Rubber Glass II for Glass and Ice Effects

                                                  
Rubber Glass II is a product of smooth-on.com. It is a silicon rubber used to mimic ice and glass. It is a bouncy, ripable substance. It is NOT to be used as a breakable like candy glass. However, it can be used to create the effect of broken glass. Rubber glass rips/crumbles apart easily.

Safety First:
Use a Respirator that is

"OSHA respirator regulations 29 CFR 1910.134 and European

Standard EN 149; wear an MSHA/NIOSH or European Standard EN149 approved respirator." Official MSDS

Also wear vynel gloves and safety googles.
Rubber Glass is a Tin based silicon. Do NOT use it with platinum based silicons. This will cause a chemical reaction which will not yield the product you want.

Compatible Molds & Mold Products:
Oomo (all kinds) by smooth on
Mold Max 20 by smooth on
An Ice Tray
Create a mold with a object for an ice scuplture, replicate diamods or ice art. With an home made mold use one of the above silicon products to create. Prep the mold with a pour spout and small air escape hole. If you want quick ice cubes use a regular ice tray. Prepare your mold with All Purpose Mold Release or Mold Release 200.

Rubber Glass II comes in a trial pack with four bottles. 3 are Part A and 1 is part B.  The mix ratio is 3 Part A : 1 part B. At a quick glance it may be good to use your bottles all at once. However, if you are making a small project and want to conserve your silicon for later, use one A bottle at a time. Rubber Glass II is a sensative silicon when exposed to temperature. After leaving some leftovers in open bottles in cold weather and then pouring samples, I discovered my second batch of ice cubes were very different from the first.

 On the Left: Batch 1: It is a very clear and crisp turn out. It crumbles easily, leaving angled rips.
On the Right Batch 2: Somewhat cloudy and more rubbery feeling ice cube. It rips easily, but with rounded rips.

Mix thoroughly but not to quickly. Fold the clear silicon into the more liquidy part B instead of stirring. Gently pour into mold. Tap out air bubbles if possible to cause them to rise out of the escape spout. Let set. Cure Time is 16 hours. Pourly mixed silicon will NEVER cure and will be gooey. However, will careful measurements Rubber Glass II is predictable and lovely.