Specification Data Sheet

Architectural Weatherproofing ProductsU.S.A. • since 1862

PecoraNon-Staining, Ultra-Low Modulus Silicone Sealant

1. BASIC USES Pecora 890NST is designed primarily forsealing expansion and control joints inprecast concrete panels, architechturaland natural stone, metal curtainwalls,perimeter sealing of doors and windows,Exterior Insulation Finish Systems (EIFS)and numerous other areas requiring ahigh-performance sealant. It adherestenaciously to concrete, natural stones,masonry, steel, fluoropolymer paintedand powder coated aluminum, wood,vinyl and many other plastics, generallywithout need for a primer, and performsequally well in new or remedial construction.

2. MANUFACTURERPecora Corporation165 Wambold Road Harleysville, PA 19438

Phone: 215-723-6051800-523-6688

Fax: 215-721-0286Website: www.pecora.com

3. PRODUCT DESCRIPTIONPecora 890NST is a one-part, neutral-cur-ing, ultra low-modulus silicone sealant thatwill not stain natural stone such as marbleand granite and that reacts with atmosphericmoisture to form a durable, flexible build-ing sealant. Pecora 890NST performsexceptionally well under dynamic condi-tions due to its ultra-low modulus, highextension/ compression, recovery proper-ties and strong adhesion to most buildingmaterials and accommodates long-termmovement of +100-50% in properlydesigned joints.

Harsh weather conditions, rain, sleet, snow,sunlight and extreme temperatures, highozone concentrations and/or exposure tointense ultra violet rays have very littleeffect on the ultimate performance ofPecora 890NST even after years of suchexposure.

PACKAGING• 10.1 fl. oz. (300 ml) plastic cartridges• 20 fl. oz. (592 ml) sausages• 2-gallon (7.57 L) pails

COLOR• Black, Limestone, Precast, Charcoal Gray, Sandstone, Red Rock, Hartford Green,Tru-White, Aluminum Stone, Beige, Classic Bronze, Natural Stone, Anodized Aluminum.•Unlimited range of custom colors.(certain restrictions may apply).

Since Pecora architectural sealants are applied to varied substrates under diverse environmental conditions and construction situations it is recommended that substrate testing be conducted prior to application.

TABLE 1: TYPICAL UNCURED PROPERTIESat 77°F (25°C), 50% R.H.

Test Property Value Test Procedure

Flow, Sag, Slump (in.) <0.1 ASTM C639Tool/Work Time (minutes) 15-25 Pecora CorporationTack Free Time (hours) 1-2 ASTM C679Cure Time (days) 7-14 Pecora CorporationFull Adhesion (days) 7-14 Pecora CorporationVOC Content (g/l) 98 ASTM D3960

Test Property Value Test Procedure

Hardness (Shore A) 20 ASTM C661Elongation (%) 1000 ASTM D412Modulus @ 100% Elongation (psi) 30 ASTM D412Ultimate Tensile Strength (psi) 120 ASTM D412Tear Strength (ppi) 30 ASTM D624Peel Strength (pli) on aluminum, glass, and concrete 25 ASTM C794Dynamic Movement Capability (%) +100-50 ASTM C719Ozone/UV Resistance Excellent WeatherometerStaining of porous substrates such as white marble Pass ASTM C1248 Service Temperature Range (°F) -60 to +300 Pecora Corporation

TABLE 2: TYPICAL CURED PROPERTIESAfter 7 days cure at 77°F (25°C), 50% R.H.

Pecora 890NST is particularly well suitedfor use in Exterior Insulation FinishSystems (EIFS) because of its provenstrong adhesion to all base and top coatsand because its ultra-low modulus formu-lation places minimal stress on the bondline. Additionally, Pecora 890NST is avail-able in many of the more popular EIFScolors.

Limitations: Pecora 890NST should notbe used in the following applications:• Sealing horizontal decks, patios, drivewayor terrace joints where abrasion or physical abuse is encountered.

• Below grade or sealing submerged jointsor below the waterline in marine uses.

• In totally confined or air-free spaces since moisture is necessary for cure.

• In designs that will be painted after application of the sealant. Sealant shouldbe applied after painting is completed.

• In structural glazing applications.• On surfaces with special protective or decorative coatings without prior consultation with Technical Services.

• With building materials that bleed oils, plasticizers or solvents, i.e. impregnated wood, oil-based caulks, some vulcanized rubber gaskets or tapes, etc.

• In interior penetration firestop systems.• On surfaces in direct contact with food. For such applications, use of Pecora 860silicone with FDA approval is recommended.

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4. TECHNICAL DATAApplicable Standards: Pecora 890NSTSilicone meets or exceeds the requirementsof the following industry specifications; TT-S-230C, Class A, ASTM C-920, Class 100,Type S, Grade NS, Use G,A,M,O andCGSB-19GP-9, ASTM C-1248,CAN/CGSB-19.13-M87.

Joint Design:A thin bead of silicone willaccommodate more movement than athick bead. Pecora 890NST Silicone sealantshould be no thicker than 3/8" (9 mm) andno thinner than 1/8" (3 mm) for jointswhere excessive movement is expected.Ideally, the ratio of joint width to thesealant depth should be about 2:1 whenappropriate. The width of building expansion joints varies because of seasonaland daily changes in temperature. If Pecora890NST cannot be installed when thedesign width is approximately halfwaybetween the dimensional extremes, thedesigned joint must be at least twice thetotal anticipated joint movement. Good architectural practice calls for joint designof four times the anticipated movementdue to construction tolerances and material variations.

5. INSTALLATIONSurface Preparation: Clean all jointsand glazing areas by removal of foreignmatter and contaminants such as oil, dust,grease, frost, water, surface dirt, oldsealants or glazing compounds and anyprotective coating. Porous substrates andprecast concrete panels using form releaseagents other than polyethylene film shouldbe cleaned by grinding, saw cutting, blastcleaning (water or sand), mechanicalabrading or a combination of thesemethods which will provide a sound, cleanand dry surface for sealant application.Dust, loose particles, etc. should be blownout of joints with oil-free compressed airor vacuum cleaned. Metal, glass and plasticsurfaces should be cleaned by solventprocedure or by mechanical means. Soapor detergent and water cleaning treatments are not recommended.Cleaning of all surfaces should be done onthe same day on which the sealant isapplied.

CAUTION: Solvents may be toxic and/orflammable. Refer to solvent manufacturer’sinstructions or Safety Data Sheets (SDS).

Priming: Pecora 890NST does notrequire priming on most common sub-strates. However, Pecora strongly suggestsadhesion pretesting, either in the field or inPecora’s laboratory on all porous substrates, particularly brick, as well asunusual building materials and other substrates where special coatings or surface treatments may impair optimumadhesion. Where primer is indicated, P-150should be used on porous substrates andP-120 on special metal and plastic surfaces.All precast substrates require priming withP-225 primer. All EIFS substrates requirepriming with P-75 or P-150 primer.Contact Technical Services department forprimer use on other substrates.

To assist in this determination Pecora hasa list of adhesion-in-peel test results on awide variety of substrates and buildingmaterials which is available on requestfrom our Technical Services department.

Pecora routinely conducts project specificadhesion and compatibility tests in its laboratory on representative substratesamples. Consult Technical Services fordetails.

Joint Backing: Backer rod controls thedepth of the sealant and allows it to beapplied under pressure. Use a size that willcompress 25%. Denver Foam open-cellpolyurethane or reticulated (soft) polyeth-ylene rod is recommended. Closed-cellpolyethylene may be used but care mustbe taken not to puncture the rod whichcan cause outgassing or bubbling/blisteringin the sealant. Open-cell polyurethane isrequired with non-porous substrates toallow proper curing from both sides of thesealant. In joints too shallow for backerrod, use a polyethylene bond-breaker tapeto prevent three-sided adhesion.

Application:All joints should be maskedto ensure a neat appearance and preventsealant applied outside the joint confinesfrom imparting a discoloration to thesubstrate.

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Specification Data Sheet

Typical Applications forPecora 890NST Ultra-Low Modulus Silicone Sealant

EXPANSION JOINT

Pecora 890NST

MASONRY

EXPANSION JOINT

Pecora 890NST

Pecora 890NSTWeatherseal

EIFS

Backer Rod

Concrete

Backer Rod

Natural Stone

WINDOW FRAME

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P E O P L E • P R O D U C T S • P E R F O R M A N C E

165 Wambold Road, Harleysville, PA 19438Phone: 800-523-6688 • 215-723-6051 • FAX: 215-721-0286

www.pecora.com

Specification Data Sheet

Sealant should be applied in a continuousoperation using sufficient pressure to fillthe joint and make complete contact tothe joint sides. Tool the sealant slightlyconcave using solvent or dry-toolingtechniques. Contact Technical Servicesprior to tooling with solvent. Do not toolwith soap or detergent and water solutions.

Tool Time: (Initial Skin): 15-25 minutesat 77° F (25° C), 50% RH. Higher tempera-tures and/or humidity will shorten thistime.

Clean Up: Immediately remove all excesssealant and smears adjacent to joints withmineral spirits. For equipment cleanup, alsouse mineral spirits. Consult manufacturer’sSafety Data Sheet for handling and safetyprecautions.

Shelf Life: Pecora 890NST has a shelf lifeof twelve months from date of manufac-ture when stored at temperatures lowerthan 80° F (27° C).

Precautions: Use with adequate ventila-tion or wear an appropriate NIOSH-approved respirator. Contact withuncured sealant or with vapors generatedduring curing may cause respiratory tractirritation. Contact with skin or eyes maycause irritation or allergic reaction. Avoidcontact and wash thoroughly after han-dling. May be harmful if swallowed. Referto Safety Data Sheet (SDS) for more information.

FOR PROFESSIONAL USE ONLY.KEEP OUT OF THE REACH

OF CHILDREN.

6. AVAILABILITY AND COSTPecora products are available from stockingdistributors nationwide. For the name andtelephone number of your nearest repre-sentative, call the number below or visitour website at www.pecora.com.

7. WARRANTYPecora Corporation warrants its productsto be free of defects. Under this warranty,we will provide, at no charge, replacementmaterials for, or refund the purchase priceof, any product proven to be defectivewhen used in strict accordance with ourpublished recommendations and in applica-tions considered by us as suitable for thisproduct. The determination of eligibility forthis warranty, or the choice of remedy avail-able under this warranty, shall be made inour sole discretion and any decisions madeby Pecora Corporation shall be final. Thiswarranty is in lieu of any and all other war-ranties, expressed or implied, including butnot limited to a warranty of merchantabilityor fitness for a particular purpose and in nocase will Pecora be liable for damages otherthan those expressly stated in this warranty,including but not limited to incidental orconsequential damages.

8. MAINTENANCEIf the sealant is damaged and the bond isintact, cut out the damaged area andrecaulk. No primer is necessary. If thebond has been affected, remove thesealant, clean and prepare the joint inaccordance with the instructions under“INSTALLATION”.

9. TECHNICAL SERVICESPecora representatives are available toassist you in selecting an appropriate product and to provide on-site applicationinstructions or to conduct jobsite inspections. For further information andassistance, please call our TechnicalServices department at 215-723-6051 or800-523-6688.

10. FILING SYSTEMShttp://www.4specs.com

- 07 10 00 Waterproofing- 07 92 00 Sealants

PEC 11012/14

DON’T STAIN YOUR REPUTATION™ - Pecora NST Non-Staining Technology

SEALANT VALIDATION

Issued to: Pecora CorporationProduct: 890 NST Silicone Sealant

C719: Pass ____ Ext:+100% Comp:-50%

Substrate: Primed motar, primed anodized aluminum and unprimed glass substrates[motar substrate primed with Pecora P-801 Primer and anodized aluminum primed with Pecora P-120 ]

Validation Date: 10/16/14 – 10/15/19

No. 1014-8901019 Copyright © 2014

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