Brewing Standards
Sources: The Coffee Brewing Handbook by Rob Lingle (SCA, 2011)
The Specialty Coffee Association of America established brewing standards based on research conducted by the Coffee Brewing Institute (CBI, 1952–1964) and Coffee Brewing Center (CBC, 1964–1975), later confirmed and expanded by the Nordic Coffee Brewing Center (Norway). These standards define the measurable parameters that produce a cup in the optimal balance zone of the Coffee Brewing Control Chart. (source: SCA Coffee Brewing Handbook)
The Standards
| Parameter | US/CBC Standard | Nordic/NCC Standard |
|---|---|---|
| Strength (% solubles concentration) | 1.15–1.35% TDS | 1.30–1.55% TDS |
| Extraction (% solubles yield) | 18–22% | 18–22% |
| Brewing formula | 3.25–4.25 oz per 64 fl oz | 60–70 g per liter |
| Brewing temperature | 195–205°F (92–96°C) | 92–96°C |
| Brewing time — fine grind | 1–4 minutes | 1–5 minutes |
| Brewing time — drip grind | 4–6 minutes | — |
| Brewing time — regular grind | 6–8 minutes | — |
| Brewing time — coarse grind | — | 5–8 minutes |
| Holding temperature | 175–185°F (80–85°C) | 80–85°C |
Note: US (foot-pound) and metric measurements are rounded independently, so conversions are approximate. 200°F = 93.3°C; 94°C = 201.2°F — differences are not significant for the recommended range. (source: SCA Coffee Brewing Handbook)
European vs. US Standards
The Nordic (NCC) standard specifies a stronger brew than the US (CBC) standard — 1.30–1.55% TDS vs. 1.15–1.35% TDS. This reflects Scandinavian and Northern European consumer preference for a more intense filter coffee.
The NCC also recommends a higher brewing dose: 60–70 g per liter vs. the US range of approximately 50–60 g per liter (equivalent to 3.25–4.25 oz per 64 fl oz).
Implication for Kaiserblick: European export customers — particularly in Germany, France, Switzerland, the Netherlands — tend toward the Nordic-influenced preference for stronger filter coffee. Kaiserblick should communicate brewing ratios in g/liter and align with the 60–65 g/liter range as a starting recommendation.
Brewing Temperature
Water must reach the coffee bed at 92–96°C throughout at least 90% of the brewing cycle. Equipment that starts at the correct temperature but drops 5–10°C due to insufficient heating capacity fails to extract the full flavour — especially relevant for high-quality specialty coffees.
The recovery time of commercial brewers is also important: a brewer with a 5-minute cycle but 10-minute recovery has a true capacity of 4 batches per hour, not 12.
Temperature affects flavour directly:
- Higher temperature → more acidity, more body, less bitterness/astringency
- Lower temperature → less extraction overall; flatter, thinner cup
Turbulence
Turbulence has three components:
- Wettability: All coffee particles must absorb water uniformly. Channels (dry paths through the coffee bed) create simultaneous over- and under-extraction in different bed zones.
- Bed height: Should be 1–2 inches (2.5–5.0 cm). Less than 1 inch → light, bitter brew (too fast). More than 2 inches → channeling → off-flavours and bitterness.
- Water feed: Must be uniform and cover the entire coffee bed surface — no concentrated streams or dry areas.
When brewing manually (pour-over), pour slowly and in a circular pattern to guarantee complete, even wetting. (source: SCA Coffee Brewing Handbook)
SCAA Brewer Certification Program
The SCAA offers an independent certification program evaluating coffee brewers against these standards. A brewer earns certification by demonstrating it:
- Delivers water at 92–96°C throughout 90%+ of the cycle
- Wets the entire coffee bed in the first 10% of the cycle
- Achieves the correct brewing time for the grind used
- Has a brew basket sized for 9–11g of coffee per 6 fl oz cup
This certification is relevant for Kaiserblick’s coffee shop customers evaluating equipment.
Holding Standards
After brewing, coffee should be held at 80–85°C in a closed, insulated container without direct heat application. See Coffee Freshness for the chemistry of post-brew degradation.
Serving temperature: 70–80°C (155–175°F) — the physiologically and psychologically optimal range for hot beverage enjoyment.