diff --git a/code/game/objects/items/stacks/sheets/sheet_types.dm b/code/game/objects/items/stacks/sheets/sheet_types.dm
index cd65dc6bc7..428db871d9 100644
--- a/code/game/objects/items/stacks/sheets/sheet_types.dm
+++ b/code/game/objects/items/stacks/sheets/sheet_types.dm
@@ -808,7 +808,7 @@ GLOBAL_LIST_INIT(plastic_recipes, list(
 	new /datum/stack_recipe("water bottle", /obj/item/reagent_containers/glass/beaker/waterbottle/empty), \
 	new /datum/stack_recipe("large water bottle", /obj/item/reagent_containers/glass/beaker/waterbottle/large/empty,3), \
 	new /datum/stack_recipe("shower curtain", /obj/structure/curtain, 10, time = 10, one_per_turf = 1, on_floor = 1), \
-	new /datum/stack_recipe("duct", /obj/item/stack/ducts,1), \
+	new /datum/stack_recipe("duct", /obj/item/stack/ducts, 1, 1, 20), \
 	new /datum/stack_recipe("laser pointer case", /obj/item/glasswork/glass_base/laserpointer_shell, 30), \
 	new /datum/stack_recipe("wet floor sign", /obj/item/clothing/suit/caution, 2)))
 
diff --git a/code/modules/plumbing/ducts.dm b/code/modules/plumbing/ducts.dm
index 8a27f2669c..59816544ab 100644
--- a/code/modules/plumbing/ducts.dm
+++ b/code/modules/plumbing/ducts.dm
@@ -388,7 +388,7 @@ All the important duct code:
 	singular_name = "duct"
 	icon = 'icons/obj/plumbing/fluid_ducts.dmi'
 	icon_state = "ducts"
-	custom_materials = list(/datum/material/iron=500)
+	custom_materials = list(/datum/material/plastic = 400)
 	w_class = WEIGHT_CLASS_TINY
 	novariants = FALSE
 	max_amount = 50
diff --git a/code/modules/research/machinery/_production.dm b/code/modules/research/machinery/_production.dm
index 7862f24715..30d0c70566 100644
--- a/code/modules/research/machinery/_production.dm
+++ b/code/modules/research/machinery/_production.dm
@@ -120,7 +120,7 @@
 	return round(A / max(1, all_materials[mat] * ef))
 
 /obj/machinery/rnd/production/proc/efficient_with(path)
-	return !ispath(path, /obj/item/stack/sheet) && !ispath(path, /obj/item/stack/ore/bluespace_crystal)
+	return !ispath(path, /obj/item/stack/sheet) && !ispath(path, /obj/item/stack/ore/bluespace_crystal) && !ispath(path, /obj/item/stack/ducts)
 
 /obj/machinery/rnd/production/proc/user_try_print_id(id, amount)
 	if((!istype(linked_console) && requires_console) || !id)