BIO-GARD™ 257 is based on a unique blend of liquid epoxy polymer and aliphatic polyamine curing agents with an inert plasticizer, which is able to displace water from wet surfaces in order to make a permanent bond. The formulation is solvent-free to en- sure safety and maximum technical performance. Kevlar™* fibers are incorporated for reinforcement and viscosity management to achieve high application rates.
BIO-GARD™ 257 provides permanent protection under the most aggressive marine and industrial conditions. The formula is uniquely field-friendly and uses advanced low toxicity ingredients. All colors including White are available and can be shipped “Non-Regulated” by USDOT, IATA and IMO.
*Kevlar is a trademark of the E.I. DuPont de Nemours Co
Marine and Industrial “heavy duty” applications, wet or dry.
Reinforcing, smoothing and protecting worn concrete damaged by exposure to chemical or municipal waste streams.
VEHICLE TYPE : Epoxy/Aliphatic amines with inert plasticizer
PIGMENTATION : Color/Inert/fibrous reinforcement
COLORS : Standard White, Black, Gray – other available
FINISH : Slight texture
THINNER : Not normally required
CLEANER : MEK or lacquer thinner
MIXING RATIO : 2.00/1.00 v/v
INDUCTION TIME : Not required
POT LIFE : Approx. 40’ / 77°F
FLASH POINT : Over 200°F
SOLIDS BY VOLUME : 100%
RED. FILM THICKNESS : 15-30mils, (107 – 53 sq. ft./gallon)
SPREADING RATE/GAL : 1604 mil/sq. ft./gal, 80 sq. ft./gal @ 20 mils
DRY TIME, (Dust free) : 5 hours at 77°F
DRY TIME, (Service) : 14 hrs. light, 72 hrs. heavy
APPLICATION METHOD : Brush, Roller heated plural airless spray
STORAGE CONDITIONS : Normal, Freezing OK
VOC : Essentially zero
This may be accomplished in several different ways:
New Concrete surfaces are best prepared by abrasive blasting to roughen and remove the weak surface laitance. When prepared properly the surface should have the firm granular appearance of “medium” sandpaper.
Aged Concrete surfaces may be prepared by either high pressure water jetting at sufficient pressure to remove all loose contamination and yielding a firm, “medium” sandpaper finish. Worn concrete in wastewater service may be prepared using only about 3,500psi however aged concrete which has never been in aggressive service may require jetting with over 8,000 psi to achieve the same result. Air abrasive blasting is also a satisfactory method of preparation. If the concrete is extremely worn it may be faired smooth before application of the BIO-GARD™ 257 using BIO-FILL™ 455 or BIO-FILL™ 456 depending on anticipated exposure – call TFT for recommendations.
Steel is best prepared by air abrasive blasting to a “near-white”, (SA2.5, SSPC-SP-I0) BIO-GARD 257 is, however, extremely tolerant of compromised surfaces and will provide excellent protection over tight rust or existing coating residues in sound condition. The solvent-free formulation avoids softening of underlying coatings; BIO-GARD™ 257 may even be applied over Styrofoam™ without softening it.
BIO-GARD™ 257 is supplied in 2-gallon kits of base and curing agent. The base component is packed in a part filled two-gallon plastic pail and the curing agent is packed in a part filled one gallon steel can. Use a ½” “Jiffy” type mixer to initially stir the base then pour in the curing agent and continue mixing for about one extra minute taking care to incorporate all material from the base and sides of the pail. If unmixed epoxy base or curing agent is applied to the surface it will never cure.
Pour the mixed product into a pan and apply with a roller using typically a 3/8″ nap for both steel and concrete. Especially rough surfaces will apply more easily using a ½” nap.
When making application by brush use an appropriate sized brush with preferably natural bristles. In some applications it will be useful to either cut an inch or two of bristles from the end or to wrap the base of the bristles close to the shank with duct tape in order to stiffen the brush.
If airless plural spraying the following conditions are recommended:
Ratio: Base/Cure :: 2.00/1.00 (volume)
Fluid temperature: 130’F
Fluid pressure: 2,250 psi
Tip: 30thou” – angle to suit application
Cleaning solvent: MEK or standard epoxy thinner
CURING BEFORE SERVICE:
BIO-GARD™ 257 may be immersed in fresh or salt water immediately after application. It will cure to a hard film within about 14 hours and is suitable for traffic after this time. Allow at least three (3) days curing at 77°F before subjecting to severe service.
WE URGE YOU TO READ THE MATERIAL SAFETY DATA SHEET (MSDS) BEFORE USING AND TO CALL THIN FILM TECHNOLOGY, INC., AS NECESSARY FOR ADVICE OR INFORMATION BEFORE ANY ACTUAL OR CONTEMPLATED APPLICATION.
SAFETY: This is a hazardous material if misused. Read and understand the Material Safety Data Sheet (MSDS) before use.
WARRANTY DISCLAIMER: The technical data given herein has been compiled for your help and guidance and is based upon our experience and knowledge. However, as we have no control over the use to which this information is put, no warranty, express or implied, is intended or given. We assume no responsibility whatsoever for coverage, performance or damages, including injuries resulting from use of this information or of products recommended herein.