Document n9rY91Z3zqjmR7MQ4G8aNgOMz

^1 TORT COWS April 29# 1959 Ptoli Lab* Mr* L V* Rodanborn LIOH? AC0U37ICAL PLA3T2H J* R* Watt - nd Rot Zoehae Flattering Company oat Kossrs# A* L* Merer Ardraoro 0. 8* Abbey J* 0* Wise - twin Citieo Warren Irlah m m II* J* Zslsi - Ft* Dodge Refer to your lottor of 4/23/59* Results of aialjsla nadt oa the gypsua baaoooat aro aa follows! Combined water Insoluble 90} 16*20 jBP 2Hoeast ? Veraioullte and otbor Aold insolubles Linastons (by difference) 74*1 :o;7 Baaod on aa eatinated weight of 9 lbs. oul ft* for the vercleullte* there la approximately two eubic foot por 100 lbs* plastor* High 11 catena ooatoat Coy difforanoo) indloatoa 9 10 percent lino or limestone was addod* Baaoooat was not Tory hard but doubt if it has mioh to do with tbo bond falluro* la ny opinion# tho bond falluro was in aUprobability duo to addition of lino to tho aoouotloal plastor* Aa mentioned provioualy# tho addition of only about ono poreont lino affoota tho gel strongth of tho olay binder# It eausoa tho aooustioal plastor to *vator out* and bo abort working* It also tends to kill tho Conning action* Aa you know# at tho tins wo wore told lino was added on the job wo wore skeptical and requested a final report on tho Job* In answer to your question# wo fool that tho addition of lino should bo prohibited insofar aa possible* Any plasterer should bo advised that ho addt lino at hia own risk and that vo will aooopt no responsibility in easa of failure* This lo tho flrot instance wo know of whore lino was added to the aooustioal plastor* SGP 0019000