Airtech 4140 is a high grade silicone rubber that offers high reversion resistance and strength. It provides superior performance for manufacture of rubber tooling such as bladders, pressure intensifiers, and vacuum bags. The physical properties of the material are comparable to Airtech 1050 when fully cured and post cured according to the instructions below.
• Cured silicone rubber caul sheets can improve part quality on the bag side of molded parts.
• Molded intensifiers can be used over complex surfaces to produce smooth finish.
• Intensifiers can improve bag side quality and reduce rework.
| Properties listed are typical for the fully cured material | Test method |
| Material type | Uncured silicone rubber | |
| Colour | Red | |
| Hardness | 50+/-5 Shore A | ASTM D2240 |
| Maximum use temperature | 450°F (232°C) | |
| Elongation at break | 700 % | ASTM D412 |
| Tensile strength | 1400 psi (9.65 MPa) | ASTM D412 die A |
| Shelf life | 6 months when stored below 40°F (4°C)
30 days when stored below 72°F (22°C)
from date of shipment when stored in original packaging |
| Thickness | Width | Length | Packaging Type
|
|---|
| 0.040 inch (1.02 mm) | 36 inches (91.4 cm) | 25 yards (22.9 m) | roll |
| 0.060 inch (1.52 mm) | 36 inches (91.4 cm) | 25 yards (22.9 m) | roll |
Cure Instructions:
• Apply Release Ease® 234 TFP over uncured Airtech 4140 product.
• Cover with A4000 or Wrightlon® 5200 and Airweave® N7.
• Bag with Ipplon® KM1300 or equivalent.
• Apply full vacuum, ramp to 350°F (177°C) and hold for 30 minutes, based on lagging thermocouple placed on
tool.
• Allow to cool to 120°F (49°C) before removal from tool.
• For lower temperature cures, simply increase the cure time 30 minutes per 50°F (10°C) drop in temperature
from 350°F (177°C).
• Minimum cure temperature is 250°F (121°C).
• Shorter rolls available on special order.
• Any silicone rubber has the potential to transfer. Silicone transfer investigation should be done by the user.
• The maximum use temperature is dependent upon the duration at maximum temperature and is process
specific, Airtech recommends testing prior to use.
Last updated : 2024-04-29
As the conditions or methods of use, including storage, are beyond our control, Airtech International, Inc. does not assume responsibility for the performance of this material for any particular use. The material is sold "as is". Airtech International, Inc. disclaims, and buyer waives, any and all implied warranties, including without limitation the implied warranties of merchantability and of fitness for particular use. The information contained herein represents typical properties and should not be used for specification purposes. Any translation is provided for your convenience only. The official language is English and the official law is California, USA.
