Electronic Glass Cloth Up 228%: What It Means for PLC and Drive Costs

The price of 7628 electronic glass cloth — the grades used in the copper-clad laminates behind most industrial control boards — has risen from about CNY 4.2 per metre at the end of 2025 to CNY 13.8 per metre in October 2026, a cumulative increase of roughly 228%, including 64% in the third quarter alone. The driver is not a shortage of looms in general but a reallocation of capacity toward the ultra-thin, low-Dk cloth demanded by AI servers and high-speed networking, combined with long lead times for high-end weaving equipment. Because glass cloth feeds copper-clad laminate (CCL), CCL feeds PCBs, and PCBs carry PLCs, variable-frequency drives and servo drives, the cost pressure is now visible in industrial automation price letters — Omron raised prices on PLCs, sensors and relays by 5–50% in February 2026, and Siemens, ABB and Delta have all issued adjustments.

Quick answer: what is happening to electronic glass cloth prices?

Electronic glass cloth is the woven glass fabric used as the reinforcing substrate in copper-clad laminate. The 7628 style is the workhorse thick cloth used in conventional FR-4 boards — the material inside most PLC racks, drive power stages and I/O modules.

• Price: 7628 cloth moved from about CNY 4.2/m (end-2025) to CNY 13.8/m (October 2026), roughly +228%. Some trackers using an October 2025 baseline report gains of 195–258%, depending on the exact quote date and supplier.
• Q3 alone: CNY 7.5/m at the end of June to CNY 12.3/m at the end of September — a 64% quarterly increase.
• Upstream: G75 electronic yarn rose from about CNY 9,000/t in Q3 2025 to CNY 14,525/t by June 2026 (+61%), with a further CNY 3,000/t increase in October.
• Downstream: FR-4 laminate reportedly moved from around CNY 70 per sheet in July 2025 to CNY 260 per sheet by June 2026; CCL makers have issued repeated price letters through 2026, and PCB fabricators are quoting 10–15% increases.
• Root cause: AI server and high-speed networking demand is absorbing ultra-thin and low-dielectric cloth capacity; weavers are switching looms to high-value thin cloth, leaving conventional thick cloth structurally short.
• Duration: new yarn and cloth capacity has an 18-month build cycle, with most additions expected by the end of 2027. Buyers should plan for elevated prices through 2027 rather than a quick reversal.

The price data: a year of step changes

The 7628 price did not drift upward; it moved in steps, each triggered by a CCL restocking wave or a new cloth price letter. The table below consolidates the figures reported by Longzhong (隆众资讯) and Chinese financial media through October 2026.

Two notes on interpreting the 228% figure. First, baseline choice matters: trackers starting from October 2025 quotes (around CNY 4.3–4.5/m) produce cumulative gains nearer 195–210%, while those starting from the December low produce figures above 250%. The direction and magnitude are consistent; the exact percentage is not a single official number. Second, the 7628 grade is a proxy. Ultra-thin styles such as 1080 and 2116 have risen further, and low-Dk grades used in AI server boards are on separate, even tighter supply chains.

Why AI demand creates a shortage of ordinary glass cloth

The counter-intuitive part of this cycle is that AI servers do not use much 7628 cloth. They use high-layer-count boards built on ultra-thin, low-dielectric and sometimes quartz-based fabrics. So why has the price of ordinary thick cloth tripled?

The answer is capacity reallocation, and it works through three mechanisms.

1. Looms move to thin cloth. A glass cloth loom can be configured for different styles, but thin cloth runs slower and demands tighter process control. When margins on AI-grade cloth are several times higher, weavers shift capacity — and the ordinary thick cloth that used to fill the remaining hours disappears from the market first.

2. Loom lead times are long. High-end weaving equipment is not off-the-shelf. New looms take quarters to deliver and commission, which caps how fast total capacity can respond even when prices justify investment.

3. Inventory buffers were empty. After a weak 2024–2025 electronics cycle, CCL makers and PCB fabricators were running lean. When AI demand accelerated, restocking collided with reduced thick-cloth output. Industry sources describe the market as being in a “tight balance”, with high-end material effectively sold out and thin cloth tighter than thick.

New supply is coming. Bulky glass-fibre yarn furnaces and cloth lines are being commissioned — including a 70,000 t/y electronic-grade yarn project in Shaoguan and a 100,000 t/y line in Huai’an — but construction cycles run about 18 months, with most additional capacity expected by late 2027. That is why the current tightness is described as structural rather than a one-quarter spike.

From glass cloth to a PLC: how the cost travels

Industrial automation buyers do not purchase glass cloth, so the relevant question is how much of each price increase survives the journey to a PLC, drive or servo amplifier. The chain has five links, and each one absorbs or passes cost depending on concentration and contract terms.

Two structural details explain why the pass-through has been unusually smooth. CCL production is concentrated among a few large suppliers, which gives them pricing power over a fragmented PCB industry. And for many end products, PCB content is a modest share of total bill of materials — so a doubling of laminate cost is painful but not existential, which makes buyers more willing to accept increases than to redesign.

For industrial control equipment, however, PCB content is not marginal. A variable-frequency drive is largely a power board plus a control board plus magnetics and a heatsink. A servo drive is similar. A PLC rack is a set of I/O and CPU modules, each with its own multi-layer board, connector and housing. When laminate and fabrication costs rise together, the electronics share of the product cost rises with them.

Which automation products are most exposed

Exposure is not uniform. It depends on board area, layer count, copper weight and the share of electronics in total product cost.

The last row deserves emphasis for anyone maintaining rotating-machinery protection systems. A 3500-series module is not a high-volume consumer board. It is a low-volume, high-mix assembly with stringent qualification, traceability and environmental requirements. In a rising laminate market, the constraint for such products is less the raw material percentage than the willingness of fabricators to accept small, exacting orders when large AI-related orders are queuing. That shows up as longer lead times and less flexible scheduling — both of which matter more to a plant than a few percent on the module price.

Evidence the pressure has already reached automation

Glass cloth is an upstream story, but the automation price letters are not speculative. Published notices in 2026 include:

• Omron (February 2026): industrial automation products including PLCs, sensors and relays increased by 5–50%, with the company citing persistently high core material costs and stating it had already absorbed much of the pressure through supply-chain measures.
• Siemens (January 2026): list prices adjusted by an average of 2% for automation and motion-control products and 2.5% for electromechanical and low-voltage products, following earlier SIRIUS increases of 2–5% in December 2025.
• ABB (August 2026): smart power and smart building product lines adjusted by 3–5%, varying by series.
• Delta Electronics: standard power supplies repriced, citing copper, aluminium, rare metals and electronic component costs alongside logistics and lead-time pressure.
• PCB fabricators: multiple suppliers issued 10–15% increases during 2026, some for the third time in a year.

Not every increase is attributable to glass cloth alone. Copper, aluminium, gold plating salts, capacitors and freight all moved in the same period. But the timing and the stated reasons line up: material cost pressure at the board level, passed upward through the product hierarchy.

What procurement and maintenance teams should do now

For plants, OEMs and system integrators, the practical response is not to predict the exact peak but to reduce exposure to it.

1. Revalidate quotations faster. Extend price validity only with a material-index clause. A six-month fixed quote on a drive cabinet is now a margin risk, not a customer-friendly gesture.
2. Pre-buy critical spares. Where a module is single-source and sits on a critical train, advance purchase removes both price and lead-time risk. This is especially relevant for protection and condition-monitoring modules.
3. Audit single-source boards and modules. Identify products where one PCB supplier or one module variant supports multiple systems. Those are the points where a laminate allocation decision becomes a plant outage.
4. Separate price risk from lead-time risk. A 10% increase is a budget problem; a 12-week lead time on a critical I/O module is an availability problem. They need different mitigations — hedging and inventory versus qualifications and alternates.
5. Use the aftermarket deliberately. For legacy systems, tested surplus and refurbished modules can bridge a price spike, provided provenance and warranty are documented. See our guidance on 3500 lifecycle and Orbit 60 migration for where that approach is appropriate and where it is not.
6. Revisit project budgets now, not at order time. Automation content in a project is typically quoted 6–18 months before delivery. If laminate prices hold through 2027, projects priced in early 2026 carry unrecovered cost.

What to watch next

Five indicators will show whether the cycle is easing or extending:

• The monthly 7628 quote. A sustained pause in the monthly increase is the first sign of balance; a single flat month is not.
• G75 yarn price. Yarn leads cloth. If yarn stops rising while cloth still climbs, weavers are capturing margin rather than passing cost — a later-stage signal.
• CCL price-letter frequency. The number of letters per quarter is a proxy for how much cost is still being pushed through.
• Loom deliveries and thin-cloth capacity. Capacity shifting back toward thick cloth would relieve 7628 faster than new furnaces.
• AI capex guidance. Hyperscaler spending plans determine whether low-Dk cloth keeps absorbing capacity. A pause in AI infrastructure orders would change the picture quickly.

Against those, keep one counter-signal in view: capacity is being built. Projects with 18-month cycles will land through 2027, and laminate prices have historically mean-reverted once supply catches up. The risk of over-committing to forward inventory is real if the turn arrives sooner than expected.

Bottom line

A 228% rise in the price of ordinary electronic glass cloth is not a niche materials story. It is the upstream end of a cost chain that terminates in every PLC rack, drive cabinet and servo axis a plant buys. The mechanism is specific and understandable: AI demand pulled capacity toward ultra-thin, low-Dk cloth, loom lead times capped the supply response, and lean inventories left no buffer for conventional grades.

The evidence that this has reached automation is already public — Omron’s 5–50% adjustment, Siemens’ and ABB’s list price changes, and repeated PCB increases. For buyers, the correct conclusion is not that prices will keep rising forever, but that price and lead-time risk are now material enough to manage explicitly: shorter quote validity with index clauses, targeted pre-buying of critical spares, dual-sourcing where qualification allows, and project budgets that assume elevated electronics costs through 2027.

Frequently asked questions

Why did electronic glass cloth prices rise 228%?

AI servers and high-speed networking increased demand for ultra-thin and low-dielectric glass cloth. Manufacturers shifted looms and capacity toward those higher-value products, leaving conventional thick cloth such as 7628 structurally short. Long lead times for weaving equipment and lean downstream inventories amplified the increase.

What is 7628 electronic glass cloth used for?

7628 is a standard thick glass cloth used as reinforcement in conventional FR-4 copper-clad laminate. That laminate is the base material for most industrial control PCBs, including PLC modules, drive power boards and I/O cards.

How much have copper-clad laminates and PCBs increased?

Reported FR-4 laminate prices moved from roughly CNY 70 per sheet in July 2025 to about CNY 260 per sheet by June 2026, and CCL makers issued repeated price letters through 2026. PCB fabricators have quoted increases of 10–15% on new orders. Exact figures vary by thickness, copper weight and supplier.

Are PLC and drive prices already rising because of this?

Yes. Omron raised prices on PLCs, sensors and relays by 5–50% in February 2026, citing high raw-material costs. Siemens adjusted automation and motion-control list prices by about 2% in January 2026, and ABB adjusted selected lines by 3–5% in August 2026. Not all of these increases are attributable to glass cloth alone, but the timing and stated causes align.

Will the shortage end in 2027?

New electronic yarn and cloth capacity has an approximately 18-month construction cycle, with most additions expected by the end of 2027. That supports an easing through 2027, but timing depends on AI demand and on how quickly capacity can shift back to conventional thick cloth.

What should plants do about spare-part pricing and lead times?

Pre-buy critical single-source modules, shorten quotation validity with material-index clauses, audit single-source boards, and treat lead-time risk separately from price risk. For legacy condition-monitoring systems, tested surplus modules can bridge a spike if provenance and warranty are documented.

Sources and further reading

• 新浪财经 – AI算力拉动需求增长 电子布迎来高景气周期 (Longzhong 7628 price series, Q3 +64%)
• 中国证券报 – 供需”紧平衡”引发电子布10月再涨价 覆铜板成本向PCB顺畅传导
• 新浪科技 – 一”布”难求！PCB上游迎来疯狂涨价时刻
• 捷配 – 覆铜板市场两极分化：AI高端基材”限购无In Stock”，常规FR4Stock告急Price翻倍
• 同花顺 – 电子布Industry研报（26Q3 7628 均价及涨幅）
• 中国电子元件Industry协会 – 欧姆龙发涨价函 涨幅5–50%
• Siemens – Pricing Letter 2026 (list price changes effective 1 January 2026)
• ABB – Price adjustment notice, August 2026 (3–5%)

Article last reviewed October 2026. Price figures are drawn from Chinese industry trackers, financial media and company notices; they vary by grade, supplier and quote date. Confirm current pricing and lead times with suppliers before committing to procurement plans.

Managing spares exposure on critical machinery? Browse the Bently Nevada 3500 system guide, the 3500 Series catalog and the 3500/92 communication gateway. For context on platform continuity, see our reviews of System 1 at 20 years and the Machine Health AI service. More industry insights and product news are published regularly; for part numbers, availability and lead times, contact the TenBN team.