Aircast 3700 A/B is a two component modified RTV compound designed for use in the manufacturing of flexible molds and mandrels. Aircast 3700 A/B is also ideal for casting pressure pads. The high differential in thermal coefficient of expansion between Aircast 3700 A/B and a mold makes it useful in trapped rubber molding.
• Pressure intensifiers improve the molded finish of parts reducing cost of rework and scrap parts.
• Thermal expansion properties can be used to develop additional pressure to aid molding parts.
• Aircast can be cured at room temperature, reducing cost of intensifier molds and improving accuracy.
| Properties - uncured: | | Test method |
Base/Curing agent mix ratio by weight
| 100 parts A to 12 parts B | |
Base colour/ Curing agent colour
| Tan/ Blue
| |
Viscosity at 77°F (25°C) (mixed)
| 70,000 cps
| |
| Properties - cured 24 hrs at 77°F (25°C): | | |
| Density | 0.045 lb/in3 (1.25 g/cm3) | ASTM D 792 |
| Maximum use temperature | 232°C (450°F) | |
| Elongation at break | 180 % | ASTM D412 |
| Hardness | 50 +/-5 Shore A | ASTM D2240 |
| Compression set (22 hrs at 350°F or 177°C) | 10 % | ASTM D395 |
| Coef. of thermal expansion | 140x10-6 in/in/°F (252x10-6 cm/cm/°C)
| ASTM E831-14
|
| Shelf life | 12 months from date of shipment when
stored in original packaging at 72°F (22°C) | |
| Packaging | Part A | Part B |
|---|
| 9 lb (4.08 kg) Kit | 8 lbs (3.63 kg) | 1 lb (0.45 kg) |
| 45 lb (20.42 kg) Kit | 40 lbs (18.14 kg) | 5 lbs (2.27 kg) |
Recommended Mixing Instructions:
Mix 100 parts base (Part A) with 12 parts curing agent (Part B) by weight. Place the material in a vacuum chamber to remove trapped air. As vacuum is drawn, the material will expand as much as four times its original volume. After 1 - 2 minutes, the material will recede to its original volume. Remove from vacuum chamber and carefully stir material to assist pouring.
Recommended Cures:
At 77°F (25°C), the pot life is 1 hour. Cure time: 24 hours. Nominally no cure shrinkage.
At 100°F (38°C), the pot life is 30 minutes. Cure time: 2 hours. Nominally 0.3% cure shrinkage.
At 150°F (65°C), the pot life is 10 minutes. Cure time: 30 minutes. Nominally 0.5% cure shrinkage.
At 300°F (149°C), the cure time is 5 minutes. Nominally 1% cure shrinkage.
• For mold release, certain mold materials can cause curing inhibition, this can be checked by brushing a small quantity of Aircast 3700 over a localized area of the surface to be reproduced. If the Aircast 3700 is gummy or uncured after the curing time has elapsed, the mold surface is acting as an inhibitor. Silicone release agents will cause inhibition and must not be used. PS Tapes such as Tooltec®, Toolwright, Wrightlease or Teflease MG2 can be used to provide a suitable tool release surface.
• Longer life can be achieved by covering molded Aircast 3700 with Teflease MG2 PS Tape.
• The maximum use temperature is dependent upon the duration at maximum temperature and is process specific, Airtech recommends testing prior to use.
Last updated : 2024-07-02
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.
