Differences

This shows you the differences between two versions of the page.

--- guides:materials [2007/02/13 20:48] – rocketboy
+++ guides:materials [2013/01/13 09:27] (current) – [Glues] rocketboy
@@ Line 6: / Line 6: @@
-==== Expanded Polystyrene (EP) ====
+==== Expanded Polystyrene ====
 Typically white foam made from beads - used for packing - density 15 to 45Kg/cu m - thermal conductivity 33mW/mK (for typical 20Kg/cu m foam). Can be cut with a [[guides:Hot Wire Cutter]].
-There are two types of EP - //Open Cell// and //Closed Cell//.  Open cell is where there are gaps between the beads, and closed cell where there are not. Open cell is not waterproof and closed cell is (as in polystyrene cups).
+There are two types of Expanded Polystyrene - //Open Cell// and //Closed Cell//.  Open cell is where there are gaps between the beads, and closed cell where there are not. Open cell is not waterproof and closed cell is (as in polystyrene cups).
@@ Line 17: / Line 19: @@
-==== Styrofoam ====
-Styrofoam is a trademark name (Dow) for extruded polystyrene thermal insulation material used in building construction - light blue with foam texture - density 32Kg/cu m - thermal conductivity 27mW/mK. Significantly more rigid than EP and can be machined (with care). Can be cut with a [[guides:Hot Wire Cutter]].
+==== Extruded Polystyrene ====
+Extruded polystyrene is a thermal insulation material used in building construction. There are a couple of brands: Styrofoam by Dow and Polyfoam by Kanuf.  Styrofoam (density 32Kg/cu m - thermal conductivity 27mW/mK) is light blue or pink in colour, while Polyfoam (density 38kg/m3 - thermal conductivity 35 mW/mK) tends to be orange or beige.
+Extruded polystyrene has a foam texture, moisture resistant, significantly more rigid than Expanded Polystyrene and can be machined (with care). Can be cut with a [[guides:Hot Wire Cutter]].
@@ Line 26: / Line 31: @@
 **Cutting:** STYROFOAM™ brand foam cuts easily with a serrated knife, hacksaw, etc.  Wax the knife blade with an old candle for easier, smoother cuts
-**Painting:** Paint with an acrylic craft paint. Solvent-based paints may damage the foam
+**Painting:** Paint with an acrylic craft paint. Solvent-based paints may damage the foam.  Daler Rowney System 3 acrylic paint works well and comes in Fluorescent Pink (other colours are available).
 **Gluing:** For a fast, sure bond, use a low-temperature glue gun. Hot glue guns can be used but the hot glue may melt a small portion of the foam
@@ Line 35: / Line 40: @@
 Polystyrene foam tends to be difficult to glue - because the solvents in some glues attack it. Here are 3 glues that work well and don't attack polystyrene.
+**UHU Por glue** - this is specifically for polystyrene foam.  Coat each part, wait for 10 minutes then press together.
 **PVA wood glue** - this works but you have to allow a long time for it to dry - especially on thick sections. Allow at least a day when working with sections of 1" or more.
@@ Line 42: / Line 49: @@
 **Silicone Rubber** - as used for sealing plumbing & worktops - allow 24 hours to set.
-**Hot Glue Gun** - set quickly and are relatively easy to apply.
+**Hot Glue Gun** - set quickly and are relatively easy to apply. Use the gun on its low heat setting.
@@ Line 54: / Line 61: @@
 Indicative strength (natural colour):
 ^Diameter^Breaking Strain^
+|1.0 mm|22 Kg|
+|1.2 mm|35 Kg|
 |1.5 mm|45 Kg|
 |2.4 mm|130 Kg|
@@ Line 65: / Line 74: @@
 Braided cord works better than twine as twine tends to twist/untwist during the flight - causing the payload to spin.
+===== Tapes =====
+==== 2" Wide Tape  ====
+Various 2" wide sticky tapes often used for covering payloads etc.
+^Tape Type^Weight (g/m)^
+|White Duck Duct| 12 |
+|Grey Generic Duct| 9 |
+|Black Cheap Generic Duct| 7 |
+|Ultratape single sided cloth tape| 7 |
+|Aluminium| 6 |
+|Spinnaker Repair| 5 |
+|Clear Packing (Staples)| 3.5 |
+|Pro-Gaff Fluourecent Pink Gaffer| 16g |