• VT-441C Laminate/Prepreg

    Version: 31/08/2024 /127/128

    General Information

    • Phenolic Cured System
    • Halogen free & Mid-Tg
    • FR15.1 & MOT 150˚C
    • CTI 600V
    • UV Blocking
    • CAF Resistance
    • Low Z-CTE
    • Excellent Thermal Reliability

    Application

    Automotive, Instrumentation, Communication Equipment, Electronic Game Machines, White Goods, etc.

    Availability

    • Core Thickness: 0.004” (0.10mm) to 0.200” (5mm), available in sheet or panel form
    • Copper Foil: 1/2oz to 12oz
    • Prepregs are available in roll or panel form
    • E-Glass styles: 7628, 2116, 1080
    Properties Prepreg Laminate
    Storage Condition Temperature Below 23°C (73°F) Below 5°C (41°F) Room
    Relative humidity Below 55% RH / /
    Shelf Life 3 months 6 months 24 months (airproof)

    The prepreg exceeding shelf life should be retested.

    Properties Sheet IPC-4101E /127 /128

    Properties Test Method Units Specification Typical Value
    Thermal Properties
    Tg IPC-TM-650 2.4.25 °C 150 minimum 155
    Td ASTM D3850 °C 325 minimum 385
    T260 IPC-TM-650 2.4.24.1 Minute 30 minimum >60
    T288 IPC-TM-650 2.4.24.1 Minute 5 minimum >10
    Thermal Stress @ 288°C IPC-TM-650 2.4.13.1 Second Pass 10s >200
    Z-axis CTE Before Tg IPC-TM-650 2.4.24 ppm/°C 60 maximum 35
    After Tg IPC-TM-650 2.4.24 ppm/°C 300 maximum 190
    Total Expansion (50~260°C) IPC-TM-650 2.4.24 % 3.5 maximum 2.2
    MOT UL 746E °C - 150
    Electrical Properties
    Dk @ 1GHz IPC-TM-650 2.5.5.9 - 5.4 maximum 4.6
    Df @ 1GHz IPC-TM-650 2.5.5.9 - 0.035 maximum 0.011
    Volume Resistivity After Moisture Resistance IPC-TM-650 2.5.17.1 MΩ-cm 1.0E+4 minimum 5.0E+8
    E-24/125 IPC-TM-650 2.5.17.1 MΩ-cm 1.0E+3 minimum 5.0E+6
    Surface Resistivity After Moisture Resistance IPC-TM-650 2.5.17.1 MΩ 1.0E+4 minimum 5.0E+7
    E-24/125 IPC-TM-650 2.5.17.1 MΩ 1.0E+3 minimum 5.0E+6
    Electrical Strength IPC-TM-650 2.5.6.2 Volt/mil (KV/mm) 762 (30) minimum 1200~1400 (54)
    Dielectric Breakdown IPC-TM-650 2.5.6 KV 40 minimum 60
    Comparative Tracking Index (CTI) ASTM D3638 Rating (Volt) - Grade 0 (>600)
    Arc Resistance ASTM D495 Second - 187
    Mechanical Properties
    Peel Strength (1oz) As received IPC-TM-650 2.4.8 lb/in (N/mm) - 8 (1.4)
    After thermal stress IPC-TM-650 2.4.8 lb/in (N/mm) 6 (1.05) minimum 8 (1.4)
    Flexural Strength Warp IPC-TM-650 2.4.4 KPsi (MPa) 60 (415) minimum 72 (500)
    Fill IPC-TM-650 2.4.4 KPsi (MPa) 50 (345) minimum 58 (400)
    Physical Properties
    Moisture Absorption IPC-TM-650 2.6.2.1 % 0.80 maximum 0.18
    Flammability UL-94 Rating V-0 minimum V-0

    All test data provided are typical values and not intended to be specification values. Disclaimer: The information and data contained in this technical literature is based on data and knowledge correct at the time of publishing/printing and is believed to be accurate and is offered in good faith for the benefit of the user. The user should make his own tests to verify the suitability of this product for any application before its use. All data are typical values only and subject to change without notice.

    Published on: 31/08/2024

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  • VT-441C Laminate/Prepreg

    UL Approval: E214381 Version: 05/08/2025 /127/128

    Storage Condition & Shelf Life

    Prepreg Laminate
    Storage Condition Temperature < 23℃ (73℉) < 5℃ (41℉) Room
    Relative Humidity < 55% RH / /
    Shelf Life 3 Months 6 Months 24 Months

    • The prepreg exceeding shelf time should be retested.
    • Take care in handling thin core laminates as they are easily damaged.
    • If the prepreg is not consumed within 48hrs after opening the vacuum package, it is recommended that the bags be resealed.
    • Material is available in both long and short grain. The grain direction is indicated on the label with an arrow.

    Precautions In Handling

    • Please be careful when single ply of 1080 prepreg is designed to the dielectric layer.
    • VT-441C has weaker thermal resistance than regular VT-441. Please be very careful when 8L and higher layer count is designed or dielectric with single ply of 1080.
    • VT-441C Dk is a little higher than VT-441. Please take it into consideration whenever impendence control is required.
    • CTI 600 only can be guaranteed when the full stack-up is from VT-441C material.
    • Please be noticed that the surface roughness and clearness affect CTI rating.

    Prepreg Availability

    PP Type Resin Content Press Thickness (mil) DK DF
    @ 1GHz @ 2GHz @ 5GHz @ 10GHz @ 1GHz @ 2GHz @ 5GHz @ 10GHz
    7628 50% 8.0 4.6 4.6 4.5 4.5 0.011 0.011 0.012 0.012
    7628 46% 7.5 4.6 4.6 4.5 4.5 0.011 0.011 0.012 0.012
    1506 54% 7.0 4.5 4.5 4.4 4.4 0.012 0.012 0.013 0.013
    2116 58% 5.0 4.5 4.5 4.4 4.4 0.012 0.012 0.013 0.013
    1080 68% 3.1 4.3 4.3 4.2 4.2 0.012 0.012 0.013 0.013
    106 76% 2.3 4.1 4.1 4.0 4.0 0.013 0.013 0.014 0.014

    Remark: More types could be available upon request. When 2116PP or/and 1080PP is used as the outmost layer, 2-ply minimum is required to ensure CTI 600. 2-Ply 106 prepreg can only withstand CTI 400V.

    Laminate Availablity

    Core Thickness Stack-up Resin Content DK DF
    inches @ 1GHz @ 2GHz @ 5GHz @ 10GHz @ 1GHz @ 2GHz @ 5GHz @ 10GHz
    0.008 1-7628 46% 4.6 4.6 4.5 4.5 0.011 0.011 0.012 0.012
    0.012 2-1506 46% 4.6 4.6 4.5 4.5 0.011 0.011 0.012 0.012
    0.015 2-7628 46% 4.6 4.6 4.5 4.5 0.011 0.011 0.012 0.012
    0.016 2-7628 46% 4.6 4.6 4.5 4.5 0.011 0.011 0.012 0.012
    0.018 2-7628 + 1-1080 48% 4.6 4.6 4.5 4.5 0.011 0.011 0.012 0.012
    0.020 2-7628 + 1-2116 47% 4.6 4.6 4.5 4.5 0.011 0.011 0.012 0.012
    0.024 3-7625 46% 4.6 4.6 4.5 4.5 0.011 0.011 0.012 0.012
    0.028 4-7628 42% 4.7 4.7 4.6 4.6 0.011 0.011 0.012 0.012
    0.030 4-7628 46% 4.6 4.6 4.5 4.5 0.011 0.011 0.012 0.012
    0.036 5-7628 46% 4.6 4.6 4.5 4.5 0.011 0.011 0.012 0.012
    0.042 6-7628 46% 4.6 4.6 4.5 4.5 0.011 0.011 0.012 0.012
    0.054 7-7628 46% 4.6 4.6 4.5 4.5 0.011 0.011 0.012 0.012
    0.057 8-7628 46% 4.6 4.6 4.5 4.5 0.011 0.011 0.012 0.012
    0.058 8-7628 46% 4.6 4.6 4.5 4.5 0.011 0.011 0.012 0.012
    0.060 8-7628 46% 4.6 4.6 4.5 4.5 0.011 0.011 0.012 0.012

    Dk values are for impedance design More types could be available upon request. In order to satisfy CTI ≥600V, please don’t design 0.10mm in outer layer.

    Press Condition

    1. Heating rate (Rate of Rise) of material [Material Temperature]: Programmable Press: ≥2.0ºC/min 2. Curing Temperature & Time: >60min at more than 180ºC (356ºF) Material temperature 3. Full Pressure: ≥300psi and temperature to apply full pressure before ≤80ºC 4. Vacuuming should be continued until over 140ºC (284ºF) [Material Temperature] 5. Cold Press condition: Keep Plate @ Room Temperature by water; Pressure:100psi; Keep Time: 60minutes VT-441C Hot Start Cycle.jpg

    Typical Drilling Conditions

    Diameter Stack Height Spindle (KRPM) Infeed (mm/s) Retract (mm/s) Hit Count
    0.25mm 1 PNL/Stack 130 38 300 800
    0.30mm 1 PNL/Stack 130 38 300 800
    0.60mm 1 PNL/Stack 80 43 300 800

    1. Excessive wear of carbide drill bits. Diamond coated drill bits preferred; 2. LE Aluminum sheet and white phenolic entry board are preferred;

    Desmearing Process

    The de-smearing rate of VT-441C is less than regular VT-441. 1 time vertical de-smearing is preferred. Please examine hole wall to check de-smearing effect. Typical de-smearing rate for reference only:

    1x De-smearing Supplier Chemical
    0.27mg/cm2 Atotech Alkaline Permanganate

    Packaging and baking recommendation

    1. It is recommended to bake the board before packaging at 125ºC/4~8h to avoid moisture causing a decrease in heat resistance. 2. If the PCBs needs to be stored for a long time before use, it is recommended to use aluminum foil vacuum packaging. 3. If exceed 3 months after packaging , It is best to bake the PCBs at 125ºC/4~6h before assembly before use.
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