NEW PRODUCTS
SC-92: Single Component, Aliphatic, Water-based Coating.
TC-295: 6# Density, Flexible, Fire Retardent Foam. Meets the US DOT FMVSS 302.
TC-896: 82 Shore D, ABS-like material, 240° HDT and excellent impact strength. |
BJB's
UL 94V-0
Rated Materials
UL certification#
E174527
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Dear Dana,
Summer is almost over, vacations have been taken, and kids are back in school! One of our technical staff, Troy Peterson, just returned from the F5D Radio Controlled Pylon Racing World Championships. This contest has contestants from 17 countries around the world. There are 3-4 planes in the air at once reaching speeds up to 200 mph (320 km/h) and 45,000 propeller rpm. They do ten laps around a ¼ mile track in approximately sixty seconds.
Plane built by Team USA | The plane for Team USA was built with molds and composite airframe components using BJB products (TC-1611, TC-1600, and TC-8200). Custom carbon fiber propellers were made using TC-1650 molds and TC-1600 laminating resin. Congratulations goes out to Team USA who finished with a bronze medal. |
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Don't Be Inhibited!
Q: What is Cure Inhibition in silicones? A: Some materials can have chemical incompatibilities when poured into or up against other materials causing an uncured, sticky mess. For example, platinum silicones may show inhibition characteristics against natural rubbers, cyanoacrylates, tape residue, sulfur based clays, and some urethanes. Whenever in doubt, a small side test is always recommended. Q: What is Cure Inhibition in Urethanes?
A: Certain urethane systems may be affected by the type of silicone mold you cast into. Tin based silicones (condensation cured) are known to cause issues with many Shore A Elastomer urethane systems and also Aliphatic urethanes (e.g. our Water Clear materials). Silicone mold material must be carefully selected depending on the urethane system you plan to cast. Casting a urethane into an incompatible silicone can be an expensive disaster; both money and time.
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Color Stability vs. UV Stability
Do they mean the same thing? NO
UV stability refers to the polymer breakdown of a material when exposed to UV light.
Color stability refers to how colorfast a product is as it ages. UV exposure may affect the color stability at an accelerated rate but it is not the sole contributor to it.
BJB's Water Clear series are the only systems we will guarantee uniform color. All other materials can vary from batch to batch. This is true in cured form and in liquid form. What often confuses customers is that they receive a cured coupon of one of our non-WC materials and assume that the color they see is what they can always expect. They may sort through a cured sample chain until they see a material that has the translucency they need and choose it for their color matching needs.
Raw ingredients from these systems can vary from batch to batch, and the material can self-oxidize sitting in a container on the shelf. This means that the cured coupon made from a fresh batch of material may not be the same color as a coupon made from material that is six months old. So if color is a concern, be aware of the limitations of certain materials and what to expect as that material ages. |
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