Technical Bulletin

Designing a Dual Stage Vent

with De

WAL® DW232PA

Membranes

For good pressure equalization and appropriate

burst:

1. Using your design criteria for temperature

change over time for normal venting

operation, the size of the vented enclosure,

and your enclosure’s designed maximum

pressure, use the Airflow vs. Pressure graph to

determine which venting material best fits

your needs. Higher airflow enables better

equalization.

2. Use the Deflection vs. Pressure graph to find

the deflection of your chosen vent material

from Step 1, and your enclosure designed

maximum pressure to predict your burst pin

placement, less than the predicted deflection.

3. Test your design.

Example:

You have a 10-liter enclosure that will normally see

a 27 C temperature change over an hour, and your

enclosure can withstand .5 kPa pressure. You will

need 1 liter/hr airflow ( 10 liters x 27/273 C).

Step 1: DeWAL® DW232PA-10 will allow 1liter/hr

airflow without exceeding the .5 kPa maximum.

Step 2: DeWAL® DW232PA-10 will deflect by 3mm

(in a 38mm diameter vent). The burst pin should

be placed closer than 3mm to the membrane.

The information contained in this Technical Bulletin is intended to assist you in designing with Rogers’ Elastomeric

Material

Solutions.

is not

intended to

and does not create

any

warranties, express or implied, including any

warranty of

merchantability or fitness for a particular purpose or that the

results shown in this application note will be achieved by a user for a particular purpose. The user should determine the suitability of Rogers

Elastomeric Material Solutions for each applicatio

n. The Rogers and DeWAL logos and DeWAL are trademarks of Rogers Corporatio n or one of

its