For most high-tear tin cure silicones, vacuuming the material to minimize air bubbles is required. For people that don’t own a vacuum pump and vacuum chamber, however, spending $800 – $1,000 can be a barrier to using these materials.

What is Oomoo?

OOMOO™ offers very low viscosity for easy mixing and pouring, and vacuum degassing is usually not necessary. Suitable for a variety of art-related and industrial applications including making moulds for sculpture and prototype reproduction, casting plaster, resins and wax.

Is Oomoo 30 tin cure?

No Vacuuming – No Scale – Easy To Use . . . OOMOO™ 30 is an easy to use tin cure silicone rubber compound that features a convenient one-to-one by volume mix ratio (no scale necessary). It has low viscosity for easy mixing and pouring . . . vacuum degassing is not necessary.

How much vacuum do you need to Degas silicone?

Vacuum pump must pull 29 inches of mercury (inHg, or 1 bar). After silicone falls, vacuum for an additional 90 seconds. Do not over vacuum! Turn off pump.

Do you need a vacuum chamber for silicone?

Many mixed silicone rubbers (A+B) are thick and have a high viscosity. Silicones with a viscosity above 15,000 centipoise should be vacuumed to avoid air entrapment and bubbles in the finished mold. These bubbles will be transferred to your finished casting which is unsightly and undesirable.

What is the difference between Oomoo 25 and Oomoo 30?

Oomoo 30 has a pot life of 30 minutes and takes about six hours to fully cure. Oomoo 25 has a 15 minute pot life and a 75 minute cure time. Both exhibit the same strength, though Oomoo 30 will be slightly harder after it cures. 1 of 1 found this helpful.

How long does Oomoo take to cure?

75-minute
OOMOO™ 25 has a 15-minute pot life and 75-minute cure time.

What is a vacuum degasser?

The vacuum degasser removes all gases from the system through continuously returning water to it that has extremely low concentrations of gases. Water with the lowest concentrations of dissolved gases is found in the vacuum degasser.

What is the best vacuum pump for degassing silicone?

Checkout Our Top Pick Of Best Vacuum Pump For Degassing Silicone. 1. BACOENG 3 Gallon Vacuum Silicone gasket to be used over 10,000 times without deterioration. Vacuum Pump Voltage – 110V 60HZ Power: 1/4 HP Single Stage 3.6CFM 2. ABLAZE 5 Gallon Stainless Steel 3. BACOENG 3 Gallon Tempered Glass 5. Bestauto 3 Gallon Vacuum 6.

How do you use a vacuum cleaner to clean silicone?

Place mixing container into vacuum chamber. Ensure a tight seal between lid gasket and chamber. Turn on vacuum pump. Close vacuum valve to enable air flow. Vacuum pump must pull 29 inches of mercury (inHg, or 1 bar). After silicone falls, vacuum for an additional 90 seconds. Do not over vacuum! Turn off pump.

What is the difference between silicone and poridex based degassers?

Silicone based degassers offer the highest flow rate capabilities for water based systems such as diagnostic and life science instrumentation to improve dispense accuracy and reliability. Poridex based products provide rapid bubble remove for locations where bubble introduction cannot be avoided. For Valves and Degassers a surcharge may apply.

What is the difference between sysystec AF and silicone based degassers?

Systec AF based degassers offer the widest range of chemical compatibility and are used to eliminate retention shifts and baseline fluctuations. Silicone based degassers offer the highest flow rate capabilities for water based systems such as diagnostic and life science instrumentation to improve dispense accuracy and reliability.