Butterfly test — — Diagram

Breaking time test

This test project is used to test  two component structural sealant curing speed.

To determine the dosage proportion between components A and B, this project must be tested before the two component structural sealant construction.

Put uniform mixing structural sealant appropriate amount into a beaker or other solvent, immerse a small round rod or scraper into a portion of the sealant,and start timing from sealant mixing. Extract the small round rod (scraper) from the sealant every 5 minutes,

and observe whether the torn part of the sealant has suddenly broken or not.

If no breakage occurs, immerse the small round rod (scraper) into the sealant again, and then extract it from the sealant every 5 minutes.

Repeat this operation until the sealant breaks, and record the time from timer starting to breaking time.

Two-component sealant’s sudden break time of a normal proportion should be between 20 and 90 minutes, otherwise the dosage ratio of components A and B should be readjusted.

Our two-component silicone structural sealant OM908 normal dosage ratio is A: B=10:1 by volume (weight ratio: 13:1). Users can adjust themselves between 8:1 to 12:1 (weight ratio 10:1 to 16:1).

The higher B component proportion usage, the shorter the sudden breaking time.

Remark:Component B has high reactivity and is prone to failure due to hydrolysis. Therefore, it should not be exposed to air for a long time during use and should be sealed and stored.

Below is tensile break time test diagram:

Butterfly test record