Corks vs screw caps: the real difference
The honest guide to cork vs screw cap — what actually matters, what's myth, and why a screw cap doesn't mean a cheap wine.
The honest guide to cork vs screw cap — what actually matters, what's myth, and why a screw cap doesn't mean a cheap wine.
The 4 chapters
01What the closure actually does
A wine closure has exactly one purpose: control how much oxygen reaches the wine.
Read Step 1 →Cork — what's right, what's wrong
Built for long aging — at a real risk.
Read Step 2 →Screw cap — what's right, what's wrong
Made famous by Australia in 1964.
Read Step 3 →So which is better?
Three honest answers.
Read Step 4 →Quick answers
Does a screw cap mean a wine is cheap?
No. Australia and New Zealand use screw caps for nearly all their wines, including premium and icon-level bottles. The closure is the winemaker's choice — not a quality signal. A great Malbec under screw cap will beat a mediocre Malbec under cork every time.
Why do some wines still use cork?
Because natural cork allows a very slow, controlled amount of oxygen into the bottle — about 1 milligram per year. That tiny ingress is what lets serious reds evolve over 10–30 years. For ageworthy wines, no proven substitute has matched cork yet.
What is cork taint?
A faulty bottle caused by TCA, a compound formed when chlorine reacts with natural fungi in cork bark. Wine smells of wet cardboard or damp basement. About 3–5% of cork-sealed bottles are affected. If you suspect cork taint, ask for a replacement.
Can a wine under screw cap age?
Yes, but the debate is alive. Wines under screw cap age more slowly. Some producers believe screw-cap wines age beautifully, just differently. Others say true 20-year evolution still requires cork. Modern Saranex-lined screw caps support 5–10 years of aging well.
What about synthetic corks and DIAM?
Synthetic corks are mostly for inexpensive early-drinking wines. DIAM is a technical cork made from cork particles cleansed of TCA — premium quality with calibrated oxygen exchange, increasingly used for serious wines that want cork's behavior without taint risk.