Hapco Inc. - liquid plastics and dispensing equipment manufacturer.

HAPCOAT SURFACE COAT SYSTEMS for a wide variety of applications

Durable Long lasting Tooling Chemical Resistant Coatings Industrial Coatings

Elastomeric

Hapcoat 562-564 Abrasion resistant, low durometer, surface coat

Hapcoat 597-599 Abrasion resistant, medium durometer, surface coat

Hapcoat 667-669 Abrasion resistant, high durometer, surface coat

Rigid

Hapcoat 3720 WHITE, MACHINABLE, WET PLASTER COMPATIBLE, SURFACE COAT

Hapcoat 3721 - Hapcoat 3721 LV WHITE, MACHINABLE, SURFACE COAT

Hapcoat 3726 ALUMINUM FILLED, HIGH TEMPERATURE GEL COAT

Hapcoat 3727 STEEL FILLED, HIGH STRENGTH, EASILY APPLIED SURFACE COAT

Quick Selector Chart:

HAPCOAT	*MIX RATIO: BY WEIGHT (PARTS B TO 100 PARTS A)	POT LIFE @ 25° C	CURE TIME	SERVICE TEMP (°F)	DESCRIPTION
RIGID SURFACE COAT SYSTEMS
3720	15	20-30 minutes Tack up time 45-60 minutes	Overnight @ room temp.	200	White, machinable. Used with plaster & hemp to make plastic faced/ plaster backed tools.
3721/7 **3721 LV/7	12	35-45 minutes Tack up time 50-70 minutes	Overnight @ room temp.	275	Two viscosities Three speeds 3721 Thick 3721 LV Medium
3721/41 **3721 LV/41	12	25-30 minutes Tack up time 45-60 minutes	Overnight @ room temp.	200
3721/44 **3721 LV/44	12	15-20 minutes Tack up time 30-45 minutes	Overnight @ room temp.	225
3726/7	12	30 minutes Tack up time 50-70 minutes	Overnight @ room temp. For best results, post cure 3 hrs @ 250° F	300	High performance, high thermal conductivity aluminum surface coat. Machinable.
3726/22	14	45-60 minutes Tack up time 60-90 minutes	24-36 hrs. @ room temp. Post cure 4-6 hrs. @ 225-250° F	340
*** 3726/30	15	60-90 minutes Tack up time 2-4 hours	4 hrs. @ 125-150° F + 4 hrs. @ 225-250° F	370
3726/41	12	25-30 minutes Tack up time 45-60 minutes	Overnight @ room temp.	185
3726/44	12	15-20 minutes Tack up time 30-45 minutes	Overnight @ room temp.	220
3727/7	5	20-40 minutes	Overnight @ room temp.	300	High performance High strength Steel Surface Coat Machinable
3727/22	6	2-4 hours	24-36 hrs. @ room temp. Post cure 4-6 hrs. @ 225-250° F	340
*** 3727/30	6	1-2 hours	4 hrs. @ 125-150° F + 4 hrs. @ 225-250° F	370
3727/41	5	20-30 minutes	Overnight @ room temp.	200
3727/44	9	60 minutes	Overnight @ room temp.	225
FLEXIBLE SURFACE COAT SYSTEMS
597-599	75	35-45 minutes Tack up time 45-60 minutes	24 hrs. @ room temp.	N/A	597 - White 599 - Grey 90-95 Shore A 667 - White 669 - Grey 65 Shore D
667-669	75	15-20 minutes Tack up time 20-30 minutes	16-24 hrs. @ room temp	N/A

* Parts B to 100 Parts A by weight.
The lower the ratio, the slower the cure, and the longer the working life.
The higher the ratio, the faster the cure, and the shorter the working life.
Starting point is the optimum ratio. See mix ratio range for other options

** Lower viscosity version

*** These hardeners must be cured at least 12 hrs. @ room temp. and 4-6 hrs. @ 130° F before demolding.
For models that will not take the final 195° F temp. demold only after the 130° F cycle.
Then bring the casting gradually up to the 195° Fcuring level, so as not to shock the system. No distortion should occur.