Product Details


Engineered to Protect

GSB-78® is ASI’s original product, with more than 40 years of proven performance on parking lots, city streets, county roads, and airfields. It is a long-lasting, predictable, and rapid-curing sealer, delivering exceptional results on a wide variety of pavement types.

By adding natural asphalts and plasticizers, GSB-78® by ASI renews the binder in a pavement’s top aggregate course. This restores the structure’s ability to withstand oxidation and deterioration from sunlight, rain and snow.


GSB-78® seals pavement from the elements. With regular applications, the life of your surfaces can be extended almost indefinitely.

Preserve Your Investment

For just pennies per square foot, GSB-78® can increase the life of your asphalt. As it cures, GSB-78® binds aggregate and prevents the pavement from drying out. This seals and enhances the natural oils and resins necessary for surface flexibility.

ASI: A Global Leader for 40 Years

Since 1969, our products have been used to maintain pavements all over the United States, Canada and Europe. GSB-78® is perfect for contractors as well as pavement managers, cutting both replacement and maintenance costs with one superior product.

imageEasy to use. Easy to store.

GSB-78® can be applied with standard distributor trucks or hand sprayers. Because it is not temperature sensitive, it has an almost indefinite storage life.

GSB-78® is the Asphalt Systems, Inc. brand of excellence. This product has been in production for over 40 years by ASI, and is by many accounts the best asphalt pavement preservation material ever offered. GSB-78® does not just attempt to cover and protect the pavement. When applied, it becomes an integral part of the pavement surface, leaving its benefits behind to offer years of protection from the elements. It is easy to apply, easy to handle, and easy to store. If GSB-78® is applied to a well-constructed pavement in the early stages of its life, it can maintain its service life, texture, and integrity almost indefinitely. Over the past 40 years, this product has been used to maintain pavements all over the United States, as well as Canada, and Europe. GSB-78® is an excellent choice for the contractor, as well as any pavement owner or manager.

GSB-78® Pavement Sealer and Rejuvenator

Product Description:

GSB-78® Pavement Sealer and Re-juvenator is a chemically engineered formulation of Gilsonite ore, specially selected plasticizers, and dilutents. GSB-78® has been specifically formulated for use on a wide variety of asphalt pavement surfaces. GSB-78® provides a durable Gilsonite sealer while special plasticizers and resins penetrate and rejuvenate asphalt pavements. The result is an asphalt pavement that has been sealed,locking in the rejuvenation that has occurred with the use of GSB-78®. GSB-78® dries to an absolute, brilliant black appearance.


GSB-78® Pavement Sealer and Rejuvenator is available in a ready to use form only. Shipment by 55 gallon drum, bulk tank truck, or bulk rail road tank cars may be arranged.

Specifications for GSB-78®:

Kinematic Viscosity at 60. C (140. F), cts. - - - - 21 0-30
Percent Water, Maximum. - - - - 0.5
Percent Residue by Distillation - - - - 30-45

Tests on Residue from Distillation:

Penetration at 25°C (77°F), dmm - - - - 2-12
Softening Point, of - - - - 180-200
HC1 Precipitation Value - - - - 18-25
Solubility in 1,1,1 Trichloroethylene, % - - - - 99 min.

Storage and Handling Instructions

Either vertical or horizontal storage tanks may be used for the storage of GSB-78®. Under normal circumstances, GSB-78® does not require heating for use. Optimum product temperatures for use are 65°F (18°C) to 100°F (38°C). If GSB-78® is to be heated prior to use, or while in storage, use steam coils, hot water coils, or hot oil coils with hot oil circulating at less than 200°F (93°C). Electrical heating elements may also be used, but must be moisture and explosion resistant. Never use open flame or closed flame firetube heaters with GSB-78®. GSB-78® should not be heated above 100°F (38°C). During any heating process, GSB-78® should be stirred using a circulation pump, or mechanically agitated to prevent localized overheating. Positive displacement gear pumps are recommended for pumping GSB-78®. GSB-78® contains flammable ingredients and must therefore be labelled, and during transport must carry a 1999 placard. Allow no smoking or open flames within 100 feet of storage tanks, transport trucks, and application equipment containing GSB-78®. Electrical equipment used near GSB-78® must be explosion resistant or explosion proof.

Application Instructions


GSB-78® may be applied with standard bituminous distributors and/or hand sprayed using standard tack pots. The equipment must be in good working order, and contain no contaminants or diluents in the tank prior to loading with GSB-78®. The application equipment must be capable of maintaining predetermined flow rates and constant pressure during application. No special mixing equipment is required (see sanding below) as GSB-78® is ready to apply and will not separate or stratify in transit or storage.

Rate of Spread:

Rate of spread, or application rate for GSB-78® may vary from 0.10 to 0.15 gallons per square yard, (60 square feet per gallon to 90 square feet per gallon). Exceeding recommended application rates should not be done without first contacting a manufacturer's representative or responsible and knowledgeable pavement maintenance civil engineer.

Addition of Sand:

Sanding should be done at the same time GSB-78® is applied. A hard, highly fractured sand should be used. Because there are regional differences in sand characteristics, a knowledgeable local pavement maintenance engineer should be consulted to insure that the appropriate amount and type of sand is chosen to regain any lost skid resistance. Sanding is best done by mounting a sand slinger on the applicator and applying approximately 0.25 to 1 .25 pounds of sand per square yard or more if necessary during the spreading process.

Cure Time:

Under normal conditions, cure time for GSB-78® is 1 to 4 hours. Sheltered or shady areas may require longer cure times.

Application Precautions:

GSB-78® should not be applied to wet or damp pavement surfaces. Do not apply during rainy or damp weather, or when rain is anticipated within 4 hours after application is completed. Pavement surface temperatures should be 55"F (13"C) and outside air temperatures should be 40"F (4"C) and rising to prevent the GSB78 from browning during cure. GSB-78® may be applied at night provided the pavement surface temperatures and outside air temperatures are at least 77"F (25"C). Consult the Material Safety Data Sheet for fire and explosion data, health hazard data, first aid procedures, reactivity data, spill or leak procedures, waste disposal and use of personal protective equipment. Additional copies of the Material Safety Data Sheet can be obtained by calling ASI, at 1-801-972-2757.

Preparation of Pavement Surfaces:

Repair and patch all major pavement defects. Scrape all oil spots to remove excess oil and dirt. Just before applying GSB-78® clean the asphalt surface of all loose dust, dirt, and other debris. All cracks, other than hairline cracks, should be filled with a suitable bituminous crackfiller. This may be done before, or after application of GSB-78®.

Addition of other materials:

GSB-78® has been chemically engineered to provide a restorative seal without the requirement of other materials or additives. Asphalt Systems, Inc. assumes no responsibility for problems arising from alteration of the original formula.

Clean up:

GSB-78® may be removed with degreasing solvents. GSB-78® should be removed from skin using hand cleaners and skin creams.

Availability and Cost:

For further information on availability and cost of GSB-78® contact Asphalt Systems, Inc., P.O. Box 25511, Salt Lake City, UT 84125-0511 or call 801-972-2757 or fax us at 801-972-6433.


Under normal wear and tear, a single application of GSB-78® properly applied, should not require reapplication for 3 to 5 years. Reapplications should be at the recommended rates. Regular preventative maintenance can extend the life of pavement indefinitely.

Warranty and Disclaimer:

Asphalt Systems, Inc. warrants GSB-78® with respect to the quality stated herein. However, since the use of the product is beyond our control, our liability for damages shall in no case exceed the purchase price from Asphalt Systems, Inc., for the quantity of material consumed.

All products shipped shall meet or exceed the applicable specifications. Asphalt Systems, Inc., shall not be responsible for material after it has been stored in customer's tanks or for contamination from unclean trucks and shipping containers. Asphalt Systems, Inc., will assume no responsibility or liability for improper applications, skid resistance changes, thickening in storage, or any other conditions beyond our control.

This section sets forth the exclusive remedy for claims based on defects in or nonconformity of the product whether the claim is in contract, warranty, tort (including negligence) or otherwise. THE FOREGOING WARRANTIES ARE IN LIEU OF ALL OTHER WARRANTIES, WHETHER ORAL, WRITTEN, EXPRESS, IMPLIED OR STATUTORY, NO IMPLIED OR STATUTORY WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL APPLY.

ASI shall not be liable for any special consequential, incidental, indirect or auxiliary . damages, including, without limitation, loss of profits or revenues, loss of use of products or any associated equipment, cost of capital, cost of substitute goods, facilities, services, downtime costs or claims of the purchasers customers for such damage. ASI's sole liability, and any liability of ASl's suppliers, arising from the manufacture, sale, resale, use or application of the product shall not exceed the purchase price from ASI for the quantity of the product consumed.


Trade Name: Asphalt Cutback, GSB 78, Gilsonite

GSB-78® is a liquid or cut-back, rapid cure, (RC-10h), Bituminous product containing Gilsonite resin, petroleum asphalt and petroleum kerosene/Naphtha. Appearance: Black liquid with petroleum solvent odor. Distributed By: Asphalt Systems, Inc. P.O. Box 25511, 2775 w 1500 s, Salt Lake City, UT 84125 Technical Contact: (801) 972-2757

ANSI Caution! May cause skin and Eye Irritation.


Hazard Codes : Health 
Fire 3
Reactivity 0

Classification System: NFPA/HMIS Definitions: 0-Least, 1-Slight, 2-Moderate, 3-High, and 4-Extreme

Signal Word: Flammable.

ANSI Caution! May cause skin and Eye Irritation.

Major Route(s) of Entry: Inhalation, Skin, Eyes, Ingestion.

Signs and Symptoms of Acute Exposure

Eye Contact: This material can cause eye irritation with tearing, redness, or a stinging or burning feeling. Effects may become more serious with repeated or prolonged contact.

Skin Contact: Contact with skin may result in dermatitis. May cause skin irritation with redness, an itching or burning feeling, and swelling of the skin. Effects may become more serious with repeated or prolonged contact. Skin contact may cause harmful effects in other parts of the body.

Inhalation: Fumes from petroleum Naphtha / Kerosene are capable of production varying degrees of nervous system depression if overexposure occurs. These effects are similar to alcohol intoxication and range from drowsiness, nausea, dizziness, mental confusion, reduced attention span, loss of coordination, numbness in the extremities and unconsciousness. These symptoms are reversible when exposure is terminated. Petroleum asphalt forms fumes when heated. These fumes may cause irritation to the nose, throat and respiratory tract.

Ingestion: If swallowed, if victim is conscious, give liquids. Induce vomiting, Call Medical Professionals immediately.

Medical Conditions aggravated by exposure: Disorders of the following organs or organ systems that may be aggravated by significant exposure to this material or its components include: Skin, eyes

Other Health Warnings: Health studies shown that many petroleum hydrocarbons and synthetic lubricants pose potential human risks which may vary from person to person. As a precaution, exposure to liquids vapors, mists or fumes should be minimized

Kerosene/ Naptha 64742-48-9 N/E 500 ppm
Additives N/A N/E N/E


COMP Name (s) CAS Registry # CONC(%) TLV PEL
Mineral 012002-43-6 /310-127-6 5mg/m3 N/E
Petroleum Asphalt 8052-42-4 Information 5mg/m3 N/E
Kerosene/ Naphtha 64742-48-9 N/E 500 ppm
Additives /anti- strip N/A Less than 1% N/E N/E


Take proper precautions to ensure your own health and safety before attempting rescue or providing first aid.

Eye Contact: If product enters eyes, check for and remove contact lenses. Flush eyes with cool, clean, low-pressure water while occasionally lifting and lowering eyelids. Seek medical attention if excessive tearing, redness or pain persists.

Skin Contact: For contact with product, remove contaminated shoes and clothing. Wipe off excess material. Wash exposed skin with soap and water. Thoroughly clean contaminated clothing before reuses. Discard contaminated leather goods.

Inhalation: Move victim to fresh air. If victim is not breathing, immediately begin rescue breathing. If breathing is difficult, 100 percent humidified oxygen should be administered by a qualified individual. Seek medical attention immediately. Keep the affected individual warm and at rest.

Ingestion: If victim is conscious, Do not Induce Vomiting. Never give anything by mouth to a person who is not fully conscious. Call a Physician.

Note to physicians: Treat symptomatically. / No data Available.


NFPA Flammability classification: NFPA Class IIIB combustible material.
Flash Point <70oF
Lower Flammable Limit   N/A
Upper Flammable Limit N/A 
Auto-ignition Temperature N/A 

Special Fire Fighting Procedures: Do not enter any enclosed or confined space without proper protection equipment. This may include SCBA. Cool tanks and containers exposed to fire with water. Improper use of water and extinguishing media containing water may cause frothing which can spread the fire over a larger area.

Extinguishing Media: Use dry chemical and carbon dioxide. Foam and water are effective, but may cause frothing. Fire fighting should be attempted only by those who are adequately trained and equipped with proper protective equipment.

Special Properties: Unusual Fire Fighting Procedures: The flash point displayed above refers to only the petroleum components of this product. When heated above its flash point or when held in storage at elevated temperatures, this material can release flammable vapors which can burn in the open or be explosive in confined spaces if exposed to an ignition source. Studies have shown that relatively low flash point substances, such as hydrogen sulfide and low-boiling hydrocarbons, may accumulate in the vapor space of hot asphalt tanks and bulk transport compartments. As a precaution, keep ignition sources away from vents and openings

Hazardous combustion products: Carbon dioxide, carbon monoxide, smoke, fumes, unburned hydrocarbons and oxides of sulfur and /or nitrogen. Hydrogen sulfide and other sulfur-containing gases can evolve from this product particularly at elevated temperatures.

Special Properties: This product will burn when exposed to any ignition source. Care should be taken to never introduce an open flame or other source of ignition to any product while being stored.


Take proper precautions to ensure your own health and safety before attempting spill control or clean-up. For more specific information refer to the emergency Overview on page 1, Exposure Controls/Personal Protections in Section 8 and Disposal Considerations in Section 13 of this MSDS.

Do not touch damaged containers or spilled material unless wearing appropriate protective equipment. Slipping hazard – do not walk through spilled material. Stop leak if you can without risk. For small spills, absorb or cover with dry earth, sand, or other non-combustible absorbent material and place into waste containers for later disposal. Contain large spills to maximize product recovery or disposal. Prevent entry into waterways or sewers. In urban area, cleanup spills as soon as possible. In natural environment, seek cleanup advice from specialists to maintain habitat and minimize damage.


Handling: Avoid contamination and extreme temperatures to minimize product degradation. Empty containers may contain product residues that can ignite with explosive force. Do not pressurize, cut, weld, braze solder, drill, grind, or expose containers to flames, sparks, heat or other potential ignition sources. Consult appropriate federal, state, and local authorities before reusing, reconditioning, reclaiming, recycling or disposing of empty containers and/or waste residues of this product.

Storage: For ease of handling, store product between 70 and 110oF.


Engineering controls: Provide exhaust ventilation or other engineering controls to keep the airborne concentrations of mists and/or vapors below the recommended exposure limits. An eye wash station and safety shower should be located near the work-station.

Personal Protective Equipment (PPE): Personal protective equipment (PPE’s) should be selected based upon the conditions under which this material is used. A hazard assessment of the work area for PPE requirements should be conducted by a qualified professional pursuant to OSHA regulations. The minimum requirements for PPE are:

  • Protective eyewear
  • Protective gloves
  • Protective clothing

For certain operations, additional PPE may be required.

Eye Protection: Use a full face shield and chemical safety goggles is handling heated material. With product at ambient temperatures, safety glasses equipped with side shields are recommended as a minimum protection in industrial settings. Keep a suitable eye wash station immediately available to work area.

Hand Protection: When handling product at elevated temperatures, use long cuffed leather or heat-resistant gloves. When product is at ambient temperatures, use gloves constructed of chemical resistant materials such as heavy nit rile rubber if frequent or prolonged contact is expected.

Ventilation: Use local exhaust to capture fumes when handling hot product in confined spaces.

Body Protection: Prevent skin contact when handling heated material. Use insulated, heat-resistant clothing such as a chemical resistant apron or slicker suit. Use a full-body heat-resistant or internally cooled suit when work conditions dictate.

Respiratory: With adequate ventilation, no respirator is needed. If exposure exceeds the occupational control limits, wear a NIOSH-approved, air-purifying, particulate filter respirator suitable for dusts, fumes and mists. Respirators should be used in accordance with OSHA requirements (29 CFR 1910.134).

General Comments: Use good personal hygiene practices. Wash hands and other exposed skin areas with plenty of mild soap and water before eating, drinking, smoking, use of toilet facilities, or leaving work. Do Not use gasoline, kerosene, solvents or harsh abrasive skin cleaners.


The data below are typical values and do not constitute a specification.

Appearance: Black color: semi-solid when cold, viscous fluid when hot 
Flash Point: >70oF
Evaporation Rate: 1.6
Vapor Density (air = 1): 0.995
Specific Gravity: 0.8625
Solubility: Insoluble
Density: 6.9 lbs/gallon
Odor: Asphalt Hydrocarbon odor
Percent Volatile by Volume: 59- 62%


Chemical Stability: Stable. DO NOT heat this material.

Incompatibility with other materials: Avoid contact with strong oxidants such as liquid chlorine, concentrated oxygen, sodium hypochlorite, or calcium hypochlorite. Hot product in contact with water can cause foaming or sudden evolution of steam, which could cause pressure build-up and possibly rupture a tank or vessel.

Hazardous Decomposition Products: Carbon Monoxide, Aldehydes, aromatic Hydrocarbons.

Hazardous Polymerization: Hazard polymerization will not occur.

Conditions to avoid: Keep away from Ignition source, extreme heat, strong acids, and strong oxidizing conditions.


Toxicity Data: Asphalt
  • ORAL (LD50): Acute>5000 mg/kg [Rat]
  • Dermal (LD50): Acute: .2000 mg/kg [Rabbit]

Asphalt fumes have been associated with eye, skin and respiratory tract irritation. Repeated or prolonged contact with asphalt at ambient temperatures can result in skin irritation. Long-term exposure can cause dermatitis, acne, photosensitization and more rarely, pigmentation of the skin. The international agency for Research on Cancer (IARC) has determined that there is sufficient evidence for the carcinogenicity of extracts of steam-refined bitumen’s in experimental animals. Further IARC has determined that there is limited evidence for the carcinogenicity of undiluted steam-refined bitumen’s in experimental animals. Also, IARC determined that there is inadequate evidence that bitumen alone are carcinogenic to humans.

  • Naptha – 400.00 ppm 8hr TWA OSHA*

* the manufacture has voluntarily elected to reflect exposure limits contained in OSHA’S 1989 air contaminants standard in its MSDS’s Even though certain of those exposure limits were vacated in 1992.

Some components of Naphtha’s, I.E. Paraffin’s and olefins, have been shown to product a species specific, sex hormonal dependent kidney lesion in male rats from repeated oral or inhalation exposure. Subsequent research has shown that the kidney damage develops via the formation of alpha-2u-globulin, a mechanism unique to the male rat. Humans do not form alpha-2u-globuin, there fore the kidney effects resulting from this mechanism are not relevant in humans.


Eco-toxicity: Spilling of petroleum products can result in environmental damage. Petroleum products of this nature floats on water and evaporates rapidly from water and soil surfaces. However, Spilled petroleum based Asphalt Cutback products may penetrate soil and could contaminate groundwater.

Asphalt cutback materials are biodegradable but in situations of low oxygen, such as in soil below grade or in groundwater may persist for many years.

Naphtha does not readily dissolve in water but will be adsorbed to soils. Naphtha in the environment can be toxic to plants and animals.

As it mixes with water, water insoluble hydrocarbon in this material will separate and float on the water layer. Analysis for ecological effects has not been conducted on this product. However, if spilled, this product and any contaminated soil or water may be harmful to human, animal, and aquatic life. Also, the coating action associated with petroleum and petroleum products can be harmful or fatal to aquatic life and waterfowl.

Environmental Fate: This product is estimated to have a slow rate of biodegradation. This product is not expected to bioaccumulation through food chains in the environment.



Maximize material recovery for reuse or recycling. Conditions of use may cause this material to become a hazardous waste, as defined by federal or state regulations. It is the responsibility of the user to determine if the material is a hazardous waste at the time of disposal. Transportation, treatment, storage, and disposal of waste material must be conducted in accordance with RCRA regulations (see 40 CFR 260 through 40 CFR 271). State and/or local regulations may be more restrictive. Contact your regional US EPA office for guidance concerning case specific disposal issues.


The shipping description below may not represent requirements for all modes of transportation, shipping methods or locations outside the United States.

DOT Shipping Name: Tars, Liquid / Cutback
DOT Hazard Class: 3
DOT Identification Number: UN1999
Placard: UN1999
DOT Packing Group: Group II


TSCA Inventory: All of the components of this material are on the toxic Substance Control ACT (TSCA) Chemical Inventory

SARA 302/304 Emergency Planning and Notification: The Superfund Amendments and Reauthorization act of 1986 (SARA) Title III requires facilities subject to subpart 302 and 304 to submit emergency planning and notification information based on Threshold Planning Quantities (TPQs) for “Extremely Hazardous Substances” Listed in 40 CFR 302.4 and 40 CFR 355.

SARA 311/312 Hazard Identification: The Superfund Amendments and Reauthorization act of 1986 (SARA) Title III requires facilities subject to this subpart to submit aggregate information on chemicals by “Hazard Category” as defined in 40 CFR 370.2. This material would be classified under the following hazard categories:

  • ACUTE (Immediate) Health Hazard, Chronic (delayed) Health hazard

CERCLA: The Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) requires notification of the National Response Center concerning release of quantities of “hazardous substances” equal to or greater than the reportable quantities (RQ’s) listed in 40 CFR 302.4. As defined by CERCLA, the term “hazardous substance” does not include petroleum, including crude oil or any fraction thereof which is not otherwise specifically designated in 40 CFR 302.4. This product or refinery stream Is known to contain chemical substances subject to this statue. However,, it is recommended that you contact state and local authorities to determine if there are any other reporting requirements in the event of a spill.


Scale for NFPA and HMIS Ratings:
  • 0-least
  • 1-Slight
  • 2-Moderate
  • 3-High
  • 4-Extreme

PPE- Personal Protective Equipment Index Recommendation, *-Chronic Effect Indicator.

These values are obtained using the guidelines or published evaluations prepared by the National Fire Protections Association (NFPA) or the National Paint and Coatings Association (for HMIS ratings).

Abbreviations Used in this Document:
  • TLV – Threshold Limit Value
  • TWA – Time Weighted Average
  • STEL – Short-term Exposure Limit
  • REL/PEL – Recommended/ Permissible Exposure Limit
  • NA – Not Applicable
  • CAS – Chemical Abstract Service Number
  • NDA - No Data Available
  • NE – Not Established

The information in this MSDS was obtained from sources which we believe are reliable. However, the information is provided without any warranty, expressed or implied regarding its correctness. Some information presented and conclusions drawn herein are from sources other than direct test data on the substance itself. This MSDS was prepared and is to be used only for the products listed. If the product is used as a component in another product, this MSDS information may not be applicable. Users should make their own investigations to determine the suitability of the information or products for their particular purpose.

The conditions or methods of handling, storage, use and disposal or the product are beyond our control and may be beyond our knowledge. For this and other reasons, we do not assume responsibility and expressly disclaim liability for loss, damage, or expense arising out of or in any way connected with handling, storage, use, or disposal of the product.