S200S – RF BLOCKING FABRIC

RF Blocking effect – Fabric’s RF blocking effect = 30-40dB according to the manufacturers’ data sheet (10MHz-300MHz). But I find the report to be inadequate for presentation, so we tested the fabric myself. 
The fabric was tested by us and showed a good RF Blocking effect (see below).
Our tests showed that the RF blocking effect was at least ~99%/-20dB (using CORNET ED88T in front of a DECT Phone 1.8GHz. In most of the tests we have seen even better outcomes).

The fabric was then tested again and showed good results even after more than 6 laundry cycles in a washing machine in  40-60 degrees cycles, with soap.

Please see the outcomes of the test at the bottom of this page.

The Fabric is delicate and soft, and its ability to block RF is not reduced over laundry cycles.

• Composition:  50% cotton, 20% polyester, 30% Silver
• Weight:200 gr/m²
• Roll Width: 200cm (used to be 170 cm).
• Weaving pattern: Knitted fabric
• Colors:  One side is Light Gray-camouflage, the second side it Gray (the silver is embedded in this side).
• Please note that the RF Blocking ability of a piece of clothes is also largely dependable on the design of the application.
• Washable with limitation, please see Londry_info_and_instructions below
• Delicate fabric (not as durable as the  S190 or S240 but softer to wear)
• Very Flexible
• Stretchable
• Possible applications: Scarf, Sock hat, Hoodie, shirt, delicate cardigan, other.
• Made in CHINA
• Sent from ISRAEL
• Tax & VAT may be subjected on arrival of the fabric according to your country laws.
• Once cut, there is no money-back guarantee on this product
• All our RF blocking fabrics are cut off a large roll of fabric according to customer specifications. We are sorry, but the return of these items is not possible.
• We use the S200S – RF BLOCKING FABRIC for our sock hat and scarf

 

Screening/Blocking Tests

• Please note that the following outcomes is for the range that was tested according to our ability or manufacturer’s ability.
  It is possible the fabric might be able to screen/block also higher/lower frequencies.
• EMF Screening according to the manufacturer’s datasheet: -30 to -40 dB across 1GHz-10GHz.
• Our Demo EMF screening tests between 300 MHz and 5000 MHz in %(dB):
  • 0 degrees- AVR=99.97%(39.34dB), Low=99.89%(29.8dB), Max=99.99%(49.7dB)
  • 90 degrees – AVR=99.92%(33.3dB), Low=99.76%(26.3dB), Max=99.99%(43dB)
  • ress here for the full demo report….

    

     

• * For professional and military use, we recommend to order one linear meter as a sample and then test it for your own need in your lab.
• * For EHS people we recommend to first order a BC190 or BC240 and see how it feels, before buying many items or fabric.

 

5 tests cycles of the fabric in a self build testing chamber, with DECT 1.8GHz as a source and a CORNET ED88TPLUS as a meter.

The tests were done on a new piece of fabric that case covered with plastic sheeting to make it easier to handle (I later learned that the covering decrease the level or reduction/blocking by a small percentage.

Date	28/10/2018
Time	15:12
Source	DECT 1.8GHz
Source location	middle back
Meter/spectrum analyzer	CORNET ED88TPLUS
Background level	0.000578
Level without protection
White paper with lamination
Level without protection 2
White paper with lamination 2
Type of protection	S200S Metal side to the source
Without Protection test #1	87.4
With Protection test #1	0.694
Reduction in % test #1	99.20594966
Without Protection test #2	89.5
With Protection test #2	0.694
Reduction in % test #2	99.22458101
Without Protection test #3	89.5
With Protection test #3	0.663
Reduction in % test #3	99.25921788
Without Protection test #4	87.4
With Protection test #4	0.679
Reduction in % test #4	99.22311213
Without Protection test #5	87.4
With Protection test #5	0.694
Reduction in % test #5	99.20594966
Worse case Reduction %	99.20594966

Tested in a self-build testing chamber, with DECT 1.8GHz as a source and a CORNET ED88TPLUS as a meter.

The tests were done again and again on the same piece of fabric, without a plastic sheeting, that was washed in a washing machine, with normal waters from the tap and with soap (Persil Gel), in 40-60 celsius degrees.

Tests were done between 14-17/11/2018

Background levels were lower than 0.0005mW/m2

Below is a summary of the outcomes

CYCLE NUMBER	1 60″C	2 40″C	2 tilt 90 degrees	3 60″C	4 60″C	5 60″C	6 40″C
WITHOUT	87.4	162.9	162.9	87.4	159.2	178	166.7
WITH S200S	0.865	0.5648	0.711	0.05	0.16	0.17	0.2
Att %	99.01029748	99.65328422	99.56353591	99.94279176	99.89949749	99.90449438	99.880024
Att dB	-20.04495325	-21.89616745	-20.89641832	-32.42541428	-27.3739145	-27.11062511	-26.40481437