VT-47 is a high-Tg, lead-free-compatible FR-4 laminate and prepreg from Ventec, with a phenolic-cured resin system, CAF resistance, UV blocking and low Z-axis expansion. On Ventec’s datasheet it has a Tg of 180°C (DSC), a Td of 355°C, T288 over 30 minutes, 2.3% Z-axis expansion from 50 to 260°C, and a Dk of 4.27 with a Df of 0.016 at 1 GHz. It is listed to IPC-4101 slash sheets /97, /98, /99, /101 and /126, and is used for multilayer boards that go through several lead-free reflow cycles. This page gathers Ventec’s published values, shows Dk by construction, compares VT-47 with similar high-Tg grades, and explains how to specify it. For other laminates, see our PCB materials guide.
1. What Is VT-47?
| Item | VT-47 |
|---|---|
| Maker | Ventec International Group |
| Type | High-Tg FR-4, phenolic cured, lead-free compatible |
| Features listed | CAF resistant, UV blocking, AOI compatible, low Z-axis CTE |
| IPC-4101 slash sheets | /97, /98, /99, /101, /126 |
| UL file | E214381 |
| Core thickness | 0.05–5 mm (0.002–0.200 in) |
| Copper | 1/4 oz to 12 oz |
Sources: Ventec VT-47 datasheet (revision B4, March 2020) and VT-47 processing guide (August 2025). Variants such as VT-47 LT have their own datasheets; do not mix their values with VT-47.
2. What Does the Datasheet Say?
| Property | Typical | Specification | Method |
|---|---|---|---|
| Tg (DSC) | 180°C | ≥ 170°C | IPC-TM-650 2.4.25 |
| Tg (TMA) | 180°C | — | 2.4.24 |
| Td | 355°C | ≥ 340°C | ASTM D3850 |
| T260 / T288 | > 60 min / > 30 min | ≥ 30 / ≥ 15 min | 2.4.24.1 |
| Thermal stress, 288°C solder float | > 600 s | Pass 10 s | 2.4.13.1 |
| Z-axis CTE below / above Tg | 45 / 190 ppm/°C | ≤ 60 / ≤ 300 | 2.4.24 |
| Z-axis expansion, 50–260°C | 2.3% | ≤ 3.0% | 2.4.24 |
| X/Y CTE | 11–13 ppm/°C | — | 2.4.24 |
| Dk / Df at 1 GHz (50% resin) | 4.27 / 0.016 | ≤ 5.2 / ≤ 0.035 | 2.5.5.9 |
| Peel strength, 1 oz | 1.3–1.75 N/mm | ≥ 1.05 N/mm after stress | 2.4.8 |
| Water absorption | 0.12% | ≤ 0.50% | 2.6.2.1 |
| CTI | Grade 3 (175–250 V) | — | ASTM D3638 |
| Thermal conductivity | 0.5 W/(m·K) | — | ISO 22007-2 |
| Flammability | V-0 | V-0 | UL 94 |
Typical values are not guaranteed; the specification column is what Ventec commits to. Use the specification values in purchase documents and the typical values for engineering estimates.
3. How Does Dk Change With Construction?
Ventec’s processing guide lists Dk and Df per core and prepreg construction at 1, 2, 5 and 10 GHz. At 10 GHz, for example:
| Construction | Resin content | Dk at 10 GHz | Df at 10 GHz |
|---|---|---|---|
| 106 prepreg | 76% | 3.35 | 0.021 |
| 1080 prepreg | 66% | 3.60 | 0.020 |
| 2116 prepreg | 54% | 3.93 | 0.018 |
| 7628 prepreg | 48% | 4.10 | 0.017 |
| 0.2 mm core, 1 × 7628 | 46% | 4.13 | 0.016 |
Dk runs from about 3.35 to 4.35 across the published constructions, so calculate impedance from the cores and prepregs in your stackup, not from the single 1 GHz headline value.
4. How Does VT-47 Compare With Similar High-Tg Grades?
| Property | Ventec VT-47 | Shengyi S1000-2M | Kingboard KB-6160 (normal Tg, for contrast) |
|---|---|---|---|
| Tg (DSC) | 180°C | 180°C | 138°C |
| Td | 355°C | 355°C | 310°C |
| T288 | > 30 min | 30 min | — |
| Z-axis expansion, 50–260°C | 2.3% | 2.4% | 4.3% |
| Dk / Df at 1 GHz | 4.27 / 0.016 | 4.6 / 0.018 | 4.4 / 0.018 |
| IPC-4101 slash sheet | /97 /98 /99 /101 /126 | /126 | /21 |
Values are typical, from each maker’s datasheet; test conditions differ. VT-47 and S1000-2M sit in the same high-Tg class with similar thermal values; KB-6160 shows how far a normal-Tg grade is behind on expansion and Td. Other grades in this class include IT-170 and TU-768; our S1170G vs S1000-2M comparison covers two more.
5. When Is VT-47 a Good Choice?
- Multilayer boards with several lead-free reflow cycles or rework.
- Thicker boards and fine-pitch through-holes, where low Z-axis expansion protects plated holes.
- Designs with tight hole-to-hole spacing, where CAF resistance matters.
- General digital, industrial, automotive and power boards that do not need low-loss material.
Choose a different family when the requirement calls for it: a halogen-free grade for a halogen restriction (see our halogen-free PCB guide), a low-loss laminate when channel analysis shows loss is too high, or polyimide for higher operating temperatures.
6. What Processing Notes Does Ventec Give?
Ventec’s processing guide covers storage, lamination, drilling and baking. Points that affect buyers:
- Prepreg shelf life: 3 months below 23°C and 55% RH, or 6 months below 5°C; laminate 24 months sealed at room temperature.
- Lamination: cure above 185°C for more than 60 minutes, with vacuum held until the material is above 140°C.
- Baking boards: 125°C for 4–8 hours before packing; if packed boards are stored more than 3 months, 125°C for 4–6 hours before use.
These are Ventec’s recommendations for this material, adapted by each fabricator to its equipment. Our delamination guide explains why the baking step matters.
7. How Do You Specify VT-47?
| Item | What to write |
|---|---|
| Material | “Ventec VT-47 laminate and prepreg” |
| Specification | IPC-4101 slash sheet, for example /126 |
| Substitution | “Equivalent per IPC-4101/126 with Z-axis expansion ≤ 3.0% and T288 ≥ 15 min,” or “no substitution without approval” |
| Stackup | Core and prepreg constructions, or “fabricator to propose for approval” |
| Impedance | Targets; calculate with construction-specific Dk |
Naming the slash sheet and the properties that matter lets the fabricator propose an equivalent if VT-47 is not available, without accepting a weaker grade.
How Can We Help?
Send your stackup with the material you specified and your Gerber files; we will confirm VT-47 availability and constructions, or propose an equivalent for your approval, in the quote, which comes back within 2 hours for bare boards. We build multilayer PCBs up to 40 layers, and you can compare laminates with our PCB material selector or have the choice reviewed in a free DFM check.
Conclusion
VT-47 is Ventec’s high-Tg, phenolic-cured, CAF-resistant FR-4: Tg 180°C, Td 355°C, T288 over 30 minutes, 2.3% Z-axis expansion, and Dk 4.27 / Df 0.016 at 1 GHz, on IPC-4101 /97, /98, /99, /101 and /126. It suits multilayer boards with repeated lead-free soldering. Use construction-specific Dk for impedance, and specify the slash sheet and key properties so substitutes stay equivalent. Contact us for a quote.
FAQ
What is VT-47? A high-Tg, lead-free-compatible FR-4 laminate and prepreg system from Ventec.
What is the Tg of VT-47? 180°C typical by DSC, with a 170°C minimum specification.
What is the Dk of VT-47? 4.27 at 1 GHz on the datasheet; about 3.35 to 4.35 across constructions in Ventec’s processing guide.
Is VT-47 CAF resistant? Ventec lists it as CAF resistant.
What is the difference between VT-47 and S1000-2M? Both are high-Tg FR-4 grades with similar Tg, Td and Z-axis expansion; compare the construction-specific Dk and availability for your stackup.
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