Thailand's Copper Factories Are About to Hit a 69% Tariff Wall, and Time's Running Out

By Siam Sukkhee Trading Co., Ltd — 2026-07-04 — copper market Southeast Asia

I was talking to someone at DELTA Electronics last week. They run roughly 30% of their revenue through US orders, and nobody there is sleeping well these days.

Thailand is the last holdout in Southeast Asia. Malaysia, Indonesia, Cambodia—they've all signed. We haven't. And with a deadline of July 24 approaching, that's starting to look less like strategy and more like a problem.

The copper situation is what keeps people awake, actually. There's a Section 232 tariff of 50% on semi-finished copper products that's been sitting there since August 2025, applying to everything that moves. Stack it on top of whatever bilateral rate we eventually get—something like 10%, maybe 12.5% if we're unlucky—and you're looking at combined exposure above 69% for manufacturers producing wire harnesses, PCBs, battery components, all of that. Sanko Electronics over in Prachinburi makes wire harnesses for cars and appliances. They're directly in that zone. So is HANA Microelectronics pulling 26% of revenue from the US, and KCE Electronics at 21%.

These aren't marginal numbers.

The input cost increase for manufacturers runs somewhere between 10% and 15%, according to what the research puts out. Unless they can secure exemptions or find substitutes. The Board of Investment tried to help with a 50% corporate tax deduction for two years if you source locally—that's real, though it doesn't solve everything. Some producers are already looking at copper scrap from the Middle East instead of the US, which tells you how anxious people are. Thailand currently takes around 201,000 short tons of US copper scrap per year. Vietnam takes about 10,000. You don't unwind that kind of dependency in a few weeks, actually that's not quite right—you can unwind it, but it takes different suppliers and different logistics, and neither of those things are fast.

Why being last matters

Here's what actually pressures Bangkok. When your neighbors have deals done and you don't, sourcing managers making Q3 and Q4 allocation decisions are already moving work. Your uncertainty becomes their cost, which becomes their reason to move faster. Logistics people hate uncertainty more than they hate tariffs. Washington knows this. The closer we get to July 24, the more leverage they have, because Thai manufacturers will have goods sitting in ports waiting for a rate that nobody knows yet.

We offered zero tariffs on US beef and liquor. Whether that closes 25 open issues by the deadline is another question entirely.

The numbers that worry people most come from the Bank of Thailand's severe-case model—an 8.3% contraction in exports, a full percentage point off GDP growth. The University of the Thai Chamber of Commerce puts it differently: something like 275 billion baht reduction in export value under stress. That's roughly 1.48% of GDP. Those figures assume everything collapses, which probably won't happen. But you don't need collapse for real damage. You just need a delayed agreement. Get caught in the transition, take a 12.5% rate instead of 10%, and you've got a margin problem on every contract you priced weeks ago under different assumptions.

And everyone in manufacturing knows exactly how thin those margins already are.

Tags: DELTA Electronics, KCE Electronics, Thailand trade deal, Section 232 copper tariff stack, Thailand US tariff deadline July 2026, Thai electronics export impact 2026