Indian Green Coffee Grading Standards: Plantation AAA, AA, PB & Robusta Kaapi Royale Guide
1. How the Coffee Board of India Classifies Green Coffee
Unlike Colombian (Supremo/Excelso) or Kenyan (AA/AB) systems alone, the Coffee Board of India uses a dual-matrix nomenclature combining post-harvest processing method (Plantation vs. Cherry) with mechanical sieve aperture retention (AAA, AA, A, AB, PB, C, and Bulk/Triage) and strict visual defect equivalence limits.
Whether you source shade-grown S.795 and Chandragiri Arabica from Baba Budangiri (Chikmagalur), Coorg Old Kent lots, Biligirirangana Hills micro-lots, or high-density CxR Robusta from Wayanad, every curing works in India grades cured green beans using standardized brass test sieves.
In Indian coffee trade terminology, “Plantation” always denotes wet-processed (washed) Arabica parchment, whereas “Cherry” denotes dry-processed (natural/unwashed) whole fruit dried on estate patios or raised beds. For Robusta, wet-processed lots are termed Robusta Parchment (headlined by the globally coveted Kaapi Royale), while dry-processed lots are sold as Robusta Cherry.
2. Complete Sieve Size, Tolerance & Grade Specification Table
Under official Coffee Board of India specifications, flat beans are graded using circular perforated screens, while round single-seeded ovules (Peaberry / PB) are separated first using slotted screens (3.95 mm to 4.25 mm slots). Below is the master engineering reference for Indian specialty and commercial grades:
3. Interactive Green Coffee Lot Sieve Yield & Defect Cost Adjustment Calculator
4. Defect Equivalents, Roast Thermodynamics & ERP Traceability
Why does screen size uniformity matter so deeply once green beans leave the curing works and enter your roastery? During the initial 4 minutes of conductive drum contact, heat flux into a coffee bean scales inversely with its radius squared ($r^2$). If a lot labeled “Plantation A” contains 9% undersized broken bits and shells (Triage), those low-mass fragments reach 210°C early, charring into bitter polycyclic aromatic compounds that taint the entire batch with ashy astringency.
- Grade-Specific Roast Profile & Shrinkage CalibrationHigh-density Screen 18 Plantation AAA and dense Peaberry (PB) lots require higher initial charge energy and distinct airflow curves compared to porous Monsooned Malabar AA. Link incoming lot sieve grades directly to drum profiles inside the BeanTrack Roast Profile & Blend Recipe Engine.
- Dock Weighbridge & Moisture GatekeepingLog sieve test percentages, defect outturn deductions, and moisture readings at dock intake using BeanTrack Live Stock & Warehouse Visibility and compare subscription tiers on our Roastery ERP Pricing page.
Frequently Asked Questions (FAQ)
What is the difference between Plantation AAA, AA, and A in Indian Arabica coffee?
Indian washed Arabica is classified as Plantation coffee and graded by mechanical sieve screen aperture size (in 1/64th of an inch). Plantation AAA is retained on Screen 18 (7.10 mm), Plantation AA on Screen 17 (6.70 mm), and Plantation A on Screen 16/15 (6.30–6.00 mm) with strict limits on peaberry and triage content.
What makes Indian Robusta Kaapi Royale different from Robusta Cherry AB?
Robusta Kaapi Royale (RKR) is India’s flagship washed Robusta Parchment grade, retained on Screen 17 (6.70 mm) with zero primary defects, delivering a clean, creamy espresso body. Robusta Cherry AB is natural-processed coffee retained on Screen 15 (6.00 mm) with a wider defect tolerance.
What are the official Coffee Board of India moisture limits for green coffee?
Washed Arabica (Plantation) and washed Robusta Parchment must maintain a moisture content between 10.0% and 12.0% (ideal specialty target 10.5%–11.5%). Monsooned Malabar AA is permitted up to 13.0%–14.5% due to coastal monsoon wind curing.
Why does mixing screen sizes (like Plantation A with Triage) ruin specialty drum roasting?
Small broken triage fragments (under Screen 14) have a fraction of the thermal mass of Screen 18 beans; when roasted together, the small fragments scorch and carbonize before the large dense beans complete Maillard development inside their cores.