Complete guide to Shengyi PCB materials — S1141, S1000-2, S7439, S7136H, mmWave77 and full product series with specs, equivalents, and selection tips.
Walk into any Chinese PCB fabrication facility and you’ll see the name on the laminate edges: SYTECH. Walk through the bill of materials of any JLCPCB, PCBWay, or ³Ô¹Ïtv production run and you’ll see it again. Shengyi PCB materials have become the default substrate for a huge share of global PCB manufacturing — second in the world by volume for copper-clad laminates and prepreg, first in mainland China, and now the supply base for everything from $5 hobbyist boards to 28-layer telecom backplanes and 77 GHz automotive radar modules.
This guide is the hub page for engineers who need to understand the full Shengyi product ecosystem — which material goes with which application, how the product families relate to each other, how to specify them on a fabrication drawing, and where Shengyi fits versus Isola, Panasonic, and Rogers. I’ve broken it down by product tier the way a fabrication engineer actually thinks about it: standard FR-4, high-Tg, halogen-free, high-speed digital, high-frequency RF/microwave, flex, and thermal management. If you just need to know which core to pair with which prepreg for a 10-layer board, skip to the pairing table. If you want the full landscape, read through.
For manufacturing capability using these materials, the Shengyi PCB production page covers typical stack-ups and compliance certifications.
Who Is Shengyi Technology (SYTECH)?
Guangdong Shengyi Sci. Tech. Co., Ltd. — usually abbreviated SYTECH in technical documentation — was founded in Dongguan, China in 1985. It operates under the ticker 600183 on the Shanghai Stock Exchange, and its primary business is copper-clad laminates (CCL), bonding sheets (prepreg), and specialty substrates for printed circuit boards.
The company maintains laminate and prepreg manufacturing at its Dongguan headquarters plus additional plants in Suzhou, Changshu, Shaanxi, and Jiangxi. In 2019, SYTECH established a dedicated RF laminate facility in Nantong to produce PTFE and hydrocarbon ceramic substrates — the production base behind products like mmWave77. Shengyi USA, the North American operation, opened in 2016.
By volume, Shengyi is the largest CCL and prepreg maker in China and is consistently ranked #2 globally behind Kingboard in rigid laminate sales. Its customer list — Siemens, Motorola, Samsung, Sony, Huawei, Apple subcontractors, Tier-1 automotive suppliers — reflects qualification into most major supply chains that have historically used Isola, Panasonic, or ITEQ materials.
For PCB engineers, this matters for three practical reasons:
- Availability is excellent in Asia. Specify Shengyi and most Chinese fabs have it in stock in every common glass style and thickness.
- Cost is typically 20–40% below equivalent Isola or Panasonic products.
- Qualification data is mature. UL certifications, IPC-4101 slash sheet compliance, AEC-Q qualification for automotive grades, and full IST/CAF test reports are all publicly available from SYTECH.
Shengyi PCB Materials Product Family Overview
Shengyi’s product range divides cleanly into six functional families. The table below is how I lay it out on a stack-up review when someone asks “what are my material options?”
| Family | Representative Products | Tg Range | Typical Use |
| Standard FR-4 | S1141 | 130–140°°ä | Low-layer consumer, LED, basic industrial |
| Mid-Tg / Lead-free FR-4 | S1000H, S1170 | 150–170°°ä | 6–10 layer lead-free assembly |
| High-Tg FR-4 | S1000-2, S1000-2M | 170–180°°ä | 12+ layers, HDI, automotive |
| Halogen-Free FR-4 | S1155, S1165, S1170H | 150–180°°ä | Green electronics, EU/Asia compliance |
| High-Speed Digital | S7439 / S7439G / S7439C, Synamic 6N | 170–200°°ä | Backplanes, servers, 25–112 Gbps |
| High-Frequency / RF | S7136H, SCGA-500, mmWave77 | Varies | RF front-ends, radar, satellite |
| Flex / Rigid-Flex | SF305, SF202 | — | Wearables, foldable electronics |
| Thermal / Metal Core | STA-series, Autolad | — | LED arrays, power electronics |
Within each family, Shengyi offers matched core-laminate plus prepreg pairs. The prepreg product code usually adds a “B” suffix (e.g., S1000-2 core pairs with S1000-2B prepreg) or ends in a dedicated number (e.g., S1141 core pairs with S0401 prepreg).
Standard and High-Tg FR-4: The Workhorse Shengyi PCB Materials
Roughly 80% of all PCBs built with Shengyi PCB materials use one of the four FR-4 grades in this family. Understanding the differences between them is the foundation of the catalog.
S1141 — Economy Mid-Tg FR-4
S1141 is the economy tier. It’s a di-functional epoxy glass laminate with a Tg of 140°C (DSC), UL 94V-0, UV-blocking/AOI compatible. The matching prepreg is S0401.
Key typical values: Tg 140°C, Td ~325°C, T288 ~2 min, Dk ~4.5 at 1 GHz, Df ~0.016. Z-axis CTE is relatively high, so it’s not a good choice for high-layer-count boards. Where it shines is 2- to 8-layer consumer boards, LED drivers, low-end industrial controllers, and any application where per-unit cost dominates the material decision.
Where not to use it: Lead-free reflow with multiple passes, boards over 12 layers, heavy copper over 2 oz, HDI with microvias, CAF-sensitive applications. The T288 number around 2 minutes is too thin for rework cycles.
S1000H — The Mid-Range Sweet Spot
S1000H (paired with S1000HB prepreg) is Shengyi’s mid-Tg lead-free-compatible FR-4. Tg of 150–155°C (DSC), T288 exceeding 20 minutes, Z-axis CTE around 2.8–3.0%, good CAF resistance. This is the material I recommend as the default for most 6–12 layer professional designs — roughly equivalent to Isola FR406 in performance with better availability in Asian supply chains.
The economics work too: cost bump over S1141 is modest, but you get dramatically better thermal margin for double-sided reflow and rework. Most commercial-grade designs that don’t need AEC-Q100 or very thick multilayers should default to S1000H.
S1000-2 — High-Tg for Demanding Multilayers
S1000-2 is Shengyi’s high-Tg workhorse. Tg 170°C (DSC), Td ≥340°C, T260 60 min / T288 >20 min / T300 >5 min, Z-axis CTE 2.4–2.8%, excellent CAF resistance, meets IPC-4101B/126. Matching prepreg is S1000-2B.
This is what fabricators actually press for 12+ layer boards, heavy inner copper designs, BGAs with fine pitch, high aspect ratio PTHs (>1:8), automotive ECUs without AEC-Q radar requirements, and anything where the assembly process will stress the laminate. Comparable to Isola 370HR and ITEQ IT180A in the equivalent-material tables.
S1000-2M — Filled-Resin Top Tier
S1000-2M (with matching S1000-2MB prepreg) is the filled variant of S1000-2. Tg 170°C (DSC) — some datasheets list 180°C — but the thermal numbers are stronger across the board: Td 355°C, T288 of 30 minutes, Z-axis CTE as low as 41 ppm/°C before Tg. This is the correct call for 16+ layer HDI, under-hood automotive, server backplanes, and any design requiring multiple reflow plus rework cycles without delamination risk.
The trade-off: the filler makes desmear tougher than plain FR-4, and some fabs charge a premium for it because drill bits wear faster. Worth it for high-reliability work.
FR-4 Quick Reference Table
| Property | S1141 | S1000H | S1000-2 | S1000-2M |
| Tg DSC (°C) | 140 | 150–155 | 170 | 170–180 |
| Td (°C) | ~325 | ~335 | ≥340 | 355 |
| T288 (min) | ~2 | >20 | >20 | 30 |
| Z-CTE before Tg (ppm/°C) | ~55 | ~50 | ~45 | ~41 |
| Dk @ 1 GHz | ~4.5 | ~4.4 | ~4.4 | ~4.5 |
| Df @ 1 GHz | ~0.016 | ~0.016 | ~0.016 | ~0.016 |
| CAF resistance | Standard | Good | Excellent | Excellent |
| IPC-4101 slash sheet | /21 | /98 | /126 | /126 |
| Max recommended layers | 12 | 14–16 | 20+ | 24+ |
| Lead-free compatible | Marginal | Yes | Yes | Yes |
Halogen-Free Shengyi PCB Materials
Halogen-free (HF) laminates use phosphorus-based or nitrogen-based flame retardants instead of brominated compounds. Europe, Japan, and increasingly U.S. markets require HF substrates for consumer electronics and many industrial products.
Shengyi’s halogen-free lineup covers every major Tg tier:
| Product | Tg (°C, DSC) | Class | Notes |
| S1155 | 150 | Mid-Tg HF | Consumer electronics, EU compliance |
| S1165 | 170 | High-Tg HF | Automotive, IATF 16949 certified |
| S1170 | 170 | High-Tg HF lead-free | Lead-free assembly, halogen-free |
| S1170G | 175 | High-Tg HF | Industrial, infrastructure |
For automotive applications, S1165 is qualified under IATF 16949 and used for ECUs, body controllers, and powertrain interfaces. The material passes AEC-Q100 temperature cycling requirements when paired with appropriate PCB design rules.
Halogen-free variants generally have slightly higher Dk than equivalent halogenated materials (because phosphorus-based resin systems have different dielectric response). For controlled-impedance work on HF laminates, get pressed-Dk tables from the fabricator — don’t use the datasheet nominal.
High-Speed Digital Shengyi Laminates: S7439 Series
The S7439 family is Shengyi’s answer to Panasonic Megtron 6 and Isola I-Speed — engineered specifically for high-speed digital (HSD) applications running PAM4 signaling at 25, 56, or 112 Gbps. The characteristic that separates HSD materials from standard high-Tg FR-4 is stable Dk and Df across a wide frequency band.
S7439 Family Specifications
| Product | Tg (DSC, °C) | Dk @ 10 GHz | Df @ 10 GHz | Target Application |
| S7439 | 200 | 3.80 | 0.0068 | 56 Gbps backplanes, high-reliability HSD |
| S7439G | 180 | 3.86 | 0.0070 | Halogen-free HSD, server boards |
| S7439C | 200 | 3.66 | 0.0060 | Low-loss HSD, aerospace-grade |
All three offer stable Dk/Df across 1 GHz to 20 GHz and operating temperatures from -40°C to +125°C, which is the temperature-stability window that matters for serdes signal integrity. They also provide CAF resistance down to 0.7mm pitch tested with industry-standard CAF test vehicles, compatible with heavy-copper applications (2 oz inner layers), and VLP (very low profile) copper foil with 3 µm Rz as the default option.
Synamic 6N
Synamic 6N is Shengyi’s low-loss HSD material processed on standard FR-4 production equipment — effectively a “low-loss FR-4” that lets you drop loss numbers without switching to a dedicated HSD fab. Good middle-ground for designs that need better-than-FR-4 performance without the cost of full S7439.
High-Frequency RF/Microwave Shengyi PCB Materials
The RF/microwave side of the Shengyi catalog is where the company has invested heavily in the last five years, with the dedicated Nantong facility opened in 2019. Three main product lines cover everything from L-band through millimeter wave.
S7136H — Hydrocarbon Ceramic
S7136H is a hydrocarbon woven-glass reinforced ceramic laminate. Typical Dk ~3.48, Df ~0.003 at 10 GHz, stable performance from 1 GHz to 20 GHz. The key feature: it can be fabricated on standard FR-4 equipment. That makes it far more accessible than PTFE-based RF materials, and the cost is substantially lower than Rogers RO4350B for comparable performance. Applications include sub-6 GHz 5G, base station antennas, Wi-Fi front-ends, and cost-sensitive RF designs.
SCGA-500 Series — PTFE Woven Glass
The SCGA-500 family is Shengyi’s PTFE woven glass offering for RF and microwave work. Two common grades:
| Grade | Dk @ 10 GHz | Typical Use |
| SCGA-500 GF220 | 2.20 | mmWave, ultra-low-loss antenna arrays |
| SCGA-500 GF255 | 2.55 | General RF/microwave |
These are PTFE, so they require specialized processing (plasma treatment for via metallization, controlled lamination profiles) and pair best with fabs that have RF experience.
mmWave77 — 77 GHz Automotive Radar
mmWave77 is ceramic-filled non-reinforced PTFE engineered specifically as a cost-effective alternative to Rogers RO3003 for automotive ADAS radar applications. Process Dk is 3.0 ±0.04, Df 0.0010 at 10 GHz measured by stripline method. Design Dk is 3.06 and insertion loss is −1.29 dB/in at 77 GHz on 5 mil dielectric.
The material is qualified for 77 GHz automotive radar, 60 GHz UAV sense-and-avoid, and other millimeter-wave applications. It passes solder float (288°C, 6X), thermal cycling (-65°C to +125°C, 500 cycles), and IST (23°C to 150°C, 1000 cycles) — the standard qualification suite for automotive radar substrates.
SF305 and SAR Series
These are additional PTFE-based products for 77 GHz radar and other millimeter-wave applications. SF305 is also used in flex circuits (the Adafruit flex PCB material kit uses SF305 polyimide). The full SAR series covers various RF power amplifier and antenna use cases.
Flex and Rigid-Flex Shengyi Materials
For flexible circuits, Shengyi’s SF series uses polyimide film base material. Common applications: smartphone touch modules, wearables, automotive displays, and rigid-flex assemblies combining polyimide flex layers with Shengyi FR-4 cores. The flex offerings aren’t as dominant in Shengyi’s portfolio as the FR-4 lines, so in practice fabs often combine Shengyi rigid sections with DuPont Pyralux or Panasonic Felios flex material. For rigid-flex work, verify what your fab actually uses — the bonding between rigid and flex layers is where material mismatch causes trouble.
Thermal Management and Metal Core Shengyi Materials
For LED lighting, automotive LED headlights, power electronics modules, and motor drives, Shengyi produces metal-core (aluminum or copper substrate) laminates and thermally enhanced FR-4 variants. These use dielectric films with elevated thermal conductivity (typically 1.0 to 3.0 W/m·K versus 0.3 W/m·K for standard FR-4) bonded to an aluminum or copper base plate. Typical applications: LED arrays, gate-driver power stages, BLDC motor controllers. The Autolad series targets automotive applications with specific thermal cycling and vibration requirements.
Matching Shengyi Core to Prepreg (Pairing Rules)
The single most common specification mistake I see is mixing core and prepreg from different suppliers. Shengyi materials are formulated as matched systems — the resin chemistry, cure kinetics, and Z-axis CTE are engineered to behave consistently as a pair. Mixing breaks that assumption and invites delamination under thermal cycling.
| Core (Laminate) | Matching Prepreg | Series |
| S1141 | S0401 | Standard FR-4 |
| S1000H | S1000HB | Mid-Tg |
| S1000-2 | S1000-2B | High-Tg |
| S1000-2M | S1000-2MB | High-Tg filled |
| S1165 | S1165B | Halogen-free automotive |
| S7439 | S7439B | High-speed digital |
| S7439G | S7439GB | HSD halogen-free |
| S7136H | Matching PP (thin-bonding) | RF hydrocarbon |
For mixed-material stack-ups — say RF layers on top with S7136H and digital layers below with S1000-2 — use the corresponding matched prepreg for each section and have the fabricator review the lamination cycle. Cross-family stack-ups need explicit engineering review, not just datasheet verification.
Shengyi PCB Materials vs Isola, Panasonic, Rogers
Most equivalence tables in industry documentation map Shengyi to other major suppliers roughly like this:
| Application | Shengyi | Isola Equivalent | Panasonic / ITEQ Equivalent | Rogers Equivalent |
| Standard FR-4 | S1141 | FR402 | R-1566 | — |
| Mid-Tg lead-free | S1000H | FR406 | R-1755C / IT-158 | — |
| High-Tg lead-free | S1000-2 / S1000-2M | 370HR | IT-180A / Megtron 2 | — |
| High-speed digital | S7439 | I-Speed / Tachyon | Megtron 6 / Megtron 7 | — |
| High-Tg halogen-free | S1165 / S1170H | 370HR-HF | R-1566WN | — |
| RF hydrocarbon | S7136H | — | — | RO4350B |
| 77 GHz ADAS radar | mmWave77 | — | — | RO3003 / RT/duroid 5880 |
The equivalence is approximate. For precise substitution, always compare datasheets parameter by parameter — especially Dk/Df at your operating frequency, Z-CTE, and CAF test conditions. Fabricators familiar with both families can usually advise which equivalent holds up in practice.
How to Specify Shengyi PCB Materials on Fabrication Drawings
Specification discipline separates designs that get built correctly from the ones where the fab substitutes whatever is in stock. The fabrication drawing note for Shengyi PCB materials should include:
- Material family and grade (e.g., “Shengyi S1000-2 or equivalent per IPC-4101/126”)
- Core thickness and copper weight per layer
- Prepreg glass style and resin content class per bonding layer (e.g., “1080 MR, 60% resin”)
- Finished board thickness and tolerance
- Controlled impedance targets (single-ended and differential) with tolerance
- Material certification requirementÌý— ask for lot traceability and UL-recognized laminate codes
- Preconditioning requirement if required (pre-bake at 120°C/4h before SMT)
- Reflow compatibilityÌý— specify lead-free peak and number of reflow cycles
Saying just “FR-4” is how you end up with a board that doesn’t match the stack-up you simulated.
Useful Resources and Database Downloads
- Shengyi Technology (global site)Ìý— shengyitech.com — full product catalog.
- Shengyi USA datasheet libraryÌý— shengyi-usa.com — downloadable PDFs for every major product including S1000-2, S1000-2M, S1000H, S7439, S7136H, mmWave77 process guides.
- IPC-4101 slash sheet specificationÌý— ipc.org — defines compliance classes /21, /24, /98, /99, /101, /126.
- Sierra Circuits Material SelectorÌý— protoexpress.com/tools/pcb-material-selector — searchable database including Shengyi grades.
- PCB Directory Shengyi manufacturer listÌý— pcbdirectory.com — verified Shengyi-capable fabs worldwide.
- UL iQ Online DatabaseÌý— iq.ulprospector.com — verify UL 94V-0 compliance and SYTECH laminate codes.
- Everything RF Shengyi product listingsÌý— everythingrf.com — datasheets for RF/microwave grades (S7136H, mmWave77).
- ³Ô¹Ïtv Shengyi capability pageÌý— /Shengyi-pcb/Ìý— manufacturing capabilities across the full Shengyi material lineup.
Frequently Asked Questions
Q1: Are Shengyi PCB materials as good as Isola or Panasonic? For the equivalent tier of product, yes, generally — and they’re qualified into the same OEMs (Samsung, Huawei, Siemens, Nokia, major automotive Tier-1s). Where the gap shows up is at the extreme high-loss-critical end: Panasonic Megtron 7 and Isola Tachyon still set the benchmark for 112 Gbps PAM4, and Rogers still leads in millimeter-wave PTFE. For 95% of designs, Shengyi is competitive on performance and typically 20–40% cheaper than equivalent Isola or Panasonic.
Q2: How do I verify I’m getting genuine Shengyi material and not a knock-off? Ask the fabricator for a material certificate with lot traceability. Genuine Shengyi laminates carry the SYTECH marking on the laminate edge and are listed in UL’s iQ database under specific laminate codes. For production lots, request a cross-section analysis of a test coupon to verify Tg and Z-CTE — this catches material substitution that simple visual checks miss.
Q3: Which Shengyi PCB material should I use for a 10-layer board with BGAs and lead-free reflow? S1000H or S1000-2. S1000H handles most 10-layer commercial designs at good cost. Step up to S1000-2 if you have fine-pitch BGAs (<0.5 mm), heavy inner copper (>2 oz), high aspect ratio vias (>1:8), or automotive reliability targets. Both are lead-free compatible with T288 >20 minutes, so rework cycles aren’t a concern.
Q4: Can I mix Shengyi with other brands in the same stack-up? Technically yes, but it’s not what I recommend. Different resin systems have different cure profiles and Z-CTEs, and under thermal cycling that shows up as delamination at the core-to-prepreg interface. Stay within the matched Shengyi system (S1000-2 with S1000-2B, S7439 with S7439B) for any design where reliability matters. The fab may substitute based on inventory — specify “no substitution without engineering approval” if this matters.
Q5: Where can I download official Shengyi datasheets? Shengyi USA (shengyi-usa.com) hosts downloadable PDFs for most Asia-Pacific product codes. For mainland China product codes not listed there, shengyitech.com is the primary source. Reputable manufacturers including PCBWay, JLCPCB, and ³Ô¹Ïtv can also provide datasheets and material certificates on request — particularly useful when you need the specific revision of a datasheet that was current at the time of your production lot.
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