What standards cover
National standards for tea in China come in two kinds, and the distinction is the first thing worth understanding.
Mandatory standards carry the prefix GB and set the safety limits that no product may exceed.
Product standards carry the prefix GB/T, which means recommended rather than compulsory, and most tea standards are these.
A product standard for oolong defines the categories it recognises, then sets requirements for each one.
It will specify moisture, ash, water extract and other measurable things, and it gives sensory terms to use.
The sensory section lists what the leaf, liquor, aroma, taste and infused leaf should be like at each grade.
Contaminants are handled elsewhere, in GB 2762, and pesticide residues in GB 2763, both of which are mandatory.
Labelling is covered by its own standard, so what a package may claim is controlled separately.
Every product standard is numbered, and the number a tea was made to often appears on the package.
You can look that number up in the national standards library, which is public and free to search.
What they do not cover
What a standard will not tell you is whether the tea is good, because that is not what it is for.
It sets a floor rather than a ranking, and a tea that meets every requirement can still be dull.
Origin claims are mostly outside the product standard, unless there is a separate geographical indication standard.
Tree age, single garden, first flush and similar market terms have no standing in the standard at all.
Age is the clearest gap, since very few standards say anything useful about how long a tea has been stored.
Brewing method is not covered either, so any parameter on the packet is the seller’s advice, not a requirement.
The sensory terms in a standard are minimums described in words, and two graders can read them differently.
Organic, wild and similar claims belong to other certification systems and are not part of the standard.
A standard also cannot tell you whether a particular batch was stored well in a particular warehouse.
Treat compliance as the entry ticket, and treat everything else as something you have to judge yourself.
Grades in practice
Grades in the oolong standard run from a special grade downwards, usually through one, two and three.
Each grade sets out what the dry leaf, liquor, aroma, taste and infused leaf should look and feel like.
The measurable numbers move very little between grades, because they are floors rather than targets.
So a difference of one grade is often a difference in appearance and evenness rather than in the cup.
Grade is assigned within a batch, which means it compares a tea against its own lot and nothing else.
In practice the producer grades the tea, and there is no independent check on that most of the time.
Packaged gift tea is where grade inflation shows up most, since the printed label is rarely challenged.
Loose tea sold by weight may carry no grade at all, which tells you nothing either way.
A higher grade usually buys you tidier leaf and a cleaner aroma, and not necessarily more flavour.
Read the grade as one clue about how a batch was sorted, then taste the tea and decide for yourself.
Safety versus quality
Safety and quality are two separate systems, and confusing them is the commonest mistake buyers make.
Safety limits are mandatory, with contaminants set in GB 2762 and pesticide residues set in GB 2763.
Quality requirements, including grade, sit in the recommended GB/T standard, which nobody is obliged to meet.
A tea can therefore be perfectly safe and quite poor, or excellent and sold with no standard number at all.
Labelling rules require the producer to be identifiable, which is the most useful thing on any package.
If a package names no manufacturer and no standard, there is nobody to ask and nothing to check.
Home test kits for pesticides are unreliable, and a clear result from one of them means very little.
The practical route is to buy from sellers who can produce a test report for the batch in question.
Moisture is the safety-adjacent figure to watch, because damp tea is where storage problems begin.
Think of safety as a floor you verify once, and quality as something you taste every single time.