NATIONAL BUREAU OF STANDARDS REPORT

NBS PROJECT NBS REPORT

tm wmm m mm.m Mmms ss

m mmn m&mMM faiwe

ife'i

im

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

The publicati

unless permis 25.D.C. Sui

cally prepare

Approved ole or In part, is prohibited for public release by the

Director of the National Institute of standards, Washington Standards and Technology (NIST)

on October 9, 201 5.

olar report for its own use.

tm imca? OF MmmB m wjs'BE

OF SOLID FIMS

XmBM^

A brief stMj iaaa,«j of th€ effects

Of water, Isoth wife mA. withoiit a wetting

ageat, oa Vm burriing rate of sollcl px^pellmt

rocket fi^l*

immmmou

it appears timt mcler soae coi:i41tia^iJ5 tiic

bUTiiiag of solii fa^opeXlaiits la da^aagod or ^sfired

slaailes atay bo ’liroug’ot wd^T control hj t.lj® early

appllGatloa of large qmntitles of imtor to tlm sarfac©

of the propellant* t^m mmmBsmtm mre wmd^ to

whether or not wetting agents rntgiit be ex^cteO to iaox-ease

the #ffeotiven®s.s of tlais of control*

mimmd tmf. immm

fhe propellant furnished by the Iairy was ^

giliieti missile rocket propellant cast in cylin'irieal

rods i inch la diaaieter siid about 0sm foot iri length*

Ihese rods were cut into speciJams of two sisess

(a) right eyiifiders t lacli in dla^-ter and li- iacimu

in length and iW smell cylinders quartered longitmdiimlly

to proSmee spe-eiiaens of qmrter'-eircmlar cross section

and If inches In texgth*

- Tap water did aot wot the surfae® of the propella^it

at room te^erature* After one minute of isMcrsion and

15 sec of draining^ only a few gloML.es ^ about 1 or 2

laillimoters ii.i dtas^ter, adhered to t!i# surfaeo.

l;^rjiiag propellant sables of both slges aoseribod

wore readily extlasuishod by immersion lu water. It

api:®arod, that the water m% the !^t parts of the saaiple.

ibis ^ght be expected in Tim of the i^ual variation of

sm^feee tension with temperature.

several differment wettli-ig agents wc.re used in

recoaRiEhded conceiitrstions m& In each eas^ a t-liia film
vCl/^^i-'i .li\f'^J^rX'.t^-^r'h'^ C^Z^t^.;.. *3.iJ

t^xl$ to ^:. :^;..i:#>;0^ m SmaiSk^ i^iS- iUcjf

^ t-W% s mi>tn

i'i-4 1

*xt' ml ;|i-lr :f^u i<^x#:;osr jm^r0 M \m

?%y,< to

^3..^'ro£:.t f« .^^i| ^myrniirr

J h^-'-t^Mi aw i^f f^j.i&ix-rw'^s :^^j3.£X:s«uf*0'Sq ^r^'i

ellsisl^.

*1^1 i^l m-Gitl t

£'".?>: 1:0 ?s^^4|iKjv?K|^ Ofiil '5*a4?iir 0#ifSfiU ml :.’;mi-.| J. (i^;/ ^oif% C^) i-M',5i cil

•.rf?^£i;i^,#^«l' *lP m.i&J.i^m Sm .fejs- kt^. t^faw qsfei' • i^kis'imml to ^x'ks, -jg

S t 4WM&. ^rnMiioi^ r-^%-% g. "olrfi??-

, t5 lo ;;i pM, of i.l o-^i^fej::Xij£i:s‘!'

&e»^i:,c:^s;^:.»- sn:si^ ml'^, to. ^,iijymx.

ti lil moi'S'lo^J' • ~:!^^:i>^lsi::^S IXX^ %Xt^3^x '. VO\-J

or'i 'ici -ij^mq -i-pil ^XJ ,fm:x ;:5vO^

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i.l 3-ym |i^'r:.-^«>‘-:

^ail; rU-xf .3 xvaao oX Oo-
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of ti'eated to ail swttmm tmmrQm at roOiS

tssaperatur-P^. Tm folloi^lag wttlng wsm mmU

TrltOii X 100

A^^aoX .0*1 Jtm a021A

0 iisx

1

0-.2 i>€5re^»i

2 pasro^i-t.

1

Am m.i»immm

fh)& effect of oa tbe rato of X'laai© »ps*o&c2

was ia the foliowli'ig way* the frop©lia.at

apecifi^a was isiaiersed to a 4epth of I4- laoh If s^c.

This left a dry leiiigUi of 1 iaah for the

of flai^e spread* spe^il^r was dmlmd ig see

before testing* A ssiali steel pla ioserted ia tiie base

of the speoiiiien s^poi^tea it with a wAriimm of siis^faoe

aohtajet tefag ti^e draialjig and s^hseqijeat hiiriiiag. Tim

Bj^cimu 03?iea‘t#d witts th# loiigAtndi^ml a^s vertleal

aM with tlie d3?y se^eht at %m top* Tm spiioi»i was

l|iiit«4 oil ti'iis top s:iirfa€e .tii®’ time required for tbs

tmm to sprea^I to the battOiia of the s|>#elma was

recorded, ^mh tests were rm oa at least fi¥s 0ao-.li of

the t^itreaied speeimeiss, .speoimeas i»praed in watery

aM isKm’sed la the’ yaidom wettlag mln%lom*

tim clifforenoes between the effeets of the varfoua wetting

agents was xK»t oonsidei^ Significant l^i ylew of tlie

proMhle erxmr of U10 aiethoi* Sines in mmrj ease the

upp^T part of the apeeimen was mitreatod.5 -the t-i,^ rs»^

qmrsd to l3fttP:n that’ part# i*#* ooe-si^^th of tii.® tia^ to

!s«irn, m. mtreated S|wtoi^n# was sstbtraetod froa the total

t'lai© to obtain tbm tim reqiiirod. for the flam to ©proa;4 dowwmd aerosss the treated s.hrfaoe* the rates of fl.am

spread ar# ta'halated belowt.

freatmat

treafemiit

'iiiatsr

Vettiog solution

of all)

hate of Flam i.pfoad

c-/li>idi:'?rs

a/cr' « ’’i5 • OCJ^ Xii* "~i a/y «'id*'

lh*/s#e im*cent iii*/see pere.ent

0*054 100 0*10 100

*04^ m .045 53

n • 050 31
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Th® diffareac^s to, ti-i® r©»«lts for ttm two

<31£X«r©iit speedLa^u shapes attrife«»t®d to tm

dlff®r®iao« la tl‘£® ratio of lateral area to voltr^, 'I’a© ratios are gi^ea la tm tateiO'.

Siaoe ao sigxxifieaat dilf'ereaees wre fouarl betwea

the effect of tm various wettiag ageats lo redueiag the

fla.^ spread rate, tm retXmd mas\irean5.ats of tiie

differeaces la wettiag were mm* Cmttmt itagl#

iteats woiild reveal ®ueh differences, if mif* iSo i^&sare--

meats ii^re m&m of the viscosity of tm wettiug solHtioas

sitaouga It my fee aa ia^rtaiit property la deteraliiiiig

tlm effectiveness ia actml fire-fig^hti;^^. fXm mr-m

viscous solutions s^ght form a thioier i^er on tm

propeliaat aw^face with a greater eooliag effect-* On

tm other iimd, laoreased Tlseoslty might retard tJia flow

effaetlvely delay tti® application of extltigulshlag

ageat during the irueipleat stage when .aiiy delay might

disastrous mnseqmnem- t'm iacrmae ia Imri^ag rate

mmmpmxfiMg iaoreased. prosswe laigdt fee avoided fey

sufflcleat vemtiag of the space csootaiiilLsg the pro,pellaat.

It my fee eoaolaied tfeati

1* Furiiiag solid ^poi^llicit of %'m type md sise

tested may be esctlaguisifced fey l-si^rsion in

water •

a* |5rsse£io# of water on tti® swfaee of tm

propollmt retards s^oail- aottoeafeXy.

3. tm Jim of mf of the wetting ageats tested

with mter ^d.-ll ^tirrialiy Incremse its

effeotiTe:'^^## in retardi^iii; flsi^ spread*

4. tm- effectiveness of wmtm m wettiiig solutions

irifetardiijg spread Irmrmmm with iisrrease

- ia tike ratio of mm. to voliMe of tm propeiiaat

grain*

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