A Guide ToFabricating Composites With HETRON > TM andAROPOL > Now With FCAT Data! Resins > Ashland Specialty Chemical Company is the leading supplier of resins for corrosion resistant and flame retardant composites Next size="-3">

Previous |Contents |Next > Product Description Fabrication Methods Fabrication Standards . . . . . . . . . . . . . . . . . . . .24 Hand Lay-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 Spray-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27 Filament Winding . . . . . . . . . . . . . . . . . . . . . . .28 Pultrusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28 Centrifugal Casting . . . . . . . . . . . . . . . . . . . . . .29 Resin Transfer Molding . . . . . . . . . . . . . . . . . . .29 Linings . . . . . . . . . . . . . . . . . . . . . . ....

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Previous |Contents |Next 1 There are two primary types of catalysts recommended for curing HETRON andAROPOL resins at room temperature:methyl ethyl ketone peroxide (MEKP) and benzoyl peroxide (BPO).A third,less common,catalyst type is cumene hydroperoxide (CHP) which is often recommended for blending with MEKP.In other processes,such as pultru- sion,different types of catalysts are used.Catalysts for the pultrusion process are heat activated and are not used with promoters.The proper choice of a catalyst is critical to achieving expected chemical resistance.Caremust be taken not to select catalysts...

T-butyl Peroxybenzoate TBPB is a secondary catalyst that can be used in addition to MEKP,BPO,or CHP.The addition of TBPB assists in achieving a higher degree of cure.We recommend TBPB at 0.2%,based on resin.The addition of TBPB to resin will shorten the pot life.Please consult Ashland Technical Service for more information on TBPB. > Previous |Contents |Next form and the crystals in 98% active form.To achieve the same gel time with paste andcrystals,half the amount of crystals should be used as paste.For example,2.0 grams of paste will react to give the same gel time as 1.0 gram of the crystals.BPO...

Copper Naphthenate Copper naphthenate is available as a green paste that typically contains 6 - 8% elemen- tal copper.It is included in a formulation to control the exotherm of blends intended for MEKP catalyzation.If low hydrogen peroxide containing MEKPs are used,the impact on the peak exotherm is marginal.However,if standard MEKPs are used,copper naphthen- ate will lower the exotherm and lengthen the time from gel to peak,without effecting the gel time.Typical levels of copper recommended for exotherm control are 0 400 ppm.Copper naphthenate should be added to the formulation the same day...

Previous |Contents |Next TBC,HQ,and THQ can be used with MEKP,BPO,and CHP catalyst systems.However,careshould be taken not to add too much inhibitor,which could result in permanent under- cure,low Barcol,or reduced corrosion resistance.Recommended inhibitor levels vary from inhibitor to inhibitor and from resin to resin.A general guide for addition levels is up to 0.30% of a 10% solution,however,Ashland Technical Service should be contacted for instructions on adding inhibitors to specific resin systems.Special attention to additives is necessary when fabricating for FDA applications.Title 21CFR...

Previous |Contents |Next SECTION 3 > HETRON FR 9923% Sb HETRON FR 9923% NYACOLHETRON FR 992 2 O 3 Laminates containing antimony trioxide,antimony pentoxide,and no antimony oxide.. > 10 Previous |Contents |Next >

Air Release Agents Wax Topcoats Air release agents can be added to the resin (0.05-0.5%) to decrease foaming.Excessive levels of air release agents can cause a laminate to be cloudy,therefore recommended levels should not be exceeded.Contact Ashland Technical Service for additional information. Some resins are subject to surface inhibition when cured in the presence of air.Air inhibition affects the cure and corrosion resistance of the outermost resin layer,which results in an acetone sensitive,potentially tacky surface.A wax-containing topcoat approximately 2.0-3.5 mil (51-89 m) thick applied...

Previous |Contents |Next The wax/styrene solution is made by dissolving 20 g of a fully refined paraffin wax(melting point = 130-140F (54-60аC)) in 180 g of warm styrene (110F (43аC)).The solu- tion is then added at the rate of 2% to the resin and mixed thoroughly.The resin solu- tion should then be promoted and catalyzed as normal.Predissolved wax solutions are also available from FRP distributors. Abrasion Resistant Additives An abrasion resistant corrosion liner is necessary when operating conditions involve slurries or other applications with abrasive particles that can abrade the corrosion...

Previous |Contents |Next structural portion of the laminate can also be filament wound where this layer typicallyhas a minimum of 60% glass.The thickness of this layer will vary depending on the equipment being fabricated.A final wax topcoat or gelcoat is then applied to the exteri- or of the equipment to prevent air inhibition. Types of Reinforcements The following discussion provides general guidelines for fiberglass selection,however, the glass manufacturer should be contacted for specific recommendations.Regardless of glass type,each should be thoroughly evaluated in a test laminate before...

Chopped Strand Mat Two primary types of chopped strand mat are used in the corrosion industry,EӔand ECRӔglass.Chopped strand fibers are generally > Previous |Contents |Next CӔ-glass veil is typically recommended for most corrosion environments.However,synthetic veil is preferred in some environments such as those con- taining fluoride compounds.Synthetic veil is pre- ferred in other environments,which are noted in the resin selection guide.When using synthetic veil with less flexible resins such as chlorendic polyesters,a non-apertured synthetic veil type is recommended to minimize stress in...

Continuous Strand Roving > Previous |Contents |Next Most continuous strand roving comes as unwoven strands of glass wound into a cylindrical package for additional processing.Continuous strand roving is used in filament winding and pul- trusion or can be chopped into fibers for spray-up applications to replace chopped strand mat. Woven Roving Woven roving consists of continuous glass fiber rovings that are woven together to form a heavy mat which is available in a variety of thicknesses and weights.Alternating layers of woven roving and chopped strand mat are used in the structural portion of...