SAPTEX

POLYURTHANE – POLYISOCYANURATE

SYSTEM – CHEMICALS

For

A- INJECTION PURPOSES; in multifarious densities:

I. Sandwich Panels.

II. Refrigerator of Freezer Industries.

III. Refrigerated Trucks.

IV. Water Heaters Insulation

V. Metal Doors Insulation.

VI. Pipe Duct Insulation.

B- On – SITE SPRAY APPLICATIONS:

Spray – on foam for roofs, chemical tanks & vessels, in various densities. The system is suitable for the heat insulation and sealing.

SYSTEM COMPONENTS

PUR/PIR, System Chemicals are composed of two components.

COMPONENT-A:

Consists of polyol - blends

Customized for multifarious – purposes, in wide range of densities, with different rise profiles, according to the end uses and requirements of the customers. The parameters are adjusted according to prevailing specs, and final activity. The blends are normally supplied, in blue – colored iyon drums of net – weight 220 kg.

COMPONENT – B

Component – B: is MDI/ISO (Diphenyl – Methane – Disso – cymatia), supplied in iyon drums of 250 kg net weight. It is dark brown liquid at ambient temperatures. It is of two types:

(i) Diisocyanate – Diphenylme thane composition containing some higher functionality isocyanurate, which is about 2.6 – 2.7 and viscosity (@2Tc) 150 – 250 mpas

(ii) High functionality (2.9 – 3.0) and high viscosity (at 25 c^o = 350 – 700 m Pa.s) isoeyanate.

SYSTEMS – PHYSICAL PROPERTIES

REACTION PROFILES

&

PRODUCT PROPERTIES

SAPTEX-POLYOLS (GENERAL)

FOR

INJECTION APPLICATIONS

These special polyol are blended for the production of rigid foams for injection purposes. These are classified according to DIN 4102 Part I as 1121113.

The general POLYOLS can be processed on all commercially available equipments and provided in various versions, tailored to the customer's individual requirements.

TYPICAL PROPERTIES

1.	Physical state:	liquid
2.	Colour:	amber
3.	Odour:	faint
4.	Solidification temp:	<0°C
5.	Flash point:	>150°C
6.	Vapour pressure (20 ° C)	<l0 mbar
7.	Sp. Gr. (25 ° C)	1016 (± 0.04)
8.	Solubility in water	sparingly soluble
9.	Viscosity at (25 ° C)	400±50cps
10.	Shelf life	6 months
11.	Storage temp	+10 to 23°C
12.	Fire classification (I)IN 4102)	B2/B3

STORAGE: Many polyol blends are hygroscopic and care should he taken to provide minimum exposure to atmosphere by keeping the containers properly sealed when not in use.

PRECAUTIONS: Blended polyol mixtures contain tertiary amines / and or organic metallic compound as catalysts I additives, therefore contact with the skin or eves may cause irritation & should he avoided.

However the polyols used, in general belong to a class of higher molecular weight compounds, which under normal circumstances of handling & use, do not present any significant hazard to users.

In all cases the normal standards of industrial hygiene, should be observed when handling these materials

SAPTEX-POLYOLS (GENERAL)

FOR

SPRAY APPLIED APPLICATIONS

These special polyols are blended for the production of rigid foams for spray purposes. ‘l’hese are classified according to DIN 4102 Part I as B2/B3.

I the spray POLY OLS can be processed on all commercially available equipments and provided in various versions, tailored to the customers individual requirements.

TYPICAL PROPERTIES

1.	Physical state	liquid
2.	Colour	amber
3.	Odour	faint
4.	Solidification ternp	<0°C
5.	Flash point	>150°C
6.	Vapour pressure (20°C)	<l0 mbar
7.	Sp. Cr. (25°C)	102 (± 0.4)
8.	Solubility in water	sparingly soluble
9.	Viscosity at (25 °C)	200 ± 5OCPs
10.	Shelf life	6 months
11.	Storage temp.	+10 to 23°C
12.	F’ire classification (I)IN 4102)	B2/B3

STORAGE: Many polyol blends are hygroscopic and care should be taken to provide minimum exposure to atmosphere by keeping the containers properly sealed when not in use.

PRECAUTIONS: Blended polyol mixtures contain tertiary amines / and or organic metallic compound as catalysts I additives, therefore contact with the skin or eyes may cause irritation & should be avoided.

However, the polyols used, in general belong to a class of higher molecular weight compounds, which under normal circumstances of handling & use, do not present any significant hazard to users.

In all cases the normal standards of industrial hygiene, should be observed when handling these materials.

SAPTEX – MDI/N

DIPHENYL-METHANE-DIISOCYANATE

FOR SPRAY & INJECTION

SAPTEX – MDI/N, is Diphenyl-Methane-Diisocyanate based composition. It is widely used for the production of rigid polyurethane, heat insulting products. Its flow ability is excellent, due to its unique compositional structure.

TYPICAL PROPERTIES

1. COLOUR & APPEARANCE = Dark brown liquid

2. _NCO CONTENT = 30 to 32%

3. VISCOSITY (25 …C) = 200 – 50 mps

4. SPECIFIC GRAVITY (25^OC) = 1.22 (+0.04)

5. PHENYL ISOCYANATE CONTENT = <50 ppm

6. SPECIFC HEAT = 1.51 KJ/Kg.K

7. ACID CONTENT (AS HCI) = < 0.05 %

8. FLASH POINT = over 200 ^oC

9. FIRE POINT = Over 200 ^oC

10. FREEZING POINT = Below 10^c

11. VAPOUR DENSITY = 8.5

12. VAPOUR PRESSURE (40^OC) = Below 10-4mbar at 25 …C

13. TLV = 0.2 mg/m³

14. FUNCTIONALITY = 2.6 to 2.7

STORAGE RECOMMENDATIONS:

SAPTEX – MDI/N is a reactive chemical and can reacts with atmospheric moistures, with the formation of insoluble Urea’s and Carbon Dioxide gas, resulting in the pressure build-up in closed containers and viscosity increase of the product. Therefore, the containers must be absolutely dry and carefully air-tight sealed.

The ideal storage temperature is 10^oC to 20 ^oC, but storage is also possible in the range of 10 ^oC to 30 ^oC.

Even under appropriate storage conditions, the viscosity and solid contents may increase slightly with time, but have no effect on product quality.

Storage stability is for one year, if stored in moisture tight drums.

Saptex - MDI / HF

DIPHENYL-METHANE-DIISOCYANATE

(high Functionality & Viscosity )

For

Continuous PUR Laminated Panels

Saptex - MIDI/HF is a high functionality and high viscosity isoeyanate, with functionality 2.9 — 3.0 . It is particularly used for continuous production of polyisoeyanurate and slabs polyurethane Continuous laminated boards sandwich panels lt can improve cell homogeneity and dimensional stability of foams, in addition to enhanced mechanical properties. especially, compressive strength, in the direction of vertical to rise.

TYPICAL PROPERTIES

I.	Colour & Appearance	Dark brown liquid.
2.	Isocynate Content	30.0 to 32.0%
3.	Viscosity ( 25° C)	350 – 700 mpa.s
4.	Specific Gravity (25°C)	1.23 (+2)
5.	Phenyl Isocynate Content	<50 ppm
6.	Acid Content (As HCI)	<0.05 %
7.	Flash Point	230° C
8.	Fire Point	245° C
9.	Freezing Point	Below 10° C
10.	Specific heat	1.51 KJ / Kg.K
11.	Vapour Density	8.5
12.	Vapour Pressure (40° C)	<10 -4 mm Hg

STORAGE RECOMMENDATIONS:

SAPTEX - MDI/HF is a reactive chemical and can reacts With atmospheric moistures, With the formation of insoluble Urea's and Carbon Dioxide gas, resulting in the pressure build-up in closed containers and viscosity increase of the product. Therefore, the containers must be absolutely dry and carefully airtight sealed.

The ideal storage temperature is 10° C to 20° C, but storage is also possible in the range of 10° C to 30° C.

Even under appropriate storage conditions, the viscosity and solid contents may increase slightly with time, but have no effect on product quality. Storage stability is one year, if stored in moisture tight drums.

SAPTEX PUR SYSTEM CHEMICALS FOR INJECTION

SAPTEX – POLYOL SAPTEX MDI/ISO

Viscosity (20 … C) 400 cps (-50) 200 cps (-50)

Sp. Gr (20 C^o) 1.2 gm/cc (-0.04) 1.22 gm/cc (-0.04)

Mixing ratio 100 pbw 110 – 120 pbw

Mixing temp : 20-23 ^oC

Cream time : 20 Sec.

Gel time : 120 Sec.

Tack free time : 250 Sec.

Rise time : 180 Sec.

NOTE: Reaction profile & densities are adjustable according to customers requirements.

JIG DWELL TIME:

Many factors, like temperature of the facings, chemicals, etc. have considerable effects, on the press injection time; however, the most critical factor affecting the dwell time is the panel thickness. The approximate guide times for various panel thick nesses are as under:

Panel Thickness Dwell Time

50 mm 15 minutes

100 mm 30 minutes

150 mm 40 minutes

180 mm 50 minutes

200 mm 60 minutes

SAPTEX ND SPRAY – APPLIED POLYUREIHANE ROOF INSULATION

SAPTEX ND- Spray- Applied Polyurethane Root Insulation System, consists of rigid, cellular, closed-cell, thermal insulation polyurethane foam, applied in various thicknesses according to the required thermal conductance thermal resistance value.

TA e polyurethane system chemicals are blended, at a most modern and state of art system house, equipped with all the facilities. To achieve the required parameters, the plant is air conditioned, as well as equipped with controls for low and high temperatures.

The high quality products meet the specifications of National, Regional and International, rigid, cellular, thermal insulation polyurethane standards. These include:

ASTM C-1013, ASTM C-591, HH-1-1972, ASTM E-84, DIN 4102, BS 476, JIS, SASO,GULF, ISO, etc.

NO.	CHARACIERISTICS	Values		Test Method
1.	NOMINAL DENSITY( kg/m3)	32-35	40-45	ASTM D-1622
2.	COMPRESSIVE STRENGTH (kg/cm2)	1.50+ 0.2	2.10 + 0.2	ASTM D-1621
3.	THERMAL CONDUCTIVITY(w/mk) (Aged Value)	0.023	0.023	ASTM C-177
4.	CLOSED CELL content (%)	90 to 95	90-95	ASTM D-2856
5.	WATER VAPOUR PERMEABILITY (perm-inch)	1.5	1.4	ASTM C-355
6.	WATER ABSORPTION(%by volume)	1.0	1.0	ASTM D-2842
7.	CONTINUOUS WORKING TEMP.(C°)	110^oC	110^oC	THERMOMETER
8.	COEFFICIENT OF LINEAR THERMAL EXPANSION(m/mk)	7 x 10^-10	7 x 10^-10	B S-4370
9.	DIMENSIONAL STABILITY (%-Linear Change) a) -20^o C For 24 HRS b) 105 + 5^oC For 25 HRS c) 70 + 3^o C & 95 + 5%R.H	Negligible 1.5 2.0	Negligible 1.3 1.8	ASTM D-2126
10.	Burning characteristics (classification)	B2/B3	B2/B3	DIN 4102
	Flammability (Rating) (a) – Flame (b) – Smoke Density	<75 <450	<75 <450	ASTM E-84
	Rise Profile Cream Time: Gel Time: Tack Free Time:	4-5 sec. 6-8 sec. 18-20 sec.
	Maxing Temperature: Mixing Ratio:	20-23 degree C 100 Pbw	ISO 100 Pbw

SAPTEX-HD-SPRAY – APPLIED POLYURETHANE ROOF INSULATION

SAPTEX-HD- Spray- Applied Polyurethane Roof Insulation System, consists of rigid, cellular, closed-cell, thermal insulation high density polyurethane foam, applied in various thicknesses, according to the required thermal conductance/ thermal resistance value.

The polyurethane system chemicals are blended, at a most modern and state of art system house, equipped with all the facilities. To achieve the required parameters, the plant is air conditioned as well as equipped with controls for low and high temperatures.

The high quality products meet the specifications of National. Regional and International, rigid, cellular, thermal insulation polyurethane standards. These include:

ASTM C-1013, ASTM C-591, 1111-1-1972, ASTM E-84, DIN 4102, BS 476, JIS, SASO. GULF, LSO, etc.

TYPICAL PROPERTIES

NO	CHARCTERISTICS	VALUES		TEST METHOD
1.	NOMINAL DENSITY (Kg/m3)	50	60	ASTM D-1622
2.	COMPRESSIVE STRENGTH (KG/CM2) (Parallel Rise)	2.75 (+0.25	5.0 (+0.5)	ASTM D-1621
3.	TENSILE STRENGTH (KG/CM2)	4.0 (+0.5)	5.0(+0.5)	ASTM C-209
4.	FLEXURAL STRENGTH (KG/CM2)	5.0 (+0.5)	6.0(+0.5)	ASTM C-203
5.	SHEAR STRENCTH (KG/CM2)2.	2.0(+0.2)	2.75(+0.2)	ASTM C-273
6.	THERMAL CONDUCTIVITY (w/mk) (Aged Value)	0.023	0.024	ASTM C-177
7.	CLOSED CELL CONTENT (%)	90 – 95	90 – 95	ASTM C-2856
8.	WATER VAPOUR PERMEABILITY (PERM-INCH)	1.0	0.5	ASTM C-355
9.	WATER ABSORPTION (%BY VOLUME)	1.0	0.8	ASTM D-2842
10.	CONTINUOUS WORKING TEMP. (C°)	110 ^oC	110^o C	Thermometer
11.	COEFFICIENT OF LINEAR THERMAL EXPANSION (M/MK)	7x10^-5	7x10^-5	B S-4370
12.	DIMENSIONAL STABILITY (%-LINEAR CHANGE) (a) –20° … C FOR 24 ARS. (b) 105 – 5° … C FOR 24 HRS. (c) 70 + P …C & 95 – 5% R.H	Negligible 1.0 1.5	Negligible 1.3 1.3	ASTM D-2126
13.	BURNING CHARACTERISTICS (CLASSIFICATION	B2/B3	B2/B3	DIN-4102
14.	FLAMMABILITY (RATING) (a) FLAME (b) SMOKE DENSITY	< 75 < 450	< 75 < 450	ASTM E-84

NOTE: Mixing temperature, mixing ratio rise profile are same given in the ND-Spray Polyurethane Roof Insulation.

HIGH DENSITY POLYOL-BLEND FOR INJECTION

WOOD Imitation

CENERAL:

This is a special polyol blend for Rigid Polyurethane Foam and is used as wood imitation. The molded density can be achieved as high as 250 % (±50) Kg/m3.

This special blend service for the Molding of furniture parts, housing, casings,

Etc. etc.

PHYSICAL PROPERTIES:

Physical State	Liquid
Colour	Amber
Odour	Faint
Solidification Temp.	<°0C
Flash Point	150 C
Vapour Pressure (20 °C)	<10 mbar
Sp.Gr.(25°C)	1.1
Solubility In Water	Sparingly Soluble
Viscosity (25°C)	100± 2400 cps.
Shelf Life	6 Months
Fire Classification	B2/B3

STORAGE: Minimum exposure to atmospheric moisture, by keeping the temperature between 10 °C to 25 °C.

REACTION PROFILE & DENSITY:

Cream : 45-50 sec.

Time : :90-95 sec.

lack Free density :145-150 Kg/m3

MIXING RATIO & TEMPERTURE:

Mixing Temp. =45+1°C

Polyol (B-Component ) =100 pbw

MDI (A-Component ) =110 pbw

PRECAUTIONS: Blended polyol mixtures contain tertiary amines/ and or organic metallic compounds as catalysts / additives, therefore contact with the skin or eyes may cause irritation and should be avoided. However there is no significant hazard to users and normal standards of industrial hygiene, be observed, when handling these material.

PUR-INJECTION SYSTEM TYPICAL PROPERTIES
Property		TEST METHOD	UNIT	CHARACTERIS TIES
Nominal Density		ASTM D 1622	Kg/m^3 IO/inh^3	35 2 2	40 2 5	50 3 1	60 3 8	80 5 0	100 6.3	120 7.5
Compressive Strength at 10% dellection	Parallel to nse	ASTM D1621	Kn/m^2 IO/inh^2	190+50 28+6	260+50 38+7	350+60 51+9	450+100 65+15	750+100 109+15	1100+100 160+22	1600+200 233+29
	Perpendi- cular to nse	ASTM D1621	KN/m^2 IO/inh^2	150+40 22+6	200+50 29+7	300+50 44+9	400+100 58+15	600+100 87+15	950+150 135+22	1200+200 174+29
Thermal Conductivity at 24 ^oC mean temp (aged, value) max		ASTM C177	W/mk	0.023	0.023	0.023	0.023	0.024	0.025	0.028
			BTU-inn^2bn ^oF	0.16	0.16	0.16	0.16	0.167	0.18	0.20
Water Vapur Permeability		ASTM C355	PERM-IN	15	15	15	05	04	0.4	0.4
Water Absorption		ASTM D2842	%by volume	1	1	1	1	08	0.7	0.7
Continous working temperature			^oC	110	110	110	140	140	140	140
			^oF	230	230	230	284	284	284	284
Dmee Stability (MAX) beee		ASTM D2126 Method ^oC	Percent linear change	15	15	15	08	07	0.6	0.6
				2	2	2	13	12	1.0	1.0
Coemicient of inear thermal expansion		BS 4370	m/mk	7x10^5	7x10^5	7x10^5	7x10^5	7x10^5	7x10^5	7x10^5
Flammability class		DIN 4102		B2B3	B2B3	B2B3	B2B3	B2B3	B2/133	B2/133
Closed cell content		ASTM D2856		90.95	90.95	90.95	90.95	90.95	90-95	90-95

NOTES:

1- PUR- Foams are vermin and rodent control and inert to most of the chemicals.

2- Higher and lower densities can be provided on request.

3- Numerical fire rating or fire classifications are not intended to rellect hazards presented by this material under actual fire conditions.

4- The values given against the above properties are typical and are not meant to imply specification limits, while these should not be used for this purpose without reference to SAPTEX

5- These leaflets are hereby excluded from any contractual legal bindings.

6- Recommendation for use should be verified as to suitability and compliance with actual requirements, specifications and any applicable laws and regulations.

7- Vales can be adjusted without prior notification.

1 – Material Safety   Data Sheets

a- Polyol blend

b- MDI/ISO

2 – Product safety data sheet.

3 – Health and safety precautions

D-TOXICOLOGICAL INFORMATION:

I. INGESTION : LD 50 (oral, rat)

2. EYE CONTACT :May cause slight transient eye irritation.

3. CORNEAL INJURY : Unlikely.

4. SKIN CONTACT : Essentially non — irritating to skin. Prolonged contact can result in irritation of the skin.

5. DERMA : LD 50.

6. INHALATION :Not expected to present a significant inhalation hazard under normal conditions of use.

E-TRANSPORT CLASSIFICATION:

Non hazardous goods according to transport classification.

F-FURTHER MEDICAL TREATMENT:

If required consult doctor and accompany patient with this urethane information document for treatment.

G-STORAGE:

The materials are sensitive to humidity. Partially used drums should be tightly sealed to prevent the ingress of moistures. The preferable storage temperature is 15 to 25 C.

H-HANDLING:

During handling gloves and goggles should be worn.

Blended polyols mixtures contain tertiary amines / and or organic metallic compounds as catalyst I additives, therefore, contact with the skin or eyes may cause irritation and should be avoided.

However the polyol used, in general belongs to a class of higher molecular weight which under normal circumstances of handling and use, does not present any significant hazards to users.

In all cases the normal standards of industrial hygiene, should be observed when handling these materials.

MATRIAL SAFTY DATA SHEETS

SAPTEX-POLYOL

A- COMPONENT OF POLY URETHANE SYSTEM

1st- GENERAL:

1. Chemical Name :Polyethylene glycol, with additives

2. Trad Name : SAPTEX-A-Component.

3. CAS NO. : 25322-68-3.

2nd- CHARACTERISTIES:

1. STATE : Viscous liquid.

2. COLOUR : Cream.

3. ODOUR : Usually Faint.

4. PH : 4.5 – 7.5.

5. SOLIDIFICATION TEMP. : < 01° C.

6. FLASH POINT : > 180° C.

7. FLAMMABILITY LIMIT : Not applicable.

8. EXPLOSIVE PROPERTIES : Not applicable.

9. OXIDIZING PROPERTIES : Not applicable.

10. VAPOUR PRESSURE : < 10 mbar at 20° C. (Negligible)

11. SPECIFIC GRAVITY : 1.0 to 1.2 at 20° C.

12. SOLUBILITY IN WATER :  sparingly soluble.

13. VISCOSITY : 200 + 50 CPS.

3rd- STABILITY AND REACTIVITY:

1. stable under recommended storage conditions.

2. Under high heating, the vapours mixed with air may take fire, therefore high temp heating must be avoided.

3. Materials to avoid are, acids, alalies, oxidizing agents.

4. Under normal industrial uses, hazardous decomposition products are unlikely.

Material Safety data sheet

SAPTEX MDI/ISO

B- Compnent of polyurethane system

1st. – Physical and chemical properties

1 – Name : Polymeric dephenylmethanediisocyanate.

2 – Alternate name : Polymeric MDI

3 – Trade name : SAPTEX –B-Component

4 – CASNO. :9016-87-9.

5 – UN NO. :2489

6- CHEMICAL FAMILY :Diisocynate.

7- State : Viscous liquid

8- APPEARANCE : Dark brown.

9 – ODOUR : Slight.

10 – Flash point : >200 C.

11 – Fire Point : >200 C.

12 – Vapor density : 8.6

(AIR=1)

13 – Vapur Pressure : Below 10-4 mbar at 25C.

14 – Solubility (Water) : Reacts with water

15 - Solubility (Others) : Soluble in most organic sovents.

2st. STABILITY AND REACTIVITY:

1 - CHEMICAL STABILITY : Stable at room temperature.

2- CONDITIONS TO AVOID : Avoid high temp. & FreeLiflg.

3. INCOMPATIBILITY : This product will react with materials

containing active hydrogen, such water, alcohol, amine, bases & acids.

4. HAZARDOUS POLYMERIZATION : Polymerization may occur at elevated

temp. in the presence of alkalis, tertiary

amines and metal compounds.

5- FIRE AND EXPLOSION HAZARDS:

Containers may burst under intense heat, due to

reaction with water a hazardous build-up

of pressure could result if contaminated

containers are re-sealed.

5. EXITINGUISHING MEDEIN:

water, carbon diovide, dry chemicals,

or appropriate foam. If water is used,

very large quantities are required.

6. FIRE GIGHTING PROCEDURES:

as appropriate for surrounding

materials / equipment.

7. FIRE FICHTING PROTECTIVE EQUIPMENT:

Use self-contained breathing apparatus

and full protective clothing.

8. COMBUSTION PRODUETS:

CO, CO2 and negligible HCN.

3rd- FIRST AID MEASURE:

In case of accident, if you feel unwell, seek medical advice immediately.

1. Inhalation: Remove patient from exposure, keep warm and at rest, obtain medical attention.

2. Skin contact: Remove contaminated clothing. Immediately wash affected areas thoroughly with soap and water. Some organic-materials, such as corn-oil or propylene glycol are effective in decontamination MDI from the skin, when applied immediately. If irritation, redness, or a burning sensation develops & persists, obtain medical advice.

3. Eve contact: Immediately flush eyes with running water for a minimum period of 15 minutes. If irritation persists, obtain medical attention.

4. Ingestion: Do not induce vomiting. Provided the patient is conscious, wash out mouth, with water, then give 1 o 2 glasses of water to drink. Immediate medical attention required.

4th- PERSONAL PROTECTION:

1. for eye protection. Use safety goggles.

2. for skin protection, use rubber gloves and protective clothing.

3. when sprayed or heated without adequate ventilation, use approved air respirator.

5th- HANDLING AND STORAGE:

1. Avoid personal contact with the product or reaction mixture.

2. Keep containers properly sealed and when stored indoors, in a well ventilated area.

3. Storage temperature is 16 – 30° C (ideal).

HEALTH AND SAFETY

The knowledge, of the risk concerned and the adoption of suitable safety precautions can produce a high level of safety for mankind and environment, even when dangerous substances are involved.

This information sheet indicates the possible hazards involved in handling the Polyisocyanurate (FIR) and Polyurethane (FUR) finished closed-cell thermal insulation foams.

.4. HEALTH ASPECTS:

Properly manufactured rigid closed-cell thermal insulation PUR/PIR foams based on

Polyisocyanate constitute no hazard at all for the health.

B. RIGID FOAM DUST: (Normally in the Factory)

Sawing milling, and grinding are frequently used operations during the subsequent processing of PUR/PIR rigid foams. All of them tend to produce a considerable amount of dust.

For toxicologically inert fine dusts, the MAC- value is 8 mg!m3. This applies to dusts which are neither toxic nor cause a fibrous reaction in lung tissue.

To avoid exceeding this MAC-value, the following steps should be taken in plants where dusts from rigid foams are formed.

I) Suitable exhaust ventilation strong enough to carry away the dust arising from grinding and sawing operations, must be provided at the respective work place.

ii) Persons carrying out such work should, wherever possible, wear suitable face masks.

iii) The work place should be cleaned with a suitable vaccum cleaner at least once a day and, where large amounts of dust area formed more often. The settling of dust in dangerous amounts (dust layers of 1 mm) must be avoided.

C. FIRE SAFETY:

Rigid foams based on polyisocyanurate generally achieve a more favorable classification. Systems incorporating flame retardants may in some cases achieve the most favourable fire safety classification.

The combustion and pyrolysis products of rigid PUR & PIR have a distinctly less toxic effect than those of the natural materials spruce wood and cork.

However, it is not possible to eliminate completely the possibility of foams igniting themselves under unfavourable conditions. In rare cases if PUR and FIR rigid foams catch lire, than water, water foam and dry chemical powder (DIN 14406) have proved effective as extinguishing agents.

Conventional carbon dioxide-type extinguishers are not very effective.

During all extinguishing work, fresh air respirators with independent air supply should he worn.

D. SOLID WASTE DISPOSAL:

FUR and FIR waste which has completely cured can be disposed of on controlled land-fill sites or special waste dumps.

If the waste is to he burned in an incineration plant and in case of products containing halogen (e.g. RI I, TCA, methvlene chloride), scrubbing of the resultant flue gases is essential.