Fixes (see dev discussion)

code/modules/reagents/chemistry/holder.dm

@@ -931,7 +931,8 @@
 				pH = 7
 			//In practice this is really confusing and players feel like it randomly melts their beakers, but I'm not sure how else to handle it. We'll see how it goes and I can remove this if it confuses people.
 			else
-				pH = (((pH - R.pH) / total_volume) * amount) + pH
+				if (((pH > R.pH) && (pH <= 7)) || ((pH < R.pH) && (pH >= 7)))
+					pH = (((pH - R.pH) / total_volume) * amount) + pH
 			if(istype(my_atom, /obj/item/reagent_containers/))
 				var/obj/item/reagent_containers/RC = my_atom
 				RC.pH_check()//checks beaker resilience)

code/modules/reagents/reagent_containers.dm

@@ -16,6 +16,7 @@
 	var/disease_amount = 20
 	var/spillable = FALSE
 	var/beaker_weakness_bitflag = NONE//Bitflag!
+	var/container_HP = 2
 
 /obj/item/reagent_containers/Initialize(mapload, vol)
 	. = ..()
@@ -160,7 +161,13 @@
 		if((reagents.pH < 0.5) || (reagents.pH > 13.5))
 			var/list/seen = viewers(5, get_turf(src))
 			var/iconhtml = icon2html(src, seen)
-			for(var/mob/M in seen)
-				to_chat(M, "<span class='notice'>[iconhtml] \The [src]'s melts from the extreme pH!</span>")
-				playsound(get_turf(src), 'sound/FermiChem/acidmelt.ogg', 80, 1)
-			qdel(src)
+			container_HP--
+			if(container_HP <= 0)
+				for(var/mob/M in seen)
+					to_chat(M, "<span class='notice'>[iconhtml] \The [src]'s melts from the extreme pH!</span>")
+					playsound(get_turf(src), 'sound/FermiChem/acidmelt.ogg', 80, 1)
+				qdel(src)
+			else
+				for(var/mob/M in seen)
+					to_chat(M, "<span class='notice'>[iconhtml] \The [src]'s is damaged by the extreme pH and begins to deform!</span>")
+					playsound(get_turf(src), 'sound/FermiChem/bufferadd.ogg', 50, 1)

code/modules/reagents/reagent_containers/glass.dm

@@ -6,6 +6,7 @@
 	reagent_flags = OPENCONTAINER
 	spillable = TRUE
 	resistance_flags = ACID_PROOF
+	container_HP = 2
 
 
 /obj/item/reagent_containers/glass/attack(mob/M, mob/user, obj/target)
@@ -114,6 +115,7 @@
 	item_state = "beaker"
 	materials = list(MAT_GLASS=500)
 	beaker_weakness_bitflag = PH_WEAK
+	container_HP = 3
 
 /obj/item/reagent_containers/glass/beaker/Initialize()
 	. = ..()
@@ -165,6 +167,7 @@
 	volume = 100
 	amount_per_transfer_from_this = 10
 	possible_transfer_amounts = list(5,10,15,20,25,30,50,100)
+	container_HP = 4
 
 /obj/item/reagent_containers/glass/beaker/plastic
 	name = "x-large beaker"
@@ -207,6 +210,7 @@
 	reagent_flags = OPENCONTAINER | NO_REACT
 	volume = 50
 	amount_per_transfer_from_this = 10
+	container_HP = 10//shouldn't be needed
 
 /obj/item/reagent_containers/glass/beaker/noreact/Initialize()
 	beaker_weakness_bitflag &= ~PH_WEAK
@@ -223,6 +227,7 @@
 	volume = 300
 	amount_per_transfer_from_this = 10
 	possible_transfer_amounts = list(5,10,15,20,25,30,50,100,300)
+	container_HP = 5
 
 /obj/item/reagent_containers/glass/beaker/cryoxadone
 	list_reagents = list("cryoxadone" = 30)
@@ -279,6 +284,7 @@
 		SLOT_L_STORE, SLOT_R_STORE,\
 		SLOT_GENERC_DEXTROUS_STORAGE
 	)
+	container_HP = 2
 
 /obj/item/reagent_containers/glass/bucket/Initialize()
 	beaker_weakness_bitflag |= TEMP_WEAK
@@ -332,6 +338,7 @@
 	materials = list(MAT_GLASS=0)
 	volume = 50
 	amount_per_transfer_from_this = 10
+	container_HP = 1
 
 /obj/item/reagent_containers/glass/beaker/waterbottle/Initialize()
 	beaker_weakness_bitflag |= TEMP_WEAK
@@ -347,6 +354,7 @@
 	list_reagents = list("water" = 100)
 	volume = 100
 	amount_per_transfer_from_this = 20
+	container_HP = 1
 
 /obj/item/reagent_containers/glass/beaker/waterbottle/large/empty
 	list_reagents = list()