge both systems in practice. This guide shows exactly how we do it for customers every week.

The 3 pillars of translating SNI to SCA (2026-ready)

Defects: SNI is a total-defect-value system on a 300 g sample. SCA is category-based on a 350 g sample. There’s no perfect conversion, so you must recount to SCA on 350 g before booking. We use SNI as the factory control and SCA as the buyer-facing gate.
Size and prep: Indonesia commonly trades by SNI screen 16 and 18. That’s the same as 16/64 and 18/64 inches. SCA doesn’t mandate size for specialty, but buyers typically want 16+ or 17/18 to stabilize roast and reduce quakers.
Moisture and water activity: SNI certificates often accept up to around 12.5–13.0% moisture. SCA green standards target 10.0–12.0% moisture and water activity ≤ 0.70. For wet-hulled Sumatra lots, we’ve found wa ≤ 0.65 dramatically reduces mold risk on long ocean routes.

Practical takeaway: Use SNI to control production and sorting at origin. Use SCA to lock final acceptance. Tie both into the same contract.

Week 1–2: Draft a dual-standard spec (with sample clause)

Here’s the copy-paste clause we recommend buyers put in POs. Tweak to your needs.

Origin/lot: [e.g., Sumatra Lintong, Grade 1] 2025/26 crop.
SNI physical: Grade 1 per prevailing SNI green standard using 300 g sample. Exporter to provide defect sheet and screen analysis by 16/18.
SCA physical: 350 g recount per SCA Green Arabica Grading Protocol. 0 Category 1 defects. ≤ 5 Category 2 defects.
Size: Minimum 90% screen 16 up. Specify 17/18 for high-uniformity SKUs when needed.
Moisture: 10.0–12.0% (Sinar or equivalent). Water activity: ≤ 0.70 at 25 °C. Target 0.52–0.62 for wet-hulled.
Cup: SCA score ≥ 82 by Q Grader. Provide PDF cupping form, roast color, and water spec. Buyer reserves the right to verify in a second lab.
Sampling: Pre-contract sample and PSS both to be evaluated to this spec. Final acceptance on PSS unless outturn deviates by >1 point or fails physicals.
Tolerance and AQL: Apply ANSI/ASQ Z1.4 AQL 2.5 at stuffing. Non-conforming bags segregated or replaced.
Traceability: Provide lot code, mill, elevation band and process. State “wet-hulled” where applicable.

Need help tuning this for your SKU or route risk? If you want our template with drop-down defect reasons and pass/fail logic, Contact us on whatsapp.

Week 3–6: Validate with real samples (don’t trust labels)

Here’s the thing. Labels like “SNI Grade 1” or “Specialty” are starting points, not guarantees. In our experience, three out of five new buyers discover a gap only when they recount defects on 350 g.

Always request two samples: a pre-contract sample and a Pre-Shipment Sample (PSS). Recount both using SCA’s 350 g method. If you’re buying Sumatran wet-hulled, request an extra PSS after monsoon rains.
Align on screen size up front. If your espresso program needs 17/18 uniformity, say it. For filter roasts you can often accept 16 up if moisture and wa are tight.
Record moisture and water activity on both sides. We log both at origin and at your lab because marine transit raises wa slightly. If a lot sits in humid ports, a 0.60 wa can creep to 0.66 by arrival.

If you want easy wins during this window, test hardware and roast quickly. You’ll catch sensory or defect drift before containers move.

Week 7–12: Scale and lock your acceptance logic

Once the spec passes twice, scale the logic across bookings.

For multi-container programs, use a rolling average: accept small variance in moisture (±0.3%) and cup (±0.5 points) if the run stays within spec and zero Category 1 defects are maintained.
Implement a simple AQL check at stuffing. Pull 2–3% of bags randomly. If any fail SCA physicals, re-sort or replace before sealing.
Keep a “moisture/wa plus process” matrix. Wet-hulled lots require tighter wa limits than fully washed. Naturals from Bali can ride closer to 0.65 safely if moisture is ≤ 11.5% and bags are grainpro-lined.

This is where good Indonesian partners shine. We pre-grade to SNI for efficiency, then surface SCA counts transparently so you don’t have surprises.

Common questions we get from buyers

What does SNI Grade 1 actually mean compared to SCA specialty?

SNI Grade 1 is a physical grade based on a 300 g sample and a total defect-value threshold. In market practice, Grade 1 often means a total defect value around 0–11. SCA “specialty” requires a 350 g count of 0 Category 1 defects and ≤ 5 Category 2 defects, plus an SCA cup score ≥ 80. So SNI Grade 1 can be compatible with specialty, but it’s not automatic.

How do I translate SNI defect counts into SCA primary and secondary defects?

There isn’t a one-to-one formula. SNI tallies weighted defect values; SCA separates Category 1 and 2 defects by type. The only reliable method is to recount the very same sample using SCA’s 350 g protocol. As a working rule, lots that test well below the SNI Grade 1 ceiling and show very few blacks/sours usually pass the SCA physical. If an SNI Grade 1 sits near the cutoff, treat it as borderline and verify with a 350 g recount.

Can a coffee labeled SNI Grade 1 still score below 80 on SCA cupping?

Yes. Physical grade and cup quality correlate but don’t guarantee each other. We see clean Grade 1s that cup 78–79 and, conversely, 82-point lots with a couple of extra secondary defects that miss specialty on the physical.

Is SNI screen size 18 the same as SCA 18/64?

Yes. SNI screen numbers are the same 64th‑inch screens used globally. So “screen 18” equals 18/64. Indonesia commonly trades 16 up, 17/18, or 18 up.

What moisture or water activity limits should I require for Indonesian green coffee?

For Arabica, specify 10.0–12.0% moisture and water activity ≤ 0.70. For wet-hulled Sumatra lots, we recommend ≤ 0.65 wa. For Robusta, many buyers run 10.5–12.5% moisture with wa ≤ 0.70. The trend we’re seeing in the last 6 months is more buyers requiring water activity on the COA, not just moisture.

How do I sample and inspect an Indonesian lot to verify SNI and SCA compliance?

Sample size: SNI physicals on 300 g at the mill. SCA recount on 350 g in your lab or by a Q Grader at origin.
Documents: Ask for SNI defect sheet, SCA 350 g recount, screen distribution, moisture and wa readings, and a Q Grader form with an 80+ score if buying specialty.
Pre-shipment inspection: At stuffing, apply an AQL sample. Confirm bagging, liner use, lot codes, and that moisture/wa readings match the PSS within tolerance.

A practical mapping you can use today

Use SNI Grade 1 to filter lots efficiently. Then mandate a 350 g SCA recount and an 80+ cup for acceptance. If you must pre-screen quickly from paperwork, target SNI Grade 1 lots that test at least 20–30% below the Grade 1 defect ceiling.
Lock screen 16 up for filter programs, 17/18 for espresso programs sensitive to roast time and quakers. If you need a guaranteed uniformity for signature offerings, specify 90% 17/18.
Require moisture and water activity on the COA. If you ship during monsoon or through high-humidity transshipment hubs, tighten wa by 0.03–0.05.

Examples from our current catalog

Need a clean, fully washed Grade 1 baseline? Our Arabica Java Ijen Grade 1 Green Coffee Beans ship with screen and SCA recount on request. High, clean acidity. Great for 16 up filter programs.
Building a chocolate-forward espresso? Sumatra Lintong Green Coffee Beans (Lintong Grade 1) provide classic body and pass physicals consistently when wa is controlled.
Want a differentiated SKU with natural size uniformity? Sumatra Super Peaberry Green Coffee Beans are hand-sorted peaberries. Still run the SCA 350 g check, but you’ll see fewer broken/chipped issues.

You can browse additional origins and processes here: View our products.

5 mistakes that create expensive claims (and how to avoid them)

Assuming SNI Grade 1 equals specialty. It doesn’t. Always require an SCA 350 g recount and an 80+ cup for lots sold as specialty.
Skipping water activity. Moisture alone isn’t enough for wet-hulled coffees. Add wa and tighten it in humid seasons.
Vague size language. “Large beans” isn’t a spec. Specify “≥90% screen 16 up” or “17/18 with tolerance.”
Accepting PSS without roast/cup context. Request roast level, grinder and water spec on the cupping form so you can replicate results.
No AQL at stuffing. A quick random pull on loading day saves weeks of emails later.

Resources and next steps

Use the spec clause above in your next PO. If you’re moving wet-hulled Sumatran coffees like Sumatra Mandheling Green Coffee Beans, set wa ≤ 0.65.
Ask your exporter for both SNI and SCA physical sheets. Compare the same PSS lot under both systems. If they can’t provide both, that’s a red flag.
Need a second set of eyes on your spec or a fast SNI-to-SCA translation for an active PO? Contact us on whatsapp and we’ll send our working templates.

Final thought: Don’t try to “convert” SNI to SCA with a clever formula. Use SNI to control the factory reality and SCA to protect your brand promise. When both are in your contract and your sampling, shipments get boring in the best possible way.