Definition:
Menghai Tea Factory (勐海茶厂 Měnghǎi Cháchǎng), founded in 1940 in Menghai County, Xishuangbanna, Yunnan province, is the most historically significant pu-erh producer in China — a former state-owned enterprise responsible for standardizing pu-erh production, pioneering the ripe pu-erh (shou puerh) pile-fermentation process in the early 1970s, and producing benchmark pu-erh cakes (most notably the 7542 raw and 7572 ripe) against which other productions are measured. Privatized in 2004, the factory now operates under the Dayi (大益) brand and is the world’s highest-revenue pu-erh producer; Dayi cakes are traded on secondary markets as both drinking teas and investment-grade collectibles.
In-Depth Explanation
History
1940: Established by the Nationalist government (Republic of China) as a tea processing facility in Xishuangbanna, leveraging Yunnan’s ancient tea gardens.
1950s–1970s: Under state ownership (People’s Republic), Menghai Factory developed standardized production protocols for pu-erh, including the recipe numbering system used across factories.
Early 1970s: Collaborated with Kunming Tea Factory in developing the wò duī (pile fermentation) process that created ripe pu-erh (shou puerh) — a defining technological innovation in the history of tea.
1970s–1980s: The factory codes 7542 (sheng) and 7572 (ripe) became industry benchmarks. The recipe number system: first two digits = year recipe was developed; third digit = leaf grade (higher = smaller/finer, lower = coarser); fourth digit = factory code (2 = Menghai).
2004: Privatized and acquired by Yunnan Dayi Tea Industry Group (大益茶业集团), which has expanded aggressively.
2010s–present: Dayi operates as the dominant commercial pu-erh brand with international distribution; certain Dayi releases — particularly limited-edition and anniversary cakes — are actively traded on secondary markets, with prices sometimes exceeding ten times face value.
The 7542 and 7572
7542 sheng (raw) pu-erh: A consistent blend of Yunnan maocha compressed into 357g cakes; considered the benchmark for standard sheng pu-erh against which other raw cakes are compared. The recipe prioritizes complexity and aging potential.
7572 ripe (shou) pu-erh: The benchmark ripe pu-erh cake; medium-grade maocha blended and pile-fermented; the reference standard for commercially produced ripe pu-erh smoothness and character.
Other Notable Productions
- Red Mark (紅印), Blue Mark (藍印), Yellow Mark (黃印): Pre-1990s factory productions now highly sought as aged collectors’ items; prices run into tens of thousands of dollars per cake
- Menghai 8582: A popular lightly compressed raw pu-erh used as an affordable aging tea
- V93 tuo cha: A popular loose-form ripe production
Common Misconceptions
“All Dayi (大益) tea is from Menghai Factory.” While Dayi’s flagship operations remain at Menghai, the brand now sources from multiple locations in Yunnan. “Menghai Factory” refers specifically to the original factory and its pre-2004 productions; modern Dayi productions may have different character.