Elastomer Series (Component A)                                            Page 1 of 9

MSDS 12/98



****************************MATERIAL SAFETY DATA SHEET****************************



                          Manufacturer's Name: PRECISION CONVERTING

                            Street Address: 6650 CONCORD PARK DR

                               City, State, Zip: HOUSTON, TX 77040

                            Phone: (713) 934-1650 Fax (713) 934-1655

                           Emergency Response Phone: 1-800-424-9300



************************SECTION I ?PRODUCT IDENTIFICATION***********************



CHEMICAL FAMILY: Methylene diphenyl diisocyanate (M.D.I.)

TRADE NAME AND SYNONYMS: PC 00, 10, 20, 30, 40, 50, 55, 65, 70, 85 F, 360,

FORMULA: The specific chemical formula for this material is a Trade Secret of PRECISION

 CONVERTING

CHEMICAL NAME: Isocyanic Acid, Polymethylenepolyphenylene Ester

SYNONYMS: Polymeric Diphenylmethane Diisocyanate (MDI)

CAS NUMBER: 9016-87-9

FORMULA: Not Applicable



*************SECTION II ?COMPOSITION/INFORMATION INGREDIENTS*************



                                  HAZARDOUS INGREDIENTS



INGREDIENT NAME

  CAS NUMBER                             EXPOSURE LIMITS                     CONCENTRATION



4,4'-Diphenylmethane

 Diisocyanate (MDI)

   CAS # 101-68-8                     OSHA: .02 ppm Ceiling                  Upper Bound 22.5%

                                             .20 mg/m3 Ceiling

                                      ACGIH: .005 ppm TWA

                                             .951 mg/m3 TWA



Higher Oligomers of MDI

 CAS # 9016-87-9                      OSHA: Not established                             22.5%

                                      ACGIH: Not established



Diphenylmethane

 Diisocyanate (MDI)

   CAS # 26447-40-5                   OSHA: Not established                              5%

                                      ACGIH: Not established



Toluene Diisocyanate (TDI)            OSHA: PEL 0.02 ppm Ceiling                Less than 1%

  CAS #26471-62-5                     ACGIH: .005 ppm TWA



**********************SECTION III ?HAZARDS IDENTIFICATION*************************



EMERGENCY OVERVIEW:



  ?  WARNING! May cause eye, skin, and respiratory tract irritation. Harmful if inhaled; may

      cause allergic respiratory reaction, may cause allergic skin reaction, and may cause lung

      damage. Toxic gases/fumes are given off during burning or thermal decomposition.

Elastomer Series (Component A)                                            Page 2 of 9

MSDS 12/98



(continued)



POTENTIAL HEALTH EFFECTS:

 ROUTES OF ENTRY:

   SKIN: Contact from liquid and aerosols (spray application)

   INHALATION: Although MDI is low in volatility, an inhalation hazard can exist from MDI

      aerosols or vapors formed during heating, foaming or spraying. Individuals that are

      sensitized to TDI exposure may result in allergic respiratory reactions.

HUMAN EFFECTS AND SYMPTOMS OF OVEREXPOSURE:

 ACUTE INHALATION: MDI/TDI vapors or mist at concentrations above the TLV can irritate

   (burning sensation) the mucous membranes in the respiratory tract (nose, throat, and lungs)

   causing runny nose, sore throat, coughing, chest discomfort, shortness of breath and

   reduced lung function (breathing obstruction). Persons with a preexisting, nonspecific

   bronchial hyperactivity can respond to concentrations below the TLV with similar symptoms

   as well as asthma attack. Exposure well above the TLV may lead to bronchitis, bronchial

   spasm and pulmonary edema (fluid in lungs). These effects are usually reversible. Chemical

   or hypersensitive pneumonitis, with flu-like symptoms (e.g., fever, and chills) has also been

   reported. These symptoms can be delayed up to several hours after exposure.

 CHRONIC INHALATION: As a result of previous repeated overexposures or a single large

   dose, certain individuals develop isocyanate at levels well below the TLV. These symptoms,

   which can include chest tightness, wheezing, cough, shortness of breath or asthma attack,

   could be immediate or delayed (up to several hours after exposure), similar to many non-

   specific asthmatic responses. There are reports that once sensitized an individual can

   experience these symptoms upon exposure to dust, cold air or other irritants. This increased

   lung sensitivity can persist for weeks and in severe cases for several years. Overexposure to

   isocyanates has also been reported to cause lung damage, (including decrease in lung

   function) which may be permanent. Sensitization can either be temporary or permanent.

 ACUTE SKIN CONTACT: Isocyanates react with skin protein and moisture and can cause

   irritation, which may include the following symptoms; reddening, swelling, rash, scaling or

   blistering. Cured material is difficult to remove.

 CHRONIC SKIN CONTACT: Prolonged contact can cause reddening, swelling, rash, scaling,

   blistering, and in some cases, skin sensitization. Individuals who have skin sensitization can

   develop these symptoms from contact with liquid vapors. Animal tests have indicated that

   respiratory sensitization can result from skin contact with MDI. This data reinforces the need

   to prevent skin contact with MDI (see Toxicological Information, SENSITIZATION).

 ACUTE EYE CONTACT: Liquid, aerosols or vapors are irritating and can cause tearing,

   reddening and swelling. If left untreated, corneal damage can occur and injury is slow to

   heal. However, damage is usually reversible (see First Aid Measures for treatment).

 ACUTE INGESTION: Can result in irritation and corrosive action in the mouth, stomach tissue

   and digestive tract. Symptoms can include sore throat, abdominal pain, nausea, vomiting

   and diarrhea.

 CARCINOENICITY: Neither MDI nor polymeric MDI are listed by the NTP, IARC or regulated

   by OSHA as carcinogens.

      NTP: Not listed

      IARC: Not listed

      OSHA: Not regulated

MEDICAL CONDITIONS AGGRAVATED BY EXPOSURE: Asthma, other respiratory disorders

 (bronchitis, emphysema, bronchial hyperactivity), skin allergies, eczema.

 CARCINOENICITY : TDI is listed as a carcinogen by IARC (2B) and NTP. TDI has been shown

 to cause cancer in lab animals when administered orally. Carcinogenicity through inhalation

 (most likely route of industrial exposure) has not been proven.

MEDICAL CONDITIONS AGGRAVATED BY EXPOSURE: Asthma, other repiratory disorders

 (Bronchitis, emphysema, bronchial hyperactivity), skin allergies, eczema.

Elastomer Series (Component A)                                             Page 3 of 9

MSDS 12/98



***************************SECTION IV ?FIRST AID MEASURES*************************



FIRST AID FOR EYES: Flush with copious amounts of water, preferably, lukewarm water for at

  least 15 minutes, holding eyelids open all the time. Refer individual to physician or

  ophthalmologist for immediate follow-up.

FIRST AID FOR SKIN: Remove contaminated clothing. Wash affected skin thoroughly with soap

  and water. Wash contaminated clothing thoroughly before reuse. For severe exposure, get

  under safety shower after removing clothing, then get medical attention. For lesser exposures,

  seek medical attention if irritation develops or persists after the area is washed.

FIRST AID FOR INHALATION: Move to an area free from risk of further exposure. Administer

  oxygen or artificial respiration if needed. Obtain medical attention. Asthmatic-type symptoms

  may develop and may be immediate or delayed up to several hours. Consult physician should

  this occur.

FIRST AID FOR INGESTION: DO NOT induce vomiting. Give 1 to 2 cups of milk or water to

  drink. DO NOT GIVE ANYTHING BY MOUTH TO AN UNCONSCIOUS PERSON. Consult

  physician.

NOTE TO PHYSICIAN:

  EYES: Stain for evidence of corneal injury. If cornea is burned, instaill antibiotic steroid

    preparation frequently. Work place vapors have produced reversible corneal epithelial

    edema impairing vision.

  SKIN: This compound is a known skin sensitizer. Treat symptomatically as for contact

    dermatitis or thermal burns. If burned, treat as thermal burn.

  INGESTION: Treat symptomatically. There is no specific antidote. Inducing vomiting is

    contraindicated because of the irritating nature of this compound.

  RESPIRATORY: This compound is a known pulmonary sensitizer. Treatment is essentially

    symptomatic. An individual having a skin or pulmonary sensitization reaction to this material

    should be removed from exposure to any isocyanate.



**********************SECTION V ?FIRE FIGHTING MEASURES************************



FLASH POINT: 390.0 F (198.8 C) Pensky-Martens Closed

EXTINGUISHING MEDIA: Dry chemical, carbon dioxide, foam, and water spray for large fires.

SPECIAL FIRE FIGHTING PROCEDURES: Full emergency equipment with self contained

  breathing apparatus and full protective clothing should be worn by firefighters. During a fire,

  MDI vapors and other irritating, highly toxic gases may be generated by thermal decomposition

  or combustion (see Reactivity and Stability Section). At temperatures greater than 400 F

  (204 C) polymeric MDI can polymerize and decompose which can cause pressure build up in

  closed containers. Explosive rupture is possible. Therefore, use cold water to cool

  fire-exposed containers.



******************SECTION VI ?ACCIDENTAL RELEASE MEASURES******************



SPILL OR LEAK PROCEDURES: Evacuate and ventilate spill area. Dike spill to prevent entry

 into water system. Wear full protective equipment, including respiratory equipment during

 clean-up (see Employee Protection Recommendations).

 MAJOR SPILL: Call PRECISION CONVERTING at (713) 934-1650. If transportation spill, call

    CHEMTREC at 800-424-9300. If temporary control of isocyanate vapor is required, a blanket

    of protection foam (available at most fire departments) may be placed over the spill. Large

    quantities may be pumped into closed, but not sealed container for disposal.

 MINOR SPILL: Absorb isocyanates with sawdust or other absorbents. Shovel into suitable

    unsealed containers; transport to well ventilated area (outside) and treat with neutralizing

    solution: mixture of water (80%) with non-ionic surfactant Tergitol TMN-10 (20%); or

Elastomer Series (Component A)                                             Page 4 of 9

MSDS 12/98



(continued)



   water (90%), concentrated ammonia (3-8%) and detergent (2%). Add about 10 parts of

   neutralizer per part of isocyanate with mixing. Allow to stand uncovered for 48 hours to let

   CO2 escape.

CLEAN UP: Decontaminate floor with decontamination solution letting stand for at least 15

 minutes.



***********************SECTION VII ?HANDLING AND STORAGE************************



STORAGE TEMPERATURE (min./max.): 64 F (18 C)/86 F (30 C)

SHELF LIFE: 6 months

SPECIAL SENSITIVITY: If container is exposed to high heat, 400 F (204 C) it can be pressurized

 and possible rupture. MDI reacts slowly with water to form CO2 gas. This gas can cause

 sealed containers to expand and possibly rupture.

HANDLING/STORAGE PRECAUTIONS: Store in tightly closed containers to prevent moisture

 contamination. Do not reseal if contamination is suspected. Avoid contact with skin and eyes.

 Do not breathe aerosols or vapors. Warning properties (irritation of the eyes, nose and throat

 or odor) are not adequate to prevent chronic overexposure from inhalation. This material can

 produce asthmatic sensitization upon either single inhalation exposure to a relatively high

 concentration or upon repeated inhalation exposure to lower concentrations. Exposure to

 vapors of heated MDI can be extremely dangerous. Employee education and training in the

 safe use and handling of this compound are required under the OSHA Hazard Communication

 Standard.



************************SECTION VIII ?PERSONAL PROTECTION**********************



EYE PROTECTION REQUIREMENTS: Liquid chemical goggles. Vapor resistant goggles should

 be worn when contact lenses are in use. In a splash hazard environment chemical goggles

 should be used in combination with a full-face shield.

SKIN PROTECTION REQUIREMENTS: Permeation resistant gloves (butyl rubber, nitrile rubber,

 and polyvinyl alcohol). However, please note that PVA degrades in water. Cover as much of

 the exposed skin area as possible with appropriate clothing. If skin creams are used, keep

 area covered by the cream to a minimum.

VENTILATION REQUIREMENTS: Local exhaust should be used to maintain levels below the

 TLV whenever MDI is processed, heated or spray applied. Standard reference sources

 regarding industrial ventilation (i.e., ACGIH Industrial Ventilation) should be consulted for

 guidance about adequate ventilation.

RESPIRATOR REQUIREMENTS: Concentrations greater than the TLV can occur when MDI is

 sprayed, heated or used in a poorly ventilated area. In such cases, or whenever

 concentrations of MDI exceed the TLV or are not known, respiratory protection must be worn.

 A supplied air respirator (either positive pressure or continuous flow type) is required. In an

 emergency situation, a self-contained breathing apparatus may be used. MDI has poor

 warning properties, since the concentration at which MDI can be smelled is substantially higher

 than the maximum exposure limit. Observe OSHA regulations for respirator use

 (29 CFR 1910.134).

MONITORING: Isocyanate exposure levels must be monitored. Monitoring of airborne

 isocyanates in the breathing zone of individuals should become part of the overall employee

 exposure characterization program. Monitoring techniques have been developed by NIOSH

 and OSHA. Upon request, PRECISION CONVERTING can make available methods, which

 are modifications of these NIOSH, and OSHA methods.

Elastomer Series (Component A)                                           Page 5 of 9

MSDS 12/98



(continued)



MEDICAL SURVEILLANCE: Medical supervision of all employees who handle or come in contact

 with isocyanates is recommended. These should include pre-employment and periodic

 medical. examinations with pulmonary function tests (FEC, FVC as a minimum). Persons with

 asthmatic-type conditions, chronic bronchitis, other chronic respiratory diseases or recurrent

 skin eczema or sensitization should be excluded from working with isocyanates. Once a

 person is diagnosed as sensitized to an isocyanate, no further exposure should be permitted

ADDITIONAL PROTECTIVE MEASURES: Safety showers and eyewash stations should be

 available. Educate and train employees in safe use of product. Follow all label instructions.

 For additional information, contact PRECISION CONVERTING



****************SECTION IX ?PHYSICAL AND CHEMICAL PROPERTIES***************



PHYSICAL FORM: Liquid

COLOR: Clear

ODOR: Slightly musty odor

ODOR THRESHOLD: Not established

pH: Not established

BOILING POINT: 406 F (208 C) at 5 mm Hg for MDI

MELTING/FREEZING POINT: Below 32 F (0 C) for MDI

VISCOSITY: 1100 cps @ 77 F (25 C)

SOLUBILITY IN WATER: Not soluble. Reacts slowly with water to liberate CO2 gases.

SPECIFIC GRAVITY: 1.24 @ 77 F (25 C)

BULK DENSITY: 9 lbs./gal.

% VOLATILE BY VOLUME: Negligible

VAPOR PRESSURE: Less than 10-5 mm Hg at 77 F (25 C) for MDI

VAPOR DENSITY: 8.5 (MDI) (Air ?1)



**********************SECTION X ?STABILITY AND REACTIVITY************************



STABILITY: This is a stable material

HAZARDOUS POLYMERIZATION: May occur; contact with moisture, other materials, which

  react with isocyanates, or temperatures about 400 F (204 C), may cause polymerization.

INCOMPATIBILITIES: Water, amines, strong bases, alcohol's will cause some corrosion to

  copper alloys and aluminum.

INSTABILITY CONDITIONS: Contamination with water and high temperatures above 400 F

  (204 C).

DECOMPOSITION PRODUCTS: By high heat and fire; carbon monoxide, oxides of nitrogen,

  traces of HCN, MDI vapors or aerosols.



********************SECTION XI ?TOXICOLOGICAL INFORMATION*********************



TOXICITY DATA FOR: Diphenylmethane Diisocyanate (Monomeric and Polymeric)

 ACUTE TOXICITY:

   ORAL LD50: Greater than 15,800 mg/kg (rat)

   DERMAL LD50: Greater than 5,010 but less than 7,940 mg/kg (rabbit)

   INHALATION LC50: The 4-hour LC50 for polymeric MDI in rats ranges from 370 to 490

     mg/m3. The LC50 for monomeric MDI was estimated to be between 172 and 187 mg/m3.

   EYE EFFECTS: Slight to moderate irritation.

   SKIN EFFECTS: Slight to moderate irritation.

Elastomer Series (Component A)                                             Page 6 of 9

MSDS 12/98



(continued)



 SENSITIZATION: MDI has been shown to produce dermal sensitization in laboratory animals.

    Evidence of respiratory sensitization has also been observed in guinea pigs. In addition,

    there is some evidence suggestive of cross-sensitization between different types of

    diisocyanates.

 CHRONIC TOXICITY: In a combined chronic inhalation toxicity/oncogenicity study, rats were

    exposed to an aerosol of polymeric MDI for 6 hours per day, 5 days per week for one or two

    years. The exposure concentrations were 0, 0.2, 1.0 and 6.0 mg/m3. Microscopic

    examination of tissues revealed the effects of irritation to the nasal cavity and lungs in

    animals exposed to 1.0 and 6.0 mg/m3. The No Observable Effect Level (NOEL) was

    0.2 mg/m3.

CARCINOGENICITY: In the study described above (CHRONIC TOXICITY), the occurrence of

 pulmonary adenomas and a single pulmonary adenocarcinoma was considered to be related to

 MDI. These tumors were observed only in rats exposed to the high concentration of 6.0

 mg/m3.

MUTAGENICITY: Positive (Salmonella microsome test with metabolic activation; cell

 transformation assay) as well as negative (mouse lymphoma specific locus mutation test with or

 without metabolic activation) results have been observed "in vitro". However, MDI was negative

 in an "in vivo" (mouse micronucleus) assay.

DEVELOPMENTAL TOXICITY: Rats were exposed to polymeric MDI at air concentrations of 0, 1,

 4 and 12 mg/m3 during days 6 ?15 of gestation. Maternal Toxicity (including mortality) was

 observed at the highest concentration of 12 mg/m3 accompanied by embryo and fetal toxicity.

 However, no eratogenic effects were observed even at this lethal concentration.



**********************SECTION XII ?ECOLOGICAL INFORMATION*********************



ECOLOGY DATA FOR: Diphenylmethane Diisocyanate (Monomeric and Polymeric)

AQUATIC TOXICITY: LC50 ?24 hours (static): Greater than 500 mg/liter for Daphnia magna,

 Limnea Stagnalis, and Zebra fish (Brachydanio rerio) for both polymetic and monomeric MDI.



*********************SECTION XIII ?DISPOSAL CONSIDERATIONS********************



WASTE DISPOSAL METHOD: Waste must be disposed of in accordance with federal, state and

 local environmental control regulations. Incineration is the preferred method.

EMPTY CONTAINER PRECAUTIONS: Empty containers must be handled with care due to

 product residue. Decontaminate containers prior to disposal. Empty decontaminated

 containers should be crushed to prevent reuse. DO NOT HEAT OR CUT EMPTY CONTAINER

 WITH ELECTRIC OR GAS TORCH (see Fire Fighting Measures and Stability & Reactivity).

 Gases may be highly toxic.

TRANSPORTATION EMERGENCIES: Bayer requires that CHEMTREC be immediately notified

 at 800-424-9300 when this product is unintentionally released from its container during its

 course of distribution, regardless of the amount released. Distribution includes transportation,

 storage incidental to transportation, loading and unloading. Such notification must be

 immediate and made by the person having knowledge of the release.



******************SECTION XIV ?TRANSPORTATION INFORMATION******************



TECHNICAL SHIPPING NAME: Methylene diphenyl diisocyanate



        DOT (DOMESTIC SURFACE)

Elastomer Series (Component A)                                                 Page 7 of 9

MSDS 12/98



(continued)



PROPER SHIPPING NAME: Chemicals, N.O.I. (isocyanate, NMFC 60,000). Nonregulated

HAZARD CLASS OR DIVISION: None

UN/NA NUMBER: None

FREIGHT CLASS: 55

PACKAGING GROUP: None

HAZARDOUS SUBSTANCE: Methylene Diphenyl Diisocyanate

DOT PRODUCT RQ lbs.: 5000 lbs.

HAZARD PANEL(s): None

HAZARD PLACARD(s): None



?    WHEN IN INDIVIDUAL CONTAINERS OF LESS THAN THE PRODUCT RQ, THIS

      MATERIAL SHIPS AS NON-REGULATED.



          IMO / IMDG CODE (OCEAN)



      HAZARD CLASS DIVISION NUMBER: Non-regulated

         ICAO / IATA (AIR)



      HAZARD CLASS DIVISION NUMBER: Non-regulated



*********************SECTION XV ?REGULATORY INFORMATION**********************



OSHA STATUS: This product is hazardous under the criteria of the Federal OSHA Hazard

  Communication Standard 29 CFR 1910.1200.

TSCA STATUS: On TSCA Inventory

CERCLA REPORTABLE QUANTITY: 5000 lbs. for 4,4'-Diphenylmethane Diisocyanate,

  CAS # 101-68-8.

SARA TITLE III:

  SECTION 302 EXTREMELY HAZARDOUS SUBSTANCES: None

  SECTION 311/312 HAZARD CATEGORIES: Immediate Health Hazard; Delayed Health

   Hazard; Reactive Hazard

  SECTION 313 TOXIC CHEMICALS: Polymeric Diphenylmethane Diisocyanate,

   CAS # 9016-87-9, 100%; Contained in this polymeric MDI product is 4,4'-Diphenylmethane

   Diisocyanate, CAS # 101-68-8, Upper Bound 45%.

  RCRA STATUS: MDI is not listed as a hazardous waste. To the best of our knowledge, MDI

   does not meet the criteria of a hazardous waste if discarded in its purchased form. However,

   under RCRA, it is the responsibility of the user of products to determine, at the time of

   disposal, whether a product meets any of the criteria for a hazardous waste. This is because

   product uses, transformations, mixtures, processes, etc., may render the resulting material

   hazardous, under the criteria of ignitability, corrosivity, reactivity and toxicity characteristics

   under the new Toxicity Characteristics Leaching Procedure (TCLP) 40 Code of Federal

   Regulations 261.20-24.



    The following chemicals are specifically listed by individual states; other product specific health

      and safety data in other sections of the MSDS may also be applicable for state requirements.

      For details on your regulatory requirements you should contact the appropriate agency in

      your state.

Elastomer Series (Component A)                                            Page 8 of 9

MSDS 12/98



(continued)



COMPONENT NAME

  CAS NUMBER                 CONCENTRATION            STATE CODE



4,4'-Diphenylmethane                                    PA1, FL, IL, MA,

 Diisocyanate (MDI)                                     NJ1, NJ4, CN2

   CAS # 101-68-8             Upper Bound 45%



Higher Oligomers of MDI                                    PA3, NJ4

 CAS # 9016-87-9                  45-55%



Diphenylmethane                                            PA3, NJ4

 Diisocyanate (MDI)

   CAS # 26447-40-5                 1-10%



Phenyl isocyanate                                              MA

 CAS # 103-71-9                   Trace - ppm



* FL      Florida Substance List

  IL      Illinois Toxic Substance List

  MA      Massachusetts Hazardous Substance List

  NJ1     New Jersey Hazardous Substance List

  NJ4     New Jersey Other ?included in 5 predominant ingredients > 1%

  PA1     Pennsylvania Hazardous Substance List

  PA3     Pennsylvania Non-hazardous present at 3% or greater

  RI      Rhode Island List of Designated Substances

  CN2     Canada WHMIS Ingredient Disclosure List over 0.1%



  ***********************SECTION XVI ?OTHER INFORMATION**************************



  NFPA 704M RATINGS: Health         Flammability        Reactivity         Other

                          3                1                      1

  0 ?Insignificant

  1 ?Slight

  2 ?Moderate

  3 ?High

  4 ?Extreme



 HMIS RATINGS: Health           Flammability          Reactivity          Other

                    3*                 1                       1

 0 ?Minimal

 1 ?Slight

 2 ?Moderate

 3 ?Serious

 4 ?Severe

?Chronic Health Hazard



PREPARED BY: C. Boddie

APPROVAL DATE: 12/98

SUPERCEDES DATE: 06/97

Elastomer Series (Component A)                                               Page 9 of 9

MSDS 12/98



(continued)







This information is furnished without warranty, expressed or implied, except that it is accurate to

  the best knowledge of PRECISION CONVERTING The data on this sheet relates only to the

  specific material designated herein. PRECISION CONVERTING assumes no legal

  responsibility for use or reliance upon this data.