VT-447C Laminate/Prepreg

UL Approval: E214381 Version: 24/12/2024 /127/128/130

Shelf life

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

Prepreg exceeding shelf life should be retested.

Precautions In Handling

  • 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.

 

Prepreg Availability

G/F Type Resin Content Press Thickness (mil) Dk Df
@ 1GHz @ 2GHz @ 5GHz @ 10GHz @ 1GHz @ 2GHz @ 5GHz @ 10GHz
7628 50% 8.00 4.60 4.60 4.50 4.50 0.011 0.011 0.012 0.012
7628 46% 7.50 4.60 4.60 4.50 4.50 0.011 0.011 0.012 0.012
2116 60% 5.40 4.50 4.50 4.40 4.40 0.012 0.012 0.013 0.013
2116 58% 5.00 4.50 4.50 4.40 4.40 0.012 0.012 0.013 0.013
1080 68% 3.10 4.30 4.30 4.20 4.20 0.012 0.012 0.013 0.013

In order to satisfy CTI≥600V, 1 ply 2116 and 7628 or 2ply1080 is suggested to be used for outer layer. Remark: More types available upon request

Laminate Availablity

Core Thickness Stack-up Resin Content DK DF
mm inches @ 1GHz @ 2GHz @ 5GHz @ 10GHz @ 1GHz @ 2GHz @ 5GHz @ 10GHz
0.100 0.004 1-2113 57% 4.50 4.50 4.40 4.40 0.012 0.012 0.013 0.013
0.125 0.005 1-2116 55% 4.50 4.50 4.40 4.40 0.012 0.012 0.013 0.013
0.20 0.008 2-2113 57% 4.50 4.50 4.40 4.40 0.012 0.012 0.013 0.013
0.20 0.008 1-7628 50% 4.60 4.60 4.50 4.50 0.011 0.011 0.012 0.012
0.25 0.010 2-2116 55% 4.50 4.50 4.40 4.40 0.012 0.012 0.013 0.013
0.30 0.012 2-1506 46% 4.60 4.60 4.50 4.50 0.011 0.011 0.012 0.012
0.30 0.012 3-2113 57% 4.50 4.50 4.40 4.40 0.012 0.012 0.013 0.013
0.38 0.015 2-7628 46% 4.60 4.60 4.50 4.50 0.011 0.011 0.012 0.012
0.76 0.030 4-7628 46% 4.60 4.60 4.50 4.50 0.011 0.011 0.012 0.012
1.50 0.060 8-7628 46% 4.60 4.60 4.50 4.50 0.011 0.011 0.012 0.012
2.80 0.110 15-7628 46% 4.60 4.60 4.50 4.50 0.011 0.011 0.012 0.012

Remark: 1) Copper foil: Hoz~6oz 2) More types available upon request 3) In order to satisfy CTI≥600V，please don’t design 0.10mm in outer layer

Baking Cycles During PCB Fabrication

There are a few baking cycles during PCB fabrication. Please take into consideration when appropriate.

Process Purpose Cycle
After Cutting (for thin core below 10 mil) To get a stable dimension; To eliminate moisture 2~4 hours @ 150ºC
Before Drill To get a stable dimension or full cure 1 hour @ 150ºC
Before HASL To eliminate moisture 2 hours @ 125ºC
After Routing To get a stable dimension 1 hour @ 150ºC
Before OSP To prevent solder mask shelling 1 hour @ 140ºC
Before shipment (stored for over 3 months) To eliminate moisture 2~4 hours @ 105ºC

- Dimension stability is the better than Standard FR4 material. - For unclad or single sided laminates to be used in multilayer, please brush unclad sides before use. - Please check with your oxide vendor to make sure that our material is suitable with your oxide process. We recommend to control the peel strength with brown oxide copper over 2 Lb/in. - After oxide, it is preferred to press them within 12 hours. Anyhow, not more than 24 hours.

Pressing

Item Hot Start Press
Rate of Rise ≥2.0ºC/min
Cure Time ≥185ºC 60~90min
Max Temperature 200~205ºC
Full Pressure ≥300 PSI
Temperature to Apply Full Pressure Vacuuming should be continued until over 140ºC [Material Temperature] ≤80ºC

Typical Press Cycle

Picture1 VT-447C.png

Typical Drilling Condition

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 80
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-447C is less than regular VT-447. 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

Downloads for VT-447C